Sharp 37GQ-20FP User manual

1
37GQ-20FP
SHARP CORPORATION
CONTENTS
PAL / SECAM SYSTEM COLOUR TELEVISION
SEJ37GQ20FP02
SQUAD CHASSIS
SERVICE MANUAL
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.
MODEL 37GQ-20FP
Issued: 9th June ‘00
This document has been published to
be used for after sales service only.
ELECTRICAL SPECIFICATION.......................2
IMPORTANT SERVICE NOTES.......................3
SERVICE ADJUSTEMENTS.............................4
PRINTED WIRING BOARDS...........................11
SCHEMATIC DIAGRAM, WAVE FORMS..... .13
PART LIST.......................................................18
TROUBLESHOOTING TABLES.....................22

2
37GQ-20FP
ELECTRICAL SPECIFICATIONS
•Power Input .......................220V-240 Volts AC 50Hz
•Power Consumption
•Audio Power Output Rating .....................2W (MPO)
Speaker............................32Ω2W, 8cm Round, 1pc
Normal Operating....................................30W
Stand-by Operating................................7.5W
(Method IEC60107)
•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.
X=0.290 Y=0.284
WARNING
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.
Convergence.........................Self Converging System
Focus....................................Bi-Potencial Electrostatic
Sweep Deflection...........................................Magnetic
Specifictions are subject to change without prior notice.
•Sound Carrier Trap
L’..........................................................40.4MHz
L...........................................................32.4MHz
B/G.......................................................33.4MHz
•Picture Intermediate Frecuencies
L’.........................................................33.9MHz
L, B/G..................................................38.9MHz
•Adjacent Sound Carrier Trap
L’..........................................................32.4MHz
L, B/G...................................................40.4MHz
•Adjacent Picture Carrier Trap
L’..........................................................41.9MHz
L...........................................................30.9MHz
B/G.......................................................30.9MHz
•Aerial Input Impedance
VHF/UHF...........................75 ohm Unbalanced
•Tuning Ranges
CATV Special Channels
L/L’..........................55.75MHz thru 855.25 MHz
B/G.........................48.25MHz thru 855.25 MHz

3
37GQ-20FP
SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE
Maintenanceandrepairofthisreceivershouldbedonebyqualifiedservicepersonnelonly.
Whenservicingthehighvoltagesystem,removestaticchargefromitbyconnectinga10Kohmresistorin
serieswithaninsulated wire (suchastest probe) betweenpicturetube ground tag andhigh voltage lead.
(AClinecordshould be disconnectedfromAC outlet).
1.The Picture tube in thisreceiveremploysIntegralImplosionprotection.
2.Replacewithtube of the same typenumber for continued safety.
3.Do not liftpicture tubeby the neck.
4.Handle the picturetubeonlywhenwearingshatterproofgogglesand after discharging thehigh
voltagecompletely.
X-RAY
ThisreceiverisdesignedsothatanyX-Rayradiationiskepttoanabsoluteminimum.Sincecertainmalfunctions
andservicingmayproducepotentiallyhazardousradiationwithprolongedexposureatcloserange,thefollowing
precautionsshouldbeobserved:
1.When repairing the circuit,be sure notto increasethe highvoltage tomore than 25.5KV, (at beam
1000µΑ)for the set.
2. To keep theset ina normaloperation, besure tomake itfunction on22.4KV±1.5KV (at beam
800µΑ) in thecase of theset. The sethas been factory-adjusted tothe abovementioned high
voltage.Alwayscheckthehighvoltageifthereis any possibility that it might have changed as a
resultof therepair.
3.Donotsubstitute a picture tubewithunauthorized types and/or brandswhich may cause excess
X-Ray radiation.
BEFORE RETURNING THE RECEIVER
Inadditiontotheabovechecks,thefollowingsafetychecksshouldalsobecarriedoutbefore returningthe
unittotheuser.
1.Inspect all leadsanddress to makecertainthat theleads arenot pinchedor thathardwareis not
loggedbetween thechassis andother metalparts.
2.Inspectallprotectivedevices such as non-metallic control knobs, insulating fish papers, cabinet
backs, adjustment andcompartment covers or shields,insolation resistor-capacity networks,
mechanicalinsulatorsetc.
IMPORTANT SERVICE NOTES

4
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.
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
SERVICE
NVM
AGC GAIN
AGC STR
PLL
PAL
AUTO
B-GAIN
G-GAIN
G-DC
R-GAIN
R-DC
HOR POS
VERT POS
VERT AM
Displayed
on screen Hexadecimal /
Decim. Range Function
00∼03H
00∼63H
S, L, VL, N
4-43, 3-58,
SECAM, NTSC
4-43,NTSC 3-58,
AUTO PNS,
AUTO PN
AUTO, 50HZ,
60HZ
0∼63d
0∼63d
0∼63d
0∼63d
0∼63d
0∼63d
0∼63d
0∼15d
Indicates operative Service Mode.
Access to NVM memory
Auto Gain Control
Auto Gain Starting Point
Line PLL time constant
Colour system.
FieldFrequency
Blue Gain
Green Gain
Green Cut
Red Gain
Red Cut
Horizontal Position shift
Vertical Position shift
Vertical Amplitude shift
6. For « a » Selection:
NVM storage location settings variants.
BANK POS VALUE
X XXH 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.

5
37GQ-20FP
Bear in mind that, for storage location indication a hexadecimal numerical system is used, instead of a
decimal system.
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10, 11, ......19, 1A, 1B, 1C, 1D, 1E, 1F, 20, 21, ....., 99, 9A, 9B,
9C, 9D, 9E, 9F, A0, A1, ....., B0, ....., C0, ....., D0, .....E0, ....., F0, F1, F2, F3, F4, F5, F6, F7, F8, F9, FA,
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 ∧.
NVM LIST DESCRIPTION
BANK ADDRESS DESCRIPTION VALUE
00H 00H ZONE FOR TUNNING INFORMATION (BEGIN) CAH
3BH ZONE FOR TUNNING INFORMATION (END) 10H
3CH STAND BY: 44H -> ON
40H -> OFF 44H
3DH OPTION 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
3EH DIODE_NVM:
XXXXXXX0 -> SYMBOLIC OSD.
XXXXXXX1 -> CHARACTER OSD
XXXXX1XX -> ENGLISH LANGUAGE.
04H
3FH DIODE2_NVM:
XXXXXXX1 -> FRENCH STANDARD
XXXXX01X -> BG STANDARD
XXXXX10X -> L/L’ STANDARD
XX1XXXXX -> AUDIO FOR UK
X1XXXXXX -> AUTOINSTALLATION ON
1XXXXXXX -> ONLY UHF BAND.
05H
01H 00H ZONE FOR TUNNING INFORMATION (BEGIN) 10H
3BH ZONE FOR TUNNING INFORMATION (END) 10H
3DH UHFLOW: LOW WINDOW LIMIT FOR UHF BAND 00H
3EH VHF3LOW: LOW WINDOW LIMIT FOR VHF3 BAND 00H
3FH VHF1LOW: LOW WINDOW LIMIT FOR VHF1 BAND 00H
02H 00H RESERVED ZONE FOR PROGRAMME NAMES (BEGIN) 24H
3FH RESERVED ZONE FOR PROGRAMME NAMES (END) 24H

6
37GQ-20FP
03H 00H ONE CHIP REGISTER 00: 80H
01H ONE CHIP REGISTER 01: 30H
02H ONE CHIP REGISTER 02: 9FH
03H ONE CHIP REGISTER 03: 2DH
04H ONE CHIP REGISTER 04: 00H
05H ONE CHIP REGISTER 05: B6H
06H ONE CHIP REGISTER 06: 00H
07H ONE CHIP REGISTER 07: 32H
08H ONE CHIP REGISTER 08: 19H
09H ONE CHIP REGISTER 09: 99H
0AH ONE CHIP REGISTER 0A: 3CH
0BH ONE CHIP REGISTER 0B: B2H
0CH ONE CHIP REGISTER 0C: 2EH
0DH ONE CHIP REGISTER 0D: 24H
0EH ONE CHIP REGISTER 0E: 22H
0FH ONE CHIP REGISTER 0F: 18H
10H ONE CHIP REGISTER 10: 1FH
11H ONE CHIP REGISTER 11: 00H
12H ONE CHIP REGISTER 12: 00H
13H ONE CHIP REGISTER 13: 38H
14H ONE CHIP REGISTER 14: 20H
15H ONE CHIP REGISTER 15: 00H
16H ONE CHIP REGISTER 16: 1DH
17H ONE CHIP REGISTER 17: 0FH
18H ONE CHIP REGISTER 18: 2FH
19H ONE CHIP REGISTER 19: 00H
1AH ONE CHIP REGISTER 1A: 90H
1BH ONE CHIP REGISTER 1B: 90H
1CH ONE CHIP REGISTER 1C: 90H
1DH ONE CHIP REGISTER 1D: 00H
1EH ONE CHIP REGISTER 1E: 00H
1FH ONE CHIP REGISTER 1F: 00H
20H VPOS_50 (VERTICAL POSITION) 4/3 50 Hz. 12H
21H VAMP_50 (VERTICAL AMPLITUDE) 4/3 50 Hz 0FH
22H VPOS_60 (VERTICAL POSITION) 4/3 60 Hz 0FH
23H VAMP_60 (VERTICAL AMPLITUDE) 4/3 60 Hz 0FH
24H HSHIFT_60 (HORIZONTAL SHIFT) 60Hz 1DH
25H HSHIFT_50 (HORIZONTAL SHIFT) 50Hz 22H
26H FINVFH: STEP FOR FINE TUNING IN VHF BAND 00H
27H VHF1_STEP: THICK TUNING STEP FOR VHF1 BAND F3H
28H VHF3_STEP: THICK TUNING STEP FOR VHF3 BAND 64H
29H UHF_STEP: THICK TUNING STEP FOR UHF BAND 64H
2AH LP_COARSE: THICK TUNING ADJUSTMENT FOR L’ 02H
2BH BG_COARSE: THICK TUNING ADJUSTMENT FOR L AND BG 0AH
2CH BG_FINE: FINE TUNING ADJUSTMENT FOR L AND BG 00H
2DH LP_FINE: FINE TUNING ADJUSTMENT FOR L’ 00H
2EH DELAY SEARCH:
XXXXXXX0 -> SHOWS ‘PROGRAMME –‘
DURING AUTOSEARCH.
XXXXXXX1 -> DHOWS ‘AUTO SEARCH’
DURING AUTOSEARCH
00H
2FH VHF1_SP: STEP FOR AUTO SEARCH IN VHF1 BAND 17H
30H VHF3_SP: STEP FOR AUTO SEARCH IN VHF3 BAND 0AH
31H UHF_SP: STEP FOR AUTO SEARCH IN UHF BAND 06H
32H OLD_PROGRAM: FOR FLASHBACK RETURN 0AH
33H UHFHIGH: UPPER WINDOW LIMIT FOR UHF 01H
34H VHF3HIGH: UPPER WINDOW LIMIT FOR VHF3 01H

7
37GQ-20FP
35H VHF1HIGH: UPPER WINDOW LIMIT FOR VHF1 01H
36H PRG_NUMBER: CURRENT PROGRAMME NUMBER 08H
37H WAITSUP: UPPER LIMIT DELAY TIME FOR AUTOSEARCH. 0FH
38H WAITINF: LOWER LIMIT DELAY TIME FOR AUTOSEARCH 03H
3BH SCART BLOKING:
-00H = NO SCARTBLOCKING
-01H = SCART BLOCKING WHEN ANY PR. IS IN CHILD
LOCK MODE.
00H
Do not use.
Just for
UK models
3CH RET_COL: DELAY IN COLOUR IDENTIFICATION IN AUTO
MODE. 40H
3FH CHECKSUM 35H
04H 00H ONE CHIP REGISTER 00: 80H
01H ONE CHIP REGISTER 01: 30H
02H ONE CHIP REGISTER 02: 9FH
03H ONE CHIP REGISTER 03: 2DH
04H ONE CHIP REGISTER 04: 00H
05H ONE CHIP REGISTER 05: B6H
06H ONE CHIP REGISTER 06: 00H
07H ONE CHIP REGISTER 07: 32H
08H ONE CHIP REGISTER 08: 19H
09H ONE CHIP REGISTER 09: 99H
0AH ONE CHIP REGISTER 0A: 3CH
0BH ONE CHIP REGISTER 0B: B2H
0CH ONE CHIP REGISTER 0C: 2EH
0DH ONE CHIP REGISTER 0D: 24H
0EH ONE CHIP REGISTER 0E: 22H
0FH ONE CHIP REGISTER 0F: 18H
10H ONE CHIP REGISTER 10: 1FH
11H ONE CHIP REGISTER 11: 00H
12H ONE CHIP REGISTER 12: 00H
13H ONE CHIP REGISTER 13: 38H
14H ONE CHIP REGISTER 14: 20H
15H ONE CHIP REGISTER 15: 00H
16H ONE CHIP REGISTER 16: 1DH
17H ONE CHIP REGISTER 17: 0FH
18H ONE CHIP REGISTER 18: 2FH
19H ONE CHIP REGISTER 19: 00H
1AH ONE CHIP REGISTER 1A: 90H
1BH ONE CHIP REGISTER 1B: 90H
1CH ONE CHIP REGISTER 1C: 90H
1DH ONE CHIP REGISTER 1D: 00H
1EH ONE CHIP REGISTER 1E: 00H
1FH ONE CHIP REGISTER 1F: 00H
20H VPOS_50 (VERTICAL POSITION) 4/3 50 Hz. 12H
21H VAMP_50 (VERTICAL AMPLITUDE) 4/3 50 Hz 0FH
22H VPOS_60 (VERTICAL POSITION) 4/3 60 Hz 0FH
23H VAMP_60 (VERTICAL AMPLITUDE) 4/3 60 Hz 0FH
24H HSHIFT_60 (HORIZONTAL SHIFT) 60Hz 1DH
25H HSHIFT_50 (HORIZONTAL SHIFT) 50Hz 22H
26H FINVFH: STEP FOR FINE TUNING IN VHF BAND 00H
27H VHF1_STEP: THICK TUNING STEP FOR VHF1 BAND F3H
28H VHF3_STEP: THICK TUNING STEP FOR VHF3 BAND 64H
29H UHF_STEP: THICK TUNING STEP FOR UHF BAND 64H
2AH LP_COARSE: THICK TUNING ADJUSTMENT FOR L’ 02H
2BH BG_COARSE: THICK TUNING ADJUSTMENT FOR L AND BG 0AH
2CH BG_FINE: FINE TUNING ADJUSTMENT FOR L AND BG 00H
2DH LP_FINE: FINE TUNING ADJUSTMENT FOR L’ 00H
2EH DELAY SEARCH:
XXXXXXX0 -> SHOWS ‘PROGRAMME –‘
DURING AUTOSEARCH.
XXXXXXX1 -> DHOWS ‘AUTO SEARCH’
DURING AUTOSEARCH
00H

8
37GQ-20FP
2FH VHF1_SP: STEP FOR AUTO SEARCH IN VHF1 BAND 17H
30H VHF3_SP: STEP FOR AUTO SEARCH IN VHF3 BAND 0AH
31H UHF_SP: STEP FOR AUTO SEARCH IN VHF BAND 06H
32H OLD_PROGRAM: FOR FLASHBACK RETURN 0AH
33H UHFHIGH: UPPER WINDOW LIMIT FOR UHF 01H
34H VHF3HIGH: UPPER WINDOW LIMIT FOR VHF3 01H
35H VHF1HIGH: UPPER WINDOW LIMIT FOR VHF1 01H
36H PRG_NUMBER: CURRENT PROGRAMME NUMBER 08H
37H WAITSUP: UPPER LIMIT DELAY TIME FOR AUTOSEARCH. 0FH
38H WAITINF: LOWER LIMIT DELAY TIME FOR AUTOSEARCH 03H
3BH SCART BLOKING:
-00H = NO SCARTBLOCKING
-01H = SCART BLOCKING WHEN ANY PR. IS IN CHILD
LOCK MODE.
00H
Do not use.
Just for
UK models
3CH RET_COL: DELAY IN COLOUR IDENTIFICATION IN AUTO
MODE. 40H
3FH CHECKSUM 35H
05H 00H ONE CHIP REGISTER 00: 80H
01H ONE CHIP REGISTER 01: 30H
02H ONE CHIP REGISTER 02: 9FH
03H ONE CHIP REGISTER 03: 2DH
04H ONE CHIP REGISTER 04: 00H
05H ONE CHIP REGISTER 05: B6H
06H ONE CHIP REGISTER 06: 00H
07H ONE CHIP REGISTER 07: 32H
08H ONE CHIP REGISTER 08: 19H
09H ONE CHIP REGISTER 09: 99H
0AH ONE CHIP REGISTER 0A: 3CH
0BH ONE CHIP REGISTER 0B: B2H
0CH ONE CHIP REGISTER 0C: 2EH
0DH ONE CHIP REGISTER 0D: 24H
0EH ONE CHIP REGISTER 0E: 22H
0FH ONE CHIP REGISTER 0F: 18H
10H ONE CHIP REGISTER 10: 1FH
11H ONE CHIP REGISTER 11: 00H
12H ONE CHIP REGISTER 12: 00H
13H ONE CHIP REGISTER 13: 38H
14H ONE CHIP REGISTER 14: 20H
15H ONE CHIP REGISTER 15: 00H
16H ONE CHIP REGISTER 16: 1DH
17H ONE CHIP REGISTER 17: 0FH
18H ONE CHIP REGISTER 18: 2FH
19H ONE CHIP REGISTER 19: 00H
1AH ONE CHIP REGISTER 1A: 90H
1BH ONE CHIP REGISTER 1B: 90H
1CH ONE CHIP REGISTER 1C: 90H
1DH ONE CHIP REGISTER 1D: 00H
1EH ONE CHIP REGISTER 1E: 00H
1FH ONE CHIP REGISTER 1F: 00H
20H VPOS_50 (VERTICAL POSITION) 4/3 50 Hz. 12H
21H VAMP_50 (VERTICAL AMPLITUDE) 4/3 50 Hz 0FH
22H VPOS_60 (VERTICAL POSITION) 4/3 60 Hz 0FH
23H VAMP_60 (VERTICAL AMPLITUDE) 4/3 60 Hz 0FH
24H HSHIFT_60 (HORIZONTAL SHIFT) 60Hz 1DH
25H HSHIFT_50 (HORIZONTAL SHIFT) 50Hz 22H
26H FINVFH: STEP FOR FINE TUNING IN VHF BAND 00H
27H VHF1_STEP: THICK TUNING STEP FOR VHF1 BAND F3H
28H VHF3_STEP: THICK TUNING STEP FOR VHF3 BAND 64H
29H UHF_STEP: THICK TUNING STEP FOR UHF BAND 64H
2AH LP_COARSE: THICK TUNING ADJUSTMENT FOR L’ 02H

9
37GQ-20FP
••
••
•PIF/AGC Adjustement ••
••
•Screen Adjustement
Apply mains voltage of 220V AC/50HZ to TV.1. Receive Philips pattern signal to a level
between 60 and 80 dBµV.
2.
Set contrast to 10/10, brightness to 5/10
and colour 0/10.
3.
Adjust focus potentiometer to obtain
maximum definition.
4.
4. Focus Adjustment
1. B/G AFT Adjustment
Connect the output of SSG (Standard Signal
Generator)tothe tuner IF output terminal.
•SSG output 38.9 MHz (CW)± 5 KHz.
•SSG output level: approx. 90 dBµV.
1.
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
memorized.
4.
2. L/L’ AFT Adjustment
Connect the output of SSG (Standard Signal
Generator) to the turner IF output terminal.
•SSG output 34.47MHz (CW) ± 5 KHz.
•SSG output level: approx. 90 dBµV.
1.
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
memorized.
4.
Receive the «COLOUR BAR» signal (Channel E-
12). Signal strength: 57 dBµV.
1.
Enter into Service Mode.
2.
3. RF-AGC STR Adjustment
Push CH until AGC STR appears on screen.
3.
4.Push «7» key of R/C.«AGC OK» will appear.
Switch set OFF and ON again, setting is now
memorized.
5.
5. G2 Adjustment
Apply mains voltage of 220V AC/50HZ to TV.
1.Receive cross hatch pattern signal to a level
between 60 and 80 dBµV.
2.
Apply High Voltage Probe to Pin 8 of CRT socket
3.
4.Adjust G2 potentiometer until obtaining 525V
±10%.
5.Check BKGD. If it is necessary adjust BKGD
according to instructions detailed in the next
page.
2BH BG_COARSE: THICK TUNING ADJUSTMENT FOR L AND BG 05H
2CH BG_FINE: FINE TUNING ADJUSTMENT FOR L AND BG 80H
2DH LP_FINE: FINE TUNING ADJUSTMENT FOR L’ 80H
2EH DELAY SEARCH:
XXXXXXX0 -> SHOWS ‘PROGRAMME –‘
DURING AUTOSEARCH.
XXXXXXX1 -> DHOWS ‘AUTO SEARCH’
DURING AUTOSEARCH
00H
2FH VHF1_SP: STEP FOR AUTO SEARCH IN VHF1 BAND 17H
30H VHF3_SP: STEP FOR AUTO SEARCH IN VHF3 BAND 0AH
31H UHF_SP: STEP FOR AUTO SEARCH IN VHF BAND 06H
32H OLD_PROGRAM: FOR FLASHBACK RETURN 0AH
33H UHFHIGH: UPPER WINDOW LIMIT FOR UHF 01H
34H VHF3HIGH: UPPER WINDOW LIMIT FOR VHF3 01H
35H VHF1HIGH: UPPER WINDOW LIMIT FOR VHF1 01H
36H PRG_NUMBER: CURRENT PROGRAMME NUMBER 08H
37H WAITSUP: UPPER LIMIT DELAY TIME FOR AUTOSEARCH. 0FH
38H WAITINF: LOWER LIMIT DELAY TIME FOR AUTOSEARCH 03H
3Bh SCART BLOKING:
-00H = NO SCARTBLOCKING
-01H = SCART BLOCKING WHEN ANY PR. IS IN CHILD
LOCK MODE.
00H
Do not use.
Just for
UK models
3CH RET_COL: DELAY IN COLOUR IDENTIFICATION IN AUTO
MODE. 40H
3FH CHECKSUM 35H

10
37GQ-20FP
1. HOR POS
a) Receive Philips pattern signal.
b) When ∧button is pressed, picture moves to the left.
c) When ∨button is pressed, picture moves to the right.
d) Adjust the horizontal location to obtain picture centering (Fig.1).
•GEOMETRY ADJUSTMENT PROCEDURE
2. VERT POS
a) Receive Philips pattern signal.
b) When ∧button is pressed, picture moves up.
c) When ∨button is pressed, picture moves down.
d) Adjust the vertical location to obtain picture centering (Fig.2).
3. VERT AM
a) Receive Philips pattern signal.
b) When ∧button is pressed, vertical size of picture increases.
c) When ∨button is pressed, vertical size of picture decreases.
d) Adjust the vertical size to obtain picture overscan (Fig.3).
The following adjustments are requiered when the Picture Tube or IC801 are replaced,
or may be necessary after adjustment of the G2 voltage.
1. «B-GAIN», «G-GAIN»
a) Adjust G2.
b) Tune a grey scale pattern.
c) Adjust colour to minimum.
d) Fix R-GAIN value to 50.
e) Position colourmeter in the the left point of Fig.4.
f) Using brightness and contrast buttons, select a luminance of ≈120 nits.
g) Operate again in Service Mode and select location B-GAIN and
G-GAIN to obtain colour coordinates:
X = 0.290 ±0.015
Y = 0.284 ±0.015
h) Exit Service Mode and check colour coordinates «X» and «Y» at 20 and 120 nits. It may be
necessary to repeat the same procedure or re-adjust the cuts as show the be below one.
2. «G-DC», «R-DC»
a) Adjust G2, in the case that it has not been made previously.
b) Tune a grey scale pattern.
c) Adjust colour to minimum.
e) Position colourmter in the the right point of Fig.4.
f) Using brightness and contrast buttons, select a luminance of ≈20 nits.
g) Operate again in Service Mode and select location G-DC and R-DC to obtain colour
coordinates: X = 0.290 ±0.015
Y = 0.284 ±0.015
h) Exit Service Mode and check colour coordinates «X» and «Y» at 20 and 120 nits. It may be
necessary to repeat the same procedure or the previous one.
•COLOUR ADJUSTMENT (BKGD) PROCEDURES
NOTE: Locations «R» alter «X» coordinates; «G» alter «Y» coordinates; «B» alter «X» and «Y»
coordinates.
Fig. 2
Fig. 1
Fig. 3
Fig. 4
3 7 4 0
6 5 4 3 2 1 0
(0: Black ... 7: White)
Gain point
DC point