BEKO chassis GA-1

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DESCRIPTION OF SCHEMATIC DIAGRAM
CHASSIS GA-1
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 OP-
ERATING.
NOTES:
1. The nit of resistance “ohm” is omitted.
(K = 1000 ohms, M = Meg ohm).
2. All resistors are 1/10 watt, unless otherwise noted.
3. All capacitors are µF, unless otherwise noted. (P = µµF).
VOLTAGE MEASUREMENT CONDITIONS:
1. Voltage in parenthesis measured with no Signal.
2. Voltages without parenthesis measured with 3mVB&W or Colour-
Signal.
3. All the voltages in each point are measured with VTVM.
IMPORTANT SAFETY NOTICE:
PARTS MARKED WITH “
å
” ( ) ARE IMPORTANT FOR
MAINTAINING THE SAFETY OF THE SET. BE SURE TO RE-
PLACE THESE PARTS WITH SPECIFIED ONES FOR MAINTAIN-
ING THE SAFETY AND PERFORMANCE OF THE SET.
WAVEFORM MEASUREMENT CONDITIONS:
1. Colour bar generator signal of 2.0V peak to peak applied at of
Base Video Buffer Amp Q251.
2. Approximately 4.0 V AGC bias
SERVICE PRECAUTION:
THE AREA ENCLOSED BY THIS LINE (
) IS DIRECTLY
CONNECTED WITH AC MAINS VOLTAGE.
WHEN SERVICING THEAREA, CONNECTAN ISOLATING TRANS-
FORMER BETWEEN TV RECEIVER AND AC LINE TO ELIMINATE
HAZARD OF ELECTRIC SHOCK.
WAVEFORMS
1) 1.0 Vp-p (H)
2) 3.0 Vp-p (H)
3) 3.1 Vp-p (H)
4) 3.1Vp-p (H)
5) 78.4 Vp-p (H)
6) 70.0 Vp-p (H)
7) 79.2 Vp-p (H)
8) 3.2 Vp-p (V)
9) 2.32 Vp-p (H)
10) 122.0 Vp-p (H)
11) 8.8 Vp-p (H)
12) 50.0 Vp-p (V)
13) 110.0 Vp-p (H)
14) 1.1k Vp-p (H)
15) 480.0 Vp-p
16) 28.0 Vp-p (V)
17) 2.08 Vp-p (V)
23
 SCHEMATIC DIAGRAM:MAIN Unit
CHASSIS GA-1
H
G
F
TDA 93xx
E
D
C
B
A
1
2
3
4
5
6
7
8
9
1 0
 10
11
12
13
14
15
16
17
18
19
 SCHEMATIC DIAGRAM:CRT and HEADPHONE Unit
Ë
CRT Unit
CHASSIS GA-1
H
G
F
E
D
Ë
HEADPHONE Unit
C
B
A
1
2
3
4
5
6
 SCHEMATIC DIAGRAM:MULTI Unit
CHASSIS GA-1
H
G
F
E
D
C
B
A
1
2
3
4
5
6
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