21S-FX10F/10S/10N/10U
5 – 2
TROUBLE SHOOTING FLOWCHART (Continued)
Does signal appear at pins
(2) and (4) of IC301 ?
NO SOUND
CIRCUITS TO BE CHECKED:
Sound Detector Circuit.
Sound Switch and Att.
Control.
Audio Output Circuit.
Check TV sound from pin (25) &
pin (26) of IC1001.
NEITHER VERTICAL NOR
HORIZONTAL SYNCHRONIZATION
CIRCUIT TO BE CHECKED:
Sync. Separator Circuit.
Check pins (20), (21), (47)
and (48) of IC1001.
Vertical linearity and size are
abnormal.
DEFECTIVE VERTICAL AMP.
AND VERTICAL LINEARITY
Re-adjust vertical size.
(Bus Data)
Check R503, R506 and
R521.
NO VERTICAL SCAN
Check IC501.Check C511 and C516.
Check IC501 bias.
Check Speaker.
Check IC301 and
peripheral circuit.
Does signal appear at pins
(11) and (12) of IC3801 ?
YES (Signal)
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