21J-FG1RU
5 – 2
TROUBLE SHOOTING FLOWCHART (Continued)
Does signal appear at pins
(10) and (23) of IC3501 ?
NO SOUND
CIRCUITS TO BE CHECKED:
»
Sound Detector Circuit.
»
Sound Switch and Att.
Control.
»
Audio Output Circuit.
Does signal appear at pins
(6) and (8) of IC301 ?
Check TV sound from pin (54)
of IC801.
Check Speaker.
Check IC301 and
peripheral circuit.
NEITHER VERTICAL NOR
HORIZONTAL SYNCHRONIZATION
CIRCUIT TO BE CHECKED:
»
Sync. Separator Circuit.
Check pins(5), (6), (10) and
(11) of IC801.
Vertical linearity and size are
abnormal.
DEFECTIVE VERTICAL AMP.
AND VERTICAL LINEARITY
Re-adjust vertical size.
(Bus Data)
Check R503, R506, R513,
R520 and C515.
NO VERTICAL SCAN
Check IC501.
Check C511.
Check IC501 bias.
Summary of Contents for 21J-FG1RU
Page 52: ...21J FG1RU 8 2 3 BLOCK DIAGRAM MAIN UNIT A C B D E F G H 1 2 3 4 5 6 7 8 9 10 ...
Page 53: ...21J FG1RU 8 3 10 11 12 13 14 15 16 17 18 19 ...
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Page 61: ...21J FG1RU 12 3 10 11 12 13 14 15 16 17 18 19 ...
Page 62: ...21J FG1RU 12 4 2 MAIN UNIT Chip Parts Side A C B D E F G H 1 2 3 4 5 6 7 8 9 10 ...
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