Sony PCS-1500 Service Manual page 185

V-2
Video encoder
color bar is OK?
YES
The GOA test pattern
is OK?
YES
V-3
m
. When entirely no pictures are outputted from the video system block, the +10 V power supply may be
defective.
IC904 and its peripheral supply the +10 V power. Confirm that the +10 V power is supplied to the
devices following the circuit diagram.
. The iicwrite and iicread commands can be used when the diagnostics of the video block ends in fail and
is stopped, or when ends with ALL TEST PASS.
PCS-1500/1500P
(*1) The waveform pictures of the Video Encoder (IC402)
up to the output terminal under this condition,
are shown at the end of this section.
NO
Either AUX or
MONITOR is outputted
at least?
NO
2
I C control is
effective for the video
(*1)
decoder?
YES
IC402 and its peripheral
NO
IC353, X350, IC402 or
their peripheral
YES
MONITOR is not output
→IC403, Q400, Q401, Q402, Q403 or
their peripheral
AUX is not outputted
→IC404, Q404, Q405 or their peripheral
NO
IC352, X350, IC402 or
their peripheral
(*2) Enter the following commands and
confirm that the same data is
returned.
#diag[|]iicwrite[|]88[|]1D[|]00↓
#diag[|]iicread[|]88[|]1D↓
IIC Data = 00
#diag[|]iicwrite[|]88[|]1D[|]FF↓
#diag[|]iicread[|]88[|]1D↓
IIC Data = FF
This test can be performed only when
the power of video block is turned on
and reset is released.
4-2. Self-diagnostics Function
4-55