Sharp 37GQ-20 (serv.man5) Service Manual ▷ View online
13
37GQ-20H
WAVEFORM MEASUREMENT CONDITION:
Colour bar genetator signal of 70 dB from RF input.
Colour bar genetator signal of 70 dB from RF input.
1. The unit of resistance «ohm»is omitted (K=1000
ohms. M= Megaohm).
2. All resistors are 1/8 watt. unless otherwise noted.
3. All capacitors are
ohms. M= Megaohm).
2. All resistors are 1/8 watt. unless otherwise noted.
3. All capacitors are
µ
F, unless otherwise noted (P=
µµ
F).
4. The capacitor with Part No. RC-FZ9XXXBMNJ is
designed to with stand 63V.
designed to with stand 63V.
NOTE:
SERVICE PRECAUTION:
DESCRIPTION OF SCHEMATIC DIAGRAM
SAFETY NOTE:
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.
2. SEMICONDUCTOR HEAT SINKS SHOULD BE
REGARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.
REGARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.
IMPOTANT SAFETY NOTE:
PARTS MARKED WITH «
» (
) ARE
IMPORTANT FOR MAINTAINING THE SAFETY
OF THE SET. BE SURE TO REPLACE THESE
PARTS WITH SPECIFIED ONES FOR
MAINTAINING THE SAFETY AND PERFORMAN-
CE OF THE SET.
OF THE SET. BE SURE TO REPLACE THESE
PARTS WITH SPECIFIED ONES FOR
MAINTAINING THE SAFETY AND PERFORMAN-
CE OF THE SET.
!
CAUTION
This circuit diagram is original one,
therefore there may be slight difference
from yours.
This circuit diagram is original one,
therefore there may be slight difference
from yours.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CH1 100V A 2
µ
s 200V VERT
CH1 FREQ = 100KHz
CH1 P-P = 504 V
CH1 P-P = 504 V
CH1 100V A 2
µ
s 100V VERT
CH1 FREQ = 100KHz
CH1 P-P = 472 V
CH1 P-P = 472 V
CH1 2V A 10
µ
s -1.00V VERT
CH1 FREQ = 15.6KHz
CH1 P-P = 8.56 V
CH1 P-P = 8.56 V
CH1 200V A 10
µ
s 200V VERT
CH1 FREQ = 15.6KHz
CH1 P-P = 1.00 kV
CH1 P-P = 1.00 kV
CH1 1V A 10
µ
s 1.00V VERT
CH1 FREQ = 15.6KHz
CH1 P-P = 5.40 V
CH1 P-P = 5.40 V
CH1 1V A 5ms 2.50 V VERT
THE AREA ENCLOSED BY THIS LINE ( )
IS DIRECTLY CONNECTED WITH AC MAINS
VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN
ISOLATING TRANSFORMER BETWEEN TV
RECEIVER AND AC LINE TO ELIMINATE
HAZARD OF ELECTRIC SHOCK.
IS DIRECTLY CONNECTED WITH AC MAINS
VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN
ISOLATING TRANSFORMER BETWEEN TV
RECEIVER AND AC LINE TO ELIMINATE
HAZARD OF ELECTRIC SHOCK.
CH1 FREQ = 50.0 Hz
CH1 P-P = 4.80 V
CH1 P-P = 4.80 V
CH1 500mV A 5ms 1.00V VERT
CH1 FREQ = 50.0 Hz
CH1 P-P = 1.48 V
CH1 P-P = 1.48 V
CH1 500mV A 5ms -500mV VERT
CH1 FREQ = 50.0 Hz
CH1 P-P = 1.94 V
CH1 P-P = 1.94 V
CH1 10V A 5ms -10.0mV VERT
CH1 FREQ = 50.0 Hz
CH1 P-P = 38.4 V
CH1 P-P = 38.4 V
CH1 1V A 5ms 2.50 V VERT
CH1 FREQ = 1.00 KHz
CH1 P-P = 4.44 V
CH1 P-P = 4.44 V
CH1 5V A 500
µ
s 0.0 V VERT
CH1 FREQ = 412 Hz
CH1 P-P = 16.8 V
CH1 P-P = 16.8 V
CH1 500mV A 10
µ
s TVFLD 25
CH1 FREQ = 15.6 KHz
CH1 P-P = 1.84 V
CH1 P-P = 1.84 V
CH1 20V A 10
µ
s 150 V VERT
CH1 FREQ = 15.6 KHz
CH1 P-P = 74.4 V
CH1 P-P = 74.4 V
CH1 20V A 10
µ
s 150 V VERT
CH1 FREQ = 15.6 KHz
CH1 P-P = 72.8 V
CH1 P-P = 72.8 V
CH1 FREQ = 15.6 KHz
CH1 P-P = 70.4 V
CH1 P-P = 70.4 V
CH1 20V A 10
µ
s 150 V VERT
gnd
gnd
gnd
gnd
gnd
gnd
gnd
gnd
gnd
gnd
gnd
gnd
gnd
gnd
gnd
14
37GQ-20H
2
2
5
3
3
FOCUS
1
1
L3
4
4
+10
V
JF13
JF15
QPWBF7287BMN0
-
+20V
+8V
+10V
+105
V
S1001
K0079GE
S1002
K0079GE
C702
10nF
(250V)
KZ0029
C703
10nF
(250V)
KZ0029
C704
10nF
(250V)
KZ0029
D701
DX0571
D702
DX0571
D703
DX0571
D704
DX0571
D705
R702
470K
(1/2W)
D707
DX0505
D708
DX0561
D709
DX0590BM
MBR1100RL
D710
DX0504
T701
Z0580BM
8
3
16
15
11
13
12
D
8
D
9
D
10
D
11
12
12
VCC
13
GND
14
L701
CILF0160BM
(G)
N0207CE
PR701
P0028
C507
220nF
R524 3K9
D717
1N4937
R715 10
D716 DX0551BM
R880
470
C862
470pF
(L2)
QTIPM0017CEFM
R888
0
Q870
TX0181
BF422
9
F701
T3.15
R879
470
Q872
TX0181
BF422
(H)
N0461CE
5
C874
1nF
(500V)
12
R894
1K
R885
2K7
(1/2W)
R883
2K7
(1/2W)
L861
12uH
C860
470pF
R866 15K
(2W)
R862
15K
(2W)
7
R899
0
8
R887
2K7
(1/2W)
Q885
TX0180BM
C701
470nF
(275V)
FZ0160BM
C871
470pF
6
R892
1K
C876
4.7nF
(2KV)
R864
15K
(2W)
D811
DX0045
D862
DX0045
(A)
N0304CE
R893
1K
R881
470
C861
470pF
D861
DX0045
4
Q883
TX0180BM
C872
470pF
(L3)
QTIPM0017CEFM
R898
0
S701
P0588
C873
470pF
Q871
TX0181
BF422
3
D860
DX0045
Q887
TX0180BM
(K
)
N0561
D812
DX0045
C878
10uF
(200V)
C715
100nF
Q702
TX0218
BC337-40
R710
220
(1/2W)
JF11
C707
10uF
(16V)
C710
220uF
(25V)
C705
47uF
(400V)
EZ0140BM
C879
100pF
Q705
2SA1037
R716
47K
(1/2W)
C718
47nF
400V
R701
470K
(1/2W)
FB701
R724
150
R725
390
R502
C723
100pF
R703
22
FB702
BLN-0037CE
CRT
7
5
4
9
3
6
8
1
D722
DX0504
D723
DX0503
D721
DX0504
C711
100uF
(160V)
R718
4K7
C713
220uF
C712
220uF
(16V)
C728
220pF
(2Kv)
1
2
13
15
14
SCHEMA
TIC DIAGRAM.
Page 16
Page 15
1
I
H
G
F
E
D
C
B
A
2
3
4
5
6
7
15
37GQ-20H
H.V.
FOCO
G2
1
2
3
4
1
+8V
+8V
+5V B
-10V
SER
J77
+7V
-10V
+5V A
-25V
+10V
PC3
+105
V
+105
V
.
.
C708
15nF
C709
2n2
(4Kv)
C603
220uF
(10V)
C604
220uF
(10V)
D705
DX0551
D706
C6V2
EX0584
R704
100
R705
330
(TQ)
R707
8M2
(1/2W)
(UA)
R708
8M2
(1/2W)
(UA)
D711
DX0503
1N4933
D710
DX0504
1N4934
D714
B5V6
Q701 2SC2412
Q703
TX0218
BC337-40
R512
10K
R513
68K
Q501
BC636
R604
470
(1/2W)
R606
6.8
(1/2W)
R607
1
(1/2W)
R610
27
(1/2W)
R611
27
(1/2W)
R612
2.7
(1W)
R615
10
(1/2W)
R616
3K3
(1/2W)
C608
1uF
(160V)
C609
470nF
(250V)
FZ0174BM
Q601
TX0132
BU508D
Q604
2SC2412
L601
4.7uF
(CF)
L602
22uH
(CF)
D601
DX0551
D602
DX0505
1N4935
D604
DX0506
1N4936
D6
DX
1N
R614
560
11
7
10
3
8
5
6
14
13
9
10
IC701
TDA16833
GND
1
FB
2
3
3
D
4
D
5
D
6
D
7
D
8
D
9
D
10
D
11
12
12
VCC
13
GND
14
(H)
N0461CE
(F)
N0505CE
R714
820
(1/2W)
R517
180K
C503
330nF
Q505
2SA1037
R525
120
+VS
-VS
_
+
IC501
UA741
8
7
6
5
4
3
2
1
220nF
R519
8K2
R617 1K
Q502
BC635
D503
1N4933
C717
10uF
(16V)
R603
330
(1/2W)
R609
2.2
(1/2W)
Q603
TX0112
BC636
R605
6.8
(1/2W)
Q602
BC635
TX0108BM
R523
560
R536
4K7
R516
1K
D605
DX0504
1N4934
R613
15K
C606
22nF
R706
680
R710
220
(1/2W)
C607
100uF
(35V)
FB701
BLN-0020
C722
10uF
(16V)
R722
120
C610
22nF
D607
EX0549BM
7V5
R510
1
(1/2W)
R533
120K
Q509
2SA1037
R535
820K
Q707
TX0217
BC337
D718
5V6
R721
22
R720
560
(1/2W)
R719
2K7
Q706
2SA1037
Q708
2SC2412KQ
R502
1K
R530
180K
C510
100pF
C724
100pF
C723
100pF
R509
1K
R703
22
R537
15K
C726
2.2uF
R1027
100
J67
1uF
Q507
2SC2412KQ
D723
DX0503
T601
NF2072BM
4
2
5
6
9
D712
6V2
(2%)
C601
6n8
1K5
R711
22
R723
1K
R718
4K7
C713
220uF
(16V)
C714
470uF
(10V)
220uF
(16V)
Q506
2SA1037
R534
1K5
D603
DX0045
C605
100nF
R608
18K
R538
2K2
C725
2n2
(4Kv)
3
4
7
8
Page 17
Page 14
8
9
10
11
12
13
14
I
H
G
F
E
D
C
B
A
16
37GQ-20H
RMC001
1
2
3
4
5
+20V
JF16
AUDIO
VT
BH
BU
VERT
B
G
G
B
G
B
G
B
+20V
B
G
VERT
I
I
-25V
+105
V
+5V B
R
R
R
R
R
BL
+105
V
VSYNC
VSYNC
SDA
AGC
FB
VSYNC
SS
FLB
SCL
FLB
L/L'
FB
PC5
.
3
2
CU0222CE
1
S1002
K0079GE
S1003
K0079GE
S1004
K0079GE
C805
1uF
C806
100nF
C807
100nF
C808
100nF
C809
100nF
C810
100nF
C811
100nF
C901
100nF
R801
220
R802
220
R803
220
R804
1K
R809
47K
R810
100
R811
100
R812
100
R822
330K
C819
1uF
R301
4K7
(1/2W)
R304
2.2
(1/2W)
R305
4K7
(1/2W)
R306
100K
R307
10K
R310
100
R311
100K
R313
560
R314
1K
C302
1uF
C304
100uF
(16V)
C307
47uF
(16V)
Q301
BC337
TX0217
Q302
BC327
TX0216
Q303
2SA1037
Q304
2SC2412
L301
3.3uH
(DF)
C820
L1001
10uH
(DF)
R1009
1K
R1010
33K
R1011
4K7
(1/2W)
R1012
4K7
(1/2W)
R1013
4K7
(1/2W)
R1014
22K
C1002
22pF
C1003
22pF
C1006
22pF
R1016
330
R1017
270
D1001
PX0104BM
C309
10nF
C308
1uF
R1015
22K
(K)
N0561
C1005
15pF
R302
4K7
(1/2W)
R823
1K
R1022
4K7
R1020 5K6
C1011
22nF
R808
1K
(S)
FB301
BLN0037
IC1004
PST529
2
2
1
1
3
3
R303
33K
C1008
47nF
Q305
2SC2412
R221
R222
220K
D805
5V6
28
BS
29
BEXT
30
GEXT
31
REXT
32
53
BTUN
52
HALFCTR
51
FBOSD
50
ROSD
49
FB
33
Y/C
34
CHR
35
APR
36
UIN
37
VIN
38
YIN
39
YOUT
40
VOUT
41
UOUT
42
BOUT
43
GOUT
44
ROUT
45
ISENS
46
BOSD
47
GOSD
48
D806
5V6
R321
1K
R318
15K
D301
DX0045BM
R312
10K
C303
1uF
(160V)
C312
220uF
(10V)
C315
100pF
Q503
TX0108BM
BC635
R824
75
R825
75
R826
75
D804
5V6
Q1003
2SA1037KQ
C1015
330nF
R1034
150K
R1033
4K7
C1014
10uF
(16V)
C1010
100nF
R1023
4K7
R806
1K
R1018
10K
R1004
100
L1002
68uH
R315
10K
R1005
100
C1004
15pF
R1025
4K7
R1007
100
R1026
0
R1006
100
R1024
4K7
R807
1K
R1021
4K7
R1008
3K3
X1001
8MHz
R1001
100
C1001
470uF
(6.3V)
R1002
100
R805
1K
D1002
5V6
R1019
1K
R1003
100
Q1002
2SC2412
D807
5V6
Q1001
PH2369
IC1003
IX10037
C1007
22nF
C222
C1012
100nF
C1009
47uF
(10V)
IC100
1
ST63
8
7
DA4
44
DA3
43
DA2
42
DA1
41
DA0
40
VDD
39
SCL
38
SDA
37
PC2
36
PC3
35
PC4
34
DA5
1
PB1
2
PB2
3
PB3
4
PB4
5
PB5
6
PB6
7
PA0
8
PA1
9
PA2
10
PA3
11
12
12
PA4
13
PA5
14
PA6
15
PA7
16
VSS
17
R
18
G
19
B
20
BLANK
21
HSYNC
22
PC5
33
PC6
32
PC7
31
VS
30
RESET
29
XTAL
28
XTAL
27
26
26
OSD
25
OSD
24
VSYNC
23
R1032
39K
J19
3K3
6
11
10
Page 14
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7
R
Q
P
O
N
M
L
K
J
Page 17
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