Pioneer PDP-5020FD Service Manual page 63

5
=> COMP/PC2
Image for the PC signals is not
displayed.
Yes
Is the function corresponding to
selected signal input selected?
Yes
Has the signal arrived at IC8101?
(RGBSW) (pins 2, 4, 6, 14, 15)
25 26 27
Yes
Which signal is not output,
main or sub signal?
MAIN
Is a signal output from IC8101?
(RGBSW) (pins 30, 32, 34)
30 31 32
Yes
Has the signal arrived at IC4801?
(ADC) (pins 43, 48, 54)
33 34 35
Yes
Is the communication between
each IC (ADC, ASIC) on the
MAIN Assy and the microcomputer
normal?
Yes
Replace the MAIN Assy.
Waveforms
Input signal: Color-bar (PC SXGA/60 Hz)
IC8101 - pin 2 (G in)
25 26
V: 500 mV/div H: 10 μsec/div
IC8101 - pin 34 (G out)
30 31
V: 500 mV/div H: 10 μsec/div
IC4801 - pin 54 (R)
35
V: 500 mV/div H: 10 μsec/div
5
6
No
Select the corresponding signal
with the input selector.
No Check the 12P FFC (J215) between IO Assy and
PC. If there was problem, replace it.
28 29
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.
No
Check the 40P FFC (J214) between MAIN Assy and
IO Assy. If there was problem, replace it.
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 4 (B in) IC8101 - pin 6 (R in)
27
V: 500 mV/div H: 10 μsec/div V: 500 mV/div H: 10 μsec/div
IC8101 - pin 32 (B out) IC8101 - pin 30 (R out)
32
V: 500 mV/div H: 10 μsec/div V: 500 mV/div H: 10 μsec/div
6
7
No
Specifications that does not
display in the sub-side.
IC8101 - pin 14 (HD in)
28
V: 1 V/div H: 10 μsec/div
(polarity is no care)
IC4801 - pin 48 (G)
33
V: 500 mV/div H: 10 μsec/div
PDP-5020FD
7
8
A
B
C
D
IC8101 - pin 15 (VD in)
29
V: 1 V/div H: 2 msec/div
(polarity is no care)
IC4801 - pin 43 (B)
34
V: 500 mV/div H: 10 μsec/div
E
F
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