Pioneer PRO-141FD Service Manual page 60

1
A
=> COMP (INPUT 2/INPUT 3)
A component input signal is
not displayed.
Yes
Is INPUT 2 or INPUT 3 selected
with the Input Selector?
Yes
B
No image or an abnormal image
is displayed when a signal is
input to INPUT 2.
No
E
C
No image or an abnormal image
is displayed when a signal is
input to INPUT 3.
D
Is a signal input to IC5001
(ADC)? (pins 2, 6, 14)
10
Yes
Replace the MAIN Assy.
Waveforms
Input signal: Color-bar (Component 720p/50 Hz)
IC4701 - pin 110 (Y in)
4
V: 500 mV/div H: 20 μsec/div
E
IC4701 - pin 85 (Pr out)
9
V: 500 mV/div H: 20 μsec/div
F
60
1
2
• Check if the unit is in Energy Save mode.
• Check if the unit is in Video OFF mode.
No
Select INPUT 2 or 3.
Is a signal properly input/output to/from the
Yes
JA4601 input terminal, external connecting
cord, and the MAIN Assy?
Is a signal input to IC4701 (RGB SW)?
(pins 109, 110, 111)
Is a signal output from IC4701?
(RGB SW) (pins 81, 83, 85)
Is a signal properly input/output to/from the
Yes
CN4601 input terminal, external connecting
cord, and the MAIN Assy?
Is a signal input to IC4701 (RGB SW)?
(pins 100, 101, 102)
Is a signal output from IC4701?
(RGB SW) (pins 81, 83, 85)
Yes Failure in parts located between
IC4701 and IC5001, or breakage
in the signal lines
11 12
IC4701 - pin 109 (Pb in) IC4701 - pin 111 (Pr in)
5 6
V: 500 mV/div H: 20 μsec/div V: 500 mV/div H: 20 μsec/div
IC5001 - pin 6 (Y in) IC5001 - pin 2 (Pb in)
10 11
V: 500 mV/div H: 20 μsec/div V: 500 mV/div H: 20 μsec/div
2
3
Note: If a component signal is input to INPUT 3, the video signal
mode must be set to YPbPr with INPUT SETUP.
Repair the soldered portion that is lifted
No
off the board at JA4601 or replace the
defective JA4601
Yes
Failure in parts located between
No
JA4601 and IC4701, or breakage
in the signal lines
4 5 6
Yes
No
Failure in IC4701
7 8 9
Yes
Repair the soldered portion that is lifted
No
off the board at CN4601. Or, as JA4601
is defective, replace the MAIN Assy.
Yes
Failure in parts located between
No
CN4601 and IC4701, or breakage
in the signal lines
4 5 6
Yes
No
Failure in IC4701
7 8 9
Yes
IC4701 - pin 83 (Y out)
7
V: 500 mV/div H: 20 μsec/div
IC5001 - pin 14 (Pr in)
12
V: 500 mV/div H: 20 μsec/div
PRO-141FD
3
4
Replace the MAIN Assy.
Replace the MAIN Assy.
IC4701 - pin 81 (Pb out)
8
V: 500 mV/div H: 20 μsec/div
4