In the interests of user safety (required by safety
regulations in some countries) the set should restored
to its original condition and only parts identical to
those specified should be used.
CONTENTS
ELECTRICAL SPECIFICATION.......................2
IMPORTANT SERVICE NOTES.......................3
SERVICE ADJUSTEMENTS.............................4
•White Level
Set brightness control to get total picture tube cathode current of 600 milliamperes under no signal condition.
Maximum necessary correction of each picture tube cathode current to get 8950 degree K-20 MPCD screen
temperature should not exceed 15% of its original value.
Specifictions are subject to change without prior notice.
W ARNING
The chassis in this receiver is partially live. Alwais use an isolation transformer when
servicing this chassis.
To prevent electric shock, do not remove cover. No user-serviceable parts inside. Refer
servicing to qualified service personnel.
2
37GQ-20FP
IMPORT ANT SERVICE NOTES
Maintenance and repair of this receiver should be done by qualified service personnel only .
SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE
When servicing the high voltage system, remove static charge from it by connecting a 10K ohm resistor in
series with an insulated wire (such as test probe) between picture tube ground tag and high voltage lead.
(AC line cord should be disconnected from AC outlet).
1. The Picture tube in this receiver employs Integral Implosion protection.
2. Replace with tube of the same type number for continued safety .
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing shatterproof goggles and after discharging the high
voltage completely .
X-RAY
This receiver is designed so that any X-Ray radiation is kept to an absolute minimum. Since certain malfunctions
and servicing may produce potentially hazardous radiation with prolonged exposure at close range, the following
precautions should be observed:
1. When repairing the circuit, be sure not to increase the high voltage to more than 25.5 KV , (at beam
1000µΑ) for the set.
2. T o keep the set in a normal operation, be sure to make it function on 22.4KV
800µΑ) in the case of the set. The set has been factory - adjusted to the above mentioned high
voltage. Always check the high voltage if there is any possibility that it might have changed as a
result of the repair.
3. Do not substitute a picture tube with unauthorized types and/or brands which may cause excess
X-Ray radiation.
±1.5KV (at beam
BEFORE RETURNING THE RECEIVER
In addition to the above checks, the following safety checks should also be carried out before returning the
unit to the user.
1. Inspect all leads and dress to make certain that the leads are not pinched or that hardware is not
logged between the chassis and other metal parts.
2. Inspect all protective devices such as non-metallic control knobs, insulating fish papers, cabinet
backs, adjustment and compartment covers or shields, insolation resistor-capacity networks,
mechanical insulators etc.
3
37GQ-20FP
SERVICE ADJUSTMENT
•SERVICE MODE FUNCTION
This mode funtion is provided to assist with the settings of those adjustments that may vary from one
Picture Tube to another, or between models.
In order to use the Service Mode
1. Press main switch to OFF.
2. Connect Test Pattern signal to antenna terminal.
3. Press ∨ , CH ∨ and main switch to ON simultaneosly or
press ∧ , CH ∧ and main switch to ON simultaneosly.
4. -SERVICE- will appear on screen. Service mode is now entered.
5. Select adjustment using buttons ∧ CH ∧.
To exit Service Mode, press main switch to OFF or press MENU button on R/C.
Indicates operative Service Mode.
Access to NVM memory
Auto Gain Control
Auto Gain Starting Point
Line PLL time constant
Colour system.
Field Frequency
Blue Gain
Green Gain
Green Cut
Red Gain
Red Cut
Horizontal Position shift
V ertical Position shift
V ertical Amplitude shift
6. For « a » Selection:
NVM storage location settings variants.
BANK POSVALUE
XXXH XXH Assigned value
Storage location
Memory Bank
In order to have access to NVM «MENU» button should be pressed. To obtain a higher or lower Memory
Bank, buttons ∨ ∧ should be pressed respectively. To have access to the desired Storage Location,
buttons ∨ CH ∧ should be pressed, as required to obtain a higher or lower location, respectively.
4
37GQ-20FP
NVM LIST DESCRIPTION
BANKADDRESSDESCRIPTIONVALUE
00H00HZONE FOR TUNNING INFORMATION (BEGIN)CAH
3BHZONE FOR TUNNING INFORMATION (END)10H
3CHSTAND BY: 44H -> ON
40H -> OFF
44H
3DHOPTION BYTE:
10XXXXXX -> HOTEL MODE 1 (START IN
PRG1. NO TUNNING OPTION.
VOLUME LIMITATION).
11XXXXXX -> HOTEL MODE 2 (START IN
PRG 1. NO TUNING OPTION.
VOLUME LIMITATION.
START IN SCART MODE.
OUT FROM STDBY WITH SSW.
XXDDDDDD -> VOLUME ATTENUATION:
0AH -> 100%, 00H -> 0%
0AH
3EHDIODE_NVM:
XXXXXXX0 -> SYMBOLIC OSD.
XXXXXXX1 -> CHARACTER OSD
XXXXX1XX -> ENGLISH LANGUAGE.
04H
3FHDIODE2_NVM:
XXXXXXX1 -> FRENCH STANDARD
XXXXX01X -> BG STANDARD
XXXXX10X -> L/L’ STANDARD
XX1XXXXX -> AUDIO FOR UK
X1XXXXXX -> AUTOINSTALLATION ON
1XXXXXXX -> ONLY UHF BAND.
05H
01H00HZONE FOR TUNNING INFORMATION (BEGIN)10H
3BHZONE FOR TUNNING INFORMATION (END)10H
3DHUHFLOW: LOW WINDOW LIMIT FOR UHF BAND00H
3EHVHF3LOW: LOW WINDOW LIMIT FOR VHF3 BAND00H
3FHVHF1LOW: LOW WINDOW LIMIT FOR VHF1 BAND00H
02H00HRESERVED ZONE FOR PROGRAMME NAMES (BEGIN)24H
3FHRESERVED ZONE FOR PROGRAMME NAMES (END)24H
Bear in mind that, for storage location indication a hexadecimal numerical system is used, instead of a
decimal system.
FB, FC, FD, FE, FF.
From the last location FF to the first 00 can be reached by increasing and from first to last by decreasing.
Once the storage location to be varied has been selected, its value can be modified by the bits that form
part of the storage location numerical buttons, numbers «0» to «7», respectively. This swithches the binary
number from and between 0 and 1 each time one of the buttons is pressed.
«0»:20=1, «1»: 21=2, «2»: 22=4, ...
7. For «b,c» and «g» thru «n» selections:
Adjustment to a selection can be made by pressing buttons ∨ ∧.
8. For «d» thru «f» selections:
Adjustment to a selection can be made by pressing button ∧.
XXXXXXX0 -> SHOWS ‘PROGRAMME –‘
DURING AUTOSEARCH.
XXXXXXX1 -> DHOWS ‘AUTO SEARCH’
DURING AUTOSEARCH
00H
2FHVHF1_SP: STEP FOR AUTO SEARCH IN VHF1 BAND17H
30HVHF3_SP: STEP FOR AUTO SEARCH IN VHF3 BAND0AH
31HUHF_SP: STEP FOR AUTO SEARCH IN UHF BAND06H
32HOLD_PROGRAM: FOR FLASHBACK RETURN0AH
33HUHFHIGH: UPPER WINDOW LIMIT FOR UHF01H
34HVHF3HIGH: UPPER WINDOW LIMIT FOR VHF301H
6
37GQ-20FP
35HVH F1HIGH: UPPER WINDOW LIMIT FOR V HF101H
36HPRG _NUMB ER: CURREN T PROGRA MME NUMBE R08H
37HW AITSUP: UPPER L IMIT DELAY TIME FOR A UTOSEAR CH.0FH
38HW AITINF: LOWER LIMIT DELA Y TIME FOR A UTOSEA RCH03H
3BHSCART BL OKING:
- 00H = NO SCART BLOCKING
- 01H = SCART BLO CKING W HEN AN Y PR. IS IN CHILD
LOCK MOD E.
00H
Just for
3CHRET_COL: DE LAY IN COL OUR IDENT IFICATION IN AU TO
M O DE .
40H
3FHCHECK SUM35H
04H00HONE CH IP REGISTER 00:80H
01HON E CHIP REGISTE R 01:30H
02HON E CHIP REGISTE R 02:9FH
03HON E CHIP REGISTE R 03:2DH
04HON E CHIP REGISTE R 04:00H
05HON E CHIP REGISTE R 05:B6H
06HON E CHIP REGISTE R 06:00H
07HON E CHIP REGISTE R 07:32H
08HON E CHIP REGISTE R 08:19H
09HON E CHIP REGISTE R 09:99H
0AHONE CHIP REGISTE R 0A:3CH
0BHONE CH IP REGISTER 0B:B2H
0CHONE CH IP REGISTER 0C:2EH
0DHONE CHIP REGISTE R 0D:24H
0EHON E CHIP REGISTE R 0E:22H
0FHONE CH IP REGISTER 0F:18H
10HON E CHIP REGISTE R 10:1FH
11HON E CHIP REGISTE R 11:00H
12HON E CHIP REGISTE R 12:00H
13HON E CHIP REGISTE R 13:38H
14HON E CHIP REGISTE R 14:20H
15HON E CHIP REGISTE R 15:00H
16HON E CHIP REGISTE R 16:1DH
17HON E CHIP REGISTE R 17:0FH
18HON E CHIP REGISTE R 18:2FH
19HON E CHIP REGISTE R 19:00H
1AHONE CHIP REGISTE R 1A:90H
1BHONE CH IP REGISTER 1B:90H
1CHONE CH IP REGISTER 1C:90H
1DHONE CHIP REGISTE R 1D:00H
1EHON E CHIP REGISTE R 1E:00H
1FHONE CH IP REGISTER 1F:00H
20HVPO S_50 (VERTICAL PO SITION) 4/3 50 Hz.12H
21HVA MP_50 (VERTICA L AMPLITU DE) 4/3 50 Hz0FH
22HVPO S_60 (VERTICAL PO SITION) 4/3 60 Hz0FH
23HVA MP_60 (VERTICA L AMPLITU DE) 4/3 60 Hz0FH
24HHSH IFT_60 (HORIZONT AL SHIFT) 60Hz1DH
25HHSH IFT_50 (HORIZONT AL SHIFT) 50Hz22H
26HFINV FH: STEP FOR FINE T UNING IN VH F BAND00H
27HVH F1_STEP: THICK TUN ING STEP FO R VHF1 BA NDF3H
28HVH F3_STEP: THICK TUN ING STEP FO R VHF3 BA ND64H
29HUH F_STEP: THICK TU NING STEP FO R UHF BA ND64H
2AHLP_COARSE: THICK T UNING A DJUSTMEN T FOR L’02H
2BHBG_COA RSE: THICK TU NING ADJU STMENT F OR L AND BG0AH
2CHBG_FINE: FINE TUNING ADJUSTMENT FOR L AND BG00H
2DHLP_FINE: FINE TUNING AD JUSTMEN T FOR L’00H
2EHDE LAY SEAR CH:
XXXXX X X0 - > S H OW S ‘PROGRA MME – ‘
DURI N G AU T OS E A RC H .
XXXXX X X1 - > D HO WS ‘AUT O S E AR C H’
DURING AU T OS E AR C H
00H
7
Do not use.
UK models
37GQ-20FP
2FHVHF1_SP: STEP FOR AUTO SEARCH IN VHF1 BAND17H
30HVHF3_SP: STEP FOR A UTO SEARCH IN VHF3 BAN D0AH
31HUHF_SP: STEP FOR A UTO SEARCH IN VHF BAND06H
32HOLD_PROGR AM: FOR FLASHBAC K RETURN0AH
33HUHFHIGH: UPPER WINDOW LIMIT FOR UHF01H
34HVHF3HIGH: UPPER WINDOW LIMIT FOR VH F301H
35HVHF1HIGH: UPPER WINDOW LIMIT FOR VH F101H
36HPRG_NUM BER: CURRENT PR OGRAM ME NUMBER08H
37HWAITSUP: UPPER LIMIT DELAY TI ME FOR AUTOSEARCH.0FH
38HWAITINF: LO WER LIM IT DELAY TIM E FOR AU TOSEAR CH03H
3BHSCART BLOKIN G:
- 00H = NO SCARTBLOCKING
- 01H = SCART BLOCKING WHEN ANY PR. IS IN CHILD
LOCK M ODE.
00H
Just for
3CHRET_COL: D ELAY IN CO LOUR IDEN TIFICATIO N I N AUTO
MODE.
40H
3FHCHECK SUM35H
05H00HONE CHIP REGISTER 00:80H
01HONE CHIP REGISTER 01:30H
02HONE CHIP REGISTER 02:9FH
03HONE CHIP REGISTER 03:2DH
04HONE CHIP REGISTER 04:00H
05HONE CHIP REGISTER 05:B6H
06HONE CHIP REGISTER 06:00H
07HONE CHIP REGISTER 07:32H
08HONE CHIP REGISTER 08:19H
09HONE CHIP REGISTER 09:99H
0AHONE CHIP REGISTER 0A:3CH
0BHONE CH IP REGISTER 0B:B2H
0CHONE CHIP REGISTER 0C:2EH
0DHONE CHIP REGISTER 0D:24H
0EHONE CHIP REGISTER 0E:22H
0FHONE CH IP REGISTER 0F:18H
10HONE CHIP REGISTER 10:1FH
11HONE CHIP REGISTER 11:00H
12HONE CHIP REGISTER 12:00H
13HONE CHIP REGISTER 13:38H
14HONE CHIP REGISTER 14:20H
15HONE CHIP REGISTER 15:00H
16HONE CHIP REGISTER 16:1DH
17HONE CHIP REGISTER 17:0FH
18HONE CHIP REGISTER 18:2FH
19HONE CHIP REGISTER 19:00H
1AHONE CHIP REGISTER 1A:90H
1BHONE CH IP REGISTER 1B:90H
1CHONE CH IP REGISTER 1C:90H
1DHONE CHIP REGISTER 1D:00H
1EHONE CHIP REGISTER 1E:00H
1FHONE CH IP REGISTER 1F:00H
20HVPOS_50 (VERTICAL POSITION) 4/3 50 Hz.12H
21HVAMP_50 (VERTICAL AMPLITUDE) 4/3 50 Hz0FH
22HVPOS_60 (VERTICAL POSITION) 4/3 60 Hz0FH
23HVAMP_60 (VERTICAL AMPLITUDE) 4/3 60 Hz0FH
24HHSHIFT_60 (HORIZONTAL SHIFT) 60Hz1DH
25HHSHIFT_50 (HORIZONTAL SHIFT) 50Hz22H
26HFINVFH: STEP FOR FINE TUNING IN VHF BAN D00H
27HVHF1_STEP: TH IC K TUNING STEP FOR V HF1 BAN DF3H
28HVHF3_STEP: TH IC K TUNING STEP FOR V HF3 BAND64H
29HUHF_STEP: THIC K TUNING STEP FOR U HF BAND64H
2AHLP_COARSE: THICK TUNING ADJUSTMENT FOR L’02H
Do not use.
UK models
8
2BHBG_COARSE: THICK TUNING AD JUSTMENT FOR L AND BG 05H
2CHBG_FINE : FINE TUNING ADJU S TMENT FOR L AND BG80H
2DHLP_FINE: FINE TUN ING ADJUSTMENT FOR L’80H
2EHDELAY SEARCH:
DURI NG AUTOSEARCH
2FHVHF1_SP: STEP FOR AUTO SEARCH IN VHF1 BAND17H
30HVHF3_SP: STEP FOR AUTO SEARCH IN VHF3 BAND0AH
31HUHF_SP: STEP FOR A UTO SEARCH IN VHF BAN D06H
32HOLD_PROGR AM: FOR FLASHBACK RETURN0 AH
33HUHFHIGH: UPPE R WINDOW LIMIT FOR UHF01 H
34HVHF3HIGH: UP PE R WINDOW LIMIT FOR VHF301H
35HVHF1HIGH: UP PE R WINDOW LIMIT FOR VHF101H
36HPRG_NUM BER: CURRENT PRO GRAM ME NU MBER08H
37HWAITSUP: UPPER L IMI T DELAY TI ME FOR AUTOSEARCH.0FH
38HWAITINF: LO WER LIMIT DELAY TIME FOR AUTOSE ARCH03H
3BhSCART BLOKING:
- 00H = NO SCARTBLOCKING
- 01H = SCART BLOCKING WHEN ANY PR. IS IN CHILD
LOCK M ODE.
3CHRET_COL: D ELAY IN CO LOUR IDEN TIFICATIO N I N AUTO
MODE.
3FHCHECK SUM35H
00H
00H
Do not use.
Just for
UK models
40H
37GQ-20FP
••
•PIF/AGC Adjustement
••
1. B/G AFT Adjustment
Connect the output of SSG (Standard Signal
1.
Generator) to the tuner IF output terminal.
•SSG output 38.9 MHz (CW) ± 5 KHz.
•SSG output level: approx. 90 dBµV.
Enter into Service Mode.
2
.
Push «2» key on R/C. «FI OK» will appear.
3.
Switch set OFF and ON again, setting is now
4.
memorized.
2. L/L’ AFT Adjustment
Connect the output of SSG (Standard Signal
1.
Generator) to the turner IF output terminal.
•SSG output 34.47MHz (CW) ± 5 KHz.
•SSG output level: approx. 90 dBµV.
Enter into Service Mode.
2.
Push «3» key on R/C. «FI OK» will appear.
3.
Switch set OFF and ON again, setting is now
4.
memorized.
3. RF-AGC STR Adjustment
Receive the «COLOUR BAR» signal (Channel E-
1.
12). Signal strength: 57 dBµV.
Enter into Service Mode.
2.
Push CH until AGC STR appears on screen.
3.
Push «7» key of R/C.«AGC OK» will appear.
4.
Switch set OFF and ON again, setting is now
5.
memorized.
••
•Screen Adjustement
••
4. Focus Adjustment
Apply mains voltage of 220V AC/50HZ to TV.1.
Receive Philips pattern signal to a level
2.
between 60 and 80
Set contrast to 10/10, brightness to 5/10
3
.
dBµV.
and colour 0/10.
Adjust focus potentiometer to obtain
4
.
maximum definition.
5. G2 Adjustment
Apply mains voltage of 220V AC/50HZ to TV.
1.
Receive cross hatch pattern signal to a level
2.
between 60 and 80 dBµV.
Apply High Voltage Probe to Pin 8 of CRT socket
3.
Adjust G2 potentiometer until obtaining 525V
4.
±10%.
Check BKGD. If it is necessary adjust BKGD
5.
according to instructions detailed in the next
page.
9
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