PDP-4271HD
81
5
6
7
8
5
6
7
8
C
D
F
A
B
E
No
Is the waveform normal when the
voltage is applied to the panel?
(See the oscilloscope photos.)
Are all the connectors properly
connected?
Reconnect the connectors.
No
Set the VH voltage correctly.
X DRIVE Assy
Y DRIVE Assy / SCAN A, B Assy
ADDRESS Assy
Abnormality across the whole
screen, such as luminescent spots
B
D
C
NG
Yes
No
Set the VOFS voltage correctly.
NG
Is the VH set voltage (130 V)
correctly set?
Yes
Is the VOFS set voltage correctly
set (set value: designated for
each panel)?
No
No
Another Assy may be in failure.
Set the VYRST voltage correctly.
No
Replace the FFC cables.
Replace the DIGITAL Assy.
Replace the Y DRIVE Assy.
Replace the SCAN IC.
NG
NG
NG
Yes
Yes
Yes
Yes
Yes
Is the VYRST set voltage correctly
set (set value: designated for
each panel)?
Is the input signal normal?
(See the oscilloscope photos.)
No
Is the waveform of the control
signal from the SCAN Assy
normal?
(See the oscilloscope photos.)
Failure analysis for the
drive system
⇒
DR2
Because it is difficult to identify which drive is in failure, follow the flowchart below to check each Assy.
Flowchart of Failure Analysis for The Drive Assy
Содержание PDP-4270HD
Страница 20: ...PDP 4271HD 20 1 2 3 4 1 2 3 4 C D F A B E 2 6 PANEL CHASSIS SECTION 1 2 3 6 4 5 8 8 8 8 8 8 9 13 7 10 12 11 14 ...
Страница 55: ...PDP 4271HD 55 5 6 7 8 5 6 7 8 C D F A B E ...
Страница 189: ...PDP 4271HD 189 5 6 7 8 5 6 7 8 C D F A B E Block Diagram R2S11002AFT MAIN ASSY IC4701 AV SW ...
Страница 190: ...PDP 4271HD 190 1 2 3 4 1 2 3 4 C D F A B E Block Diagram R2S11001FT MAIN ASSY IC4901 Component SW IC ...