20CT-250
20CT-250
12
11
10
9
8
7
6
5
4
3
2
1
A
B
C
D
E
F
G
H
19
20
DESCRIPTION OF SCHEMATIC DIAGRAM
SAFETY NOTES:
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 OPER-
ATING.
IMPORTANT SAFETY NOTICE:
PARTS MARKED WITH "
å
" ( ) ARE IMPORTANT FOR
MAINTAINING THE SAFETY OF THE SET. BE SURE TO REPLACE
THESE PARTS WITH SPECIFIED ONES FOR MAINTAINING THE
SAFETY AND PERFORMANCE OF THE SET.
SERVICE PRECAUTION:
THE AREA ENCLOSED BY THIS LINE ( ) IS DIRECTLY
CONNECTED WITH AC MAINS VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN ISOLATING TRANS-
FORMER BETWEEN TV RECEIVER AND AC LINE TO ELIMINATE
HAZARD OF ELECTRIC SHOCK.
NOTES:
1. The unit of resistance "ohm" is omitted.
(K = 1000 ohms, M = Meg ohm).
2. All resistors are 1/8 watt, unless otherwise noted.
3. All capacitors are
µ
F, unless otherwise noted. (P =
µµ
F).
4. All capacitors are 50V, unless otherwise noted.
VOLTAGE MEASUREMENT CONDITIONS:
1. Voltage in parenthesis measured with no Signal.
2. Voltages without parenthesis measured with 3mV B & W or
Colour-Signal.
3. All the voltages in each point are measured with VTVM.
WAVEFORM MEASUREMENT CONDITIONS:
1. Colour bar generator signal of 1.5V peak to peak applied at
Base of Video Buffer Amp. Q202.
2. Approximately 4.0 V AGC bias.
1
2.0 Vp-p (H)
2
1.3 Vp-p (H)
3
1.5 Vp-p (H)
4
3.0 Vp-p (H)
5
3.0 Vp-p (H)
6
3.0 Vp-p (H)
7
80 Vp-p (H)
8
80 Vp-p (H)
9
80 Vp-p (H)
10
5.7 Vp-p (H)
11
1.8 Vp-p (V)
12
0.8 Vp-p (H)
13
9.2 Vp-p (H)
14
1.8 Vp-p (V)
15
55 Vp-p (V)
16
145 Vp-p (H)
17
1000 Vp-p (H)
18
150 Vp-p (H)
19
520 Vp-p (H)
WAVEFORMS
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Ë
Tuner
NOTE: The parts here shown are supplied as an assembly but not independently.
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RTUNQ0004KJZZ
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Infrared Remote Control Unit
NOTE: The parts here shown are supplied as an assembly but not independently.
RRMCG0018PESA
6
5
4
3
2
1
A
B
C
D
E
F
G
H
