JVC JX-S555 Service Manual page 16

JX-S555(J)
Symptom
14. Malfunction in
Y/C mixing of
CH1 to CH4
inputs.
15. Malfunction in
Y/C mixing of
CH5 input.
16. Component
video signal is
not output.
17. Audio signals
are not output.
18. Audio signals
are not output
at the Monitor.
16 (No. 70251)
M Check Points
Q107: Emitter
(Monitor output: Q115 emitter)
N
Q122: Emitter
O
(Y) Q401: Emitter
(Pb) Q402: Emitter
(Pr) Q403: Emitter
P
(L) IC806: Pins 6 & 7
(R) IC806: Pins 1 & 2
Q
(L) IC801 to IC805: Pins 7
(R) IC801 to IC805: Pins 1
R
(L) IC807 pins 6 & 7
(R) IC807 pins 1 & 2
Normal Voltage/Waveform
2.0 Vp-p
2.0 Vp-p
(Y)
1.0 Vp-p
(Cb)
0.7 Vp-p
(Cr)
0.7 Vp-p
–
10 dBV
(0.32 Vrms)
–
10 dBV
(0.32 Vrms)
–
10 dBV
(0.32 Vrms)
Check Results and Failures
NO Check IC101 and surroundings.
YES Check IC103 and their surroundings.
NO Check Q105, Q106, Q121,
Q122 and their surroundings.
YES Check IC103 and their surroundings.
NO Check IC401, IC402 and their
surroundings.
YES Check 6 dB amp (Q404 to Q409,
Q413 to Q415), output buffer and
their surroundings.
Q
NO Go to check .
YES Check IC808, IC809 and their
surroundings.
NO Check IC801 to IC805 and
their surroundings.
YES Check IC101 and surroundings.
NO Check IC807 and surroundings.
YES Check CN806 and wire.