NEC PlasmaSync 50MP1 User Manual page 71

1
No pictures available only in the NTSC mode (ternary Y/C separation defective)
Is a composite signal available
at Pin 88 of IC5313?
(See Fig. 8.)
YES
Are the Y/C signals available
at TP5310/TP5311? (Similar
waveforms in Figs. 9 and 10)
NO
Does oscillation take place at
Pins 30 and 31 of IC5313?
(See Fig. 11.)
YES
Is power fed to IC5313?
YES
IC5313 and peripheral circuits
are out of order.
Fig. 8
Signal VIDEO at Pin 8 of IC5313
Fig. 11
Oscillation waveform at Pin 30 of IC5313
20MHz sine wave
NO
Failure in Q5302 to Q5305.
YES
Are the Y/C signals available
at TP5309/TP5308?
(See Figs. 9 and 10.)
Q5320 to Q5327 and peripheral
circuits are out of order.
YES
Is power fed to IC5312?
IC5316 and peripheral circuits
are out of order.
NO
IC5316 and peripheral circuits
are out of order.
Fig. 9
Signal Y at TP5308
1Vpp
64us
2.3Vpp
YES
NO
YES
NO
0.9Vpp
16ms
7
Failure in IC5306 to IC5309.
IC5313 or IC5312 is out of
order.
Conditions:
1. During the reception of
VIDEO NTSC C-BAR
2. Mode VIDEO
Fig. 10
Signal C at TP5309
Burst section ; 300mVpp