Pioneer PDP-5010FD, Руководство по обслуживанию

Страница: 55 / 187

PDP-5010FD
55
5 6 7 8
5 6
7
8
C
D
F
A
B
E
Flowchart of Failure Analysis for The Video System
Is the function correspondeing to
selected signal input selected? Select the corresponding signal
with the Input selector.
No video from Composite or S-VIDEO
No
Disconnect component and
confirm again.
No
Check the circuit between IC4601 and
IC4801 and replace broken parts.
No
The panel is defective.
No
Check around IC4601 and check the
communications between IC4601
and microcomuputer. If there was
no ploblem replace IC4601.
No
Check around the IC that is found to
have failure in communication and
the microcomputer. If there was no
ploblem replace MAIN Assy
No
No
No
Replace the TANSHI Assy.
Replace the MAIN Assy.
NG
Check the flexible cable between
CN8804 and CN4004.
Check the flexible cable between
CN8803 and CN4001.
No
Replace or reconnect flexible cable.
NG
Yes
Yes
Image for the composite or S-video
signal is not displayed.
=> COMP/S
Is the compornent cable is
connect to jack? (Input1 to Input3)
Has the signal arrived at IC4601?
(pins 85, 91, 72)
Yes
Which signal is not output,
main or sub signal?
Is a signal output from IC4601?
(pins 42, 45)
Yes
Has the signal arrived at IC4801?
(pins 22, 26)
Yes
Has the symptom been settled
when the MAIN Assy is replaced?
Yes
Yes
Is the communication between
each IC on the MAIN Assy and the
microcomputer normal?
Yes
Has the signal arrived at IC4801?
(pin 70)
Yes
MAIN
SUB
1
4
8
Is a signal output from IC4601?
(pin 49)
5
6
3
7
1
IC4601 - pins 85, 91, 72
V: 500 mV/div H: 20
μ
sec/div
2
IC4701 - pin 57
V: 500 mV/div H: 20
μ
sec/div
3
IC4601 - pin 42 (S-video)
V: 500 mV/div H: 20
μ
sec/div
4 4
IC4601 - pin 45 (Composite)
V: 500 mV/div H: 20
μ
sec/div
IC4601 - pin 45 (S-video)
V: 500 mV/div H: 20
μ
sec/div
5
IC4601 - pin 49 (Composite)
V: 500 mV/div H: 20
μ
sec/div
6
IC4801 - pin 70 (Composite)
V: 500 mV/div H: 20
μ
sec/div
7 7
IC4801 - pin 22 (Composite)
V: 500 mV/div H: 20
μ
sec/div
IC4801 - pin 22 (S-video)
V: 500 mV/div H: 20
μ
sec/div
8
IC4801 - pin 26 (S-video)
V: 500 mV/div H: 20
μ
sec/div
Waveforms
Input signal: Color-bar