Pioneer PDP-5016HD Service Manual page 126

1
QQ
3 7 63 1515 0
A
Failure analysis for the
drive system ⇒ DR2
Abnormality across the whole
screen, such as luminescent spots
B
C
TE
L 13942296513
D
Another Assy may be in failure.
D
E
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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 Assy
Are all the connectors properly
connected?
Yes
Is the VH set voltage (130 V)
correctly set?
Yes
Is the VOFS 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 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.
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y
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8
X DRIVE Assy
B
No
No
No
Q Q
3 6 7 1 3
No
Yes
Is the waveform normal when the
voltage is applied to the panel?
(See the oscilloscope photos.)
No
No
No
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3
4
2 9 9 4 2 8
ADDRESS Assy
C
Reconnect the connectors.
NG
Set the VH voltage correctly.
NG
Set the VOFS voltage correctly.
NG
1 5 0 5 8 2 9 9 4
Set the VYRST voltage correctly.
NG
Replace the FFC cables.
NG
Replace the DIGITAL Assy.
Replace the Y DRIVE Assy.
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co
4
9 9
2 8 9 9