PHILIPS GR1AX Service Manual

RTV servis Horvat

Tel: ++385-31-856-637
Tel/fax: ++385-31-856-139
Mob: [phone]

www.rtv-horvat-dj.hr

PHILIPS

ŠASIJA

GR1AX

Line transistor T7528 defect (4822 124 40754).
1: A defective line transistor T7528 can be caused by a defective C2523 (6.8µF/50V). To prevent reoccurance,
replace C2523 with a 68µF/63V capacitor, code number 4822 124 40754.

Line end stage does not function UB is present - 5V is present - D6058 u6030 C 2058 R 3058 ok.
1: Check C2523.

Failures in the power supply.
1: In the event of a failure in either R3616, R3680, R3614, MOSFET 7610 or D6610, it is recommended that all five
components should be replaced. During finding do not connect any probe to the gate of the MOSFET 7610 to
measure voltages and waveforms as this would disturb the normal operation of the device resulting in its damage or
complete failure.
Check/replace:
TS 7610 (BUK 444-500B; 4822 130 61676) D 6610 (BZX79-C10; 4822 130 61219)
R 3616 (1 Ohm; 4822 052 11108) R 3680 (1 Ohm; 4822 052 11108)
R 3614 (6.8 kOhm; 4822 053 11681). 2: Check D6613, R3100, IC7103 and Set dead.

Set dead.
Restriction: for sets with serial no. SV.. only. If thyristor 6641 is disconnected, the set starts up.
1: [Due to action of over-voltage-protection circuit]. Disconnect T7100 and see if the set comes on, if so suspect
T7100 (4822 130 40947) or a on the 9 volt rail, probably an audio .
2: [Due to action of over-voltage-protection circuit]. If the audio output IC7103 is disconnected, the set starts up.
Check if IC7103 (4822 209 60956) or the loudspeaker is defective.
3: [95V line low at 15V]. Cause of the was in the chopper driver
transistor's base circuit, where C2618 (27nF) O/C. It is of the blue plastic block type.
4: [Line output transistor TR7528 (2SC3795) S/C]. Replace TR7528 and check C2523 (6.8uF/63V) for O/C.
5: Check D6613 (15V), D6610 (10V) and D6644 (1N4148) for leaks; line output transistor for S/C and check
microcontroller chip TMP47C4323559.

Set dead. Power supply tripping.
1: 95 volt line pulsing. Check/replace RR3614 - 6.8k in chopper driver coupling circuit.
REMARKS:
This component may have been strained or failed after a FET failure.

Slow start up of power supply.
1: Replace zener diode D6613 (15V).

Line transistor 7528 blows within 1 sec.
1: Check if IC7020 (TDA8305) gives output. If not, replace IC7020
REMARKS :
Code numbers of line transistor:
BUT11AF 4822 130 42679 BUT12AF 4822 130 43919.
2: Check the small 3.3µH choke L5519 which is in series with the output from the chip (IC7020).

Intermittent dead.
1: Transistor 7521 base loose.(dry joint).
2: L5524 a small coil which filters the supply to the line driver stage is O/C.
3: [95V HT supply OK]. Check C2523 (6.8uF).

No +9V, line output stage is OK.
If no +9V starting voltage, check D6523 for open circuit. (4822 130 61219).

Power supply not working.
Check D6610 for short-circuit (BZX79-C10; 4822 130 61219).

Power supply does not oscillate.
Check C2613 (33nF; 4822 121 42489) on leakage.

Dead, 95V line low at 15V

MREŽA

1: Cause of the was in the chopper driver transistor's base circuit, where C2618 (27nF) O/C. It is of the blue plastic
block type.

tripping
1: TDA7052 sound output chip.

No voltage from PSU. +5A present.
1: Check TS7610, TS7614, TS7629, D6610 and D6613. If TS7610 is defective also replace diodes 6610, 6613 and
check R3616 and R3680 with the ohmmeter.

No voltage from PSU, computer does not work. +300V present but not +5A.
1: Trip circuit has reacted. Operate with 70V input voltage (variable isolating transformer). If +95V remains below
95V, it is present. in the voltage control. Check TS7628, TS7614, diode 6614 and R3627/3629. If +95V is still not
present, remove diode 6638 and switch on with 70Vpp. Now +95V is almost present. Replace diodes 6638, 6639 and

6640.

Line output stage only starts up for a short time, 95V is present.
1: Check electrolytic 2523 which has a loss of capacity.
2: Check start circuit for line oscillator. Consists of diodes 6058 and 6030, electrolytic 2058 and resistor 3058.
NB: These parts are at the control input for the volume. 3: Check coil L5524 (1.5mH) in the +9V line for O/C.

PSU repair tip.
Warning: Please do not test on the mains switching transistor! (field effect). May be destroyed. An incandescent lamp
is unsuitable as a dummy load. Perhaps PSU does not start up.

Dead.
1: Check 12V zener diode D6030 O/C. 2: Check sound chip and zener diode.
3: From a visual check fuse 1600 2A is "black". Joints of thyristor 6641 (SF2D41) between anode and cathode S/C
and at a following test also diode 6642 S/C. Replace both components.
4: Line output transistor S/C, also line output transformerfaulty. On replacing transistor it blows again after a few
mins, check L5519 (3.3uh) choke for shorted turns.
5: Check if D6638 is S/C, +94V line, if low check C2618 O/C. 6: [95V very low]. Check D6671 (BZX79-F4V3).
7: [PSU ok, no 95V and 9V]. Check TR7100 (BC558A), safety resistor R3100 (1R) and IC7103 (TDA7052).
8: [No 95V]. Check D6638 (BZX79-B36) for S/C.
9: [No line drive]. Check D6030 (12V zener), D6523 (1N4148) and L5524 for O/C.
10: [No output from chopper]. Check D6610 (BZX79-C10). 11: Replace R3610, R3513 and D6610 (10V).

No function. Standby LED flashes briefly. 95V and 5V present. Only 4.5V in 9V line.
1: [Replaced audio IC. No result]. TDA8305 is defective causing TR7521 to remain in conduction. 7523 is not driven
preventing line oscillator from starting to oscillate. Replace IC.

Appliance is dead with whistling noise coming from power supply.
1: Check for leaky BUT11AF line output transistor, replace and fix any dry joints in the line driver stage.

Appliance is dead with standby LED flashing after a few seconds.
1: Check line output transistor. 2: Check 15V zener diode D6613.

HT varies and sound intermittently goes to max.
1: Replace C2631 (22nF) at the base of standby switching transistor (Tr7631)

Dead, HT low, 9V rail at 5V. 1: Line output transformerfaulty.

HT goes high. 1: R3627 (33K) goes high in value in the regulation stage.

Dead, HT correct.
1: Several possibilities here. C2519 (150pF) at pin 26 of TDA8305 or the 12V zener (D6030) in the kick-start circuit
associated with pin 11 could be faulty. Check D6523 (1N4148) in line driver start-up supply.

Low 5V to micro chip. 1: D6644 (1N4148) in the power supply is faulty.

Intermittent dead with HT line at 8V. 1: D6613 (15V zener) in the power supply.

Appliance comes on intermittently.

1: Replace C2058 (22mF.100V) in the kick-start circuit associated with the TDA8305 chip.

Dead after 2 hours.
1: [HT present]. Replace D6523 (1N4148), TR7251 and TR7523 (both usually BC337) and change C2523 (6.8uF) to
68uF/63V. Any one of these components can cause this .
2: Check line scan coil connector for dry joints.

Failure of R3616, R3680, Tr7610 or D6610 in power supply.
1: In the event of failure of any of these components, all must be replaced. Do not connect any probe to the "Gate" of
Tr7610, or it will be destroyed.

No power supply, blank screen only. 1: Check C2044 (4mF).

Dead. LED flashes after a few seconds.
1: Check line output transistor, if ok check D6613 (15V zener diode).

SOPS defective.
1: If one or more of following components are defective, replace all: R3616, R3618, TS7610 and D6610. It is
important not to touch gate of TS7610 (mosfet) with any probe while checking for s as this could cause mosfet to
become defective.

Set dead with no 95V output from the power supply.
1: The over-voltage thyristor fired when the ht reached 50V with the mains input fed via a variac. One of the sensing
zener diodes, D6638 (BZX79-B36), in the thyristor's gate network was leaky.

Set dead with ht low at 10V.
1: The sound output chip was s/c. Also the BYX79C15 zener diode D6613 was leaky. For the power supply to start
there must be 15V across this diode.

Set dead with ht low at 5V.
1: The set was stuck in the standby mode. Checks showed that the microcontroller chip's reset line was pulsing. Zener
diode 6671 (BZX79-F4V3) was the cause.

No power supply start up in loaded condition (eg. with lamp).
1: Start up power supply in unloaded condition. This now supplies 95V. Now charge with lamp (e.g. 100W). Power
supply should now function.

No output from the chopper power supply which uses a junction FET, whose gate and source are at 12V while 300V is
present at the drain.
1: Check zener diode D6610 (BZX79C10). For tuning drift change the ZTK33B voltage stabiliser.

Set dead no output from the power supply.
Set dead no output from the power supply. 1: Check D6638 (BZX79C36) for S/C. It is one of the sensing zener diodes.

Set dead with just 5V on the 95V line. Standby LED is on but set won't start.
1: Check D6671 (BZX79-F4v3) zener diode.

Set dead. Line oscillator not working. 1: Check 12V zener diode D6030 for O/C.

Set dead, no HT supply.
1: Check zener diodes D6638/39/40 and thyristor THY6641 in the overvoltage protection circuit. D6638/39 are usally
36V types and D6640 30V but check in the relevant service manaul. THY6641 is type SF2D41.

Dead, output transistor s/c. 1: Replace choke L5519 (3.3µH).

Dead, no line oscillation. 1: Check D6030 [12V zener] for o/c and C2044 (4µF) for s/c.

Intermittently appliance is dead and remains in standby. 1: Check C2631 (22nF).

Appliance is dead or intermittent. 1: [+9V is low]. Check C2523 (6.8µF).

Random breakdown of line output transistor. 1: Check Tr7521 and Tr7523.

Unregulated power supply. Pulsating picture and surging sound. 1: Replace 2523.

No quick start pulse. 1: 3680 slightly high.

No 9V. 1: 3680 slightly high.

No regulation. 1: 3680 slightly high, ie. 8.2ohms.

No SOP supply. EHT OK.
[refer to service info SI 009/90].
1: Replace IC7020. 2: Replace 2631. 3: Replace 8.8MHz crystal.

Quick hiccup.
1: 7785 memory IC is faulty.
2: 2102 has the wrong value.A 0.33µF/100V has been fitted, change to 3.3µF/50V.

Only 90V, B+, hiccups 112V=90V. Picture narrows. 1: Replace 6614 due to S/C.

Power supply squealing. 1: Check 8.8Mhz crystal.

Slow hiccup
1: Dry joint, S7020 and power supply. 2: 5V line down to 3.5V. 7673/6671 leaky.

Dead power supply after fitting the SBC7020 kit.
1: Check that a solder bridge has not been created between the anode of 6670 and one end of 6669. Great care must be
taken when fitting SMDs, they are easily damaged by heat and easy to create solder bridges causing S/C.

Trips intermittently at switch on.
1: Check D6638, D6639, and D6640. All three should be 36V.

No switch on. Low noise on sound.
1: Choke 5524 O/C. 2: If switches on after a while, replace C2523 (6.8uF).

Appliance is dead, low level buzz from loudspeaker. 1: [9V low at 5.5V]. Check choke L5524 for o/c.

Appliance is dead, slight grunting noise. 1: Check L5524 (1.5mH).

Trips intermittently at switch on. 1: Check D6638, D6639, and D6640. All three should be 36V.

No switch on. Low noise on sound.
1: Choke 5524 O/C. 2: If switches on after a while, replace C2523 (6.8uF).

Appliance is dead, low level buzz from loudspeaker.
1: [9V low at 5.5V]. Check choke L5524 for o/c.

No start up. 1: Replace electrolytic capacitor (6.8µF/50V) near the high voltage transformer.
2: [No short measured at line transistor]. Check audio amplifier TDA7052.

Trips at switch on.
1: Check overvoltage sensing zener diodes D6638, D6639 and D6640; if OK check R3100 (1R).

Dead, just buzzing. 1: [No feed to TR7521 and TR7523]. Check L5524 for O/C.

Voltage +92,5 is only 2V. C2523 6,8uF/40V. Replace with 68uF.

U743 tuner replacement.
The U743 UHF tuner has been replaced by the U943. In all applications it is a direct replacement. Where the
substitution was made during production some components, being no longer required, were deleted at the same time.

KORISNE INFORMACIJE

This means that in some chassis the tuners are not reverse compatible ie. a U743 cannot be fitted in place of a U943
without first refitting components concerned with the +12V supply to pin 10 of the U743 tuner. The list of changes are
as follows:

Old tuner: U743-Phono 482221010339 New tuner: U943-Phono 482221010452
Removed: C2004 Connector 9087 Connector/coil 9510/5000.

Up and protection with hotel mode.
Note: The existing code numbers for the up are being recoded to code number 4822 310 31947 (up and protection)
without hotelmode. If it happens that a customer especially wants the hotelmode this is available under 4822 310
319822 (up and protection).
/V models always have hotel mode.
Note: /R and /B models may appear with or without hotel mode. Appliances with a /V- behind the model number have
always had the hotel mode feature (since production). The only difference concerns the microprocessor, for code
numbers see additional information under 4822 310 31982.
New hotel mode.
Note: A new hotel mode has been introduced since production code PM09 and ZB09. This feature is not mentioned in
the instruction manual.
Activate: select pr. 38, set at desired max. vol. press the mode/install button on the local control and, at the same time,
the sleep timer or OSD on the RC until H+ appears (after approx. 3 sec.). After switching to stand by or off position,
the mode is active.
De-activate: As above, except adjusting max. vol., H- appears.
Microprocessors new hotel mode.
Note: Microprocessors new hotel mode code numbers.

-App. with 8 local control buttons: TMP47C434N-R221 4822 209 32192

-App. with 3 local control buttons: TMP47C434N-3142 4822 209 32118
Introduced since production code PM05 and ZB05 (not in SV.. app.)
(Before operation see instructions "New hotelmode".)

Audio demodulator reels.
Only in appliances with the SV serial number, during manufacturing the audio modulator reels (position 5034 and

5045) were replaced : 5034= 4822-157-63742, 5045= 4822-157-63238.

Reset circuit.
In appliances with ZB or PM serial number the reset circuit was changed:
2782: new 4u7 4822-124-41577 3741: new 10k 4822-116-52233
9025: plug in bridge has been removed.
Reason for insertion: adaptation for appliances which could not be switched on with a lower mains voltage.

Service manual correction.
There are no coils and no connection between pin 5 and pin 1 of the line transformer (5530). The coils are between pin
10 and pin 1 of the transformer.

UHF tuner U743
With all "Only UHF" appliances (-/05) tuner U743 (4822 210 10339) was replaced by a U943/Phono (4822 210

10454).

New microprocessor IC7700.
A new microprocessor without "Hotel mode" was inserted. 7700= TMP47C434N-3537 (4822 310 31947).
For appliances with SV serial number: Insertion calender week 9140
(9142 for LFL-manufacturing);
For appliances with PM/ZB serial number: Insertion calender week 9150.
This microprocessor is supplied including the screen.

Tuner UV617/PH
Tuner UV617/PH was replaced by the UV917E/Phono. Also replaced were the following components:
In appliances with SV-serial number:
a) 3000: Resistor 5M5 ohm (soldered in between pin 22 of IC7020 and pin 11 of the tuner). Adjusted to avoid "picture
foldover" when switching channels. Fitted Calender week 9129.
b) 3704: Replaced by a 100R to avoid minimum tuning voltage. Fitted: Calender week 9126.
In appliances with ZB or PM serial number:
a) 3065: Replaced by 6M8 ohm (soldered in between pin 22 of IC7020 and pin 11 of the tuner). Adjusted to avoid
"picture foldover" when switching over channels. Fitted in Calender week 9129.

b) 3704: Replaced by 100R as an adjustment for the minimum tuning voltage. Fitted in Calender week 9126.
c) 2711: Replaced by 100nF to improve the tuning on channels 21 and 51. Fitted in Calender week 9126.
d) 3751: 27k added (between pin 16 of IC7700 and the earth) as an adjustment to avoid "picture foldover" when
switching channels. Fitted Calender week 9129.

Drive circuit for the line deflection transformer.
Only in appliances with SV serial number. Three important changes were made.
a) Capacitor 2521 was removed and diode 6520 was added in position 2521, antiparallel to diode 6521.
Reason: Improved performance of the line deflection transistor TS7528 (2SC3795). Fitted Calender week 9138.
b) Two bridges were removed and two Z diodes were added. Z diodes BZX79C12 (6031 and 6032).
Reason: To clear switching noises when changing brightness. Fitted Calender week 9134 (9138 for LFL
manufacturing)
c) Capacitor 2058 and resistor 3058 were replaced. 2058: by 47uF, 3058 by 100R.
Note: Both components must be replaced at the same time. Reason: Improved performance of the line deflection
transistor TS7528 (2SC3795B). Fitted Calender week 9122.

Connection of the loop system to the TV.
Note: A problem usually occurs when connecting a loop system to a modern TV. A solution is available from the
hearing aid suppliers in the form of a specific loop system amplifier which is supplied from the mains and which
functions with a scart or phono plug signal. On the advice of a specialist a large part of the cost is usually covered by
insurance.

Microprocessor screening plate.
Note: Connect the screening plate on IC7700 on the side of pin 1/42 with the earth surface where C2790 and C2715
are also connected.

Spare part information.
1: In service manual "GR1-AX Version 2" the specific parts list for the /58R is not m entioned. For this /58R use parts:
position 1000: tuner UV917E/Phono; service code 4822 212 23696 postions 1600, 2606, 3603, 6602, 6603, 6604,
6605, 7610, 7614: use service codes of the /52R set. All other positions: use service codes of the /59R set.

Power-supply repair tip.
Note 1: It is not recommended to connect a measuring probe to the gate of MOS-FET transistors TS7610 because the
set will not function well.
Note 2: The power supply won't run with a 60W or 100W bulb as a dummy load. When there is no in the power
supply it will run and produce a the correct HT voltage, when the HT smoothing coil L5660 is disconnected to give an
off-load condition.

Production change to +9V supply.
A production change has been introduced to the +9 volt supply. Receivers concerned are factory coded SV008921 and
higher.
Pos. Old New Code No.
3100 IR0 IR5 (safety) 4822 116 80676 3646 - 150R 4822 116 52211
C2110 - 470nF 4822 121 51252 T7100 - BC558 4822 130 40941
Note: This information is supplementary to that given in the service manual. It is not intended as a service
modification.

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. Old New Code No.
R3059 2K7 1K0 4822 050 11002 R3520 47R 33R 4822 116 52191
R3521 1K6 4K7 4822 116 52283 R3525 9R1 15R 4822 053 11159
R3527 13R 15R 4822 053 11159 D6521 - BYD33D 4822 130 42488
C2521 - 10nF 4822 122 33307
Note: This information is supplementary to the service manual and is not intended as a modification to be applied.

Housing parts.
The code number of a casing part may vary depending on the cabinet colour and country of origin. The serial number
prefix for Singapore is SV and for Italy PM. The list of differences, where they occur, is given below.
Item Description & Code numbers
SV PM
4 Back cover (black) 4822 438 10277/ 4822 438 10274

4 Back cover (white) 4822 438 10286/ 4822 438 10289
19 Cabinet (black) 4822 430 10259/ 4822 430 10253
19 Cabinet (white) 4822 430 10263/ 4822 430 10268
26 Mains knob (black) 4822 410 60155/ 4822 410 60155
26 Mains knob (white) 4822 410 60271/ 4822 410 60405
27 *Text plate (black) 4822 454 12396/ 4822 454 61172
27 *Text plate (white) 4822 454 12402/ 4822 454 12436
27 +Text plate (black) 4822 454 12403/ 4822 459 61172

RC handset 4822 218 20886 / 4822 218 20886
*Non remote control sets only +Remote control sets only.

Control micro processors.
A production change has been introduced adding a shield to the control micro processor to prevent the processor being
influenced by external fields. In future, replacements will be supplied as a kit comprising the processor, shield and
fitting instruction. The shield will also be available separately.
Old mask no. Code no.
CP90/110 TMP47C432P
8187 -
8188 4822 209 72038 8189 4822 209 73665

New mask no. Kit code no.
8188 4822 310 31849 8189 4822 310 31851

Replacing the EAROM.
The memory IC in these receivers has been replaced by type ST24C02CP (code no. 4822 209 62098). On some
receivers however, the circuit will have to be modified. G90AE chassis...The ST24C02CP is a direct replacement for
X2402 and no circuit changes are required.
G90B/G110 chassis - all versions...If the ST24C02CP is being fitted in place of an X2402 no circuit changes will be
required. However if the device being replaced is a PCD8582P, the following change must be carried out.

1) Change C2724 (chip capacitor 2.7n) to a chip jumper code no. 4822 051 10008.

2) Delete chip resistor R3729. GR1-AX chassis
When memory IC X2402 is replaced by type ST24C02CP, the 5 volt supply must be modified as described in Service
Tips 216A. For the GR1-AX chassis only, the ST24C02CP is supplied complete with metal shield under code no.
4822 310 31886. The shield must be positioned over the EAROM and soldered in place of link 9020. Note: This IC
contains all the stored settings for channels, programmes and preferred customer settings. Consequently,
when the new IC (EAROM) is installed, the receiver will not be tuned to a programme and customer settings will be
set to minimum. The set may appear dead giving the impression that the new IC is defective. Alternatively some
receivers may be in standby or "store lock" mode at switch-on.
Whenever a new EAROM is fitted the set must be completely reprogrammed with channels and customer preferred
settings.

Correction to service manual LOT winding.
In the service manual of the GR1-AX chassis the circuit of the line output transformer is drawn incorrectly both in
diagram A and the main PCB layout drawings. The +160V winding is shown connected between pins 1 and 5 of the
LOT. This should be shown connected between pins 1 and 6 (the +95V input to the primary). Please amend the
service manual.

Change of C2523.
A production change has been introduced replacing C2523 6.8uF 50V with 68uF 63V (code number 4822 124 40754).
Note: It is possible for a failure of C2523 to result in the consequential failure of T7528 BUT11AF/BUT12AF. It is
therefore recommended that when replacing a failed T7528, C2523 should also be checked and if necessary replaced
with a 68uF.

CRT types.
Some receivers were fitted with a CRT type A34JFQ40X04 in production.
The standardized replacement for all 14" receivers with these chassis is the A34EAC01X45. Spacers may have been
used when mounting the A34JFQ40X04 in the housing. These should be discarded when fitting an A34EAC01X45 in
its place. In addition, the wiring of the deflection coils is different.
Comparison of the connections is included with the new tube. Code no. for A34EAC01X45 is 4822 131 20316.

Hotel mode.

Control microprocessors are available for these chassis with or without the "hotel" mode feature. Original production
included "hotel" mode but the feature was deleted to reduce the number of "nuisance" service calls generated by
misuse of the feature. However, GR1-AX receiver 14GR1221/05V was produced with "hotel" mode. This is indicated
by the suffix V.
Processor H. mode Code no.
TMP4734N/3415 Yes 4822 310 31982 TMP4743N/3537 No 4822 310 31947.

6613 type change.
A production change has been introduced in receivers with serial number starting SV9306 and higher. Diode 6613
BZX79-C15 is changed to BZV85-C15 code no. 4822 130 33732.

Power supply finding.
Note 1: It is not recommended to connect a measuring probe to the gate of MOS-FET transistors TS7610 because the
set will not function well.
Note 2: 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 finding cannot be applied in this case.
Moreover, the cold resistance of any lamp greater than 15 watts is too low to allow the power supply to start up.
Consequently, the use of any lamp as a load cannot be recommended. However, the power supply will run with the
load disconnected at coil L5660 in which case the HT will be approximately 97 volts.

Initial volume-level is higher than the maximum Hotel-Mode setting.
Restriction: Hotel applications only.
* Deactivate the Hotel-Mode. (The procedure is family depending).
* Switch-on the MENU-volume control (via the RC for a 3 local-control set) and adjust the level till a normal low
volume-level.
* Press the "store" buttom. Now the personal preference level PP is set at this low level.
* Adjust the volume-control, without using the MENU, at a higher level than the PP level. This will be the new
maximum level in Hotel-Mode.
* Activate the Hotel-Mode again. (The procedure is family depending).
It is adviced to check the PP level and the maximum Hotel-Mode level.
REMARKS: The problem occures whem the set is switched-on from stand-by and when the PP volume-level is higher
than the maximum Hotel-Mode level. This maximum Hotel-Mode level is only active as soon as the volume-level has
become lower once.

Switching Hotel-Mode on and off.
To switch on Hotel-Mode: select channel 38 and adjust max. desired volume. Press "Store" button and "Channel +"
button simultaneously.
To switch off Hotel-Mode: Select channel 38, press "Store" button and "Control +" button simultaneously.

PSU repair tip.
Warning: Please do not test on the mains switching transistor! (field effect). May be destroyed. An incandescent lamp
is unsuitable as a dummy load. Perhaps PSU does not start up.

To improve performance with prerecorded cassettes.
1: Change C2050 to 47nF, R3050 to 75K, R3051 to 1.5K and C2322 to 1µF.

Adjustment of +95V.
Note: Adjustment of +95V is incorrectly described in documentation. Connect multimeter to + pole of C2660 and
earth. Adjust voltage with R3626 for:

- serial number SV.. to +95V - serial number PM.. and ZB.. 20", 21" to +95.5V.

- serial number PM.. and ZB.. 14" to +100V.

Microcomputers and screening plate.
Increased failure of microcomputers due to static charge on microcomputer casing. Static charge caused by strong
electric field of picture tube. Microcomputer of all appliances must be provided with a metal screening plate.
Desc. Part no.
uP TMP47C434N Mask 3555 4822 310 31848.

Change of line transformer position 5530.
Note: Following change has taken place in line transformer of GR1-AX chassis: pin 1 (+160V) used to be connected
to pin 5 via a winding. Now pin 1 is connected to pin 6 via a winding. This does not affect operation. However this
information is important when measuring on or around transformer. Code no. of position 5530 is unchanged: 4822 140

10369. Please note in chassis documentation 14" and 20".

: 4822 727 18083 : 4822 727 18073.

The following production changes were introduced to prevent the set coming on in the store lock mode when switched
on from standby.
EEPROM IC7785 changed to type ST24C02CP, with a shield, part No 4822 310 31886. L5786 in the 5V supply
connects between pin 8 of IC7785 and R3797 instead of R3770/3767, using a spare print pad adjacent to R3793.
Position the shield over the IC and solder in place of link 9020.

Error messages indicated by front display flashing.
Note: The error is indicated by the LEDs off time, the on time always being 50msec. Messages as follows:
1] F0, LED off time 50msec. Internal RAM - replace IC7700.
2] F1, LED off time 100msec. Internal timer - replace IC7700.
3] F2, LED off time 150msec. EEPROM . Either the EEPROM chip is faulty or the +5B voltage is incorrect.

+9V supply modification.
Production change only, not a service modification.
* Change resistor R3100 from 1ohm to (safety) 1.5ohm.
* Add resistor R3646 (150ohm), capacitor C2110 (470nF) and transistor
T7100 (BC558).

New IR receiver.
Note: TFMS53260 is now supplied for GR1AX. This IR receiver has three connection wires 18mm long. Connections
are: lens directed to U, middle pin closer to left pin. Left 1: earth, middle 2: +5V,
right 3: signal off. New receiver lens located approx in front position on old receiver. Pin 1 new = 3 old, pin 2 new = 1
old, pin 3 new = 2 old.
Code no. 4822 212 30842

The removal of leaded diodes.
Note: Leaded diodes such as 6602, 6603, 6604, 6605 and 6617 have their wires tightly crimped to the print. The best
way to remove them is to cut their wires close to the holes on the top side of the board. Use desoldering braid to
remove the solder an the remainder of the wire.

Replacement of surface mounted diode 6637.
Note: Each diode has its anode and cathode marked with an "a" and a "k". It is easy to confuse diode 6637's cathode
marking with the collector marking of transistor 7656 and end up with a diode fitted back to front.

Hotel mode – sound
Set 38.program. Adjust volume, press store ,keep it, press PROGRAM UP.
Volume is now set to new maximum.
Cleaning : set 38.program, press STORE,keep it, press CONTROL UP

Line tearing and rope effect.
Note: A production change was introduced in week 9236 changing the type of capacitor used in position C2523. The
value and working voltage is unchanged.
Reason: To improve reliability. There is line tearing through the centre of the picture sometimes accompanied by
"rope" or "barbers pole" effect.
:Position Description
:C2523 6µ8F 50V

Vertical vibration in cold condition of the set.
1: Change R 3052 into 1.8 kOhm (4822 116 52249) and change C2053 into 150 nF (4822 121 41854).

No line start-up. Check/replace D6523 (1N4148; 4822 130 30621).

No line start up; +95 available; +9V is about 4.5V.
1: Check/replace C2523 6.8uF (4822 124 41578).
2: Check/replace R3058 470R (0.5W; 4822 116 82258 for sets with production code PM.. or ZB.. 0.6W; 4822 050
24701 for sets with production code SV..)
REMARKS: Initial start-up pulses at pin 26 IC 7020-B, TDA8305, are missing.

OTKLON

Blank raster and no sound after 4 hours or longer. 1: TDA8305 Chip.

Poor line sync. 1: C2051 (10mF.25V) associated with pin 24 of the TDA8305 is faulty.

Intermittent destruction of line o/p transistor.
1: Replace Tr7527 and Tr7523. They are both usually type BC337 but check first.

Poor line and field sync. from cold. 1: Change R3052 from 1K to 1.8K and C2053 from 22nF to 150nF.

Vertically unstable. occurs when cold. 1: Change C2053 to 150nF. Change R3052 to 1K8.

Field collapse.
1: Probably TDA3653B field output chip IC7500 is defective. The picture will be blanked, giving sound but no
picture symptom.
2: [Can be intermittent]. Check scan coil plug and socket for dry joints.

Line tearing, especially with bright scences. 1: Replace C2542 (220uf) and C2060 (680uf).

Very excessive height, non-linearity and field blanking to the extent that only a quarter of the picture is displayed.
These are intermittent s.
1: Check C2043 (82pf) which is intermittently leaky. It is connected to pin 2 of IC7020.

Raster is blank and sound is missing. 1: Check C2044 (4.7µF) pin 10 of IC7020.

Line synchronisation is weak. 1: Check C2051 (10µF) pin 24 of IC7020.

Low horizontal amplitude (after protection disabled by O/C 6560). 1: Replace 7528.

White horizontal line when switching up G2 raster voltage. 1: Plug M4 of the deflection unit is O/C.

No frame or short frame. 1: [May need to turn A1S to see this]. C2504 100mfd.

Excessive non-linear scan, possibly intermittent. 1: Check C2403 (82pF).

Frame roll/bounce. 1: Check/replace C2504 (1000uF/1500uF). Check value.

Defective linearity. Field blanking. Height excessive 1: Check C2043 (82pF).

Field collapse normally with blank picture. 1: Check IC7500 (TDA3653).

Colour dropout when playing back pre-recorded video tapes.
1: When playing back poor quality pre-recorded video tapes, the available chroma burst signal from the recording
may not be sufficient resulting in colour dropout. This can be improved by increasing the chroma sensitivity of the
receiver. The value of C2322 can be changed from 220nF to 1µF (service code 4822 124 40242).

Color intermittent
Restriction: Production Singapore, 1 watt versions
Re-solder RGB ribbon cables (black) between CRT-panel and chassis:
Position number 0051 - PCB GRID E6 on solder side of chassis
Position number 0003 - on the solder side of CRT panel
Position number 0053 - PCB GRID B5 on solder side of chassis
Position number 0001 - on the solder side of CRT panel
REMARKS: New cables introduced in production in week 9241.

No colour.
1: Check C2302 (10nF; 4822 122 33307). 2: Check R3727 (75kohm) for open circuit.

Colours flicker and disappear. Check C2050 (68nF; 5322 121 42465).

BOJA

Green picture. 1: Check T7435 (BF422) on CRT panel. Part no.: 4822 130 41782
2: Check +5A. Check print around T7673.

Loosing colour during play-back of a video tape. Restriction: for production code P.. or ZB..
1: Change C2322 to 820nF (4822 121 51436).

Loss of colour with VCR scan (picture search).
1: Replace C2322 (PT4 IC7300) by electrolytic (1µF). Code no: 4822 124 40242

No colour and a vertical black bar down the screen.
1: Check for a crack in the print from pin 10 of the line output transformer - where the PCB fits into the back cover.

Green screen and at other times no tuning. 1: Replace microprocessor TMP47C434-3559.

Intermittent colour and intermittent dark vertical bar on picture.
1: Check print leading from pin 10 of line output transformer for cracks.

Line tearing in the centre of the picture and occasionally rope effect (vertical lines).
Note: A production change was introduced in week 9236 changing the type of capacitor used in position C2523. The
value and working voltage is unchanged.
Reason: To improve reliability. There is line tearing through the centre of the picture sometimes accompanied by
"rope" or "barbers pole" effect.
Position Description
C2523 6µ8F 50V

After replacement of the line output transistor BUT12, picture with trapezoid effect, BUT12 overheats and goes
defective again.
1: C2523 partially short circuited.

No freeze frame or intermittent freeze frame; no sound.
1: Set switches to stand by after ten minutes. Suspect identification , check pin 22 of IC7020. This voltage should
only be low when no signal is present. If this voltage is low, disconnect T7046 to enable tuning and avoid "sleep"
stand by. Suspect around sync section of IC7020, check/replace C2046 - 22nF off pin 22 first. Code no 4822 122

40606.

No picture and no sound.
1: Power supply does not start up. D6613 is defective. 2: Replace all zener diodes in the PSU.
3: Check if 95V is present. If not then change TS7610, TS7614, TS7629, D6610 and D6613 and check R3616 and
R3680.
4: Replace IC7020 (TDA8305), IC7103 (TDA7052), IC7500 (TDA3653), D6523, TR7521, TR7523, D6058, D6030,
R3100 and tuner.
Note: If you disconnect the +95V on the collector of BUT12, drive signal is missing on the base. The pulse is visible
for a short time at the moment of switch on, on pin 26 of the IC7020. Drive occurs via R3058, C2068, D6030, D6058,
IC7020C, IC7020B, Pin 26 etc.
5: Replace coil 5524, D6523 and 0.125mA fuse (not fitted in all appliances). 6: C2044 (4uF) is S/C.
7: [95V HT supply ok, no line drive]. Check L5524 for open circuit.

Two lines going around. Check/replace C2606 (68 uF; 4822 124 41599).

No picture. OSD OK. 1: [Voltage pin 10 IC7020 too low]. Check C2045 (22nF; 4822 122 30103).

Picture fails for a short time. Diode 6542 (BYD33D) dry joint.

Intermittent loss of pic. 1: C2045 (22nF) in the AGC circuit, connected to pin 10 of the TDA8035 is u/s.

Right side of picture discoloured as if this side is magnetic (e.g. by speaker).
1: [Removed speakers and demagnetized picture tube. No result]. Picture tube defective due to fall. Shadow mask has
come loose or has changed shape.

Intermittently green picture, channels cannot be programmed.

SLIKA

1: Coil S5786 (1OuH) is fitted incorrectly on print (on 5A instead of 5B voltage). Fit coil S5786 as drawn on print
layout. Check IC7785 (X2402) for defects. Part no.: 4822 209 73313 X2402

Interference in picture and sound. Appears to be maltuning. 1: Replace IF IC (TDA8305).

Dim picture with Hanover bars visible.
1: Cause was loss of the sandcastle pulses because zener diode 6326 was s/c. It was type BZX79C12 but other types
have been fitted. This was a version 2 set (serial nos start with SV04).

Sometimes when turned on, green screen only with flyback lines, at other times no tuning and channel w ill not chang e.
1: Check tuning microcontroller chip, type TMP47C434-3559. Its replacment comes with a metal shield to screen it
and the ram. This has to be connected to the chassis.

No picture or sound but RCU works correctly. LED flashes when the handset is tried.
1: The 95V output is low at approx 10V. Check D6613 (BYX79C15) zener diode, also check sound chip for S/C.

No picture, sound ok but on turning up A1 control, frame collapse.
1: Check IC7500 TDA3653B. Check if loose contacts in the mains plug. Also check for dry joints at the scan coil
plug.

No colour and vertical black bar across screen.
1: Check for crack in printed circuit by line output transformer where PCB fits into back. Check track which runs
from pin 10 of line output transformer.

No sound or vision, just a blank screen. 1: Check C2044 (4uf) for S/C.

Lines on picture after approx one hour. It consists of a band of bright white lines about two inches wide.
1: Check C2523 (6.8uf) which decouples the supply to the line driver transistor.

Picture is faint with hanover bars. 1: Check D6326.

Intermittently video drops out. 1: Check C2045 (22nF) on pin 10 of IC7020.

Green picture. Picture OK if cathode of D6761 is disconnected (G/V from micro).
1: No +5B supply to T7765 and T7770 from pin 4 of LOPT. Check R3544 1ohm and D6544 BYD33D. Can also be
caused by a crack in the print between pin 4 of LOPT and R3544.

Bright flash on screen and no picture or sound after a few minutes. 1: 7521/7523 leaky. No horizontal
drive.

Intermittent no picture or sound. 1: 2631 is leaky. 2: Replace 6618.
3: Break in PCB track from 6300 to pin 7 7300. 4: Replace 2502.
5: 6.8µF 63V in horizontal output 2523. 6: 2523 leaky when cold.

Snowy picture and no sound.
1: Replace micro 7700. Part no.: 209 61074. 2: Replace 6614 due to S/C.
3: Break in PCB track from 6300 to pin 7, 7300.
4: No +5VB line. PCB broken, pin 4 of line output transformer and 3544 location D5

Rolling or jittering picture.
1: 5525 is dry jointed. 2: Replace mainspeaker. 3: 2631 leaky.

Bright flash on screen. No picture or sound.
1: Replace 2631. 2: 7020 O/C track pin 26.
3: Dry joints on ribbon cable from CRT board to chassis. 4: Replace 1036.

No picture, TXT OK. 1: 6.8µF 63V in horizontal output 2523.

Blank raster with flyback lines.
1: TDA3565A is defective. RGB output to 7V saturates RGB transistors.

No picture.

1: When the tube's first anode voltage was turned up a blank unmodulated raster appeared. A small brown disc
ceramic capacitor, C2045 (22nF), was leaky. It's in the AGC circuit, connected to pin 10 of TDA8305 jungle chip
IC7020. The readings we obtained were 3kOhm both ways.

Picture and sound are missing, just slight motorboating noise. 1: Check C2048 (2700pF) at pin 23 of
IC7020.

Picture is poor with rippling on verticals. 1: Check C2060 (680uF) on +12A rail.

Smeary, washed out picture with bent verticals. 1: Check smoothing capacitor C2060 (680uF) in 12V
supply.

Only half a picture. 1: [No sandcastle pulse at R3529]. Check print around outer edge of PCB for hairline
crack.

Faint picture. Lines on colour. 1: Check zener D6326 (12V).

The tone (sound) tunes well, but the volume cannot be raised.
1: The loud sound is set to "hotel" function. Switching can be achieved by choosing channel 38 and pressing the keys
store lock and control at the same time.

Picture O.K., little or no sound. 1: Appliance is in hotel mode.

Sound varies with picture content.
1: Sound varies under the influence of picture variations. Replace bridging wire 9511 (middle of print, directly behind
tuner) with a 6.2V zener diode BZX79/C6V2 (4822 130 34167), cathode to C2058. Replace C2030 (47µF, near the
up) with 22µF (5322 124 41431).
2: Replace D6031 and D6032 (both 12V zener). If not fitted, add as follows:- Connect anodes of the two diodes
together. Connect cathode of one diode to R3058 (100R). Connect cathode of the other to C2058 (47uF/100V).

No sound, picture OK. 1: Replace IC 7103 (TDA 7052/N1; 4822 209 60956).

No picture and no sound.
1: Power supply does not start up. D6613 is defective. 2: Replace all zener diodes in the PSU.
3: Check if 95V is present. If not then change TS7610, TS7614, TS7629, D6610 and D6613 and check R3616 and
R3680.
4: Replace IC7020 (TDA8305), IC7103 (TDA7052), IC7500 (TDA3653), D6523, TR7521, TR7523, D6058, D6030,
R3100 and tuner.
Note: If you disconnect the +95V on the collector of BUT12, drive signal is missing on the base. The pulse is visible
for a short time at the moment of switch on, on pin 26 of the IC7020. Drive occurs via R3058, C2068, D6030, D6058,
IC7020C, IC7020B, Pin 26 etc.
5: Replace coil 5524, D6523 and 0.125mA fuse (not fitted in all appliances). 6: C2044 (4µF) is s/c.
7: [95V HT supply ok, no line drive]. Check L5524 for open circuit.

During picture changes sometimes a volume increase (plop) is heard.
Restriction: 20" sets
Replace bridge-wire (/jumper) 9511 by diode 6031 BZX79-C12, (4822 130 34197), section/location F7, page 8, of
chassis GR1-AX 20" (4822 727 18093).
Add diode 6032 BZX79-C12, (4822 130 34197), section/location G7 of the chassis lay-out.
NOTE: Items 6031 and 6032 are not drawn in the circuit-diagram.

No sound.
1: Restriction: With production code starting with SV
Check IC7103 (TDA7052; 4822 209 60956).
If IC7103 needs to be replaced, it is recommended that you:
* Delete jumper 9063 and diode 6101 (between pin 4 and 7 of IC7103)
* Add jumper 9105 soldered to pin 4 and 7 of IC7103.
REMARKS: This information is valid for sets produced after wk9050 and before week 9122 except stroke numbers
02/22/35/36/37/38 and /11.
2: Check pin 19 of 7020; if no 6.6V, change 2031. 3: Check R3100 (2R2) for open circuit.

TON

Weak audio volume.
1: Zener diode 5.1V (D6715) is leaky. This diode, fitted in the volume control line, is mounted near the
microcontroller chip IC7700 (TMP47C434-3559).

Cannot be programmed and search does not function. Only limited volume adjustable.
1: Appliance is in "Hotel-Mode".
To switch on Hotel-Mode: select channel 38 and adjust max. desired volume. Press "Store" button and "Channel +"
button simultaneously. To switch off Hotel-Mode: Select channel 38, press "Store" button and "Control +" button
simultaneously.

Volume change with great fluctuations in brightness.
1: Fit zener diodes BZX79/C12 pos. 6031 and 6032.
Note: These diodes are not present in the circuit diagram but are marked in the location plan. They are positioned in
series with R3058. (On the print the diodes are replaced by wire bridges).

No sound or vision - blank screen. 1: C2044 (4uF) S/C.

Sound goes to max. intermittently and HT varies. 1: Replace C2631 at the base of standby switching
transistor.

Intermittent sound buzz. 1: 6MHz.filter (CF1036) is faulty.

Sound increases intermittently or "pops", especially during bright scenes.
1: Change C2030 from 47mF to 22mF.16V and fit a 6.2V zener diode in position 6031 or in place of link 9511.

No sound or raster. The 95V HT supply is present at the line output stage but there is no line drive.
1: Check L5524 coil for O/C.

Low sound.
1: Check D6715 (5.1V) zener diode for being leaky. It is in the volume control line, mounted adjacent to the
TMP47C434-3559 Chip IC7700.
2: Check the disc ceramic capacitors around the sound IF strip. Main suspect is C2033 (22nf).

Sound is slow to come back when the channel is changed and if search tuning is tried it continues when a channel is
found.
1: The"ident" signal to the microcontroller chip is permanently low because transistor TR7046 (BC558) is S/C.

Poor volume. 1: Zener diode D6715 (5.1V) leaky.

Volume can't be tuned down, no tuning withremote control.
1: Replace the ST24CO2CP chip IC7785. [cheaper alternative].
2: Replace the microcontroller chip IC7700 with part number TMP47C434N-3537.

No sound or picture. Sound motorboating when cold.
1: Replace 6614 due to S/C. 2: Faulty remote receiver, O/C 2616. 3: Replace IC7020 and C2045.

Intermittent sound and picture. 1: 2631 is leaky. 2: Replace 6618.
3: Break in PCB track from 6300 to pin 7 7300. 4: Replace 2502.

Picture and sound are missing, just slight motorboating noise. 1: Check C2048 (2700pF) at pin 23 of
IC7020.

Sound returns gradually after channel change. 1: Check T7046 (BC558).

No function, stand-by LED blinks. 1: 7521 has a B/E short.

No function.
1: Replace T7610, BUK444-500B and BUK445-600B, also BZX79-C15 and R3680.
2: L5524 (482215621293) is o/c.

FUNKCIJSKE

The appliance will not start up.
1: The thyristor 6641CSF2D41 in the overvoltage protection is defective. Position: overvoltage fuse.

Appliance does not function.
1: Microprocessor (4822 310 319 47) is defective.
2: Power supply is ineffective. Replace D6610-C10V. D6613-C15V. D6620-BYD33J. D6629-C2,6V. D6638-C36V.
D6639-C36V. D6640-C30V. D6641-SF2D41. R3616-1R. R3680-1R. TR7610-BUK444. TR614-BF487.

Set intermittently does not come on, especially from cold.
Restriction: for sets with serial nr. PM.. or ZB..
1: 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 transistor at switch on. If nothing there replace components around line driver stage especially T7523 (4822
130 41344), T7521 (4822 130 41344), D6523, (4822 130 30621), 6524 (4822 130 42488) and C2523 (4822 124

41578).
2: Check the starting voltage on pin 11 of IC7020 just after switching on. If this is fine, check line pulses on pin 11 of
IC7020 shortly after switching on. If these are present then replace electrolytic C2523 with a 50V type (4822 124

80379). Check/replace TS7523, TS7521, D6523 and D6524.

Set comes on in store lock mode.
1: It may happen that when switching on from standby the set comes on in "store lock" mode (som etim es called "hotel
mode"). In this mode stored settings for programme selection and personal preference cannot be changed (see
operating instructions). To overcome this, a production change has been introduced replacing the memory IC (7785)
with another type ST24C02CP supplied with shield under code no. 4822 310 31886. At the same time the +5V supply
is changed, L5786 being connected between pin 8 of IC7785 and R3797 instead of R3770/3767 using a vacant print
pad adjacent to R3793. The shield should be positioned over the IC and soldered in place of link 9020. The change
applies to receivers with factory codes starting from SV9001 or PM8928. The change can be applied as a service
solution in cases of specific complaint.

Switches to Hotel-Mode.
1: Replace IC 7785 by a new type (ST24C02CP; 4822 209 62098). Remark: The following modification has to be
applied: disconnect coil S 5786 on junction 5786/3767/3770 and mount jumper 9030.
See Service Information 4/90
Switch off of Hotel-Mode:

1. Select programm 38

2. Press simultaneously knobs Store and Control+

3. The Hotel-Mode is switched on.

No reception, screen blank. OSD OK.
1: Voltage pin 10 IC7020 too low. Check C2045 (22nF; 4822 122 30103).

Local controls inoperative.
1: Check/replace IC 7700 (TMP47C434N-3537 and metal screening (4822 310 31947). Important: mount the metal
screening.

Set will not come out of standby.
Check/replace the EPROM, IC7785 (ST24C02CP; 4822 209 62098).

Set goes into Stand-by. Check/replace C2631 (22nF; 4822 122 40606).

Set goes accidentally into hotel mode.
Restriction: non remote control sets.
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 track from the "P-" button to the "P+" button at the side of the "P-" button. Connect
this interruption again via a diode (1N4148; 4822 130 30621) with the cathode to the "P-" and the anode to the "P+"
button.
REMARKS: The symptom is not specific for none RC sets, however it is more
likely that it might happen when the local keyboard is operated frequently.

Set fails to start-up from standby mode, or at cold temperature.
Restriction: Prod.code with SV, except /59/61/65/66/67/68

1: Change C2058 from 33 uF to 47 uF 100V (4822 124 42085).
REMARKS: The cure is applicable for sets produced in week 9041-9047.

Shuts once in a while and goes to stand-by.
Check C2631 (22nF; 4822 122 30103) on leakage.

Reluctant to start from cold 1: Zenner diode 6638 (BZX79-B36) leaky.

No function at switch on from standby. Switches to LOCK (hotel) mode.
1: Replace IC7785 (X2402) by ST24CO2CP. Connect IC7785 to +5A instead of to +5B.
Part no: 4822 209 62098
2: Fit diode (1N4148) between P- key, cathode to R3736.

Set goes off after a couple off hours, with HT present.
1: Replace D6523 (1N4148), TR7251 and TR7523 both usually (BC337) and change C2523 from (6.8uf) to
(68uf)63V.

No switch on after activating mains switch. Whistling noise.
1: S/C on 95V line in power supply stage. Replace zener diodes D6645, D6646 and D6647.

Stops at start up.
1: Excessive power supply voltage, R3627 (68K) has altered in value.

Programme tuning difficulty, stations shifted on tuning bar.
1: There have been cases where tuning in programmes has been difficult. Symptoms are: stations appearing to right of
usual position on 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 are both correct,
tuning voltage at pin 11 of the tuner is low. In a number of cases the fault was caused by a defective T7705 PH2369
(code no. 4822 130 41594).
NB: T7705 need only be replaced in cases of specific complaint.

Programming not possible.
1: Hotel-Mode is switched on. Switch off Hotel-Mode as follows:

1. Select programm 38

2. Press Store and Control + knobs simultaneously

3. The Hotel-Mode is switched off.

Tuning unstable.
1: Voltage on D 6702 is not stable. Replace D 6702 (ZTK33B; 4822 130 30959).

Contents of memory lost.
1: Replace IC 7785 (ST24C02CP; 4822 209 62098). Important: The following modification has to be applied:
disconnect coil S 5786 on junction 3767/3770 and mount jumper 9030. See also Service Information 4/90.
2: When switching on from standby the set may come 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 leaving this mode).
Switch off of Hotel-Mode:

1. Select programm 38

2. Press simultaneously knobs Store and Control+

3. The Hotel-Mode is switched off
The change applies to receivers with factory codes starting from SV9001 or PM8928.
The change can be applied as a service solution in cases of specific complaint.

After operating for one hour it is no longer possible to switch over programmes not even from the front panel.
Appliance must be switched on and off then it is possible to change channels.
1: Replace processor IC and memory IC.

Programs and PP-settings cannot be changed.

MEMORIJA

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 leaving this mode).
Switch off of Hotel-Mode:

1. Select programm 38

2. Press simultanuously knobs Store and Control+

3. The Hotel-Mode is switched off
The change applies to receivers with factory codes starting from SV9001 or PM8928.
The change can be applied as a service solution in cases of specific complaint.

Search jumps on UHF.
Check/replace R3788 (2M2; 4822 116 81682).

After replacing uP and memory, setting does not stay.
The appliance is in hotel mode. Go to program channel 38 and press
buttons store and control+.

Sweep-tune will not lock on signal.
1: AFC coil (L5045) u/s.

TV will not tune to high channels.
1: Tr7705. Causes wrong tuning voltages at pin 11 of tuner.

Channel search does not stop on all channels. When a channel is found, channel search has set off again.
1: Adjust coil S5045 to IF.

Will not tune on some channels.
1: Will not tune, drifts, colour disappears or interference on a certain channel. (e.g. channel 5 and 59).
The cause is a poor earth connection of the screening plate of the channel selecter. Solder down the screening plate.

Channels cannot be programmed, intermittent green picture.
1: Coil (10uH) S5786 is fitted incorrectly on print (on 5A instead of 5B voltage). Fit coil S5786 as drawn on print
layout. Check IC7785 (X2402) for defects.
Part no: 4822 209 73313 X2402

No channel search programme.
1: uP OK. Appliance is in hotel mode (see circuit description). Set appliance to programme 38. Press store key and
control+ key simultaneously.

Tuning drift.
1: May be caused by the tuner unit. Check by heating it. 2: Check D6702 (ZTK33B)

Failure to retune or change the volume, colour etc. and store new values.
1: The store-lock facility has probably been set accidentally. To unlock it select channel 38 then press the store and
control buttons simultaneously.

No tuning, no remote volume control. 1: May be caused by a faulty microcontroller chip, IC7700.

Cannot change tuning or stored settings.
1: Set is coming on in Hotel Mode. Replace memory IC7785 with type ST24C02CP. Also the 5V rail is changed,
L5786 is connected between pin 8 of IC7785 and R3797 instead of R3770/R3767 using the vacant blank print pad
adjacent to R3793.

No tuning. 1: Replace microprocessor.

Tuning drift, when it is hot the tuning is lost on channel change. 1: Check the U743 tuner.

Skips channels in channel search.
1: [Replaced coil, TDA and tuner]. Check earthing connections on shielding plate of channel selector.

Set won't tune to high frequency channels and lower frequency channels appear to be higher.
1: Tuning band TR7705 (part no. 4822 130 41594) could be defective causing incorrect tuning voltages at pin 11 of
the tuner.

Tuning does not function. 1: Replace µprocessor and EEPROM with updated versions with heat shields.

Difficultly in tuning. 1: Check T7705 (PH2369).

No tuning bar when install button pressed and set not in hotel mode.
1: Check C2052 150pF S/C CVBS input pin 25 of IC7020.

No tuning voltage. 1: Check R3703.

Does not stop searching. 1: Replace C2031.

Not stopping at channel during tuning. 1: Check L5045 for O/C.

Picture shifted to right side.
1: Check print around edge of board around line output transformer from R3529 (470K) to a chassis link, for damage.

Height excessive. 1: Check C2043 (82pF).

Poor reproduction of copy protected tapes.
1: 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 Old New Code No
:C2322 220nF 1µF 4922 124 40242 :R3051 1K8 1K5 4822 116 55243
:R3050 82K 75K 4822 116 52301 :C2050 68nF 47nF 4822 121 42491

Defective C2523.
1: If C2523 (6.8µF/50V) is defective, then the line transistor T7528 may also become defective. Replace C2523 with
a 68µF/63V capacitor code number 4822 124 40754.

Defective IC7103 SV-production.
Note: For appliances with a defective IC7103 (output stage sound) with production code SV and production week
between 9050 and 9122 take the following measures:

-Remove jumper 9063 and diode 6101 (BZX79/C2V4), add jumper 9105 between pin 4 and 7 of IC7103 on the copper
side of the print. The above is not applicable to models /02, /11, /22, /35, /33, /36 and /37.

OSD-display is black and white. Check/replace D6761 (1N4148; 4822 130 30621).

Faulty functions with remote control RC 5701.
Battery spring does not contact Philips alkale battery. Change remote control.
REMARKS: The spring has been changed in production from week 9212 onwards.

Whistling noise (from LOT).
1: Restriction: For prod. code SV.. and sets with Hitachi LOT.

1) Glue the plastic lugs of the LOT L5530 with silicon or equivalent (non-reactive) at the copper track side of the
PWB to damp off vibrations which causes the whistling.

2) Fit a non Hitachi LOT L5530; 4822 140 10369.
REMARKS: The cause of the noise comes from the air gap inside the LOT. Modification introduced in production in
week 9326.

Menu rolling.
1: Dry joints. S7020 and power supply. 2: 7020 O/C track pin 26.

Display goes to F1 a few seconds after switching the set on. 1: Transistor 7739 (BC548) S/C.

GEOMETRIJA

OSTALO