Read Sharp 37GQ-20 (serv.man6) Service Manual online
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
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.
Generator) to the tuner IF output terminal.
•
SSG output 38.9 MHz (CW)
±
5 KHz.
•
SSG output level: approx. 90 dB
µ
V.
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
.
Receive the «CROSS HATCH» signal (Channel I-
42).
42).
Signal strength: 57 dB
µ
V.
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
.
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
µ
V.
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.
according to instructions detailed in the next
page.
2BH
BG _COA RSE: TH IC K TU NING AD JU STM ENT FOR L AN D BG
0AH
2CH
BG _FIN E: FIN E TU NING AD JU STM ENT FOR L AN D BG
00H
2DH
LP_FINE : FINE TUN IN G A DJUST ME NT FO R L’
00H
2EH
DE LAY SEAR CH:
X XXX XXX 0 -> SHO W S ‘P ROG RAM M E –‘
D URING AU TOSEA RCH .
X XXX XXX 1 -> DH OW S ‘AUT O SEA RC H’
DU RING AUT OSEA RCH
X XXX XXX 0 -> SHO W S ‘P ROG RAM M E –‘
D URING AU TOSEA RCH .
X XXX XXX 1 -> DH OW S ‘AUT O SEA RC H’
DU RING AUT OSEA RCH
00H
2FH
VH F1_SP: STEP FO R AU TO SEAR CH IN VHF1 BAN D
0AH
30H
VH F3_SP: STEP FO R AU TO SEAR CH IN VHF3 BAN D
05H
31H
UH F_SP: STEP FO R A UTO SEA RCH IN VH F BAN D
03H
32H
OL D_PRO GR AM : F OR FL ASH BAC K RE TUR N
00H
33H
UH FHIGH : U PPER WIND OW L IM IT FOR UH F
00H
34H
VH F3HIGH : U PPER WIN DO W L IM IT FOR VHF 3
00H
35H
VH F1HIGH : U PPER WIN DO W L IM IT FOR VHF 1
00H
36H
PRG _NUM B ER: CU RREN T PRO GR AM M E NU M BER
01H
37H
W AITSUP : U PPER L IM IT D ELAY TIM E FOR A UTO SEA RCH .
0FH
38H
W AITINF: LO WE R LIMIT D ELA Y TIM E FO R AU TOSE AR CH
03H
3Bh
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.
LO CK M OD E.
00H
V2
µ
Proc.
Version or
upper.
upper.
3CH
RET _COL : D ELAY IN CO LOU R IDEN TIFICAT IO N IN A UTO
M OD E.
M OD E.
40H
3FH
CH ECK SUM
7EH
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