Pioneer PDP-5050SX Service Manual page 145

5
Image for the component signal is not displayed
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:
Image for the component
signal is not displayed
No
Is the function corresponding
No Select the corresponding
to selected signal input
selected?
Yes
Has the signal arrived at
No
IC8005?
Yes
Subsignal
Which signal is not output,
main or subsignal?
Main signal
Is a signal output from
No
IC8005?
(43), (44), (46), (Pr, Pb, Y)
16 17 18
Yes
Has the signal arrived at
IC6401? No
(7), (27), (3), (Y, Pb, Pr)
22 23 24
Yes
Has the signal arrived at
IC6402? No
TP6402, 6403, 6404
28 29 30
Yes
Is the communication
No
between each IC on the
MAIN BOARD Assy and
the microcomputer normal?
Yes
Has the symptom been
No
settled when the MAIN
BOARD Assy is replaced?
Yes
Finishing troubleshooting
5
6
signal with the Input selector.
Check the communication
between the jack and
IC8005.
Check around IC8005 and
check the communications
between IC8005 and the
microcomputer.
Check the communications
between IC8005 and
IC6401.
Check the communications
between IC6401 and
IC6402.
Check around the IC that is
found to have a failure in
communication and the
microcomputer.
The panel is defective.
PDP-5050SX
6
7
Is a signal output from
No IC8005?
(35), (36), (38),(Pr, Pb, Y)
19 20 21
Yes
Has the signal arrived at
IC6601?
(7), (27), (3), (Y, Pb, Pr)
25 26 27
Yes
Has the signal arrived at
IC6602?
TP6604, 6605, 6606
31 32 33
Yes
7
8
Check the communications
No
between IC8005 and
IC6601.
Check the communications
No
between IC8005 and
IC6601.
8
A
B
C
D
E
F
145