BEKO GA-1 Schematic
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 OPERATING.
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 TRANSFORMER BETWEEN TV RECEIVER AND AC LINE TO ELIMINATE
HAZARD OF ELECTRIC SHOCK.
WAVEFORMS
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
µ
F, 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 ColourSignal.
3. All the voltages in each point are measured with VTVM.
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
1) 1.0 Vp-p (H) 3) 3.1 Vp-p (H) 4) 3.1Vp-p (H) 5) 78.4 Vp-p (H)2) 3.0 Vp-p (H)
6) 70.0 Vp-p (H) 8) 3.2 Vp-p (V) 9) 2.32 Vp-p (H) 10) 122.0 Vp-p (H)7) 79.2 Vp-p (H)
11) 8.8 Vp-p (H) 13) 110.0 Vp-p (H) 14) 1.1k Vp-p (H) 15) 480.0 Vp-p12) 50.0 Vp-p (V)
16) 28.0 Vp-p (V) 17) 2.08 Vp-p (V)
23
SCHEMATIC DIAGRAM:MAIN Unit
H
G
F
TDA 93xx
CHASSIS GA-1
E
D
C
B
A
87109654321
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