PDP-5050SX
145
5
6
7
8
5
6
7
8
C
D
F
A
B
E
Image for the component signal is not displayed
Image for the component
signal is not displayed
No
Is the function corresponding
to selected signal input
selected?
No Select the corresponding
signal with the Input selector.
Has the signal arrived at
IC8005?
Check the communication
between the jack and
IC8005.
Yes
Which signal is not output,
main or subsignal?
Yes
No
Is a signal output from
IC8005?
(43), (44), (46), (Pr, Pb, Y)
Check around IC8005 and
check the communications
between IC8005 and the
microcomputer.
Main signal
Is a signal output from
IC8005?
(35), (36), (38),(Pr, Pb, Y)
No
Subsignal
No
Yes
Check the communications
between IC8005 and
IC6601.
No
Is the communication
between each IC on the
MAIN BOARD Assy and
the microcomputer normal?
Check around the IC that is
found to have a failure in
communication and the
microcomputer.
Yes
No
Has the symptom been
settled when the MAIN
BOARD Assy is replaced?
The panel is defective.
Yes
No
Finishing troubleshooting
Yes
Yes
21
18
17
16
Has the signal arrived at
IC6401?
(7), (27), (3), (Y, Pb, Pr)
Check the communications
between IC8005 and
IC6401.
No
24
23
22
Yes
Has the signal arrived at
IC6402?
TP6402, 6403, 6404
Check the communications
between IC6401 and
IC6402.
No
30
29
28
Has the signal arrived at
IC6601?
(7), (27), (3), (Y, Pb, Pr)
27
26
25
Yes
Yes
Has the signal arrived at
IC6602?
TP6604, 6605, 6606
33
32
31
20
19
Check the communications
between IC8005 and
IC6601.
No
If no picture is displayed, press the POWER button to turn the power off then back on after a while.
When the red LED is flashing, the power has been Power down. Check how many times the LED is flashing.
(See the Power-down diagnosis on page 134.)
When the green LED is lit, follow the procedures below:
