Sharp 37GQ-20S Manual de usuario

37GQ-20S

37GQ-21S

MODELS:

37GQ-20S

37GQ-21S

SHARP CORPORATION

PAL SYSTEM COLOUR TELEVISION

SEJB37GQ2*S02

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.

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......................23

CONTENTS

37GQ-20S

37GQ-21S

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 8550 degree K-20 MPCD screen

temperature should not exceed 15% of its original value.

X=0.290 Y=0.300

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.

•Aerial Input Impedance

VHF/UHF...........................75 ohm Unbalanced

•Tuning Ranges

CATV Special Channels

B/G............................48.25MHzthru855.25MHz

•Picture Intermediate Frecuencies

B/G...........................................................38.9MHz

•Sound Carrier Trap

B/G.......................................................33.4MHz

•Adjacent Sound Carrier Trap

B/G.............................................................40.4MHz

•Adjacent Picture Carrier Trap

B/G.......................................................30.9MHz

MODEL DESTINATION & DIFFERENCES:

37GQ-20S DE: Autria

37GQ-20S DES: Germany (Silver)

37GQ-20S ES: Spain

37GQ-20SIT: Italy

37GQ-20SNL: Holland

37GQ-20S SE: Sweden

37GQ-21S ESY: Spain (Yellow, with headphones)

37GQ-21S ESR: Spain (Red, with headphones)

37GQ-20S

37GQ-21S

SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE

Maintenanceandrepairofthisreceivershouldbedonebyqualifiedservicepersonnelonly.

Whenservicingthehighvoltagesystem,removestaticcharge fromitbyconnecting a10Kohmresistorin

serieswithaninsulated wire (suchastest probe) between picturetube ground tag andhigh voltage lead.

(AClinecordshould be disconnectedfromAC outlet).

1.The Picture tube inthisreceiveremploysIntegralImplosionprotection.

2.Replacewithtube of the same typenumberfor continued safety.

3.Do not liftpicture tubeby the neck.

4.Handle the picturetubeonlywhenwearingshatterproofgogglesand after dischargingthehigh

voltagecompletely.

X-RAY

ThisreceiverisdesignedsothatanyX-Rayradiationiskepttoanabsoluteminimum.Sincecertainmalfunctions

andservicingmayproducepotentiallyhazardousradiationwithprolongedexposureatcloserange,thefollowing

precautionsshouldbeobserved:

1.When repairing the circuit,be sure notto increasethe highvoltage to morethan 25.5KV, (at beam

1000µΑ) for the set.

2. To keepthe set in anormal operation, be sureto make it functionon 22.4KV±1.5KV(at beam

800µΑ) in thecase of theset.The sethas beenfactory - adjustedto the abovementionedhigh

voltage.Alwayscheckthehighvoltage if there is any possibility that it might have changed as a

resultof therepair.

3.Donotsubstitute a picture tubewithunauthorized types and/or brandswhichmay cause excess

X-Ray radiation.

BEFORE RETURNING THE RECEIVER

Inadditiontotheabovechecks,thefollowingsafetychecksshouldalsobecarriedoutbefore returningthe

unittotheuser.

1.Inspect all leadsanddress to makecertainthat theleads arenot pinchedor thathardwareis not

lodgedbetween thechassisand othermetal parts.

2.Inspectall protective devices such as non-metallic control knobs, insulating fish papers, cabinet

backs, adjustment andcompartmentcovers or shields,insolationresistor-capacity networks,

mechanicalinsulators etc.

IMPORTANT SERVICE NOTES

37GQ-20S

37GQ-21S

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-20S

37GQ-21S

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%

00H

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.

00H

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

37GQ-20S

37GQ-21S

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: CCH

06H ONE CHIP REGISTER 06: 44H

07H ONE CHIP REGISTER 07: 34H

08H ONE CHIP REGISTER 08: 21H

09H ONE CHIP REGISTER 09: A1H

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: 15H

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 55H

29H UHF_STEP: THICK TUNING STEP FOR UHF BAND 55H

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 02H

33H UHFHIGH: UPPER WINDOW LIMIT FOR UHF 01H

34H VHF3HIGH: UPPER WINDOW LIMIT FOR VHF3 01H

37GQ-20S

37GQ-21S

35H VHF1HIGH: UPPER WINDOW LIMIT FOR VHF1 01H

36H PRG_NUMBER: CURRENT PROGRAMME NUMBER 03H

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 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: CCH

06H ONE CHIP REGISTER 06: 44H

07H ONE CHIP REGISTER 07: 34H

08H ONE CHIP REGISTER 08: 21H

09H ONE CHIP REGISTER 09: A1H

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 55H

29H UHF_STEP: THICK TUNING STEP FOR UHF BAND 55H

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-20S

37GQ-21S

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 02H

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 03H

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 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: CCH

06H ONE CHIP REGISTER 06: 44H

07H ONE CHIP REGISTER 07: 34H

08H ONE CHIP REGISTER 08: 21H

09H ONE CHIP REGISTER 09: A1H

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 55H

29H UHF_STEP: THICK TUNING STEP FOR UHF BAND 55H

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

37GQ-20S

37GQ-21S

••

•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)tothe 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 «COLOUR BAR» signal (Channel E-

12). Signal strength: 57 dBµV.

Enter into Service Mode.

2.RF-AGCSTR 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.Receive cross hatch pattern signal to a level

between 60 and 80 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 02H

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 03H

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 7EH

37GQ-20S

37GQ-21S

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 = 0.300±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 = 0.300±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

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