21V-FS700S
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.
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