User's Manual

ManualsBrandsPark Air Systems ManualsElectronics50W Transceiver

M7X and M7R Page 5-7 Maintenance

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Unscheduled Maintenance

The unscheduled maintenance detailed in this documentation describes diagnosis using the Built-In-Test

facility and rectification by module replacement.

An M7 radio weighs up to 26 kg. A minimum of two people should be used to lift the radio.

Special consideration should be given if the radio has to be lifted at height, for example from

the top of an equipment cabinet. Failure to take the necessary precautions can result in injury

to personnel.

All procedures given in this topic assume that the faulty radio has been removed from its operational

position and placed on a suitable work-bench.

This equipment contains devices sensitive to electrostatic discharge. Precautions applicable to

handling such equipment, including anti-static work surfaces and protection using wrist straps

connected to earth, should always be taken.

Tools and Test Equipment

The following tools and test equipment will be required to perform the unscheduled maintenance

procedures detailed in this documentation:

(1) Torx Screwdriver, size T10.

(2) Torx Screwdriver, size T15.

(3) Torx Screwdriver, size T20.

(4) Frequency counter able to measure 10.000 000 MHz. (when replacing the Processor module).

Part Numbers

Part numbers for the modules and other replaceable items are listed in Table 5-1.

WARNING Heavy Item

Caution ESDs

Summary of content (20 pages)

PAGE 1
Back to Menu Unscheduled Maintenance The unscheduled maintenance detailed in this documentation describes diagnosis using the Built-In-Test facility and rectification by module replacement. WARNING Heavy Item An M7 radio weighs up to 26 kg. A minimum of two people should be used to lift the radio. Special consideration should be given if the radio has to be lifted at height, for example from the top of an equipment cabinet. Failure to take the necessary precautions can result in injury to personnel.
PAGE 2
Back to Menu Table 5-1 Part Numbers Description Park Air Part Number Notes Modules: PSU B68-70000701 Processor module B68-70000711 RF control module B68-70000712 Control head B68-70000714 Interface module B68-70000715 RF PA B68-70000716 Transceiver only RF switch B68-70000735 Receiver only Guard receiver module B68-70000725 Optional module Custom interface module Allocated for an individual user.
PAGE 3
Back to Menu Built-in-Test (BIT) The BIT facility continuously monitors key radio parameters and indicates BIT status at the Control Head. The Control Head’s BIT button lights to provide the indications shown in Fig 5-4.
PAGE 4
Back to Menu In this figure, Processor Module is highlighted; this is BIT Monitored Parameters 1 of 28 in the List. The Up and Down keys allow scrolling through all BIT Monitored Parameters. The number of BIT parameters that are monitored depends on the radio type, and the options that are fitted. The number 28 shown in this figure, is an example.
PAGE 5
Back to Menu Table 5-2 BIT Parameters (Continued) Parameter Monitoring Range Remedial Reference Linearisation feedback cable OK or Fault See Replacing Faulty Cables on page 38. Rx 90 MHz IF cable OK or Fault See Replacing Faulty Cables on page 38. Tx 90 MHz IF cable OK or Fault See Replacing Faulty Cables on page 38. Transmit drive cable OK or Fault See Replacing Faulty Cables on page 38. 10 MHz reference input OK, Fault or N/A See Replacing Faulty Cables on page 38.
PAGE 6
Back to Menu Removing the Top or Bottom Cover WARNING Dangerous Voltage Ensure the input ac and dc supplies are disconnected before removing the top or bottom cover. WARNING Dangerous Voltage Do not remove the top or bottom cover for at least one minute after switching off the radio. To remove the radio’s top or bottom cover: (1) Ensure that the input ac and dc supplies are disconnected from the radio.
PAGE 7
Back to Menu Replacing a Fan Three fans are fitted on a transceiver’s rear panel as shown in Fig 5-7. The serviceability of each fan is reported through the BIT system as shown in Fig 5-8. Heat Sink Fan 1 Heat Sink Fan 2 Main Chassis Fan Fig 5-7 Fan Identification Note that Heat Sink Fan 1 and Heat Sink Fan 2 differ in type from the Main Chassis Fan. See Table 5-1 for part numbers.
PAGE 8
Back to Menu Securing Screws (4 off) Fan Body Finger Guard Fig 5-9 Fan with Finger Guard Fitted (6) Push the finger guard onto the fan’s body. (7) Reapply power to the radio. Ensure that the fan is operating and that the appropriate BIT parameter (Fig 5-8) reads OK.
PAGE 9
Back to Menu Replacing the Control Head WARNING Dangerous Voltage Ensure the input ac and dc supplies are disconnected before removing the Control Head. Caution ESDs This equipment contains devices sensitive to electrostatic discharge. Precautions applicable to handling such equipment, including wearing a static protection wrist strap connected to earth, should always be taken.
PAGE 10
Back to Menu Fig 5-12 Replacing the Control Head (2) (3) From the Control Head, disconnect the three cables listed below and then remove the control head from the radio. The cable from the loudspeaker box connects to the Control Head’s connector The cable from the E1 connector shown in Fig 5-13 connects to the Control Head’s E1 connector The cable from the Supply connector shown in Fig 5-13 connects to the Control Head’s connector.
PAGE 11
Back to Menu These connectors do not have to be disconnected when removing the Control Head. This figure is included only to identify the cables should one of them become inadvertently disconnected. Supply. To Control Head Connector E1. To Control Head E1 Connector These two connectors are located behind the Control Head (looking from the radio’s front) on the left-hand side.
PAGE 12
Back to Menu Plug-In Modules The radio contains a number plug-in modules. These are listed below and are located as shown in Fig 5-14. Note that after replacing any module, the build status requires amendment – see Data Loader Application starting on page 5-39. Module position A – Not used Module position B – Custom Interface module. This is an optional module used to accommodate a user’s special interfacing requirement. Module position C – Guard Receiver module.
PAGE 13
Back to Menu Module Connection Socket Fig 5-15 Module Connection Socket Modules B to F are secured in position using two screws as shown in Fig 5-16.
PAGE 14
Back to Menu Replacing the Custom Interface Module WARNING Dangerous Voltage Ensure the input ac and dc supplies to the radio are disconnected before removing the top cover. WARNING Dangerous Voltage Do not remove the radio’s top cover for at least one minute after switching off the radio. Caution ESDs This equipment contains devices sensitive to electrostatic discharge.
PAGE 15
Back to Menu Replacing the Guard Receiver Module WARNING Dangerous Voltage Ensure the input ac and dc supplies to the radio are disconnected before removing the top cover. WARNING Dangerous Voltage Do not remove the radio’s top cover for at least one minute after switching off the radio. Caution ESDs This equipment contains devices sensitive to electrostatic discharge.
PAGE 16
Back to Menu Replacing the Processor Module WARNING Dangerous Voltage Ensure the input ac and dc supplies to the radio are disconnected before removing the top cover. WARNING Dangerous Voltage Do not remove the radio’s top cover for at least one minute after switching off the radio. Caution ESDs This equipment contains devices sensitive to electrostatic discharge.
PAGE 17
Back to Menu (13) Refer to page 5-47 and complete the procedure ‘Setting the Carrier Power Trim’ (14) Refer to page 5-4 and check, resetting as necessary, the radio’s internal frequency reference. (15) Disconnect the Lemo to USB cable and restore the radio ready for operational use.
PAGE 18
Back to Menu Replacing the RF Control Module WARNING Dangerous Voltage Ensure the input ac and dc supplies to the radio are disconnected before removing the top cover. WARNING Dangerous Voltage Do not remove the radio’s top cover for at least one minute after switching off the radio. Caution ESDs This equipment contains devices sensitive to electrostatic discharge.
PAGE 19
Back to Menu (10) Connect the radio to a PC using the Lemo to USB cable. (11) Reapply input power to the radio. (12) Download the RF Control module software from the Park Air radio software CD. Instructions for downloading software are given under the heading ‘Data Loader Application’ starting on page 5-39. (13) Refer to page page 47 and complete the procedure ‘Setting the Carrier Power Trim’ (14) Disconnect the Lemo to USB cable and restore the radio ready for operational use.
PAGE 20
Back to Menu Replacing the Interface Module WARNING Dangerous Voltage Ensure the input ac and dc supplies to the radio are disconnected before removing the top cover. WARNING Dangerous Voltage Do not remove the radio’s top cover for at least one minute after switching off the radio. Caution ESDs This equipment contains devices sensitive to electrostatic discharge.