| Make | Model | Problem | Solution | Date |
| | | |
| Found: 4551
|
| Philips | GR1AX | Pic & sound int blank out esp on chan change | IC7470 TDA2579B/N1 timebase chip | 14-09-04 |
| Philips | GR1AX | Picture fails for a short time. | Diode 6542 (BYD33D) dry joint.
| 14-09-04 |
| Philips | GR1AX | Poor H.T regulation and intermittent over voltage tripping. | D6629 (BZX79-B6V2; 4822 130 34167).
| 14-09-04 |
| Philips | GR1AX | poor line sync | C2501 ( 10uF ) | 14-09-04 |
| 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 | 14-09-04 |
| Philips | GR1AX | Power supply does not oscillate. | Check C2613 (33nF; 4822 121 42489) on leakage.
| 14-09-04 |
| 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 | 14-09-04 |
| Philips | GR1AX | Power supply not working. | Check D6610 for short-circuit (BZX79-C10; 4822 130 61219).
| 14-09-04 |
| Philips | GR1AX | Power supply tripping. | 95 volt line pulsing.
Check/replace R3614 - 6.8k (4822 053 11682) in chopper driver
coupling circuit.
| 14-09-04 |
| 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 | 14-09-04 |
|
|
| 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 | 14-09-04 |
| 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 | 14-09-04 |
| 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 | 14-09-04 |
| Philips | GR1AX | Reluctant start from cold - no 95v HT | OK if set HT pot reduced - Zener 6638 BZX79-B36 in HT sensing leaky | 14-09-04 |
| 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. | 14-09-04 |
| 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
| 14-09-04 |
| Philips | GR1AX | Replacing the EAROM | Replacing the EAROM
-------------------
The memory IC IC7785, X2402 has been replaced by ST24C02CP
(4822 310 31886).
Together with the ST24C02CP change-over, the 5 volt supply has to
be adapted: L5786 has to be connected between pin 8 of IC7785 and
R379 | 14-09-04 |
| Philips | GR1AX | Search jumps on UHF. | Check/replace R3788 (2M2; 4822 116 81682).
| 14-09-04 |
| Philips | GR1AX | Search tune won't stop & sound slow to come on when chan changed | Ident signal from micro perm low - Tr7046 BC558 s/c | 14-09-04 |
| Philips | GR1AX | Service information correction. | Service information correction.
-------------------------------
In Service Information GR1-AX 91.02, 4822 727 18934 (GB), chapter 7
the replacement code for the U943/PHONO is not correct.
This should be 4822 210 10452. | 14-09-04 |
| Philips | GR1AX | Servicing the Philips GR1-AX Chassis | See TV Mag May 1994 | 14-09-04 |
| Philips | GR1AX | Set dead due to action of over-voltage-protection circuit. | If thyristor 6641 is disconnected, the set starts up. Disconnect
T7100 and see if the set comes on, if so suspect T7100
(4822 130 40947) or a fault on the 9 volt rail, probably an audio
fault. If the audio output IC7103 is disconnected, the set starts
| 14-09-04 |
| Philips | GR1AX | Set fails to start-up from standby mode, or at cold temperature. | Change C2058 from 33 uF to 47 uF 100V (4822 124 42085).
REMARKS :
The cure is applicable for sets produced in week 9041-9047.
| 14-09-04 |
| Philips | GR1AX | Set goes accidentally into hotel mode. | The hotel mode will be activated if the set is on program 38 and if
"store" and "program +" are pressed simultaneously. However this can
also happen when "program -" and "program +" are pressed instead.
To block this possibility: interrupt the copper trac | 14-09-04 |
| Philips | GR1AX | Set goes into Stand-by | Check/replace C2631 (22nF; 4822 122 40606)
| 14-09-04 |
| Philips | GR1AX | Set is intermittently not coming on, especially from cold. | High Tension coming up to normal voltage but there is no line
drive.
Check start up pulse to line osc IC - pin 11 of IC 7020.
If OK, check to see if line drive appears for an instant at switch
on, on pin 26.
If so, check on base of line output transist | 14-09-04 |
| Philips | GR1AX | Set switches to stand-by | Check/replace C2631 (22nF; 4822 122 40606)
| 14-09-04 |
| Philips | GR1AX | Set will not come out of standby | Check/replace the EPROM, IC7785 (ST24C02CP; 4822 209 62098)
| 14-09-04 |
| Philips | GR1AX | Shuts once in a while and goes to stand-by. | Check C2631 (22nF; 4822 122 30103) on leakage.
| 14-09-04 |
| Philips | GR1AX | Slow start up fropm cold with no OSD | TR7765 (BC548) s/c between B-E, C2523-68uF | 14-09-04 |