21F-PD250 / 21F-PT220 / 21F-PA18 / 21F-PA18(B)
9 – 1
TV21Q-FG1FService Manual21Q-FG1FMarketE
CHAPTER 9. DESCRIPTION OF SCHEMATIC DIAGRAM
[1] DESCRIPTION OF SCHEMATIC DIAGRAM
SAFETY NOTES:
DISCONNECT THE AC PLUG FROM THE AC OUT-
LET BEFORE REPLACING PARTS.
SEMICONDUCTOR HEAT SINKS SHOULD BE RE-
GARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.
1.
2.
NOTES:
The unit of resistance "ohm" is omitted.
(K = 1000 ohms, M = Mega ohm).
1.
All resistors are 1/16 watt, unless otherwise noted.2.
All capacitors are µF, unless otherwise noted.
(P = µµF).
3.
VOLTAGE MEASUREMENT CONDITIONS:
Voltages in parenthesis measured with no signal.1.
Voltages without parenthesis measured with 3mV B & W
or Colour signal.
2.
All the voltages in each point are measured with VTVM.3.
WAVEFORM MEASUREMENT CONDITIONS:
The colour bar generator signal of 1.0V peak applied at
pin (41) of IC801.
1.
Approximately 4V AGC bias.2.
SERVICE PRECAUTION:
THE AREA ENCLOSED BY THIS LINE ( - ) IS DI-
RECTLY CONNECTED WITH AC MAINS VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN ISOLAT-
ING TRANSFORMER BETWEEN TV RECEIVER AND
AC LINE TO ELIMINATE HAZARD OF ELECTRIC
SHOCK.
CAUTION:
This circuit diagram is a standard one, prited circuits may
be subject to change for product improvement without pri-
or notice.
IMPORTANT SAFETY NOTICE:
PARTS MARKED WITH " " ( ) ARE IMPO-
TANT FOR MAINTAINING THE SAFETY OF THE SET.
BE SURE TO REPLACE THESE PARTS WITH SPECI-
FIED ONES FOR MAINTAINING THE SAFETY AND
PERFORMANCE OF THE SET.
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