Pioneer PDP-5000EX Service Manual page 77

5
Flowchart of Failure Analysis for The MAIN Assy (2)
Failure analysis for the
MAIN Assy. ⇒ MA3
The input signal is not displayed.
Is the selected input signal a
composite signal?
Yes
Is the selected input signal a
s-video signal?
Yes
A
Flowchart of Failure Analysis
for The MAIN Assy (3)
Waveforms
IC4601 - pin 49
1
V: 500 mV/div H: 20 µsec/div
IC5402 - pin 148
5
V: 200 mV/div H: 20 µsec/div
5
6
Check if Function corresponding to the input signal is selected.
Check also function settings, such as the HDMI setting, on the menu.
No
Is the selected input signal a
main or sub input signal?
Main
Are the displayed on the
"SG MODE: ANA MVDEC Y"
of the Factory menu correct?
No
Is the signal input to IC4601?
(pin 85)
Yes
No
Is the selected input signal a
main or sub input signal?
Main
Are the displayed on the
"SG MODE: ANA MVDEC Y"
of the Factory menu correct?
No
Is the signal input to IC4601?
(pin 93, 95)
Yes
Is the signal output from IC4601?
(pin 49, 47)(Waveforms 1, 2)
Yes
Is the signal input to IC5402?
(pin 148, 158)(Waveforms 5, 6)
Yes
Replace the MAIN Assy.
IC5402 and its peripheral circuits are in failure.
IC4601 - pin 47
2 3
V: 500 mV/div H: 20 µsec/div
IC5402 - pin 158
6 7
V: 200 mV/div H: 20 µsec/div
6
7
Sub
Yes
No
Replace the MAIN Assy.
Failure in the line between the JA4601 and IC4601.
Sub
Yes
No
Replace the MAIN Assy.
Failure in the line between the CN4601 and IC4601.
No
Replace the MAIN Assy.
IC4601 and its peripheral circuits are in failure.
No
Replace the MAIN Assy.
Failure in the line between the IC4601 and IC5402
or IC4601 and IC5403.
IC4601 - pin 45
4
V: 500 mV/div H: 20 µsec/div
IC5403 - pin 1
8
V: 100 mV/div H: 20 µsec/div
PDP-5000EX
7
8
Are the displayed on the
Yes
"SG MODE: ANA SVDEC Y"
of the Factory menu correct?
No
No
Is the signal input to IC4601?
(pin 85)
Yes
Are the displayed on the
Yes
"SG MODE: ANA SVDEC Y"
of the Factory menu correct?
No
No
Is the signal input to IC4601?
(pin 93, 95)
Yes
No Is the signal output from IC4601?
(pin 45, 42)(Waveforms 3, 4)
Yes
No
Is the signal input to IC5403?
(pin 1, 2)(Waveforms 7, 8)
Yes
Replace the MAIN Assy.
IC5403 and its peripheral circuits are in failure.
IC4601 - pin 42
V: 500 mV/div H: 10 µsec/div
IC5403 - pin 2
V: 100 mV/div H: 20 µsec/div
8
A
B
C
D
E
F
77