PDP-4280HD
49
5
6
7
8
5
6
7
8
C
D
F
A
B
E
No
Y DRIVE Assy
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 VSNOFS voltage correctly.
NG
Is the VH set voltage (130 V)
correctly set?
Yes
Is the VSNOFS 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
Yes
Yes
Yes
Yes
No
Set the VKNOFS1, 2 voltage correctly.
NG
Yes
Is the VKNOFS1, 2 set voltage
correctly set?
NG
Yes
No
Set the VKNOFS3 voltage correctly.
Is the VKNOFS3 set voltage correctly
set (set value: designated for each panel)?
NG
Yes
No
Set the VKNOFS 4voltage correctly.
Is the VKNOFS4 set voltage correctly
set (set value: designated for each panel)?
NG
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.
Summary of Contents for PDP-4280HD
Page 10: ...PDP 4280HD 10 1 2 3 4 1 2 3 4 C D F A B E 2 2 SPECIFICATIONS Dimensions ...
Page 11: ...PDP 4280HD 11 5 6 7 8 5 6 7 8 C D F A B E 2 3 PANEL FACILITIES Front Section ...
Page 12: ...PDP 4280HD 12 1 2 3 4 1 2 3 4 C D F A B E Rear Section ...
Page 13: ...PDP 4280HD 13 5 6 7 8 5 6 7 8 C D F A B E Remote Control Unit ...
Page 19: ...PDP 4280HD 19 5 6 7 8 5 6 7 8 C D F A B E ...
Page 20: ...PDP 4280HD 20 1 2 3 4 1 2 3 4 C D F A B E 4 BLOCK DIAGRAM 4 1 OVERALL WIRING DIAGRAM 1 2 ...
Page 22: ...PDP 4280HD 22 1 2 3 4 1 2 3 4 C D F A B E 4 2 OVERALL WIRING DIAGRAM 2 2 ...
Page 23: ...PDP 4280HD 23 5 6 7 8 5 6 7 8 C D F A B E ...
Page 35: ...PDP 4280HD 35 5 6 7 8 5 6 7 8 C D F A B E ...
Page 168: ...PDP 4280HD 168 1 2 3 4 1 2 3 4 C D F A B E 10 6 PANEL CHASSIS SECTION ...
Page 172: ...PDP 4280HD 172 1 2 3 4 1 2 3 4 C D F A B E 10 8 PDP SERVICE ASSY 428 Exterior Section ...