Pioneer PRO-141FD Service Manual page 61

5
=> D-SUB (INPUT 3)
A signal input to D-SUB is
not displayed.
Yes
Is INPUT 3 selected with the
Input Selector?
Yes
No image or an abnormal image is displayed when a
component signal is selected as an input signal.
No (No image or an abnormal image is displayed when an RGB signal is selected as an input signal.
Has the signal arrived at IC4701? (RGB SW)
(pins 92-94, 35, 37)
13 14 15
Yes
Is a signal output from IC4701?
(RGB SW) (pins 81, 83, 85)
18 19
Yes
Has the signal arrived at IC5001?
(ADC) (pins 2, 6, 14)
21 22 23
Yes
Replace the MAIN Assy.
Waveforms
Input signal: Color-bar (PC SXGA/60 Hz)
IC4701 - pin 93 (G in) IC4701 - pin 92 (B in)
13 14
V: 500 mV/div H: 10 μsec/div V: 500 mV/div H: 10 μsec/div
IC4701 - pin 83 (G out) IC4701 - pin 81 (B out)
18 19
V: 500 mV/div H: 10 μsec/div V: 500 mV/div H: 10 μsec/div
IC5001 - pin 14 (R in)
23
V: 500 mV/div H: 10 μsec/div
5
6
• Check if the unit is in Power Management mode.
• Check if the unit is in Video OFF mode.
No
Select INPUT 3.
Yes
No
Failure in CN4601 or in parts located between CN4601
and IC4701, or breakage in the signal lines
16 17
No
Failure in IC4701
20
No
Failure in parts located between IC4701 and
IC5001, or breakage in the signal lines
IC4701 - pin 94 (R in)
15
V: 500 mV/div H: 10 μsec/div
IC4701 - pin 85 (R out)
20
V: 500 mV/div H: 10 μsec/div
PRO-141FD
6
7
E
IC4701 - pin 35 (HD in)
16
V: 1 V/div H: 10 μsec/div
(polarity is no care)
IC5001 - pin 6 (G in)
21
V: 500 mV/div H: 10 μsec/div
7
8
A
B
C
D
IC4701 - pin 37 (VD in)
17
V: 1 V/div H: 2 msec/div
(polarity is no care)
IC5001 - pin 2 (B in)
22
V: 500 mV/div H: 10 μsec/div
E
F
61
8