TSZ07 Tape Drive digi tal Technical Manual Order Number: EK–TSZ07–TM–003
TSZ07 Tape Drive Technical Manual Order Number: EK–TSZ07–TM–003 Prepared by Information Consulting and Design Digital Equipment Corporation • Merrimack, NH 03054
October 1992 The information in this document is subject to change without notice and should not be construed as a commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no responsibility for any errors that may appear in this document. No responsibility is assumed for the use or reliability of software on equipment that is not supplied by Digital Equipment Corporation or its affiliated companies. Restricted Rights: Use, duplication, or disclosure by the U.S.
Contents Preface xi Chapter 1 Introduction 1.1 1.2 1.3 1.4 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1 Physical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4 1.2.1 Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5 1.2.2 Rear View . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3 Maintenance 3.1 3.2 3.3 Tape Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1 Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2 Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3 Chapter 4 Troubleshooting 4.1 4.2 4.3 4.4 4.5 Power-on Diagnostics . .
Chapter 5 Removal/Replacement Procedures 5.1 5.2 5.3 5.4 Tools and Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4 Opening the Tape Drive to the Operator Access Position . . . . . . . . . . . . . . . . . . . . . . . . 5–4 5.2.1 Operator Access for the Rack-Mount Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4 5.2.2 Operator Access for the Table-Top Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4.30 5.4.31 5.4.32 5.4.33 5.4.34 5.4.35 Take-Up Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . Take-Up Motor (P/N 29-28469-01) . . . . . . . . . . . . Tape-In-Path Receiver (P/N 29-24093-00) . . . . . . . Tape-In-Path Transmitter (P/N 29-28483-01) . . . . Tension Sensor/Roller Guide 2 (P/N 29-28471-01) Top Cover (P/N 29-28462-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 2–3 2–4 3–1 3–2 4–1 5–1 5–2 5–3 5–4 5–5 5–6 5–7 5–8 5–9 5–10 5–11 5–12 5–13 5–14 5–15 5–16 5–17 5–18 5–19 5–20 5–21 5–22 5–23 5–24 5–25 5–26 5–27 5–28 5–29 5–30 5–31 5–32 5–33 5–34 5–35 5–36 Write-Enable Ring . . . . . . . . . . . . . . . . . . . . . . . . . Tape Reel Insertion . . . . . . . . . . . . . . . . . . . . . . . . TSZ07 Tape Path . . . . . . . . . . . . . . . . . . . . . . . . . . Location of Tape Path and Sensors . . . . . . . . . . . . Location of Air Filter . . . . . . . . . . . . . . . .
5–37 6–1 6–2 6–3 6–4 6–5 6–6 Removing the Top Cover . . . . . . . . . . . . . . . . Location of Interlock Switch . . . . . . . . . . . . . . Location of Skew Adjustment Screw . . . . . . . Skew Adjustment Waveform . . . . . . . . . . . . . Location of Supply Hub Screws . . . . . . . . . . . Aligning Motor Shaft with Supply Hub Dwell Adjusting the Take-Up Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B–5 B–6 B–7 B–8 Messages — Format and Codes SCSI Messages . . . . . . . . . . . . . Status Bytes . . . . . . . . . . . . . . . TSZ07 SCSI Commands . . . . . . . . . . . . . . . . . . ix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface This manual provides the information necessary to troubleshoot, and repair the TSZ07 Tape Drive. Programming information concerning the Small Computer System Interface (SCSI) used in the TSZ07 is also provided. Throughout this manual the TSZ07 Tape Drive will be referred to as either the TSZ07 or the drive. Structure of this Manual This manual is structured as follows: Chapter 1, Introduction — Provides a general, physical and functional description of the TSZ07 Tape Drive.
Related Documents The following are publications that support the TSZ07 Tape Drive: • TSZ07 Tape Drive Installation/Owner’s Manual (EK-TSZ07-IN) • TSZ07 Tape Drive Pocket Service Guide (EK-TSZ07-PG) • Small Computer System Interface: An Overview (EK-SCSIS-OV) • Small Computer System Interface: A Developer’s guide (EK-SCSIS-DK) • KZQSA Module Installation Guide (EK-KZQSA-IG) • H9642 Cabinet Maintenance Guide (EK-187AA-MG) • Field Maintenance Print Set (MP-03190-01) • MicroVAX Diagnostic Monit
FCC USER STATEMENT NOTICE: This equipment generates, uses, and may emit radio frequency. The equipment has been type tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of FCC rules, which are designed to provide reasonable protection against such radio frequency interference.
Für Bundesrepublik Deutschland end Berlin (West) For Federal Republic of Germany end West Berlin Pour la République féderale d’Allemagne et Berlin Ouest Hochfrequenzgerätezulassung end Betriebsgenehmigung Bescheinigung des Herstellers/Importeurs Hiermit wird bescheinigt, daß die Einrichtung in Übereinstimmung mit den Bestimmungen der DBP-Verfügung 523/1969, Amtsblatt 113/1969, end Grenzwertklasse "A" der VDE0871, funkentstört ist.
Chapter 1 Introduction This chapter provides general, physical, and functional descriptions of the TSZ07 Tape Drive and provides illustrations showing the major parts of the drive. 1.1 General Description The TSZ07 Tape Drive (shown in Figure 1–1) is a high-capacity streaming, nine-track, reelto-reel, half-inch magnetic tape drive unit with the capability of reading or writing in one of two selectable recording densities.
Figure 1–1: TSZ07 Tape Drive Versions 1–2 Introduction
There are four versions of the TSZ07 Tape Drive as described in Table 1–1. Table 1–1: TSZ07 Tape Drive Versions Description Order Number Rackmount unit without power cord. Customer must order the correct country kit to obtain power cord. Single-ended SCSI. TSZ07-AA Rackmount unit installed in a Digital 40-inch high H9642 style cabinet with an 874-D, 120 Volt, 24 Ampere, Filtered Power Controller. Singleended SCSI.
Communication to the drive is by way of the SCSI 2 interface at a synchronous rate of 4 Megabytes (1.5 Megabytes asynchronous) per second. The standard features of the drive include: • Mounting in standard 19-inch EIA/RETMA † rack (rackmount version) • Automatic tape loading and threading • Drive parameters configurable from the front panel • Eight-character alphanumeric display on the front panel • Automatic read/write retry • Autoranging ac power supply 1.
1.2.1 Front View Figure 1–2 shows the location of parts accessible from the front of the tape drive.
1.2.2 Rear View Figure 1–3 shows the location of the major parts at the rear of the drive.
1.2.3 Top View of Deck Plate Figure 1–4 shows the location of major parts at the top of the drive.
1.2.4 Bottom View of Deck Plate Figure 1–5 shows the location of the major parts at the bottom of the deck plate.
1.2.5 Major Circuit Board Assemblies Figure 1–6 shows the location of the major circuit board assemblies in the TSZ07.
1.3 Functional Description The drive is designed to stream in a start/stop environment using standard start/stop software. It uses an internal one-megabyte cache memory as an electronic tape buffer that decouples the physical and logical tape operations. The primary function of the cache memory is to provide higher performance on systems that are not able to stream. The drive has three main functional assemblies: the interface, the electronics, and the servo mechanism.
1.3.3 Servo Mechanism The mechanical assemblies of the drive are managed by the microprocessor. These assemblies control tape loading and unloading and maintain correct tape tension. The drive mechanism uses two direct-drive DC torque motors, a tachometer assembly that senses tape speed and position, and a servo-drive that eliminates the need for a capstan. Tape movement is controlled primarily by the take-up servo and the tachometer.
Chapter 2 Operation This chapter defines the use of all controls and indicators of the TSZ07 and explains how to load and unload tapes. 2.1 Controls and Indicators The controls and indicators are described in Table 2–1 and shown in Figure 2–1. NOTE The function of the front panel controls and indicators described in Table 2–1 is for normal operation. The control panel is also used in selecting service aids for configuring the drive, testing various Field Replaceable Units (FRUs) and troubleshooting.
Table 2–1: TSZ07 Controls and Indicators Item Function AC Power Switch Located at the rear of the drive (not shown in Figure 2–1). When set to the on (1) position, ac power is applied to the tape drive power supply. When set to off (0), ac power is disconnected from the power supply. This switch must be on to operate the drive. CAUTION Once the drive is installed and running on a host system, setting the switch to off (0) may interrupt the normal operation of the system.
Table 2–1 (Cont.): TSZ07 Controls and Indicators Item Function ON/OFF Switch When pressed once, connects dc power throughout the drive and lights the On/Off indicator. When pressed again, disconnects dc power and turns off the indicator. CAUTION Once the drive is installed and running on a host system, operating this switch may interrupt the normal operation of that system. When set to on, the drive initializes causing the following to occur: 1. 2. 3. 4.
Table 2–1 (Cont.): TSZ07 Controls and Indicators Item Function UNLOAD Switch Causes the drive to unload tape at any point. While the tape is unloading, the Unload indicator flashes and the message UNLOAD’G appears on the alphanumeric display. When unloading is completed, the Unload indicator lights and the message UNLOADED appears on the alphanumeric display for a short time. Before the tape can be unloaded, the drive must be placed in the offline mode.
Figure 2–1: TSZ07 Controls and Indicators Operation 2–5
2.2 Density Selection The density at which the drive is reading or writing, is termed the operating density. When the drive is active, it communicates the operating density to the alphanumeric display. The operating density is set in one of four ways: • At power-up by the drive • Commanded by the system through the interface • Found by the drive automatically when it reads the identification burst from a recorded tape • Commanded by an operator at the front panel 2.2.
2.3 Activity Messages The drive uses the alphanumeric display to provide status messages to the user. Table 2–2 lists the messages normally displayed during operation.
2.4 Automatic Tape Loading To automatically load a tape in the TSZ07, proceed as follows: CAUTION Lifting the top cover when the tape drive is powered on stops tape motion and prevents tape from loading or unloading. 1. If you are using a new reel of tape, or the leader of the tape is damaged, crimp the end of the tape. Tape crimping tool 47-00038-00 is available from Digital. 2. Open the door by gently pressing down on the center of the door. 3.
Figure 2–3: Tape Reel Insertion 5. Close the front door. 6. Press the LOAD/REWIND switch. NOTE You can load the tape with the front door open by pressing the LOAD /REWIND and DENSITY SELECT switches simultaneously. During loading, the Load/Rewind indicator flashes and the message LOADING appears in the alphanumeric display. When loading finishes, the tape density message appears. The Wrt En Test indicator also lights if a write-enable ring is installed. 7. Press the ONLINE switch.
2.5 Manual Tape Loading To load tape manually, proceed as follows: 1. Place the drive in the operator access position (procedure described in Chapter 5). 2. Make sure the tape is completely wound on the reel; and, if you intend to write data to the tape, ensure that a write-enable ring (shown in Figure 2–2) is installed on the reel. 3. Place the tape reel on the supply hub with the write-enable ring side of the reel down. The reel must lie evenly on the supply hub. 4.
Figure 2–4: TSZ07 Tape Path NOTE When performing step 7, ensure that the tape is wound five or more turns on the take-up reel, or else the tape may not manually load.
2.6 Unloading Tape Automatically 1. Check that the Online indicator is off (if not, press the ONLINE switch) and that the front panel door is closed. When the ONLINE switch is pressed, buffered commands are synchronized. Synchronization is a process that writes all data from cache to tape before executing the next command. 2. Press the UNLOAD switch. While the tape is unloading, the Unload indicator flashes and the message UNLOAD’G appears at the alphanumeric display. 3.
Chapter 3 Maintenance This chapter explains how to perform all required preventive maintenance to the tape drive, which is limited to regular cleaning of the tape path, sensors, and air filter. CAUTION It is not necessary to turn off ac power to perform preventive maintenance. However, if the ac power needs to be turned off on the tape drive, the system must be shut down first to prevent an abnormal interruption of system operation. 3.
Figure 3–1: Location of Tape Path and Sensors 3.2 Sensors The EOT, BOT, and tape-in-path transmitter and receiver (shown in Figure 3–1) should be cleaned every 40 hours. Clean the sensors by gently wiping the face of the LED transmitter and receiver with a lintless swab. No cleaning solution is required.
3.3 Air Filter The air filter is located at the inlet of the intake air duct (see Figure 3–2), and should be cleaned every six months. To clean the filter, remove the filter and clean it by blowing compressed air or vacuuming in the opposite direction of the airflow. To install the air filter, always insert the air filter through the front panel opening and ensure that the filter flexes properly into position over the intake air duct inlets (see Figure 3–2).
Chapter 4 Troubleshooting This chapter provides the following: • A description of the self-diagnostic and troubleshooting capabilities designed into the TSZ07 Tape Drive • An explanation of how tape processing errors and tape drive faults are reported and how to use the diagnostic aids (referred to as service aids) resident in the TSZ07 firmware • A list of error recovery procedures External diagnostics should be run on all systems where the TSZ07 is connected to a KZQSA.
4.2 Error Reporting Error conditions that occur during normal operation cause a message to appear in the display along with an FSC. Depending on the class of error detected, the error is also reported to the system. 4.3 Error Classification There are four classes of errors based on the severity of the problem: • Soft • Medium • Medium hard • Hard 4.3.1 Soft Error Soft errors are usually caused by an operator or a defective tape, and will prevent the drive from being loaded and placed on line.
4.4 Fault Symptom Codes The TSZ07 is capable of detecting operator errors and machine faults. When the drive detects an operator error or machine fault, a Fault Symptom Code (FSC) and Fault Message (FM) appear in the display (Table 4–1 lists the FSCs.) Error Recovery Procedures (ERP) should then be performed to correct the error or fault.
Table 4–1 (Cont.
Table 4–1 (Cont.
Table 4–1 (Cont.
Table 4–3: Error Recovery Procedure (ERP) Number Code † Description 1 Clean head and ensure tape path is free of debris. 2 Change tape reel and try again the operation that failed. 3 Cycle power to run the power-on diagnostics and try again the operation that failed. 4 Shut off power, reseat interface connectors, switch on power, and try again the operation that failed. 5 Replace indicated FRU and try again the operation that failed. 6 Call field service.
Table 4–4: Field Replaceable Units (FRU) Number Code† Description 1 Interface circuit board, single-ended SCSI(P/N 29-28477-01), differential-ended SCSI (P/N 29-30410-01) 2 Read/write circuit board (P/N 29-28480-01) 3 Head circuit board (P/N 29-28478-01) 4 Servo circuit board (P/N 29-28479-01) 5 Front panel display circuit board (P/N 29-28468-01) 6 Read/write head (P/N 29-28474-01) 7, 8 Front panel (P/N 29-28467-01) 9, 10 Control switches (P/N 29-28463-01) 11 Front door (P/N 29-28466-01)
4.5 Service Aids The TSZ07 service aids provide the capability of configuring the drive, testing various FRUs, and troubleshooting. There are three types of service aids: • Tape Unloaded Service Aids • Tape Loaded Service Aids • Special Service Aids Section 4.5.1 describes how to select the service aids, and Section 4.5.2 through Section 4.5.4 describe the three types of service aids. 4.5.1 Selecting Service Aids The service aids are selected from the front panel only when the drive is off line.
4. Press the DENSITY/SELECT switch (5) to start the service aid. A service aid may be exited by pressing the WRT EN/TEST switch 4. If a nonexistent service-aid code is entered, the drive ignores it. NOTE For ease of reference in the remainder of this chapter, the control panel switches will be referred to as switch 1, 2, 3, 4 or 5 as identified in Figure 4–1. 4.5.2 Tape-Unloaded Service Aids The tape-unloaded service aids can only be executed without the tape loaded.
Table 4–6: Service Aid 111 Switch Functions Switch Function During Test 1 Causes supply motor to rotate clockwise (MAN SPLY test) or the take-up motor to rotate counterclockwise (MAN TKUP). 2 Causes the take-up motor to rotate clockwise (MAN TKUP test) or the supply motor to rotate counterclockwise (MAN SPLY) test. 3 Reverses motor direction. 4 Exits the service aid. 5 Exits any test and returns to the MODE ? prompt.
Table 4–7: Service Aid 125 Front Panel Switches Switch Function 1 Selects the next message prompt. 2 Selects the previous message prompt. 3 Displays the revision level or interface type, depending on which message type is selected. 4 Exits the service aid. 5 No function. 4.5.2.3 Service Aid 131 (Sensors) Service Aid 131 checks the status and operation of the file protect/reel seat, BOT, EOT, and tape-in-path sensors.
4.5.2.5 Service Aid 134 (Blower) Service Aid 134 allows the blower motor to be controlled from the front panel. Switch 1 switches the blower off and on; its status appears in the alphanumeric display as BLWR ON and BLWR OFF. Switch 4 exits the service aid. 4.5.2.6 Service Aid 142 (Configuration) Service Aid 142 allows the drive configuration parameters to be reviewed and changed. Table 4–8 lists the front panel switch functions in the Review Mode. NOTE This service aid is used when a tape is not loaded.
Table 4–10: TSZ07 Configuration Parameters Configuration Parameter Default Options Unit address (UNIT) 4 0 to 7 Host supplied parity (HOST PAR) yes yes or no Default density (DFLT DEN) 6250 bpi 1600 or 6250 bpi Write sync option 2 file marks No sync, 1 file mark, 2 file marks, always Synchronize on reverse (SYNC REV). When "yes", only the second WRITE in a WRITE, BACKSPACE, WRITE string is recognized.
4. Press switch 1 or 2 to step to the next parameter value (in this case, no). 5. Press switch 3 to enter the parameter value (no), and to return the drive to the Review Mode. 6. To save the new setting in nonvolatile memory and exit the service aid, press and hold 5, and then press 4. The message SAVING appears in the display. 4.5.3 Tape-Loaded Service Aids The tape-loaded service aids can only be executed with tape loaded in the TSZ07. These service aids are listed below and described in Sections 4.5.3.
Table 4–11: Switch Functions in the Execution Mode Switch Function in Execution Mode 1 Increments the next operation in the cycle. 2 Aborts the current operation, rewinds, and skips to the next density. SKIP DEN appears in the display. 3 Locks and unlocks switching to the next density. The default is unlocked, which causes switching. Locked causes continuous cycling in the current density until switch 3 is pressed again or the service is terminated. LOCK DEN appears in the display when locked.
Table 4–13: Error Messages Message Explanation HD En Number (n) of hard errors CR E n Number (n) of corrected errors CRC E n Number (n) of cyclical redundancy check errors WT T n Number (n) of blocks that required write retries RD T n Number (n) of blocks that required read retries WT C n Number (n) of blocks that required write retries RD C n Number (n) of blocks that required read retries TRK ERRS=nK Total number (n) of read and write errors for all tracks TKt=n Total number (n) of read
Table 4–14: Service Aid 212 Front Panel Switches Switch Function 1 Displays the next selectable parameter; used with switch 3 to increment a parameter setting. 2 Displays the previous selectable parameter; used with switch 3 to decrement a parameter setting. 3 Displays the selection for a parameter; must be pressed simultaneously with switch 1 or 2 to change the selections for a parameter; displays the current selection while tape is moving.
4.5.3.4 Service Aid 223 (Multi-Pass Write/Read Check) Service Aid 223 is identical to Service Aid 211 with the following exceptions: • Service Aid 223 continues making passes until manually exited. (Service Aid 211 makes one pass that includes a sequence of operations for each density, then outputs the status.) • The first status message displayed after pressing switches 2 and 3 is PASS n, which is the number of complete passes the service aid made. 4.5.3.
Table 4–18: Front Panel Switch Functions in the Status Mode Switch Function in the Status Mode 1 Displays the errors for the density read. If no errors occurred, the message NO ERRS appears in the display. 2 May be used instead of switch 1 to view 1600 bpi status. Displays the errors for 1600 bpi density in the sequence shown in Table 4–19. If no errors occurred, the message NO ERRS appears in the display. Do not press if 6250 bpi tape was read, it will cause unpredictable results.
4.5.4 Special Service Aids The special service aids are listed below and described in Sections 4.5.4.1 through 4.5.4.6. • Service Aid 513 (Head Calibration) • Service Aid 524 (Memory Initialization) • Service Aid 525 (Motor Calibration) • Service Aid 533 (Door Lock and Interlock Disable) • Service Aid 542 (Vendor ID) • Service Aid 543 (Product ID) 4.5.4.
During this service aid the front panel switches function as described in Table 4–20. Table 4–20: Front Panel Switch Functions During Service Aid 524 Switch Function 1 Initializes memory and exits the service aid. The message SAVING appears in the display. 2 No function. 3 No function. 4 Aborts initialization and exits the service aid. 5 No function. 4.5.4.3 Service Aid 525 (Motor Calibration) Service Aid 525 automatically calibrates the servo offset values.
4.5.4.5 Service Aid 542 (Vendor ID) This service aid allows the Vendor ID field for the SCSI Inquiry (12h) command response to be edited. When the service aid begins, the current Vendor ID appears in the display and a cursor is placed on the left character space. The Vendor ID is factory set to DEC. During this service aid, the front panel switches function as described in Table 4–22.
Chapter 5 Removal/Replacement Procedures This chapter provides the removal and replacement procedures for most field replaceable units (FRUs). The procedures included in this manual are based on the recommended spares listed in Table 5–1. The removal/replacement procedures provided are intended for use by qualified technicians familiar with the drive.
Table 5–1: TSZ07 FRUs Part Number Removal/Replacement Procedure Section AC Power Cord, 120 Vac, (BN19P-1K), US/Canada/Japan 17-00606-02 — — AC Power Cord (BN19K-2E), Denmark 17-00310-08 — — AC Power Cord (BN26B-2E), UK/Ireland 17-00209-15 — — AC Power Cord (BN19W-2E), Germany /Central Europe 17-00199-21 — — AC Power Cord (BN19Z-2E), Italy 17-00364-18 — — AC Power Cord, 240 Vac, US/Canada /Japan 17-00083-44 — — AC Power Cord (BN22P-2E), Israel 17-00457-16 — — AC Power Cord (BN2
Table 5–1 (Cont.): TSZ07 FRUs FRU Part Number Removal/Replacement Procedure Section Hub Lock Solenoid 29-28475-01 Hub Lock Solenoid 5.4.10 Interface SCSI PWB Assy, Single-ended 29-28477-01 Interface Circuit Board 5.4.12 Interface SCSI PWB Assy, Differential 29-30410-01 Interface Circuit Board 5.4.12 Door Lock 29-28476-01 Door Lock 5.4.4 Interlock Switch 29-28476-02 Interlock Switch 5.4.13 Plenum Assy 29-28482-01 Plenum 5.4.17 Power Supply Assy 29-28461-01 Power Supply 5.4.
5.1 Tools and Materials Table 5–2 lists the special tools and materials necessary to service the TSZ07 Tape Drive. Table 5–2: Special Tools and Materials Item Part Number Tape, Master Skew FD-11319-01 Glyptol 90-09536-00 Loctite 601 90-09321-00 Lubriplate — Tape, Cleaning Kit 22-00012-00 (TUC01-00) Tape, Crimping Tool 47-00038-00 Interlock Disable Tool 29-28408-01 5.2 Opening the Tape Drive to the Operator Access Position The operator access position provides access to the tape path.
5.2.2 Operator Access for the Table-Top Drive To place the tape drive in the operator access position, proceed as follows: NOTE Step 1 applies to early versions of the TSZ07 which have latches that engage the top cover. If these latches are not present, proceed to step 2. 1. Push down on the top front corners to release the latches, then lift the enclosure lid. 2. Raise the top cover and place the cover retainer arm in the recess next to the tape path. To close the enclosure, proceed as follows: 1.
5.3 Opening the Tape Drive to the Service Access Position The service access position provides access to the internal electronic and mechanical parts of the drive. There are two procedures for obtaining service access to the drive, one for the rack-mounted drive and one for the table-top drive, as follows: • Service Access for the Rack-Mount Drive • Service Access for the Table-Top Drive 5.3.
Figure 5–2: Location of Retaining Screws 5. Fold the cover retaining arm out of the way and then close the top cover. 6. While grasping the bottom of the front panel, lift upward. When the gas strut is fully extended, the safety support automatically locks the deck plate in the service access position. The service access position is shown in Figure 5–3. WARNING Do not service the drive unless the safety support is set against the gas strut shaft.
Figure 5–3: Service Access Position To reinstall the drive into the cabinet or rack, proceed as follows: CAUTION When performing the next step, make sure the cables are secure and are not pinched. 1. Pull upward on the safety support to disengage it, then lower the deck plate. 2. Raise the top cover and place the cover retainer arm in the recess next to the tape path. 3. Tighten the two retaining screws into the chassis. 4. Press the slide locks inward and push the drive into the cabinet.
5.3.2 Service Access for the Table-Top Drive To place the tape drive in the service access position, proceed as follows: NOTE Step 1 applies to early versions of the TSZ07 which have latches that engage the top cover. If these latches are not present, proceed to step 2. 1. Push down on the top front corners to release the latches, then lift the enclosure lid. 2. Raise the top cover and place the cover retainer arm in the recess next to the tape path. 3.
5.4 Removal/Replacement Procedures The following sections provide the specific removal/replacement procedures for the TSZ07. These procedures are intended for use by qualified technicians who are thoroughly familiar with the tape drive. Therefore, it is assumed that technicians know whether the drive needs to be placed in the operator access position or the service access position to perform a particular removal and replacement procedure.
Figure 5–4: Removing the Blower Removal/Replacement Procedures 5–11
5.4.2 Control Switch Circuit Board (P/N 29-28463-01) To remove the control switch circuit board, see Figure 5–5 and proceed as follows: 1. Remove the front panel display circuit board (refer to Section 5.4.8). 2. Remove two nuts ! to remove control switch circuit board ". To replace the control switch circuit board, follow the removal procedure in reverse order.
5.4.3 Front Door (P/N 29-28466-01) To remove the front door, see Figure 5–6 and proceed as follows: 1. Remove the front panel (refer to Section 5.4.7). 2. With the front door fully opened, remove the two springs 3. Push the front door inward to separate the arms 4. Remove the front door !. " from the pivots #. $ through the opening in the front panel. To replace the front door, follow the removal procedure in reverse order. However, note the following about lubrication and spring attachment: 1.
5.4.4 Door Lock (P/N 29-28476-01) To remove the door lock, see Figure 5–7 and proceed as follows: 1. Disconnect both connectors 2. Remove the two clips lock. ! and " from the door lock #. $ securing the door lock to the front panel, then remove the door To replace the door lock, follow the removal procedure in reverse order. However, note the following about installing clips and using the service aid: 1. Follow the removal procedure in reverse order. The tab on the clips $ goes downward. 2.
5.4.5 EOT/BOT Sensor Assembly (P/N 29-28649-01) To remove the EOT/BOT Sensor Assembly, see Figure 5–8 and proceed as follows: ! 1. Remove the two screws and washers securing the EOT/BOT Sensor Assembly deck plate, then remove the assembly. 2. Disconnect the connector " to the # from the EOT/BOT Sensor Assembly. To replace the sensors, follow the removal procedure in the reverse order. Use Service Aid 132 (Section 4.5.2.4) to verify that both sensors function properly.
5.4.6 File-Protect Sensor (P/N FD-11389-01) To remove the file-protect sensor, see Figure 5–9 and proceed as follows: ! from the file-protect sensor ". Remove the two screws # securing the sensor to the deck plate. 1. Disconnect the cable 2. To replace the file-protect sensor, follow the removal procedure in the reverse order. Use Service Aid 131 (Section 4.5.2.3) to verify that the sensor functions properly.
5.4.7 Front Panel (P/N 29-28467-01) To remove the front panel, see Figure 5–10 and proceed as follows: ! securing the front panel " to the deck plate %. Disconnect the electrical connectors # and $, then remove the front panel. 1. Remove the four screws 2. To replace the front panel, follow the removal procedure in the reverse order. Use Service Aid 132 (Section 4.5.2.4) to verify that the door lock functions properly.
5.4.8 Front Panel Display Circuit Board (P/N 29-28468-01) To remove the front panel display circuit board, see Figure 5–11 and proceed as follows: 1. Remove the front panel (refer to Section 5.4.7). ! by placing a board 2. Release the front panel display circuit board from the four standoffs removal tool over the standoff and gently prying the board away from the standoff. 3. Connector J5, on the opposite side of the board, connects to the control switch circuit board shown in Figure 5–5.
Figure 5–11: Removing the Front Panel Display Circuit Board Removal/Replacement Procedures 5–19
5.4.9 Head Circuit Board (P/N 29-28478-01) To remove the head circuit board, see Figure 5–12 and proceed as follows: CAUTION When removing or replacing the head circuit board, be careful not to damage the head cables plugged into J3 and J4 of the head circuit board; they are fragile. The cable plugged into J3 (closest to J2 ) is referred to as the Read Head Flex Circuit Assembly (P/N 29-28473-01) in Table 5–1.
Figure 5–12: Removing the Head Circuit Board Removal/Replacement Procedures 5–21
5.4.10 Hub Lock Solenoid (P/N 29-28475-01) To remove the hub lock solenoid, see Figure 5–13 and proceed as follows: ! from the hub lock solenoid ". Remove the two screws # attaching the solenoid to the deck plate, then remove the 1. Disconnect the connector 2. solenoid. To replace the hub lock solenoid, follow the removal procedure in the reverse order. However, make sure the bell crank plunger is inserted through the spring and into the solenoid .
Figure 5–13: Removing the Hub Lock Solenoid Removal/Replacement Procedures 5–23
5.4.11 Input Air Duct There are two procedures for removing the input air duct. The procedure used depends on if the TSZ07 has a plenum with or without a removable access panel. To remove the input air duct, see Figure 5–14 and proceed to Section 5.4.11.1 or Section 5.4.11.2 as appropriate: 5.4.11.1 Removal Procedure Without Plenum Access Panel Use this procedure if the plenum does not have a removable access panel. 1. Remove the front panel (refer to Section 5.4.7). ! 2.
Figure 5–14: Removing the Input Air Duct Removal/Replacement Procedures 5–25
5.4.12 Interface Circuit Board (P/N 29-28477-01/29-30410-01) To remove the interface circuit board, see Figure 5–15 and proceed as follows: 1. If possible, record configuration parameters before replacing the board. Use Service Aid 142 to review the configuration parameters. For information on Service Aid 142, refer to Section 4.5.2.6. 2. Remove the read/write formatter circuit board (refer to Section 5.4.19). 3. Disconnect connectors J1 !, J5 ", and J6 #. $ by placing the board removal 4.
Figure 5–15: Removing the Interface Circuit Board Removal/Replacement Procedures 5–27
5.4.13 Interlock Switch (P/N 29-28476-02) To remove the interlock switch, see Figure 5–16 and proceed as follows: 1. Remove the front panel (refer to Section 5.4.7). 2. Disconnect the two wires ! from the interlock switch ". 3. Press inward on the sides of the switch and move it upward to remove it. To replace the interlock switch, follow the removal procedure in reverse order.
5.4.14 Left Output Air Duct To remove the left output air duct, see Figure 5–17 and proceed as follows: ! attaching the air duct " to the deck plate. Disconnect the air duct from the nozzle #. 1. Remove the screw 2. To replace the left output air duct, follow the removal procedure in reverse order.
5.4.15 Manual Release Switch To remove the manual release switch, refer to Figure 5–18 and proceed as follows: 1. Remove the front panel (refer to Section 5.4.7). 2. Place both front panel cables behind the metal shield. The metal shield is located behind the front panel and not shown in Figure 5–18. 3. Remove the screw attaching the right output air duct to the shield. 4. Remove the three screws attaching the metal shield to the deck plate, then remove the shield. ! 5.
5.4.16 Packer Arm To remove the packer arm, refer to Figure 5–19 and proceed as follows: 1. Remove the read/write formatter circuit board (refer to Section 5.4.9). ! and wave washer ". Remove the packer arm # from the deck plate by pulling it upward. Check whether the upper bearing $ and lower bearing % are damaged. 2. Remove the grip ring 3. 4. Replace if necessary. To replace the packer arm, follow the removal procedure in reverse order.
5.4.17 Plenum (P/N 29-28482-01) To remove the plenum, refer to Figure 5–20 and proceed as follows: 1. Remove the left output air duct (refer to Section 5.4.14). 2. Remove the right output air duct (refer to Section 5.4.21). 3. Remove the input air duct (refer to Section 5.4.11). 4. Disconnect the motor connector 5. Remove the four screws !. " attaching the plenum # to the top plate. To replace the plenum, follow the removal procedure in reverse order.
Figure 5–20: Removing the Plenum Removal/Replacement Procedures 5–33
5.4.18 Power Supply (P/N 29-28461-01) To remove the power supply, refer to Figure 5–21 and proceed as follows: ! and J2 " from the power supply #. Remove the two nuts $ and nut plate % attaching the power supply to the side of the 1. Disconnect the connector J1 2. chassis. 3. Remove the two nuts & attaching the power supply to the bottom of the chassis. 4.
Figure 5–21: Removing the Power Supply Removal/Replacement Procedures 5–35
5.4.19 Read/Write Formatter Circuit Board (P/N 29-28480-01) To remove the read/write formatter circuit board, refer to Figure 5–22 and proceed as follows: ! and J4 ". Remove the two screws #. Release the circuit board $ from the standoff % by pulling the board off the standoff. Remove the board by pulling on the two extractor grips &. 1. Disconnect J3 2. 3. 4. To replace the read/write formatter board, follow the removal procedure in reverse order. Run Service Aid 513 (refer to Section 4.5.4.1).
Figure 5–22: Removing the Read/Write Formatter Circuit Board Removal/Replacement Procedures 5–37
5.4.20 Read/Write Head (P/N 29-28472-01) To remove the read/write head, see Figure 5–23 and proceed as follows: 1. Remove the head circuit board (refer to Section 5.4.9). ! that attach the read/write head " to the deck plate $. While holding the head, remove the center screw #, then remove the head. 2. Remove the four screws 3. To replace the read/write head, proceed as follows: 1. Follow the removal procedure in reverse order.
5.4.21 Right Output Air Duct To remove the right output air duct, refer to Figure 5–24 and proceed as follows: • • • Remove the front panel (refer to Section 5.4.7). ! attaching the air duct " to the deck plate. Disconnect the air duct from the nozzle # and slide it forward through the opening in Remove the screw the shield. To replace the right output air duct, follow the removal procedure in reverse order.
Figure 5–24: Removing the Right Output Air Duct 5–40 Removal/Replacement Procedures
5.4.22 Roller Guide 1 (P/N 29-24101-00) To remove roller guide 1, refer to Figure 5–25 and proceed as follows: ! attaching the roller guide ", then remove the roller guide. If there are any shims # between the roller guide and the mounting plate $, save them. 1. Remove the screw 2. NOTE Any shims removed from the location of roller guide 1 must be used again when replacing the roller guide. Do not swap shims between rollers.
5.4.23 Roller Guide 2 For removal and replacement instructions for roller guide 2, refer to Section 5.4.34. 5.4.24 Roller Guide 3 or 4 (P/N 29-24081-00) To remove roller guide 3 or 4, refer to Figure 5–26 and proceed as follows: 1. Remove the screw ! securing the roller guide ", then remove the roller guide. To replace roller guide 3 or 4, perform the removal procedure in reverse order.
5.4.25 Roller Guide 5 (P/N 29-24081-00) To remove roller guide 5, refer to Figure 5–27 and proceed as follows: ! from the top of the roller guide ", then remove the roller guide. If there are any shims # between the roller guide and the mounting plate $, save them. 1. Remove the screw 2. NOTE Any shims removed from the location of roller guide 5 must be used again when replacing roller 5. Do not swap shims between rollers.
5.4.26 Servo Circuit Board (P/N 29-28479-01) To remove the servo circuit board, refer to Figure 5–28 and proceed as follows: 1. Remove the read/write formatter circuit board (refer to Section 5.4.19). 2. Disconnect connectors J2 # ! and J3 ". 3. Release the board from the nine standoffs by placing the board removal tool over each standoff and gently prying the board away from the standoff. To replace the servo circuit board, proceed as follows: 1. Perform the removal procedure in reverse order. 2.
Figure 5–28: Removing the Servo Circuit Board Removal/Replacement Procedures 5–45
5.4.27 Supply Hub (P/N 29-24077-00) To remove the supply hub, refer to Figure 5–29 and proceed as follows: ! 1. Rotate the supply hub until the two screws shaft are facing toward the front door. 2. Loosen the two screws " that secure the supply hub to the motor ", then remove the supply hub. To replace the supply hub, proceed as follows: 1. Install the supply hub ! on the motor shaft, but do not tighten the two screws. 2. Perform the Supply Hub Adjustment (refer to Section 6.4).
5.4.28 Supply Hub Bell Crank To remove the supply hub bell crank, refer to Figure 5–30 and proceed as follows: 1. Remove the supply hub (refer to Section 5.4.27). 2. Remove the clip the bell crank. ! securing the supply hub bell crank " to the supply motor, then remove To replace the supply hub bell crank, proceed as follows: 1. Perform the removal procedure in reverse order. 2. To ensure that the hub lock functions properly, run Service Aid 132 (refer to Section 4.5.2.4).
5.4.29 Supply Motor (P/N 29-28470-01) To remove the supply motor, refer to Figure 5–31 and proceed as follows: 1. Remove the supply hub (refer to Section 5.4.27). ! securing the supply hub bell crank " to the supply motor #. Disconnect the two connectors ($ and %) from the motor. Loosen the four screws & securing the supply motor to the deck plate. Hold the motor while removing the four screws &. When removing the motor from the deck plate, slide the supply hub bell crank " off the stud ' on the motor. 2.
Figure 5–31: Removing the Supply Motor Removal/Replacement Procedures 5–49
5.4.30 Take-Up Hub To remove the take-up hub, refer to Figure 5–32 and proceed as follows: ! away from the take-up hub " using tape or string. Loosen the two screws # that secure the take-up hub " to the take-up motor shaft, then 1. Secure the packer arm 2. remove the take-up hub. To replace the take-up hub, proceed as follows: 1. Install the take-up hub " on the take-up motor shaft. Do not tighten the two screws #. 2. Perform the Take-Up Hub Adjustment (refer to Section 6.5).
Figure 5–32: Removing the Take-Up Hub Removal/Replacement Procedures 5–51
5.4.31 Take-Up Motor (P/N 29-28469-01) To remove the take-up motor, refer to Figure 5–33 and proceed as follows: 1. Remove the take-up hub (Section 5.4.30) and the plenum (Section 5.4.17) or the plenum access panel, depending on the configuration. ! and ") from the motor #. 2. Disconnect the two connectors ( $ securing the take-up motor to the deck plate. Hold the motor while removing the four screws $, then remove the motor. 3. Loosen the four screws 4.
Figure 5–33: Removing the Take-Up Motor Removal/Replacement Procedures 5–53
5.4.32 Tape-In-Path Receiver (P/N 29-24093-00) To remove the tape-in-path receiver, refer to Figure 5–34 and proceed as follows: ! from the tape-in-path receiver ". Remove the screw # attaching the tape-in-path receiver " to the deck plate, then remove 1. Disconnect the connector 2. the receiver. To replace the tape-in-path receiver, proceed as follows: 1. Perform the removal procedure in reverse order. 2. Check that the sensor functions properly using Service Aid 131 (Section 4.5.2.3).
5.4.33 Tape-In-Path Transmitter (P/N 29-28483-01) To remove the tape-in-path transmitter, refer to Figure 5–35 and proceed as follows: ! from the tape-in-path transmitter ". Remove the two screws # attaching the tape-in-path transmitter " to the deck plate, 1. Disconnect the connector 2. then remove the transmitter. To replace the tape-in-path transmitter, proceed as follows: 1. Perform the removal procedure in reverse order. 2. Check that the sensor functions properly using Service Aid 131 (Section 4.
5.4.34 Tension Sensor/Roller Guide 2 (P/N 29-28471-01) To remove tension sensor/roller guide 2, refer to Figure 5–36 and proceed as follows: ! from the head circuit board. Remove the screw " attaching the roller guide #, then remove the roller guide. If there are any shims $, save them. 1. Disconnect connector J5 2. 3. NOTE $ Any shims removed from the location of tension sensor/roller guide 2 must be used again when replacing the roller guide. Do not swap shims between roller guides.
Figure 5–36: Removing Tension Sensor/Roller Guide 2 Removal/Replacement Procedures 5–57
5.4.35 Top Cover (P/N 29-28462-01) To remove the top cover, refer to Figure 5–37 and proceed as follows: 1. Remove the four screws cover. ! attaching the top cover " to the hinges, then remove the top To replace the top cover, proceed as follows: 1. Perform the removal procedure in reverse order. 2. If necessary, adjust the rear hinges so that the top cover opens and closes without binding. 3. If necessary, adjust the top cover latches to ensure that the top cover closes correctly.
Chapter 6 Adjustment Procedures This chapter provides the Interlock Switch Disable Procedure to disable the front panel for troubleshooting, testing and adjustment of the drive. This chapter also provides the following adjustment procedures and the Operation Verification procedure.
6.1 Interlock Switch Disable Procedure This procedure describes how to disable the top cover interlock switch on the front panel using the interlock switch disable tool (P/N 29-28408-01) for troubleshooting, testing, and adjustment purposes. Disabling this interlock switch also disables the front door lock. Another method of disabling the top cover interlock switch and front door lock is by using Service Aid 533, as described in Section 4.5.4.4. To disable the interlock switch, proceed as follows: 1.
Figure 6–1: Location of Interlock Switch Adjustment Procedures 6–3
6.2 Read Threshold Adjustment The read threshold adjustment calibrates the read/write head by adjusting the write current to the head and setting the read-after-write threshold for all densities. To make this adjustment, proceed as follows: 1. Switch on the drive. 2. Load a reference level tape, or a known good tape, with a write-enable ring. Data will be written to the tape. 3. Run Service Aid 513. It automatically adjusts the read threshold. For information on the service aid, refer to Section 4.5.4.1.
9. Unload the master skew tape and exit the service aid. 10. Disconnect the oscilloscope.
Figure 6–3: Skew Adjustment Waveform 6–6 Adjustment Procedures
6.4 Supply Hub Adjustment The supply hub adjustment is used to set the vertical position of the supply hub on the supply motor shaft so that tape is wound and rewound properly on a loaded reel. To perform this adjustment, proceed as follows: 1. Refer to Figure 6–4 and then loosen the two screws supply motor shaft. " securing the supply hub ! to the Figure 6–4: Location of Supply Hub Screws 2.
6. After the tape has been completely unwound and rewound back on the supply reel, check that the tape is vertically centered on the supply hub (top or bottom of the tape should not be rubbing on the reel). If the tape is centered, the adjustment is correct; if not, proceed as follows: a. Unload the tape. b. Loosen the two screws on the supply hub. c. Move the hub up or down as necessary on the motor shaft. d. Retighten the screws, then go back to step 4.
6.5 Take-Up Hub Adjustment The take-up hub adjustment is used to set the vertical position of the take-up hub on the take-up motor shaft so that tape is wound and rewound properly on the take-up hub. To perform this adjustment, proceed as follows: 1. Refer to Figure 6–6, and secure the packer arm tape or string. 2. Loosen the two screws ! away from the take-up hub " using # securing the take-up hub " to the motor shaft $. 3. Align the base of the take-up hub with the top plate. 4.
Figure 6–6: Adjusting the Take-Up Hub 6–10 Adjustment Procedures
6.6 Operation Verification When you have completed troubleshooting, replaced a FRU, or made an adjustment to the drive, the drive must be verified for proper operation. To verify the drive operation, proceed as follows: 1. Power on the drive and see that it passes the power up diagnostics as described in Chapter 4. 2. Load a tape and run it to EOT and back to BOT, or use Service Aid 222. For details on Service Aid 222, refer to Section 4.5.3.3. 3. Read and write to a known good tape or use Service aid 212.
Appendix A Specifications Table A–1 provides the physical, environmental, electrical, and performance specifications for the TSZ07 Tape Drive. Table A–1: TSZ07 Specifications PHYSICAL Table-Top Unit (TSZ07-CA/FA) Rackmount Unit (TSZ07-AA/DA) Cabinet Unit (TSZ07-BA/BB, -EA /EB) Height 26.90 cm (10.59 in) 22.23 cm (8.75 in) 106.7 cm (42 in) Width 50.50 cm (19.88 in) 43.18 cm (17.00 in) 55.9 cm (22 in) Depth 68.43 cm (26.94 in) 62.23 cm (24.5 in) 76.2 cm (30 in) Weight 36.74 kg (81 lbs) 31.
Table A–1 (Cont.): TSZ07 Specifications ENVIRONMENTAL Acoustic Noise Emission Acoustics—declared values per ISO 9296 and ISO 7779: Sound Power Level LWAd, B Sound Pressure Level LpAm, dBA (bystander positions) Product Idle Operate Idle Operate TSZ07-CA 5.8 6.2 41 43 TSZ07-BA/B 5.8 6.2 38 43 TSZ07-AA 5.8 6.2 39 43 (Current values for specific configurations are available from Digital representatives. 1 B = 10 dBA.
Table A–1 (Cont.): TSZ07 Specifications ENVIRONMENTAL Relative Humidity (Noncondensing) Operating with tape 20% to 80% Operating without tape 10% to 90% Non-operating 95% max. Storage 10% to 95% 2400 m (8,000 ft) max. Non-operating 9000 m (30,000 ft) max. Altitude Operating PERFORMANCE Tape Speed Record 100 ips (2.
Table A–1 (Cont.): TSZ07 Specifications PERFORMANCE SCSI Data Transfer Rates Mode: Asynchronous Synchronous Cable Length: Rate (maximum): 1.5 Mb/sec (Asynchronous) 4.0 Mb/sec (Synchronous) Part Number TSZ07-AA Single-ended TSZ07-BA Single-ended TSZ07-BB Single-ended TSZ07-CA Single-ended TSZ07-DA Differential-ended TSZ07-EA Differential-ended TSZ07-EB Differential-ended TSZ07-FA Differential-ended Tape Data Capacity (Unformatted) Density 2400 ft (732m) Reel Size 15.25 17.78 21.
Table A–1 (Cont.): TSZ07 Specifications POWER The ac power supply operates on single-phase ac power. The supply provides auto-range operation in either of two voltage ranges, low or high (see below). The power supply automatically selects the appropriate voltage and frequency range without any internal or external modification.
Appendix B Small Computer System Interface (SCSI) B.1 Introduction The Small Computer System Interface (SCSI) consists of circuitry and a bus for handling control signals, messages, status bytes, and commands. The SCSI 2 generates signals and translates tape drive data and status information into the appropriate format for the SCSI bus. Commands presented to the SCSI bus are translated into drive executable commands by the interface.
Table B–1: SCSI Bus Signals Signal Name Description Acknowledge (ACK) Set by an initiator to acknowledge a REQ/ACK data transfer handshake. Attention (AN) Set by an initiator to indicate the Attention condition. Busy (BSY) Indicates that the bus is being used. Control/Data (C/D) Indicates whether control information or data is on the bus. A true signal indicates control. Data Bits (DB0-7, P) There are eight data bits and a parity bit.
Table B–2: Pin Assignments for the Single-Ended Shielded Connections Signal Contact Number Contact Number Signal † Ground 1 26 -DB0 Ground 2 27 -DB1 Ground 3 28 -DB2 Ground 4 29 -DB3 Ground 5 30 -DB4 Ground 6 31 -DB5 Ground 7 32 -DB6 Ground 8 33 -DB7 Ground 9 34 -DBP Ground 10 35 Ground Ground 11 36 Ground Ground 12 37 Ground Open 13 38 TERMPWR Ground 14 39 Ground Ground 15 40 Ground Ground 16 41 -AN Ground 17 42 Ground Ground 18 43
Table B–3: Pin Assignment for the Differential Shielded Connections Signal Contact Number Contact Number Signal Ground 1 26 Ground +DB0 2 27 -DB0 +DB1 3 28 -DB1 +DB2 4 29 -DB2 +DB3 5 30 -DB3 +DB4 6 31 -DB4 +DB5 7 32 -DB5 +DB6 8 33 -DB6 +DB7 9 34 -DB7 +DBP 10 35 -DBP DIFFSENS 11 36 Ground Open 12 37 Open TERMPWR 13 38 TERMPWR Open 14 39 Open +ATN 15 40 -ATN Ground 16 41 Ground +BSY 17 42 -BSY +ACK 18 43 -ACK +RST 19 44 -RST +MSG
B.3 SCSI Bus Phases A description of the SCSI bus phases are provided in Table B–4. Table B–4: SCSI Bus Phases Bus Phase Description Bus control phases: Bus Free Indicates that no SCSI device is actively using the bus. Arbitration Allows one SCSI device to gain control of the bus. Selection Allows an initiator to select a target. Reselection Allows the target to reconnect to an initiator. Information transfer phases: Command Allows the target to request command information from the initiator.
B.5 SCSI Message System The SCSI message system allows communication between an initiator and a target for the purpose of interface management. A message may be one, two or multiple bytes in length. One or more messages may be sent during a single Message phase, but a message may not be split over Message phases. The initiator is required to end the Message Out phase (by negating AN) when it sends certain messages. B.5.
B.5.2 Messages Table B–6 lists the SCSI messages implemented by Digital in the TSZ07.
B.6 Status A status byte must be sent from the target to the initiator during the Status phase at the completion of each command. The contents of the SCSI status byte must conform to rules of the SCSI 2 specification. Otherwise, there are no restrictions on the use of this byte. Table B–7 lists the status bytes. Table B–7: Status Bytes Status Byte Description Good The target has successfully completed the command.
B.7 Commands For a complete discussion of the SCSI commands implemented by Digital, please refer to the Small Computer Systems Interface: A Developer’s Guide (EK-SCSIS-DK). Table B–8 provides a list of the supported SCSI commands for the TSZ07.
