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CTV990113 TELEVISION TECHNICAL BULLETIN
Month of Issue: January 1998 Classification: White Page 1 of 2
Symptom Dead no sound or vision) Q701 & Q601 failed
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
White â Carry out as required, Yellow â Carry out as required and whenever the unit comes in for service, Red â Carry out on all units