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21V-FS700S
TROUBLE SHOOTING FLOWCHART (Continued)
CIRCUITS TO BE CHECKED:
Sound Detector Circuit.
Sound Switch and Att.
Control.
Audio Output Circuit.
CIRCUIT TO BE CHECKED:
Sync. Separator Circuit.
NO SOUND
Does signal appear at pins
(2) and (4) of IC301 ?
Check Speaker.
NEITHER VERTICAL NOR
HORIZONTAL SYNCHRONIZATION
Check pins (20), (21), (47)
and (48) of IC1001.
DEFECTIVE VERTICAL AMP.
AND VERTICAL LINEARITY
Re-adjust vertical size.
(Bus Data)
Vertical linearity and size are
abnormal.
Check R503, R506 and
R521.
NO VERTICAL SCAN
Check IC501 bias.
Check C511 and C516.
Check TV sound from pin (25) &
pin (26) of IC1001.
Check IC301 and
peripheral circuit.
Check IC501.
5 – 2
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