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CTV990113 TELEVISION TECHNICAL BULLETIN
Month of Issue: January 1998 Classification: White Page 1 of 2
MODELS
51CS03H 59CSD8H
51CS05H 66CS03H
59CS03H 66CS05H
59CS05H 66CSD8H
Symptom Dead no sound or vision) Q701 & Q601 failed
Possible Remedy
*
Q601 failed Q601 s/c and failure of audio o/p stage
No voltage at Q701 drain NICAM LED on or flashing (aerial disconnected)
D609, D610, D720, D718, Q702, Q703, C601, C604, C619, C714, C708, R706, R707, R720 and inspect scan coils and scan coil socket for bad connections. D609, D610, C601, C604, C619 and inspect scan coils/scan coil socket for bad connections. Q601 failed due to missing - 16V rail (supply to o/p stage). Leave Q601 out of circuit until you have confirmed that both the +16V and the -16V rails are correct. Technical Bulletin CTV970201 (Issued Feb 97) See flowchart on page 2
HT rail present, no line drive, NICAM LED switches on for Check R611 and IC201 3-6 seconds then goes off (ariel disconnected) Keeps switching to standby Check audio output stage for a short circuit HT rail missing-unsolder pin 2 of 0V Power supply not running (check CTV is not in LOPTX and measure the HT rail standby mode 20V-40V Short on one of the secondary LT supply rails e.g. audio o/p stage 110V-150V Short circuit on line o/p stage Line drive pulsating IC401 not communicating with micro Line drive pulsating and R628 (R634 in later Q704 (low standby/sound 5V rail) models) burning Slow start up i.e. more than 3-6 seconds for C714 (please ensure that this is replaced with the line oscillator to start depending on model specified part) Audio Problems Intermittent sound Whistle on the Audio (later models only) Distorted sound
Technical Bulletin CTV970203 or CTV980204 Damage print feeding 40V to R368 IC301 (MSP3410)
Vertical O/P Stage Faults No or intermittent vertical output Failure of vertical output stage Intermittent frame cramping Rainbow effect (no line pulses at IC501 pin 2) Rainbow effect and R628 (R634 in later models) open circuit
Technical Bulletin CTV970207 (Issued Feb 97) Technical Bulletin CTV970202 (Issued Feb 97) & check Q507/8/9 Replace D501, D502, D507, D512, C506 & C507 C501 R631 or R632 fusible resistors
Originator AvW Supervisor
Sharp Electronics (UK) Limited Approval Date / / Revision 1
Reference AVW120199/2
White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units
CTV990113 TELEVISION TECHNICAL BULLETIN
Symptom Possible Remedy
Month of Issue: January 1998 Classification: White Page 2 of 2
Other Problems East West correction Blank raster and flyback lines when hot Blank raster ( no sandcastle pulse) Tuner drift
Check D605, D612, D619, D621 & R628 (R634 in later models) Technical Bulletin CTV970204 (issued Feb 97) D602 Technical Bulletin CTV970806 (Issued Feb 97)
Notes 1. 2. 3. 4. 5. 6. 7. D609 & D610 may not read faulty. Q601, IC201 & C601 are different devices in the 51cm than the larger models. Before replacing IC201 ensure that 8V is present on all three supply pins (22,23 & 53) The value of R706 in the 59CS05 & 66CS05 models is 0.33ohm. CTV must be tuned to CH69 and receiving a signal before the IF PLL (ACF) is carried out. For alternative 45V and Audio Mute circuits (??CS)3H models only) refer to ??CSO5H service manual. Some exchange PWB will have a single 4 pin socket instead of two 2 pin sockets for the loudspeaker connections. Carefully trim the two 2 pin plug to enable them to fit into the single 4 pin socket.
* These parts except for R707 & R720 are available as a kit. Part numbers are: 51 cm models 59/66cm models 51 CSCHASSISKIT 59 CSCHASSISKIT
Originator AvW Supervisor
Sharp Electronics (UK) Limited Approval Date / / Revision 1
Reference AVW120199/2
White Carry out as required, Yellow Carry out as required and whenever the unit comes in for service, Red Carry out on all units