Pioneer PDP-5010FD Service Manual page 49

5
Failure analysis for the
drive system => DR2
Abnormality across the whole
screen, such as luminescent spots
Another Assy may be in failure.
D
5
6
Because it is difficult to identify which drive is in failure, follow the flowchart below to check each Assy.
Y DRIVE Assy / SCAN A, B, C, D
Assys
Y DRIVE Assy
Are all the connectors properly
connected?
Yes
Is the VH set voltage (130 V)
correctly set?
Yes
Is the VSNOFS set voltage correctly
set (set value: designated for each panel)?
Yes
Is the VYRST set voltage correctly
set (set value: designated for each panel)?
Yes
Is the VKNOFS1, 2 set voltage
correctly set?
Yes
Is the VKNOFS3 set voltage correctly
set (set value: designated for each panel)?
Yes
Is the VKNOFS4 set voltage correctly
set (set value: designated for each panel)?
Yes
Yes
Is the waveform normal when the
voltage is applied to the panel?
(See the oscilloscope photos.)
Is the input signal normal?
(See the oscilloscope photos.)
Yes
Is the waveform of the control
signal from the SCAN Assy normal?
(See the oscilloscope photos.)
Yes
Replace the SCAN IC.
6
7
X DRIVE Assy
B
No
No
No
No
No
No
No
No
No
No
PDP-5010FD
7
8
ADDRESS Assy
C
Reconnect the connectors.
NG
Set the VH voltage correctly.
NG
Set the VSNOFS voltage correctly.
NG
Set the VYRST voltage correctly.
NG
Set the VKNOFS1, 2 voltage correctly.
NG
Set the VKNOFS3 voltage correctly.
NG
Set the VKNOFS 4voltage correctly.
NG
Replace the FFC cables.
NG
Replace the DIGITAL Assy.
Replace the Y DRIVE Assy.
8
A
B
C
D
E
F
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