Sharp 37GQ-20H Bedienungsanleitung

37GQ-20H

SERVICE MANUAL

SHARP CORPORATION

CONTENTS

PAL SYSTEM COLOUR TELEVISION

SEJB37GQ20H02

SQUAD CHASSIS

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-20H

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

37GQ-20H

IMPORTANT SERVICE NOTES

SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE

Maintenance and repair of this receiver should be done by qualified service personnel only.

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. To keep the set in a normal operation, be sure to make it function on 22.4KV±1.5KV (at beam

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.

BEFORE RETURNING THE RECEIVER

Inadditiontotheabovechecks,thefollowingsafetychecksshouldalsobecarriedoutbefore 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

lodged 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.

37GQ-20H

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.

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∼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.

37GQ-20H

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.

05H

3FH DIODE2_NVM:

XXXXXXX1 -> FRENCH STANDARD

XXXXX01X -> BG STANDARD

XXXXX10X -> L/L’ STANDARD

XX1XXXXX -> AUDIO FOR UK

X1XXXXXX -> AUTOINSTALLATION ON

1XXXXXXX -> ONLY UHF BAND.

A0H

01H 00H ZONE FOR TUNNING INFORMATION (BEGIN) 10H

3BH ZONE FOR TUNNING INFORMATION (END) 10H

3DH UHFLOW: LOW WINDOW LIMIT FOR UHF BAND 80H

3EH VHF3LOW: LOW WINDOW LIMIT FOR VHF3 BAND 80H

3FH VHF1LOW: LOW WINDOW LIMIT FOR VHF1 BAND 80H

02H 00H RESERVED ZONE FOR PROGRAMME NAMES (BEGIN) 24H

3FH RESERVED ZONE FOR PROGRAMME NAMES (END) 24H

37GQ-20H

03H 00H ONE CHIP REGISTER 00: 80H

01H ONE CHIP REGISTER 01: 05H

02H ONE CHIP REGISTER 02: 9FH

03H ONE CHIP REGISTER 03: 20H

04H ONE CHIP REGISTER 04: 00H

05H ONE CHIP REGISTER 05: BAH

06H ONE CHIP REGISTER 06: 42H

07H ONE CHIP REGISTER 07: 32H

08H ONE CHIP REGISTER 08: 19H

09H ONE CHIP REGISTER 09: 99H

0AH ONE CHIP REGISTER 0A: 32H

0BH ONE CHIP REGISTER 0B: B2H

0CH ONE CHIP REGISTER 0C: 32H

0DH ONE CHIP REGISTER 0D: 20H

0EH ONE CHIP REGISTER 0E: 20H

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: 20H

14H ONE CHIP REGISTER 14: 20H

15H ONE CHIP REGISTER 15: 00H

16H ONE CHIP REGISTER 16: 1FH

17H ONE CHIP REGISTER 17: 20H

18H ONE CHIP REGISTER 18: 2BH

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 A4H

28H VHF3_STEP: THICK TUNING STEP FOR VHF3 BAND 85H

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 0AH

30H VHF3_SP: STEP FOR AUTO SEARCH IN VHF3 BAND 05H

31H UHF_SP: STEP FOR AUTO SEARCH IN UHF BAND 03H

32H OLD_PROGRAM: FOR FLASHBACK RETURN 00H

33H UHFHIGH: UPPER WINDOW LIMIT FOR UHF 00H

34H VHF3HIGH: UPPER WINDOW LIMIT FOR VHF3 00H

37GQ-20H

35H VHF1HIGH: UPPER WINDOW LIMIT FOR VHF1 00H

36H PRG_NUMBER: CURRENT PROGRAMME NUMBER 01H

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

V2 µProc.

Version or

upper.

3CH RET_COL: DELAY IN COLOUR IDENTIFICATION IN AUTO

MODE. 40H

3FH CHECKSUM 7EH

04H 00H ONE CHIP REGISTER 00: 80H

01H ONE CHIP REGISTER 01: 05H

02H ONE CHIP REGISTER 02: 9FH

03H ONE CHIP REGISTER 03: 20H

04H ONE CHIP REGISTER 04: 00H

05H ONE CHIP REGISTER 05: BAH

06H ONE CHIP REGISTER 06: 42H

07H ONE CHIP REGISTER 07: 32H

08H ONE CHIP REGISTER 08: 19H

09H ONE CHIP REGISTER 09: 99H

0AH ONE CHIP REGISTER 0A: 32H

0BH ONE CHIP REGISTER 0B: B2H

0CH ONE CHIP REGISTER 0C: 32H

0DH ONE CHIP REGISTER 0D: 20H

0EH ONE CHIP REGISTER 0E: 20H

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: 20H

14H ONE CHIP REGISTER 14: 20H

15H ONE CHIP REGISTER 15: 00H

16H ONE CHIP REGISTER 16: 1FH

17H ONE CHIP REGISTER 17: 20H

18H ONE CHIP REGISTER 18: 2BH

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 A4H

28H VHF3_STEP: THICK TUNING STEP FOR VHF3 BAND 85H

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

37GQ-20H

2FH VHF1_SP: STEP FOR AUTO SEARCH IN VHF1 BAND 0AH

30H VHF3_SP: STEP FOR AUTO SEARCH IN VHF3 BAND 05H

31H UHF_SP: STEP FOR AUTO SEARCH IN VHF BAND 03H

32H OLD_PROGRAM: FOR FLASHBACK RETURN 00H

33H UHFHIGH: UPPER WINDOW LIMIT FOR UHF 00H

34H VHF3HIGH: UPPER WINDOW LIMIT FOR VHF3 00H

35H VHF1HIGH: UPPER WINDOW LIMIT FOR VHF1 00H

36H PRG_NUMBER: CURRENT PROGRAMME NUMBER 01H

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

V2 µProc.

Version or

upper.

3CH RET_COL: DELAY IN COLOUR IDENTIFICATION IN AUTO

MODE. 40H

3FH CHECKSUM 7EH

05H 00H ONE CHIP REGISTER 00: 80H

01H ONE CHIP REGISTER 01: 05H

02H ONE CHIP REGISTER 02: 9FH

03H ONE CHIP REGISTER 03: 20H

04H ONE CHIP REGISTER 04: 00H

05H ONE CHIP REGISTER 05: BAH

06H ONE CHIP REGISTER 06: 42H

07H ONE CHIP REGISTER 07: 32H

08H ONE CHIP REGISTER 08: 19H

09H ONE CHIP REGISTER 09: 99H

0AH ONE CHIP REGISTER 0A: 32H

0BH ONE CHIP REGISTER 0B: B2H

0CH ONE CHIP REGISTER 0C: 32H

0DH ONE CHIP REGISTER 0D: 20H

0EH ONE CHIP REGISTER 0E: 20H

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: 20H

14H ONE CHIP REGISTER 14: 20H

15H ONE CHIP REGISTER 15: 00H

16H ONE CHIP REGISTER 16: 1FH

17H ONE CHIP REGISTER 17: 20H

18H ONE CHIP REGISTER 18: 2BH

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 A4H

28H VHF3_STEP: THICK TUNING STEP FOR VHF3 BAND 85H

29H UHF_STEP: THICK TUNING STEP FOR UHF BAND 64H

2AH LP_COARSE: THICK TUNING ADJUSTMENT FOR L’ 02H

37GQ-20H

••

•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.

Set contrast to 10/10, brightness to 5/10

and colour 0/10.

Adjust focus potentiometer to obtain

maximum definition.

3. Focus Adjustment

1. B/G AFT Adjustment

Connect the output of SSG (Standard Signal

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

memorized.

Receive the«CROSS HATCH»signal(Channel I-

42). Signal strength: 57 dBµV.

Enter into Service Mode.

2. RF-AGC STR Adjustment

Push CH until AGC STR appears on screen.

4.Push «7» key of R/C.«AGC OK» will appear.

Switch set OFF and ON again, setting is now

memorized.

4. G2 Adjustment

Apply mains voltage of 220V AC/50HZ to TV.

1.Receivethe «CROSSHATCH»patternsignal to a

levelbetween 60and80 dBµV.

Apply High Voltage Probe to Pin 8 of CRT socket

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 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 0AH

30H VHF3_SP: STEP FOR AUTO SEARCH IN VHF3 BAND 05H

31H UHF_SP: STEP FOR AUTO SEARCH IN VHF BAND 03H

32H OLD_PROGRAM: FOR FLASHBACK RETURN 00H

33H UHFHIGH: UPPER WINDOW LIMIT FOR UHF 00H

34H VHF3HIGH: UPPER WINDOW 00H

35H VHF1HIGH: UPPER WINDOW LIMIT FOR VHF1 00H

36H PRG_NUMBER: CURRENT PROGRAMME NUMBER 01H

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

V2 µProc.

Version or

upper.

3CH RET_COL: DELAY IN COLOUR IDENTIFICATION IN AUTO

MODE. 40H

3FH CHECKSUM 7EH

37GQ-20H

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 required 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

37GQ-20H

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