JVC JX-S555 Service Manual page 14

JX-S555(J)
Symptom
8. The S-Video
inputs at CH1 to
CH4 are not
displayed.
9. The S-Video
inputs at CH1 to
CH4 are not
output at the
Monitor output.
10. The S-Video
input at CH5 is
not displayed.
14 (No. 70251)
Check Points
+
(Y) Q131: Emitter
(C) Q133: Emitter
,
(Y) Q108: Emitter
(C) Q109: Emitter
-
(Y) Q137: Emitter
(C) Q139: Emitter
.
(Y) Q110: Emitter
(C) Q111: Emitter
/
(Y) Q104: Emitter
(C) Q102: Emitter
Normal Voltage/Waveform
(Y)
2.0 Vp-p
(C)
1.28 Vp-p
(Y)
2.0 Vp-p
(C)
1.28 Vp-p
(Y)
2.0 Vp-p
(C)
1.28 Vp-p
(Y)
2.0 Vp-p
(C)
1.28 Vp-p
(Y)
2.0 Vp-p
(C)
1.28 Vp-p
Check Results and Failures
,
NO Go to check .
YES Check IC107, IC108, output buffer
and their surroundings.
NO Check IC101 and surroundings.
YES Check IC102, IC104 and their
surroundings.
.
NO Go to check .
YES Check output buffer and
surroundings.
NO Check IC101 and surroundings.
YES Check IC102, IC104 and their
surroundings.
NO Check Q101 to Q104, Q119, Q120
+
and their surroundings.
YES Go to check .