Pioneer PDP-5020FD Service Manual page 62

1
A
=> COMP/PC1
Image for the component signal
is not displayed.
Yes
Is the function corresponding to
selected signal input selected?
Yes
Has the signal arrived at IC8101?
B
(RGBSW) (pins 86, 88, 90)
16 17
Yes
Which signal is not output,
main or sub signal?
MAIN
Is a signal output from IC8101?
(RGBSW) (pins 30, 32, 34)
19 20
Yes
C
Has the signal arrived at IC4801?
(ADC) (pins 43, 48, 54)
22 23
Yes
Is the communication between
each IC (ADC, ASIC) on the
MAIN Assy and the microcomputer
normal?
Yes
Replace the MAIN Assy.
D
Waveforms
Input signal: Color-bar (Component 720p/50 Hz)
IC8101 - pin 86 (Y)
16
V: 500 mV/div H: 20 μsec/div
E
IC8101 - pin 30 (Pr)
21
V: 500 mV/div H: 20 μsec/div
F
62
1
2
No
Select the corresponding signal
with the input selector.
No
Check around the input terminals.
18
SUB
Is the screen of main side Tuner?
Yes
No
Check around IC8101 and check the communications
between IC8101 and microcomuputer.
If there was no ploblem, replace the IO Assy.
21
No
Check the 40P FFC (J214) between MAIN Assy and
IO Assy. If there was problem, replace it.
24
Check around the IC that is found to have failure in
No
communication and the microcomputer.
If there was no ploblem, replace the MAIN Assy.
IC8101 - pin 88 (Pb) IC8101 - pin 90 (Pr)
17 18
V: 500 mV/div H: 20 μsec/div V: 500 mV/div H: 20 μsec/div
IC4801 - pin 48 (Y) IC4801 - pin 43 (Pb)
22 23
V: 500 mV/div H: 20 μsec/div V: 500 mV/div H: 20 μsec/div
2
3
NG
Replace the IO Assy.
No
Specifications that does not
display in the sub-side.
IC8101 - pin 34 (Y)
19
V: 500 mV/div H: 20 μsec/div
IC4801 - pin 54 (Pr)
24
V: 500 mV/div H: 20 μsec/div
PDP-5020FD
3
4
IC8101 - pin 32 (Pb)
20
V: 500 mV/div H: 20 μsec/div
4