Pioneer PDP-6071PU Service Manual page 97

5
No video from PC
⇒ COMP/PC2
Image for the PC signal is not
displayed.
Yes
Is the function corresponding to
selected signal input selected?
Yes
Has the signal arrived at IC4901?
(pin 8, 10, 12)
10 11 12
Yes
Is a signal output from IC4901?
(pin 41, 43, 45)
13 14 15
Yes
Has the signal arrived at IC5301?
(pin 43, 48, 54)
16 17 18
Yes
Is the communication between
each IC on the MAIN Assy and
the microcomputer nomal?
Yes
Has the symptom been settled
when the MAIN Assy is replaced?
Yes
Replace the MAIN Assy.
Waveforms
Input signal: Color-bar
IC4901 - pin 8 (PC_G)
10 13
V: 500 mV/div H: 20 µsec/div
IC4901 - pin 10 (PC_B)
11 15
V: 500 mV/div H: 20 µsec/div
IC4901 - pin 12 (PC_R)
12 17
V: 500 mV/div H: 20 µsec/div
5
6
No
Select the corresponding signal
with the input selector.
No
Check the communication between
the CN9003 and CN4013 and
around IC4901.
No
Check around IC4901 and check the
communications between IC4901
and the microcomputer. If there was
no ploblem replace the MAIN ASSY.
No
Check the circuit between IC4901 and
IC5301 and replace broken parts.
No
Check around the IC that is found to
have a failure in communication and
the microcomputer. If there was no
ploblem replace MAIN Assy.
No
The panel is defective.
IC4901 - pin 41 (component_PR) IC4901 - pin 41 (PC_R)
13
V: 500 mV/div H: 10 µsec/div V: 500 mV/div H: 10 µsec/div
IC4901 - pin 45 (component_Y) IC4901 - pin 45 (PC_G)
15
V: 500 mV/div H: 10 µsec/div V: 500 mV/div H: 10 µsec/div
IC5301 - pin 48 (component) IC5301 - pin 48 (PC)
17
V: 500 mV/div H: 10 µsec/div V: 500 mV/div H: 20 µsec/div
6
7
No
Replace flexible cable.
IC4901 - pin 43 (component_PB)
14
V: 500 mV/div H: 10 µsec/div
IC4901 - pin 43 (component)
16
V: 500 mV/div H: 10 µsec/div
IC5301 - pin 54 (component)
18
V: 500 mV/div H: 20 µsec/div
PDP-6071PU
7
8
IC4901 - pin 43 (PC_B)
14
V: 500 mV/div H: 10 µsec/div
IC4901 - pin 43 (PC)
16
V: 500 mV/div H: 10 µsec/div
IC5301 - pin 54 (PC)
18
V: 500 mV/div H: 20 µsec/div
97
8
A
B
C
D
E
F