Pioneer PDP-507CMX Service Manual page 99

5
Failure analysis for the
drive system ⇒
DR3
The abnormality is associated with
one address or one TCP?
Is the TCP control signal normal?
(See the oscilloscope photos.)
Yes
Replace the panel chassis.
In most cases of damage on one line,
the panel chassis must be replaced.
Failure analysis for the
drive system ⇒
DR4
The abnormality is associated
with a single scan line.
Is the waveform normal when the
voltage is applied to the panel?
Yes
Is the cable connected properly
to the 90-pin connecter ?
Yes
Replace the SCAN Assy
5
6
Diagnose the ADDRESS Assy.
No
Are the FFC cables properly
connected?
Yes
NG
Replace the DIGITAL Assy.
Diagnose the SCAN A and B Assys.
No
Is the cable connected properly
to the 15-pin connector?
Yes
Is the waveform of the SCAN IC
control signal from the Y DRIVE
Assy normal?
Yes
No
Connect the cable properly.
NG
6
7
No
Properly connect the FFC cables.
NG
If the FFC cable that connects the DIGITAL and ADDRESS Assys is in failure,
the abnormality is associated with one address in most cases.
No
Connect the cable properly.
NG
No
Replace the Y DRIVE Assy.
Care must be taken that no dirt or dust is attached or gets in.
(the SCAN IC may be damaged.)
PDP-507CMX
7
8
A
B
C
D
E
F
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