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QT-CD250

CONTENTS

Page

IMPORTANT SERVICE NOTEST (FOR U.S.A. ONLY) .................................................................................................... 2

SPECIFICATIONS ............................................................................................................................................................. 2

NAMES OF PARTS ........................................................................................................................................................... 3

OPERATION MANUAL ...................................................................................................................................................... 4

DISASSEMBLY .................................................................................................................................................................. 5

REMOVING AND REINSTALLING THE MAIN PARTS ..................................................................................................... 5

ADJUSTMENT ................................................................................................................................................................... 7

NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 11

TYPES OF TRANSISTOR ............................................................................................................................................... 11

SCHEMATIC DIAGRAM .................................................................................................................................................. 12

WIRING SIDE OF P.W.BOARD ....................................................................................................................................... 14

WAVEFORMS OF CD CIRCUIT ...................................................................................................................................... 16

TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 17

FUNCTION TABLE OF IC................................................................................................................................................ 21

PARTS GUIDE/EXPLODED VIEW

PACKING OF THE SET (FOR U.S.A. ONLY)

• 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.

QT-CD250

SERVICE MANUAL

SHARP CORPORATION

No. S2014QTCD250/

This document has been published to be used

for after sales service only.

The contents are subject to change without notice.

Summary of content (36 pages)

PAGE 1
QT-CD250 SERVICE MANUAL No. S2014QTCD250/ QT-CD250 • 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 NOTEST (FOR U.S.A. ONLY) .................................................................................................... 2 SPECIFICATIONS .......................................................................................................................................
PAGE 2
QT-CD250 FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. IMPORTANT SERVICE NOTES (FOR U.S.A. 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.
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QT-CD250 NAMES OF PARTS 1 2 3 4 5 6 7 8 9 13 14 15 10 11 25 26 27 28 29 16 12 17 18 19 20 21 22 23 11. 12. 13. 14. 15. 16. 17. 18. 19. 3 10. 3 11. 12. 13. 3 14. 3 15. 3 16. 17. 18. 19. 24 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 3 31. 3 32. 3 33. 3 34. 35. 36. 3 37. 38.
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–4– TUNER OFF 1 TUNER POWER 2 ● Label side up. ● Con el lado de la etiqueta encarada hacia arriba. 3 6 5 POWER ■ Volume control ■ Control del volumen ● Batteries are not included. ● Las pians no están incluidas.
PAGE 5
QT-CD250 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.
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QT-CD250 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 5.) How to remove the record / playback and erase heads (See Fig. 6-1.) 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. 6-1. and then extract the erase head upward.
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QT-CD250 ADJUSTMENT • AM IF/RF Signal generator: 400 Hz, 30%, AM modulated MECHANISM SECTION • Driving Force Check Torque Meter PLAY: TW-2412 Frequency Frequency Display AM IF 450 kHz 1,720 kHz T3 AM Band Coverage — 530 kHz (fL): L4 *3 1.0 ±0.05V 600 kHz 1,400 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.
PAGE 8
QT-CD250 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.
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QT-CD250 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 U.S.A. FM MODE P-01 FM 87.5 MHz STEREO P-02 FM 108.0 MHz STEREO P-03 FM 98.0 MHz STEREO P-04 FM 90.0 MHz STEREO P-05 FM 106.
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QT-CD250 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.
PAGE 11
QT-CD250 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.
PAGE 12
QT-CD250 SW810 1.9V F 0.5V 8 9 10 11 SEL 0V 2200P 3.8V R826 220K C807 0.047 IC101 BA3311L 0V IN2 NF2 0.6V 11 9 C112 330P C108 820P 9 8 7 R P SW102-C 16 17 18 R P SW102-G R108 R110 1K 120 C106 0.0018 C110 270P NC 4 GND 6 4.4V R879 4.7K R865 47K R62 1K R60 1K R61 1K 3.2V C118 10/16 R114 8.2K R116 3.9K R118 3.9K XOUT XIN GND(AUDIO) CE AOUT AIN PD R53 4.7K VSSA VSSX DI CL DO C56 0.022 C59 0.01 R77 3.3K C54 0.
PAGE 13
QT-CD250 FM SIGNAL SEG7 2.5V SEG6 2.5V SEG5 2.3V 2.3V GND 5.0V 5V 2.5V 2.4V 5V 5V GND GND GND SEG4 2.5V SEG3 2.5V SEG2 SEG1 2.5V 2.3V 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 R882 47K 11 10 9 9 7 7 6 6 5 5 4 4 1 1 2 2 R899 47K 3 8 8 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 +B 10 11 11 FW802 9 10 CNP801 1 2 3 4 R856 15K +B +B 8 9 X802 4.19MHz C851 3.3/50 12 11 10 3 R901 47K R863 1.8K R860 4.
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QT-CD250 SPEAKERS R-CH 1 2 3 4 CNP101 R354 Q351 R351 R107 C107 C112 C108 C110R108 C119 R110 R102 R118 R120 C114 C118 C122 R116 R114 C106 R122 C116 R106 C352 R228 C233 C249 3 2 1 C237 C234 B C E Q204 C851 R860 R850 R811 IC801 BI802 R802 BI801 R805 C804 R853 C839 C838 C835 C834 R820 IC803 R852 CNS801 1 20 Q802 C807 25 30 E C B WH GY GY GY GY GY D804 R851 1 8 7 6 5 4 3 2 1 COR1 C821 R806 R828 C827 R827 C826 5 6 1 10 WH WH WH WH WH WH WH BK C806 C856 R865 R877
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QT-CD250 TAPE ERASE HEAD (240-5) M601 TAPE MOTOR (240-6) (241) (241) WH RD BK SW601 TAPE MAIN (240-7) RECORD/PLAYBACK HEAD(240-4) TERMINAL B PWB-A6 BK BATTERYS DC4.
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QT-CD250 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 IC
PAGE 17
QT-CD250 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.
PAGE 18
QT-CD250 • 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.
PAGE 19
QT-CD250 • 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.
PAGE 20
QT-CD250 • 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.
PAGE 21
QT-CD250 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).
PAGE 22
QT-CD250 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.
PAGE 23
QT-CD250 IC1 VHiTA2104BN-1: FM /AM IF MPX.
PAGE 24
QT-CD250 IC802 VHiTC9457F2-1: Servo/Signal Control (TC9457F2) (1/4) Pin No.
PAGE 25
QT-CD250 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 (N/C) Input/Output Digital output pin. 44* SBSY (N/C) Input/Output Subcode block sync output pin.
PAGE 26
QT-CD250 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.
PAGE 27
QT-CD250 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.
PAGE 28
QT-CD250 —MEMO— – 28 –
PAGE 29
QT-CD250 PARTS GUIDE MODEL QT-CD250 “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 .......................
PAGE 30
QT-CD250 NO. PRICE RANK PARTS CODE DESCRIPTION X801 X802 INTEGRATED CIRCUITS 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.
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QT-CD250 NO.
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QT-CD250 NO.
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QT-CD250 NO. PRICE RANK PARTS CODE DESCRIPTION ACCESSORIES QACCU0001SJ00 TINSE0040SJZZ TLABZ SJZZ RRMCG0023SJSA ! J J J J J AR AC Power Supply Cord AC Operation Manual Label,Feature AU Remoto Control Battery Lid,Remoto Control P.W.B.
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QT-CD250 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
PAGE 35
QT-CD250 217 206 205 237 235 216 215214 213 212 211 A 223 605x2 203 222 202 235 231 604 240(240-1, 240-2, 240-3, 240-4, 240-5 240-6(M601), 240-7(SW601)) B 603x2 204 605x2 204-1 204-2 238 204-3 232 239 610 C D Silicon Grease PWB-A1 Q206 243 210 PWB-A2 CD MECHANISM 607x3 603 602x3 603x6 604 242 LCD801 606 233 606 TAPE MECHANISM Silicon Grease SW810 PWB-A7 604x4 605x2 605x2 236 SO651 208 603x4 245 220 234 E PWB-A4 219 207 604x7 601x2 SP201 604x4 PWB-A5 201
PAGE 36
QT-CD250 PACKING OF THE SET (FOR U.S.A ONLY) • Setting position of switches and knobs Tape Mechanism Control STOP STATE FUNCTION SELECTOR OFF/TAPE Polyethylene Bag, Unit SSAKH0001SJZZ Operation Manual AC Power Supply Cord Packing Add., Left/Right SPAKA0036SJZZ L Feature Label Polyethylene Bag, AC Power Supply Cord SSAKK0002SJZZ Top Pad, Packing Case SPAKZ0013SJZZ FR ON T Remote Control R FR ON T FR ON T Packing Case SPAKC0112SJZZ Bar Code Label TLABR1098SJZZ VJ No.