Sharp 37GQ-20 (serv.man5) Service Manual ▷ View 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
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
10
37GQ-20H
1. HOR POS
a) Receive Philips pattern signal.
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.
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.
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.
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
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:
G-GAIN to obtain colour coordinates:
X = 0.290
±
0.015
Y = 0.284
±
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.
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
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:
coordinates:
X = 0.290
±
0.015
Y = 0.284
±
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.
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.
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
11
37GQ-20H
J50
(K)
1
5
J94
C223
C726
C1014
FB801
JL3.
JL3
L5
FB403
FB402
F401
Q703
JF11
JF14
JF13
S1
J40
D801
D603
R816
JL2
JL2.
JL1.
J67
J82
R1013
R511
J39
J58
J57
J90
J35
J34
J21
J3
J89
+
C717
C722
+
R716
D717
C878
+
C721
R701
C718
J88
B
Q502
E
+
C815
J48
+
C817
J42
C814
+
+
C803
L801
J87
J63
J60
+
C819
R302
J2
J1
J85
C
E
R720
E
C
J5
R516
R530
J83
J71
C503
+
C312
+
C303
R315
D301
5
1
(K).
(S)
1
+
C304
FB301
J302
4
2
6
5
3
1
7
K7288BM
L301
E
C
R862
E
Q885
B
J301
4
2
6
5
3
1
7
D704
F701
(G)
2
1
S701
+
C711
C603
+
R710
J16
J52
C1001
+
J9
J8
J69
C508
J22
R529
J72
R604
A
E
C
B
Q601
C602
D606
(F)
1
2
3
4
5
1
X1001
T3.15AH
R708
R707
T701
1
7
8
14
C709
C
Q702
E
J38
3
4
5
6
7
8
9
CRT
R866
E
Q871
B
(L3)
CF201
1
+
C209
D201
C205
+
+
C208
SF202
15
5
1
SF201
R610
R603
R607
T601
10
9
8
7
6
5
4
3
2
1
TU201
AGC
TU
AS
CL
DA
B+
33V
IF1
IF2
SC401
B
Q602
E
R605
R609
E
Q603
B
L601
R606
R402
C215
+
J68
J64
+
C801
J55
C805
+
+
C820
C207
+
RMC001
S1004
S1003
S1002
S1001
K
D1001
C1009
+
J6
J43
J44
K7287BM
F7287BMN1
F7288BMN1
ESPA¥A
R608
J32
C301
+
A
+
C406
X801
D202
D602
J45
J47
J53
L602
C401
+
1
(H).
4
C604
+
C605
J73
R714
C702
D702
PR701
C704
R406
J65
C703
D701
D703
(A)
3
2
1
R612
R617
C601
C609
R616
+
C608
TP601
TP602
R611
C713
+
D710
E
Q887
B
E
Q872
B
R883
G2
C876
B
Q883
E
R885
1
(H)
4
(SH)
(S).
B
Q870
E
R864
R305
C308 +
+
C307
C302
+
R304
R303
E
Q301
C
F7296BMN1
K7296BM
C874
Q302
D708
FB601
L202
C408
+
R536
J17
J15
D605
C607
+
D503
R523
R510
R502
E
Q501
B
R1011
R1012
R718
R709
R301
J12
D709
C712
+
J7
+
C714
D711
J84
IC1003
C
Q1001
E
R615
JF10
R618
L1001
1
3
IC1004
+
C705
C701
(L2)
R887
C879
L861
L4
+
C707
R702
R703
C725
J24
J29
J29
J28
J30
R819
R820
J86
R613
D604
JL1
J79
C509
Q707
J77
J78
J80
J91
J92
TP701
(SERVICE)
CLK
SCL
SDA
SER
DAT
GND
FB701
JF15
L701
JF12
R1027
R1028
R1029
JL1,
C710
+
FB702
D707
J81
R537
B
Q503
E
JL6
JL6.
C728
JL10
JL10.
C822
PRINTED WIRING BOARD (01 A Version)
Component side.
Component side.
1
I
H
G
F
E
D
C
B
A
2
3
4
5
6
7
12
37GQ-20H
J51
J50
C823
C825
C824
R815
J97
R888
(K)
5
1
R405
R404
R823
R824
C808
J59
J94
R538
Q509
R519
R812
R811
R810
R809
R808
R1032
FB801
R534
C507
K
D718
R721
R1020
C1011
R1024
JF18
FB404
C409
JF17
J61
R410 R412
R411
R409
D403
K
K
D408
R408
R826
R310
C315
FB403
FB402
F401
R417
R213
C1007
JF11
JF14
JF13
S1
R202
R415
Q204
R203
C222
C221 R220
J62
R416
J40
D801
R614
D603
R816
J67
R723
R724
R725
J82
D712
K
Q708
Q705
R1013
R511
J39
J58
J57
R212
J90
J35
J34
J21
C723
D706
K
K
D720
K
D716
K
D719
K
D705
C724
J3
J89
IC701
+
C717
C722
+
R715
R705
R706
R716
D717
C878
+
JF2
JF3
JF4
JF5
JF7
JF8
JF9
JF6
C721
R701
C718
J88
R321
R318
Q305
R509
B
E
Q502
C816
+
C815
R818
D803
K
D810
K
R821
R602
R601
R817
C818
J48
+
J42
D802
K
C814
+
R814
C804
+
C803
L801
J87
R822
C821
C807
J63
J60
+
C819
C806
C813
C812
C510
IC501
1
4
5
R533
R302
J2
J1
J85
C
E
R720
E
C
K
D714
R711
R711
J5
R1003
R1004
R517
R535
Q505
R516
R530
J83
J71
C503
R314
+
C312
+
C303
R315
D301
R1007
D808
K
D809
K
C810
C811
K
D807
K
D806
D805
K
D804
K
(K).
R221
(S)
1
+
C304
FB301
J302
Q304
L301
E
C
Q302
R862
Q885
E
B
J301
D708
K
D601
C611
D704
F701
2
1
(G)
S701
+
C711
C603
+
R710
R825
JF1
J16
J52
C1001
+
J9
J8
J69
C901
R813
R804
C508
K
D506
K
D505
J22
R529
J72
R604
B
E
C
Q601
C602
D606
(F)
1
2
3
4
5
X1001
C1006
R1009
C1010
1
R708
R707
T701
C709
Q702
C
E
J38
3
4
5
6
7
8
9
CRT
D860
K
C860
C871
R866
Q871
E
B
R879
R894
R201
CF201
+
C209
D201
C205
+
+C208
SF202
5
5
L203
C214
C213
C212
C211
R610
R603
R607
Q604
T601
IF2
IF1
33V
B+
TU
AGC
TU201
SC401
B
E
Q602
R605
R609
Q603
E
B
L601
R606
R402
1
16
32
33
48
IC801
L802
C215
+
J68
J64
C203
J56
C210
C202
R204
+
C801
J55
C201
L201
C805
+
+
C820
C802
+
C206
RMC001
S1004
S1003
S1002
S1001
K
D1001
C1009
+
J6
IC1001
R1016
R1017
R1002
R1001
J43
J44
C715
C207 SF201
R608
J32
C301
+
F7287BMN1
F7288BMN1
A
A
+
C406
D401
K
R512
R513
L1002
C1003 C1002
R802
R801
R803
R803
J54
C809
X801
C219
R216
R218
C220
C218
R217
Q203
R215
R207
R206
R214
C204
L205
R210
D202
Q202
Q201
R209
R208
L204
R205
C217
D602
J45
J47
J53
L602
C401
+
4
(H).
C604
+
C605
K
D402
R401
C404
C405
1
IC1002
J73
R714
C702
D702
PR701
C704
K
D404
K
D405
K
D406
D407
K
R406
R407
J65
R805
R806
R807
R807
C703
D701
D703
3
2
1
(A)
R612
R617
C601
C609
R616
+
C608
R611
C713
D710
Q887
E
B
R881
C873
Q872 E
B
C874
K
D812
R883
C876
B
E
Q883
R892
C862
D861
K
R885
1
4
(H)
C310
R317
L302
1
(SH)
(S).
R316
C311
R880
C872
B
E
Q870
R864
R893
D862
K
C861
R898
R305
+
R313
+
C307
C302
+
R304
R303
R306
R312
Q303
E
C Q301
R307
C309
R311
C308
FB601
R1023
R1008
R1018
D1002
K
L202
C408
+
R219
C313
C314
L303
R319
R536
J17
J15
D605
C607
+
D503
R515
R523
C509
R510
Q501
E
B
R1011
R1012
R718
R709
R301
J12
D709
C712
+
Q706
J7
+
C714
D711
J84
R719
IC1003
R1010
Q1001
R1025
R1019
R615
JF10
R618
L1001
C1012
IC1004
R1026
R1021
R1022
D1003
K
R1014
C1013
+
C705
C701
R887
C879
L861
+
C707
R702
R703
C725
R1005
R1006
J24
J29
J28
J30
J30
R819
R820
Q506
J86
R613
D604
C606
K
D607
J79
C817
Q707
Q703
R502
J77
J78
J80
J91
Q402
R419
R420
R418
Q401
R403
C610
Q701
R722
FB701
C708
JF15
L701
JF12
R1027
R1028
R1029
R1031
R1030
C710
+
FB702
D707
JF16
R320
R704
SDA
SCL
CLK
SER
DAT
GND
J92
C1008
R1015 R211
Q507
J81
R537
J19
B
E
Q503
D409
K
R222
R413
D410
K
D411
K
D412
K
R414
C1015
C1005
C1004
R1034
R1033
Q1003
Q1002
R524
R525
J93
C728
R726
C216
C224
C225
J96
D811
K
J103
R899
J98
PRINTED WIRING BOARD (N1 A Version)
Copper side.
Copper side.
1
I
H
G
F
E
D
C
B
A
2
3
4
5
6
7
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