Sharp 37GQ-20H Service Manual page 8

Pal system colour television
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2BH
2CH
2DH
2EH
2FH
30H
31H
32H
33H
34H
35H
36H
37H
38H
3Bh
3CH
3FH
• • • • • PIF/AGC Adjustement
1. B/G AFT Adjustment
.
Connect the output of SSG (Standard Signal
1
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
4
memorized.
2. RF-AGC STR Adjustment
.
Receive the «CROSS HATCH» signal (Channel I-
1
42). Signal strength: 57 dBµV.
.
Enter into Service Mode.
2
.
Push CH until AGC STR appears on screen.
3
.
4
Push «7» key of R/C.«AGC OK» will appear
.
5
Switch set OFF and ON again, setting is now
memorized.
BG _COA RSE: TH IC K TU NING AD JU STM ENT FOR L AN D BG
BG _FIN E: FIN E TU NING AD JU STM ENT FOR L AN D BG
LP_FINE : FINE TUN IN G A DJUST ME NT FO R L'
DE LAY SEAR CH:
X XXX XXX 0 -> SHO W S 'P ROG RAM M E –'
X XXX XXX 1 -> DH OW S 'AUT O SEA RC H'
VH F1_SP: STEP FO R AU TO SEAR CH IN VHF1 BAN D
VH F3_SP: STEP FO R AU TO SEAR CH IN VHF3 BAN D
UH F_SP: STEP FO R A UTO SEA RCH IN VH F BAN D
OL D_PRO GR AM : F OR FL ASH BAC K RE TUR N
UH FHIGH : U PPER WIND OW L IM IT FOR UH F
VH F3HIGH : U PPER WIN DO W
VH F1HIGH : U PPER WIN DO W L IM IT FOR VHF 1
PRG _NUM B ER: CU RREN T PRO GR AM M E NU M BER
W AITSUP : U PPER L IM IT D ELAY TIM E FOR A UTO SEA RCH .
W AITINF: LO WE R LIMIT D ELA Y TIM E FO R AU TOSE AR CH
SCA RT B LOK IN G:
-
00H = NO SCAR TBLO CKIN G
-
01H = SCA RT BLO CK IN G W H EN A NY PR. IS IN CHILD
LO CK M OD E.
RET _COL : D ELAY IN CO LOU R IDEN TIFICAT IO N IN A UTO
M OD E.
CH ECK SUM
.
.
9
D URING AU TOSEA RCH .
DU RING AUT OSEA RCH
• • • • • Screen Adjustement
3. Focus Adjustment
1.
Apply mains voltage of 220V AC/50HZ to TV.
Receive Philips pattern signal to a level
.
2
between 60 and 80
dB
.
Set contrast to 10/10, brightness to 5/10
3
and colour 0/10.
Adjust focus potentiometer to obtain
.
4
maximum definition.
4. G2 Adjustment
Apply mains voltage of 220V AC/50HZ to TV.
1.
.
Receive the «CROSS HATCH» pattern signal to a
2
level between 60 and 80 dBµV.
.
Apply High Voltage Probe to Pin 8 of CRT socket
3
Adjust G2 potentiometer until obtaining 525V
.
4
±10%.
.
Check BKGD. If it is necessary adjust BKGD
5
according to instructions detailed in the next
page.
37GQ-20H
0AH
00H
00H
00H
0AH
05H
03H
00H
00H
00H
00H
01H
0FH
03H
00H
V2 µ Proc.
Version or
upper.
40H
7EH
µ
V.

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