QT-CD250H/W SERVICE MANUAL No. S3017QTCD250H QT-CD250H(S) QT-CD250W(S) • 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. • Note for users in U.K. Recording and playback of any material may require consent which SHARP is unable to give.
QT-CD250H/W SAFETY PRECAUTION FOR SERVICE MANUAL Precaution to be taken when replacing and servicing the Laser Pickup. The AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class I Requirements. However, the following precautions must be observed during servicing to protect your eyes against exposure to the Laser beam.
QT-CD250H/W FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. IMPORTANT SERVICE NOTES (QT-CD250H FOR U.K. ONLY) Before returning the unit to the customer after completion of a repair or adjustment it is necessary for the following withstand voltage test to be applied to ensure the unit is safe for the customer to use. Setting of Withstanding Voltage Tester and set.
QT-CD250H/W NAMES OF PARTS Illustration: QT-CD250W 1 2 3 4 5 6 7 9 8 33 34 36 37 38 39 35 40 32 10 14 15 11 12 16 13 30 17 VOLTAGE SELECTOR AC 220V - 240V 31 18 AC 110V - 127V 19 11. 12. 13. 14. 15. 16. 17. 18. 19. 10. 3 11. 3 12. 13. 14.
–5– ■ ■ ● QT-CD250H for customers in Australia and New Zealand 1 3 4 To an AC socket 2 6 or similar) Headphones ■ 5 1 TUNER ■ AC 110V - 127V Turning the power ON and to STAND-BY ● Batteries are not included.
–6– REPEAT BAND 3 5 4 PLAY / PAUSE TUNING FM To stop recording 3 1 Tune in to the desired station. STOP TUNING 5 Recording from CDs Aerial adjustment 3 ■ 2 4 Listening to the radio TUNER AM 1 PLAY / PAUSE TUNING Label side up. 6 2 TUNER After use TUNER 2 7 1 REPEAT BAND TUNER 3 4 PLAY / PAUSE TUNING To stop recording 8 6 5 4 or dust accumulate on the pickup, clean it using commercial cleaning disc (brush type.) ● Do not touch the Laser pickup lens.
QT-CD250H/W FM/AM INTERVAL (SPAN) (For QT-CD250W Only) Before using the unit, be sure to set it for the AM tuning interval (span) used in your area. To check the tuning span currently selected: 1 Set the function switch to TUNER. 2 Press the REPEAT/BAND ( ) button to select the AM band. ● If “AM 531 kHz” is displayed, it means that the radio has been adjusted for a 9 kHz span. If “AM 530 kHz” is displayed, it means that the radio has been adjusted for a 10 kHz span.
QT-CD250H/W 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 to be removed when disassembling the unit.
QT-CD250H/W TAPE MECHANISM SECTION (A1) x1 ø2x7mm (A1) x1 ø2x3mm Hook (A2)x2 Perform steps 1 to 6 of the disassembly method to remove the tape mechanism. (See page 8.) How to remove the record / playback and erase heads (See Fig. 9-1.) Record/Playback Head Erase Head 1. Remove the screws (A1) x 2 pcs., to remove the record/ playback head. 2. Remove the hooks (A2) x 2 pcs., toward the center position as shown in Fig. 9-1. and then extract the erase head upward.
QT-CD250H/W ADJUSTMENT • AM IF/RF (For QT-CD250H) Signal generator: 400 Hz, 30%, AM modulated MECHANISM SECTION • Driving Force Check Torque Meter PLAY: TW-2412 Frequency Frequency Display AM IF 450 kHz 1,620 kHz T3 AM Band Coverage — 522 kHz (fL): L4 *3 1.0 ±0.05V 603 kHz 1,404 kHz (fL): L3 (fH): TC1 Test Stage Specified Value Over 120 g • Torque Check Torque Meter Specified Value Play: TW-2111 25 to 65 g.cm Fast Forward: TW-2231 60 to 130 g.cm Rewind: TW-2231 60 to 130 g.
QT-CD250H/W A. CD TEST MODE Set the function switch to "CD" when pressing the "REVIEW(PRESET DOWN )" button together with "STOP(TUNING DOWN)" button. Step-1. CD Pickup can be move when press the "CUE" button either "REVIEW" button. "CUE" button : CD Pickup move to out side of disc. "REVIEW" button : CD Pickup move to in side of disc. (CD Pickup can't move any more, if reach to most in side.
QT-CD250H/W B. TUNER TEST MODE Set the function switch to "TUNER" when pressing the "REVIEW(PRESET DOWN )" button together with "BAND(REPEAT)" button. The LCD displays indicate the "TunEr" for several seconds. after that, the LCD displays indicate to the normal frequency. PRESET. NO QT-CD250H QT-CD250W (9kHz span) QT-CD250W (10kHz span) FM MODE P-01 FM 87.50 MHz FM 87.50 MHz FM 87.5 MHz STEREO P-02 FM 108.00 MHz FM 108.00 MHz FM 108.0 MHz STEREO P-03 FM 98.00 Hz FM 98.00 Hz FM 98.
QT-CD250H/W D. VOLUME TEST MODE Set the function switch to "POWER ON (TAPE PLAY, TUNER or CD)" when pressing the "REVIEW(PRESET DOWN )" button together with "PLAY/PAUSE (TUNING UP)" button. The LCD display do not indicate the VOLUME level at this time. But, the VOLUME level is "12" which is defaults level. The VOLUME LEVEL can be change when press the "VOLUME UP" button either press the "VOLUME DOWN" button.
QT-CD250H/W SW810 3.8V R826 220K C842 0.047 +B 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 RES C807 0.047 +B CF4 FM DET C108 820P SW102 RECORD/ PLAYBACK 9 8 7 R P SW102-C C112 330P 16 17 18 L108 R P CHOKE R110 COIL SW102-G 120 C106 0.0018 IN2 NF2 0.6V 11 C110 270P NC 4 GND 6 12 7 3.2V C118 10/16 C114 47/16 C116 0.018 (ML) R114 8.2K R116 3.9K R118 3.9K 4.4V R879 4.7K R865 47K 4.5V (TUN: 0.5V) R62 1K R60 1K R61 1K XOUT XIN GND(AUDIO) C54 0.022 C56 0.022 C59 0.01 R77 3.
QT-CD250H/W FM SIGNAL 2.5V SEG10 2.5V 2.3V 2.3V GND 5.0V 2.5V 2.4V 5V 5V GND GND 2.2V(TUN:0V) GND 2.1V(TUN:0V) SEG7 2.5V SEG6 2.5V SEG5 2.5V SEG4 2.5V SEG3 2.5V SEG2 SEG1 2.5V COM3 COM1 COM2 MVDD 2.3V DVSR GND 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 NC R825 10K 2.3V 4.4V (TUN:0V) SEG8 2.5V COM4 MVSS MXI HOLD MXO REMO-IN NC NC RESET LO DVSL RO DVDD 17 DVRR 80 XVDD 5V 16 SEG9 2.5V R842 22K R844 22K C864 0.
QT-CD250H/W SPEAKERS R-CH 1 2 3 4 CNP101 R354 Q351 R351 C352 R228 C233 CNP602 C234 R201 D203 ZD201 D202 C203 R811 IC801 BI802 1 R802 BI801 R853 Q802 C807 25 30 E C B 12 13 H TO SP202 (R-CH) FW801 CD CONTROL PWB-A2 R3 TC1 C12 R2 C1 C3 C21 C20 C22 CF4 C16 C71 C72 R72 R16 R71 C25 C24 C53 CF3 C14 VD2 C23 10 15 1 2 3 3 2 1 CF2 CF1 C15 3 2 1 R10 VD3 C8 C56 L51 C19 BL R17 1 D1 T3 5 13 12 B C E F1 1 IC1 20 C34 Q1 1 2 3 C33 24 R4 R20 C60 R52 C55 R18
QT-CD250H/W TAPE RECORD/PLAYBACK HEAD(240-4) M601 TAPE MOTOR (240-6) SW601 TAPE MAIN (240-7) (241) (241) WH RD BK ERASE HEAD (240-5) TERMINAL B PWB-A6 BK BATTERYS DC4.5V ["AA" SIZE(UM/SUM-3, R6 or HP7)battery x 3] CNS101 WH 1 BK 2 3 RD 4 BK OR BR BK (241) OR TERMINAL A PWB-A5 RD QT-CD250W ONLY (230) (229) BL BATTERYS DC9 V [ "D" size(UM/SUM-1, R20 or HP2) battery x 6 ] OR RD SW651 VOLTAGE SELECTOR AC220V-240V AC110V-127V F651 T1.
QT-CD250H/W 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.
QT-CD250H/W WAVEFORMS OF CD CIRCUIT NO DISC FOCUS SEARCH 1 STOP FO+ FO- SEL TRO 2 FMO 3 PLAY CUE 6 1 TEI 1 TRO 2 FMO 3 IC802 64pin SBAD 11 2 IC802 67pin RFO 15 3 IC802 71pin IC801 22pin STOP PLAY REVIEW 6 1 FEI TEI 1 TRO 2 FMO 3 IC802 64pin IC802 62pin RFGO 11 2 IC801 19pin IC802 67pin RFRP 15 3 IC801 17pin IC802 71pin STOP TEI PLAY TCD-782 TNO-02 PLAYBACK 16 1 IC802 64pin LO 1 RO 2 IC802 86pin TRO 2 SBAD 3 IC802 67pin 7 1 IC802 71pin
QT-CD250H/W 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-CD250H/W • Laser failure. Is +7.5V applied to the Collector of Q206 ? Check the PWB pattern of Q206. No Yes Is +5V applied to the collector of Q204 and Q806 ? Check the PWB Patten of IC204 and Q806. No Yes Is +5V applied to the pin 75 (VDD) and pin 96 (MVDD) of IC802 ? Yes No Check the PWB pattern between collector of Q806 and pin 75 of IC802, and emiter of Q806 and Q804 and pin 96 of IC802. No Check the PWB pattern between collector of Q204 and pin 1 of IC801.
QT-CD250H/W • Focus servo sawtooth wave failure. Is sawtooh wave output to the pin 66 (FOO) of IC802 ? No IC802 is faulty. Yes 1.5~2.5sec Check the PWB pattern of IC803. Is +7.5V applied to the pins 1 and 30 (VCC) of IC803 ? No Yes Check the PWB pattern of IC803. Is sawtooth wave obtained between pins 20 and 21 of IC803 ? No Yes 1.5~2.5sec Is sawtooth wave obtained between pins 3 and 4 of BI801/ CNS801 ? (as shown above) Check the PWB pattern between BI801/CNS801 and IC803.
QT-CD250H/W • Track search failure Does the sled motor run in FF/REW state when the CD TEST MODE is set? No Check as stated in item "SLED MOTOR OPERATION FAILURE". Yes Is the following wave output to the pin 67 (TRO) of IC802 during track search in normal playback? No IC802 failure. Yes TRO Is the following wave output to the pins 12 (TEO) of IC801 during track search in normal playback? No Yes TEO TEI Check the PWB pattern between pin 67 (TRO) of IC802 and pin 28 of IC803.
QT-CD250H/W FUNCTION TABLE OF IC IC51 VHiLC72121/-1: Electronic Tuning (LC72121) (1/2) Pin No. Port Name Terminal Name Input/Output Function 1 Xtal XIN Output Crystal oscillator connection.(4.5 MHz/7.2 MHz) 2 Ground VSSX Output Ground terminal for the crystal oscillation circuit system of LC72121. 3 Chip enable CE Output High level when inputting serial data (DI) to LC72121 or sending serial data (DO).
QT-CD250H/W IC51 VHiLC72121/-1: Electronic Tuning (LC72121) (2/2) Pin No. Terminal Name Port Name Input/Output Function 15 Local oscillation, Signal input AMIN Input Serial data input: AMIN is selected when DVS = 0 is set. When serial data input SNS = 1 is set: Input frequency is 2-40 MHz. Signal is sent to the swallow counter directly. Dividing number to be set is 272- 65535. The actual dividing number is the same as the setting value. When serial data input SNS = 0 is set. Input frequency is 0.
QT-CD250H/W IC1 VHiTA2104BN-1: FM /AM IF MPX.
QT-CD250H/W IC802 VHiTC9457F2-1: Servo/Signal Control (TC9457F2) (1/4) Pin No.
QT-CD250H/W IC802 VHiTC9457F2-1: Servo/Signal Control (TC9457F2) (2/4) Pin No. Port Name 30 31* (S12)P4-1 (SO/S11/ SDA)P4-2 (SCK/SCL) P4-3 DI DO Input Output CL Output 33 34 35 36 37 38 TEST0 TEST1 TEST2 TEST3 TEST4 TEST5 TEST0 TEST1 TEST2 TEST3 TEST4 TEST5 39* 40* 41* 42* (OT19)/HSO (OT20)SPCK (OT21)SPDA (OT22)COFS CE_(PLL) STB_(VOL) P_MUTE X-BASS 43* DOUT NC Input/Output Digital output pin. 44* SBSY NC Input/Output Subcode block sync output pin.
QT-CD250H/W IC802 VHiTC9457F2-1: Servo/Signal Control (TC9457F2) (3/4) Pin No. Port Name 63 SBAD SBAD Terminal Name Input/Output Input/Output Subbeam add signal input pin. 64 TEI TEI Input/Output Tracking error input pin. This input is read when tracking servo is on. 65 TEZI TEZI Input/Output Tracking error zero-cross input pin. 66 FOO FOO Input/Output Focus equalizer output pin. 67 TRO TRO Input/Output Tracking equalizer output pin.
QT-CD250H/W IC802 VHiTC9457F2-1: Servo/Signal Control (TC9457F2) (4/4) Pin No. Port Name 91 /HOLD 92 Terminal Name Input/Output Function HOLD Input This pin is used to input a signal that requests or clears the hold mode. Normally, use this pin for CD mode select signal input or battery detection signal input. There are two hold modes: clock stop mode (crystal oscillator turned off) and a wait mode (CPU stopped). These modes are entered by executing the CKSTP and WAIT instructions, respectively.
QT-CD250H/W PARTS GUIDE MODEL QT-CD250H(S) QT-CD250W(S) “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-CD250H/W NO. PRICE RANK PARTS CODE DESCRIPTION IC1 IC51 IC101 VHITA2104BN-1 VHILC72121/-1 VHIBA3311L/-1 J J J IC201 IC202 IC801 IC802 IC803 VHITA8227P/-1 VHITC9260P/-1 VHITA2109F/-1 VHITC9457F2-1 VHILA6541D/-1 J J J J J AQ FM/AM IF MPX.,TA2104BN AN Electronic Tuning,LC72121 AK REC./P.B.Equalizer Amp., BA3311L AH Power Amp.,TA8227P AN Electronic Volume,TC9260P AL Servo Pre Amp.
QT-CD250H/W NO.
QT-CD250H/W NO.
QT-CD250H/W NO. 249 250 251 252 253 254 255 601 602 603 604 605 606 607 610 PRICE RANK PARTS CODE JKNBZ0042SJSA MLEVP0003SJZZ CHLDZ1003SJZZ PSPAI0001SJZZ TLABS0003SJZZ TLABS0004SJZZ QCNWN0223SJZZ XUBSD30P18000 XUBSD25P10000 XUPSD25P08000 XUBSD30P10000 XUBSD30P12000 XUPSD25P08000 XWHSD28-08120 XHPSD20P03000 J J J J J J J J J J J J J J J DESCRIPTION NO.
QT-CD250H/W 306 701 A 304 701 B 704 302 702 C 301 303 D 703x2 E M702 F 305 M701 305x2 G SW702 H PWB-B 1 2 3 4 Figure 5 CD MECHANISM EXPLODED VIEW –5– 5 6
QT-CD250H/W 217 206 205 237 216 215214 213 212 211 A 223 605x2 203 222 249 231 240(240-1, 240-2, 240-3, 240-4, 240-5 240-6(M601), 240-7(SW601)) B 604 603x2 204 605x2 202 204-1 239 204-2 204-3 238 235 251 604x4 C 610 TAPE MECHANISM 254 PWB-A7 606 Silicon Grease Q206 603 PWB-A1 243 210 PWB-A2 606 SW810 233 232 Silicon Grease D 250 253 602 602x3 604 603x6 225 242 236 LCD801 CD MECHANISM 607x3 227 605x2 SO651 252 208 247 605x2 252 603x4 255 T651 228 220 234 E
QT-CD250H/W PACKING METHOD (QT-CD250H FOR U.K. ONLY) • Setting position of switches and knobs Tape Mechanism Control STOP STATE FUNCTION SELECTOR OFF/TAPE 13 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. Polyethylene Bag, Unit Operation Manual AC Power Supply Cord Packing Add., Left/Right Remote Control Packing Case Polyethylene Bag, AC Power Supply Cord Feature Label Top Pad, Packing Case Bar Code Label VJ No.
QT-CD250H/W —MEMO— –8–
QT-CD250H/W COPYRIGHT © 2000 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.
