21F-PD250 / 21F-PT220 / 21F-PA18 / 21F-PA18(B)
5 – 2
TROUBLE SHOOTING FLOWCHART (Continued)
Does signal appear at pins
(8) of IC301 ?
NO SOUND
CIRCUITS TO BE CHECKED:
Sound Detector Circuit.
Sound Switch and Att.
Control.
Audio Output Circuit.
Check signal appear from pin (50)
of IC801 to pin (4) of IC301.
NEITHER VERTICAL NOR
HORIZONTAL SYNCHRONIZATION
CIRCUIT TO BE CHECKED:
Sync. Separator Circuit.
Check pins(9), (13) and (14)
of IC801.
Check Speaker.
Check IC301 and
peripheral circuit.
NO VERTICAL SCAN
Check IC501.Check C511.
Check IC501 bias.
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