Service manual

9
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.
2.
Set contrast to 10/10, brightness to 5/10
and colour 0/10.
3
.
Adjust focus potentiometer to obtain
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.
•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.
Receive the «CROSS HATCH» signal (Channel I-
42). 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.
5.
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 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 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
µ
Proc.
Version or
upper.
3CH RET_COL: DELAY IN COLOUR IDENTIFICATION IN AUTO
MODE.
40H
3FH CHECKSUM 7EH