| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Philips | GR1AX | Repeat failure of line output transistor item 7528 | After fitting a new transistor Type 2SC3795B Pt. No.4822 130 60676 check soldered connections to socket M3 | ||
| Philips | GR1AX | Repair-tip power-supply | Repair-tip power-supply ----------------------- It is not allowed to connect a measuring probe to the gate of MOS-FET transistors TS7610 because the set will not function well, or the MOS-FET might be damaged. | ||
| Philips | GR1AX | Reluctant start from cold - no 95v HT | OK if set HT pot reduced - Zener 6638 BZX79-B36 in HT sensing leaky | ||
| Philips | GR1AX | Programs and PP-settings cannot be changed | It may happen that when switching on from standby the set comes on in "store lock" mode (sometimes called "hotel mode"). In this mode stored settings for programme selection and personal preference cannot be changed (see operating instructions for leavin | ||
| Philips | GR1AX | Programme tuning difficulty, stations shifted on the tuning bar. | Stations appearing to the right of the usual position on the tuning bar although the bar itself scans normally. Higher channels may not be accesssible at all. Investigation has shown that although the 33V supply and the pulse drive from pin 1 of IC7700 | ||
| Philips | GR1AX | Production change to line drive | Production change to line drive ------------------------------- A production change has been introduced to the line drive circuit. Receivers affected are factory coded SV008921 and higher. Reason: To improve the function of the line drive circuit. Pos | ||
| Philips | GR1AX | Production change to +9V supply | Production change to +9V supply ------------------------------- A production change has been introduced to the +9 volt supply. Receivers concerned are factory coded SV008921 and higher. Position Old New Code No. 3100 | ||
| Philips | GR1AX | Power supply tripping. | 95 volt line pulsing. Check/replace R3614 - 6.8k (4822 053 11682) in chopper driver coupling circuit. | ||
| Philips | GR1AX | Power supply not working. | Check D6610 for short-circuit (BZX79-C10; 4822 130 61219). | ||
| Philips | GR1AX | Power supply faultfinding | Power supply faultfinding ------------------------- The power supply in the GR1-AX delivers approximately 33 watts on the +95V line to run the set. Clearly the practice of using a 60 watt 240V lamp as a load during fault finding cannot be applied in this | ||
| Philips | GR1AX | Power supply does not oscillate. | Check C2613 (33nF; 4822 121 42489) on leakage. | ||
| Philips | GR1AX | Poor reproduction of copy protected tapes | It is possible that reproduction of some VCR tapes will be adversely affected by anti copy signals which are recorded on the video tape during the sync. period. A significant improvement can be achieved by applying the following modification: Position | ||
| Philips | GR1AX | poor line sync | C2501 ( 10uF ) | ||
| Philips | GR1AX | Poor H.T regulation and intermittent over voltage tripping. | D6629 (BZX79-B6V2; 4822 130 34167). | ||
| Philips | GR1AX | Picture fails for a short time. | Diode 6542 (BYD33D) dry joint. |