Read Sharp 37GQ-20 Service Manual online
9
37GQ-20IR
•••••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
between 60 and 80
dB
µ
V.
2
.
Set contrast to 10/10, brightness to 5/10
and colour 0/10.
and colour 0/10.
3
.
Adjust focus potentiometer to obtain
maximum definition.
maximum definition.
4
.
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.
Generator) to the 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.
memorized.
4
.
4. G2 Adjustment
Apply mains voltage of 220V AC/50HZ to TV.
1.
Receive the «CROSS HATCH» pattern signal to a
level between 60 and 80 dB
level between 60 and 80 dB
µV.
2
.
Apply High Voltage Probe to Pin 8 of CRT socket
3
.
4
.
Adjust G2 potentiometer until obtaining 525V
±10%.
±10%.
5
.
Check BKGD. If it is necessary adjust BKGD
according to instructions detailed in the next
page.
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 –‘
XXXXXXX0 -> SHOWS ‘PROGRAMME –‘
DURING AUTOSEARCH.
XXXXXXX1 -> DHOWS ‘AUTO SEARCH’
DURING AUTOSEARCH
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
08H
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
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
3CH
RET_COL: DELAY IN COLOUR IDENTIFICATION IN AUTO
MODE.
MODE.
40H
3FH
CHECKSUM
91H
Receive the «COLOUR BAR» signal (Channel E-
12).
12).
Signal strength: 57 dBµV.
1
.
Enter into Service Mode.
2
.
2. 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.
memorized.
5
.
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