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1
A
B
D
Another Assy may be in failure.
C
D
E
F
80
1
2
B
X DRIVE Assy
No
Are all the connectors properly
connected?
Yes
No
Is the VXNRST set voltage
(-180 V) correctly set?
Yes
Yes
No
Is the input signal normal?
(See the oscilloscope photos.)
Yes
Replace the X DRIVE Assy.
C
ADDRESS Assy
No
Are all the connectors properly
connected?
Yes
No
Is the TCP control signal normal?
(See the oscilloscope photos.)
Yes
PDP-427XD
2
3
Is the waveform normal when the
voltage is applied to the panel?
(See the oscilloscope photos.)
No
Replace the panel chassis.
3
4
Reconnect the connectors.
NG
Set the VXNRST voltage correctly.
NG
Replace the FFC cables.
NG
Replace the DIGITAL Assy.
Reconnect the connectors.
NG
Is the input signal normal?
(See the oscilloscope photos.)
Yes
No
Replace the FFC cables.
NG
Replace the DIGITAL Assy.
4
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