Sharp 21AG1-M Service manual
20A1/2, 20AG1/2
21A1/2, 21AG1/2
CHASSIS LAYOUT
Ë
MODEL
H
G
F
20A1-S, 21AG1-M/S,
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21A1-S, 21AG1-M/S
E
D
C
B
A
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20A1/2, 20AG1/2
21A1/2, 21AG1/2
CHASSIS LAYOUT
Ë
MODEL
H
G
F
==20A1-A/W, 21A1-A
!"#$%
E
D
C
B
A
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38
20A1/2, 20AG1/2
21A1/2, 21AG1/2
CHASSIS LAYOUT
Ë
MODEL
H
G
F
20A2-S, 20AG2-M/S(G)/S(Y),
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21A2-S, 21AG2-M/S(G)/S(Y)
E
D
C
B
A
654321
39
BLOCK DIAGRAM-1
!"JN
H
G
F
20A1/2, 20AG1/2
21A1/2, 21AG1/2
E
D
C
B
A
121110987654321
40
41
20A1/2, 20AG1/2
21A1/2, 21AG1/2
BLOCK DIAGRAM-2
!"JO
H
G
F
J351
E
D
Q3302
Q3301
C
Q3300
B
A
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42
20A1/2, 20AG1/2
21A1/2, 21AG1/2
WAVEFORMS
H
G
0.98 Vp-p 20"
1
1.12 Vp-p 21"
F
E
80.0 Vp-p (H)
6
D
3.15 Vp-p (H) 20"
2
3.17 Vp-p (H) 21"
89.4 Vp-p (H) 20"
7
87.2 Vp-p (H) 21"
3.02 Vp-p (H) 20"
3
3.11 Vp-p (H) 21"
3.10 Vp-p (H) 20"
8
3.11 Vp-p (H) 21"
3.28 Vp-p (H) 20"
4
3.11 Vp-p (H) 21"
1.85 Vp-p (H) 20"
9
1.93 Vp-p (H) 21"
81.8 Vp-p (H) 20"
5
83.8 Vp-p (H) 21"
129.0 Vp-p (H) 20"
0
133.0 Vp-p (H) 21"
C
B
A
8.48 Vp-p (H) 21"
952 Vp-p (H) 20"
y
980 Vp-p (H) 21"
8.38 Vp-p (H) 20"
q
1.08 Vp-p (H) 20"
w
1.17 Vp-p (H) 21"
2.7 Vp-p (H) 20"
u
2.6 Vp-p (H) 21"
0.83 Vp-p (H) 20"
e
0.91 Vp-p (H) 21"
504 Vp-p (H) 20"
i
510 Vp-p (H) 21"
46.6 Vp-p (H) 20"
r
48.0 Vp-p (H) 21"
130.0 Vp-p (H) 20"
t
130.5 Vp-p (H) 21"
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20A1/2, 20AG1/2
21A1/2, 21AG1/2
DESCRIPTION OF SCHEMATIC DIAGRAM
SAFETY NOTES:
H
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.
IMPORTANT SAFETY NOTICE:
PARTS MARKED WITH “å” ( ) ARE IMPORTANT FOR
MAINTAINING THE SAFETY OF THE SET. BE SURE TO RE-
G
PLACE THESE PARTS WITH SPECIFIED ONES FOR MAINTAINING THE SAFETY AND PERFORMANCE OF THE SET.
SERVICE PRECAUTION:
THE AREA ENCLOSED BY THIS LINE (
CONNECTED WITH AC MAINS VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN ISOLATING TRANSFORMER BETWEEN TV RECEIVER AND AC LINE TO ELIMINATE
F
HAZARD OF ELECTRIC SHOCK.
E
) IS DIRECTLY
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NOTES:
1. The unit of resistance “ohm” is omitted.
(K = 1000 ohms, M = Meg ohm).
2. All resistors are 1/16 watt, unless otherwise noted.
3. All capacitors are
µ
F, unless therwise noted. (P = µµF).
VOLTAGE MEASUREMENT CONDITIONS:
1. Voltage in parenthesis measured with no Signal.
2. Voltages without parenthesis measured with PAL Colour-Signal.
3. All the voltages in each point are measured with high impedence
volt-meter.
WAVEFORM MEASUREMENT CONDITIONS:
1. Colour bar generator signal of 1.8V peak to peak applied at Base
of Video Buffer Amp. Q200.
2. Approximately 4.0 V AGC bias.
!"#$
NK !"#$%&'()*+,-./0
OK !"#$%&'()*+,-./01234$56789
D
!"#$%&
åE==============F= !"#$%&'()*+,-.
!"#$%&'()*+%&,-./0123+45678
!"#$
!"
C
=E================F= !"#$%&'()*+,%-./012
!"#$%&'()*+,-."/0)1234567)8
!"#$%&'
B
!"#$
NK !"#$%&'()*"hZ !jZ !"
OK !"#$%&'()*+,-NLNS
PK !"#$mZ !"#$%&'()*+µc
!"#
NK !"#$%&'()*+,-
OK !"#$%m^i !"#$%&'
PK !"#$%&#'$()$%*sqsj
!"#$
NK NKUséJé !"#$%&'()*+,#nOMM !
OK !"#$%&'QKMs
A
654321
44
20A1/2, 20AG1/2
21A1/2, 21AG1/2
Ë
Infrared Remote Control Unit
RRMCG1342PESA
!"#
H
G
F
NOTE : The parts here shown are supplied as an assembly but not independently.
W !"#$%&'()*+,-./&01(."#$2
E
D
C
B
A
654321
45
20A1/2, 20AG1/2
21A1/2, 21AG1/2
Ë
Tuner
NOTE : The parts here shown are supplied as an assembly but not independently.
H
G
F
W !"#$%&'()*+,-./&01(."#$2
===
(20A1/2, 20AG1/2)
å
VTUATEDE9-023
E
D
C
B
A
654321
46
20A1/2, 20AG1/2
21A1/2, 21AG1/2
Ë
Tuner
NOTE : The parts here shown are supplied as an assembly but not independently.
H
G
F
W !"#$%&'()*+,-./&01(."#$2
===
(21A1/2, 21AG1/2)
å
VTUVTST5HD84/
E
D
C
B
A
654321
47
MODELS 20A1, 20AG1 SCHEMATIC DIAGRAM: MAIN Unit
OM^NI=OM^dN= !"#$%&
H
RDA300
R0142PEFW
G
F
D1007-10
EX0867CE
20A1/2, 20AG1/2
21A1/2, 21AG1/2
EX0903 CE
EX0903CE
PIC
EX0840 CE
E
D
C
B
A
121110987654321
48
49
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