QT-CD131/131C SERVICE MANUAL No. S8870QTCD131/ QT-CD131 QT-CD131C Illustration: QT-CD131 • In the interests of user-safety the set should be restored to its original condition and only parts identical to those specified should be used. CONTENTS Page IMPORTANT SERVICE NOTES (FOR QT-CD131 ONLY) ................................................................................................ 2 SPECIFICATIONS ....................................................................................................
QT-CD131/131C FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. IMPORTANT SERVICE NOTES (FOR QT-CD131 ONLY) BEFORE RETURNING THE AUDIO PRODUCT (Fire & Shock Hazard) Before returning the audio product to the user, perform the following safety checks. 1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the audio product. 2.
QT-CD131/131C NAMES OF PARTS 2 1 1. Cassette Compartment 2. CD Compartment 3. (TAPE) Record Button: 4. (TAPE) Play Button: 5. (TAPE) Rewind Button: 6. (TAPE) Fast Forward Button: 7. (TAPE) Stop/Eject Button: / 8. (TAPE) Pause Button: 3 5 4 9. FM Stereo Mode Indicator: ST 10. FM Stereo Indicator: 11. Band Indicator: FM/AM 12. Memory Indicator 13. Preset Number Indicator 14. Frequency Indicator 15. (CD) Play Indicator: 16. (CD) Repeat Indicator: 17.
QT-CD131/131C DISASSEMBLY Caution on Disassembly Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure excellent performance: 1. Take cassette tape and compact disc out of the unit. 2. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit. 3. Take off nylon bands or wire holders where they need be removed when disassembling the unit.
QT-CD131/131C (G2)x1 Switch PWB Tuner Display PWB Push Front Cabinet Driver (D1)x2 ø3x12mm (G1)x2 ø3x10mm Rear Cabinet (D1)x1 ø3x10mm (G1)x1 ø3x10mm Figure 5-1 Terminal PWB (E1)x4 ø3x10mm (G1)x2 ø3x10mm Figure 5-3 Rear Cabinet (F1)x3 ø2.5x10mm Pull Tape Mechanism (C2)x2 (H1)x1 (H1)x1 Top Cabinet CD Mechanism (C2)x1 Pull Battery PWB Figure 5-2 Figure 5-4 REMOVING AND REINSTALLING THE MAIN PARTS CD MECHANISM SECTION (A1) x2 2.
QT-CD131/131C ADJUSTMENT TUNER SECTION MECHANISM SECTION fL: Low-range frequency fH: High-renge frequency • Driving Force Check Torque Meter Specified Value PLAY: TW-2412 • FM RF Signal generator: 1 kHz, 75 kHz dev., FM modulated Over 120 g • Torque Check Torque Meter Test Stage Frequency Frequency Display Specified Value Play: TW-2111 25 to 65 g.cm 87.5 MHz 60 to 130 g.cm Band Coverage — Fast Forward: TW-2231 Rewind: TW-2231 60 to 130 g.cm RF 90.0 MHz (10~30 dB) 90.
QT-CD131/131C CD SECTION Since this CD system incorporates the following automatic adjustment function, when the pickup is replaced, it is necessary to reajust it. Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted. TEST MODE Start Note Operation While holding down the "STOP" button, move the FUNCTION/POWER switch to "CD". Then, release the "STOP" button and, within 0.5 second, connect the TEST POINT to GND (within 0.5 second). (See Fig. 7) 1.
QT-CD131/131C NOTES ON SCHEMATIC DIAGRAM • Resistor: To differentiate the units of resistors, the symbol as K and M are used: the symbol K means 1000 ohm and the symbol M means 1000 kohm and the resistor without any symbol is an ohm resistor. The resistor designated "Fusible" is a fuse type resistor • Capacitor: To indicate the unit of capacitor, a symbol P is used: this symbol P means micro-micro-farad and the unit of the capacitor without such a symbol is microfarad.
24 27 28 30 31 34 35 36 SEG1 VLC3 38 VDD 25 9 ~ 14 17 ~ 19 21 20 +5V (D) PU-IN SW SL+ 13 SL– 14 SYSTEM MICROCOMPUTER IC701 IX0105AW LID 37 23 33 22 ~ 60 41 ~ 44 COM3 SEG4 57 PICKUP IN SW702 Figure 9 BLOCK DIAGRAM (1/3) –9– M702 SLIDE MOTOR M701 SPIN MOTOR TRACKING COIL FOCUS COIL PICKUP UNIT M M 17 18 26 27 11 12 1 2 30 31 1 2 3 4 SL– SL+ FIN2 FIN1 E F 62 64 IC801 LA9240M SERVO AMP.
L-CH Figure 10 BLOCK DIAGRAM (2/3) – 10 – ERASE HEAD R-CH REC / PB HEAD FROM CD/DISPLAY SECTION 7 6 SW102-H REC / PB SW102 REC / PB B.D REC / PB SW102 C,E P.B P.B MUTE (POWER GND) R-CH 1 (AUDIO GND) 2 CD L-CH 3 +7.4V 4 +B2 5 (DIGITAL GND) BIAS OSC. REC P. B SW102-G REC / PB 8 6 R 12 9 R IC101 EQULIZER AMP. BA331IL L 1 5 L C201 L201 REC REC P.
F1 B.P.F 1 FM RF 3 VD1 FM ROD ANTENA L1 L4 AM OSC. 4 5 6 FM IF T1 VD3-2 VD3-1 7 Q1 IC1 TA7358AP FM FRONT END VT TC1 FM OSC RF AMP. L2 L3 8 VD2 AM ANT. VT 9 FM+B CF1 X1 4.
QT-CD131/131C A +B R842 C848 22 1/50 5V 0V 0V 0V 0.4V 5V 3.1V 1.5V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 0V 0V 0V SWITCH PWB-A2 1 2 3 4 5 6 7 8 9 10 1112 13 14 15 16 E R828 1K R829 1K R812 C813 15K 0.1 R815 47K VREF R839 22K GND CL CLK DEF DRF CE DAT REFI VCC2 FSS VR LF2 PH1 BH1 R817 82K R822 R823 6.8K 1.2K C814 R816 0.01 1.5K R840 22K R833 5.6K R832 56K R8 33 R836 R 47K 4 C832 27P R835 C 470 0.
+B F E B A K C802 47/16 1 2 3 4 5 6 7 8 TRTR+ FO+ FOGND PD VR LD TR+ FO+ FOTR+ FO+ FO– TR– TR– PICKUP UNIT +B +B C868 R874 10/16 100 C870 0.0022 R876 10K C867 10/16 R873 100 LVDD 36 35 34 DOUT TEST3 1 2 3 4 5 6 7 8 BI801 TR+ TR– FO– FO+ 44 43 42 41 40 LCHO 37 C2F EMPH CONT5 CONT4 CONT3 CONT1 CONT2 1 2 3 4 5 6 7 8 B F XL801 16.
QT-CD131/131C A B C105 0.0018 IC101:REC./P.B.EQUALIZER AMP. R105 15K 2 2 3 3 4 4 SW102-B P R C107 820P C109 270P P R107 1K 3 NF1 5 IN1 C111 330P 9 C108 820P R P R108 1K SW102-D C106 0.0018 D C110 270P 4 11 ALC T 2 OUT2 GND 6 7 12 C118 10/16 R116 3.9K D103 1N4148 ON OFF SW203-B X-BASS C123 100/10 X-BASS SW203-A ON OFF R125 680K R106 15K C354 0.0056(ML) R218 22K P R122 2.7K C152 TAPE 0.039(ML) TUNER CD R152 SW201-B 2.2K R124 3.3K R P R351 330 R352 150 C351 0.
QT-CD131/131C HEADPHONES PWB-A4 MAIN PWB-A1(2/3) R227 120 R228 120 J201 HEADPHONES 1 5 R151 2.2K FW202 C221 0.001 C215 0.039(ML) VR201-A 20K 1 C223 100/10 R219 3.3K 4 R220 3.3K 11 C224 100/10 C216 0.039(ML) C225 220/25 VR201-B 20K C218 0.0039 – + 3 C220 0.047(ML) R222 1K 6 C222 0.001 152 9(ML) C232 0.1(ML) 9 7 5 D201 1N4148 52 2K +B IN 1 OUT 3 8V 2 0V 3 R-CH D652 1N4004 C651 0.022 C654 0.022 T601 POWER TRANSFORMER C653 0.
3 4 Figure 16 SCHEMATIC DIAGRAM (5/6) – 16 – 5 C5 0.01 +B 4 C3 4.7P 6 C8 15P C14 0.022 FM IF T1 R70 22K L3 AM ANT. AM SIGNAL FM SIGNAL AM BAND COVERAGE L4 AM OSC. C51 C52 10/16 0.022 7 9 R8 47K R6 680 C11 22P (CH) C19 18P(UJ) C18 0.022 VD3-2 KV1581A C17 0.047 R9 100K Q1 2SC1674K RF AMP. VD3-1 KV1581A TC1 20P R56 47 VD2 KV1360NT C9 33P(CH) R4 10 C10 24P(UJ) 8 AM TRACKING fL fH FM BAND COVERAGE R3 33K VD1 KV1360NT 5 C15 C16 0.022 0.022 R1 22 C7 0.001 +B C6 0.
10 Figure 17 SCHEMATIC DIAGRAM (6/6) – 17 – 11 10 9 8 7 6 5 4 3 2 1 10 9 8 7 6 5 4 3 2 1 CNS501 BI501 BACK UP +B MONO/STEREO MUTE TUNED STEREO GND(D) PLL(PERIOD) PLL(DATA) PLL(CLOCK) +7.3V P16 5 - A TO MAIN PWB CNP501 R525 R523 1K 10K R521 10K SW501 BAND SW502 TUNER DOWN R519 1K R518 3.3K R517 5.6K +B +B C501 10/16 R501 220 R502 560 R503 560 R504 560 D501 1N4148 C502 0.022 D502 1N4148 SWITCH PWB-B2 SW506 PRESET DOWN R524 3.3K SW505 PRESET UP R515 8.2K R516 5.6K 1 4 R505 2.
QT-CD131/131C HEADPHONES PWB-A4 C351 P.
QT-CD131/131C SPEKERS SP502 R-CH SP501 L-CH COLOR TABLE CNS201 SW601 TAPE MAIN (241-7) BR 1 WH 2 BK 3 RD M601 TAPE MOTOR (241-6) TAPE ERASE HEAD (241-5) RED OR ORANGE YL YELLOW GR GREEN BL BLUE VL VIOLET GY GRAY WH(W) WHITE BK BLACK PK PINK RD BK BR WH YL RECORD/PLAYBACK HEAD(241-4) BROWN RD(R) BK CNS101 4 3 2 1 BK WH RD BK BK (211) T601 POWER TRANSFORMER TERMINAL PWB-A3 + BATTERYS DC12V ["D"size(UM/SUM-1, R20 or HP2)battery 8] YL C653 D653 (236) YL D652 RD C652
QT-CD131/131C TO MAIN PWB CNP501 CNS501 1 2 3 4 5 6 7 8 9 10 BR BK BK BK BK BK BK BK BK BK A C510 C509 10 1 R504 L502 R501 ZD501 D504 C502 D502 4 FW501 R502 C501 D501 1 B R503 BI501 D503 C513 IC502 C503 3 2 1 C506 C C507 R506 C511 C512 C505 Q501 21 E C B R505 65 R514 C504 R507 D505 R513 64 R529 15 10 80 D 5 R508 R509 55 75 IC501 5 1 D506 60 70 R510 50 10 Q502 R511 40 35 15 B C E 41 45 30 20 1 XL501 R512 24 25 L501 R528 LCD501 C508 C530 R527 R5
QT-CD131/131C WAVEFORMS OF CD CIRCUIT 1 2 5ms 0.50 V IC801 20 F.E 5ms 5.0 V IC801 54 DRF STOP FOCUS PLAY SERCH 50ms 10.0 V JP+ 7 50ms 10.0 V JP- 8 50ms 0.50 V JP 9 50ms 1.00 V TE 6 0.5ms 10.0 V JP+ 7 0.5ms 10.0 V JP- 8 0.5ms 0.50 V JP 9 0.5ms 1.00 V TE 10 20ms 1.00 V SPO 11 20ms 2.00 V CLV+ 10 50ms 1.00 V SPO 11 50ms 2.00 V CLV+ 3 1 3 6 CUE 0.5ms 1.00 V HF 1 4 0.5ms 5.0 V HFL 5 0.5ms 5.0 V TES 3 0.5ms 1.00 V H.F 4 0.5ms 5.0 V HFL 5 0.5ms 5.
QT-CD131/131C TROUBLESHOOTING (CD SECTION) When the CD does not function When the CD section does not operate When the objective lens of the optical pickup is dirty,this section may not operate.Clean the objective lens,and check the playback operation.When this section does not operate even after the above step is taken,check the following items. Remove the cabinet and follow the troubleshooting instructions.
QT-CD131/131C • Playback can only be performed when a disc is loaded. No Check the laser diode driver. Check the area around IC801(16) - (21) (focus servo circuit). No If the disc is not turning, the DRF should not change to "H". Is the Focus servo active? (Can you hear it working?) Yes ▼ Yes Does the DRF signal change from "L" to "H"? Check the spin system. Yes Yes No Level is abnormal. ▼ Is HF waveform normal (see the Fig. 23-1, 2)? Yes Check the periphery of IC801 pins 41 and 42.
QT-CD131/131C • Checking the spin system. Play operation is performed without disc. Yes The spin driver circuit is normal. The turntable rotates a little. Yes No The turntable fails to rotate or rotates at high speed. Yes Check the periphery of IC801 pins 23 to 27, pin 39 and pin 40, IC802 pin 12 and pin 13, IC804 to BI803/CNS803. • Checking the VCO-PLL system Play operation is performed when disc exits. Yes Although HF waveform is normal, TOC data cannot be read. Yes Check PDO waveform (Fig. 24).
QT-CD131/131C FUNCTION TABLE OF IC IC701 RH-iX0105AWZZ (IX0105AW): System Control Microcomputer Pin No. Terminal Name Port Name Input/ Output Function 1* P03 MTCONT2 Input/Output Used to input or output 4 bits at a time. When the output latch is set to "1", the unit will be in the input mode. The key-on wakeup function, which can be switched on or off by the software, and a pull-up transistor, which can be turned on or off by the software, are built in.
QT-CD131/131C —MEMO— – 26 –
QT-CD131/131C PARTS GUIDE MODEL QT-CD131 QT-CD131C “HOW TO ORDER REPLACEMENT PARTS” To have your order filled promptly and correctly, please furnish the following information. 1. MODEL NUMBER 2. REF. No. 3. PART NO. 4. DESCRIPTION For U.S.A. only Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call Toll-Free; 1-800-BE-SHARP MARK: SPARE PARTS-DELIVERY SECTION Explanation of capacitors/resistors parts codes Capacitors Resistors VCC ..............
QT-CD131/131C NO. PRICE RANK PART CODE DESCRIPTION INTEGRATED CIRCUITS VHITA7358AP-1 VHILA1805//-1 VHITC9216P/-1 VHIBA3311L/-1 J J J J AG AM AL AK IC202 IC203 IC501 VHILA4597//-1 VHIKIA7808P-1 RH-IX0003SJZZ J J J AH AH BA IC502 IC701 VHIPST9142/-1 RH-IX0105AWZZ J J AH BA IC801 IC802 IC804 VHILA9241M/-1 VHILC78623D-1 VHIBA5914FP-1 J J J AS AY AN FM Front End,TA7358AP FM/AF IF MPX.,LA1805 PLL,TC9216P REC./P.B.Equalizer Amp., BA3311L Power Amp.
QT-CD131/131C NO.
QT-CD131/131C NO.
QT-CD131/131C NO.
QT-CD131/131C 306 701 A 704 304 701 302 B 702 C D 301 303 703x2 E M701 F 305 M702 305x2 G SW702 H PWB-C 1 2 3 4 Figure 5 CD MECHANISM EXPLODED VIEW –5– 5 6
QT-CD131/131C 203 213 601x3 A 215 212 242 240 PWB-A3 C ONLY 236 B 247 T601 601x2 211 602x6 PWB-B3 221 PWB-B4 231 214 243 SO651 601 603 230x2 202 C PWB-A5 603 603x2 603 601 PWB-A4 232-1 241 (241-1, 241-2 241-3, 241-4, 241-5, 241-6, 241-7) 232 D 232-2 222 601 x2 228 227 226 225 229 250 245 SW761 223 601 x3 249 606 246 224 603x4 233 LCD501 607x2 608 603 E 248 PWB-B2 CD MECHANISM Silicon Grease 605x3 604x3 F 603x4 IC203 607 PWB-B1 244 IC202 201 607 PWB-A
QT-CD131/131C PACKING OF THE SET (FOR QT-CD131 ONLY) • Setting position of switches and knobs Tape Mechanism Control STOP STATE TUNING LOW POWER/FUNCTION OFF/TAPE X-BASS OFF VOLUME LOW AC Power Supply Cord Polyethylene Bag, Unit SSAKH0001SJZZ Packing Case SPAKC0014SJZZ Feature Label FR ON T Operation Manual FR ON T Packing Add.
QT-CD131/131C —MEMO— –8–
QT-CD131/131C COPYRIGHT © 1998 BY SHARP COPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any from or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.
