Pioneer PDP-6071PU Service Manual page 96

1
A
No video from component
⇒ COMP/PC1
Image for the component signals
is not displayed.
Yes
Is the function corresponding to
selected signal input selected?
Yes
Has the signal arrived at IC4901 ?
B
Yes
What is a input signal ?
Input sigal: except 480i
Is a signal output from IC4901?
(pin 41, 43, 45)
13 14
Yes
Has the signal arrived at IC5301?
(pin 43, 48, 54)
16 17
C
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.
D
E
F
96
1
2
No
Select the corresponding signal
with the input selector.
No
Check the communication between
the CN8802 and CN4004 or
between CN8803 and CN4005 or
around of jack.
Input sigal: 480i
No
Check around IC4901 and check the
communications between IC4901
15
and the microcomputer. If there was
no ploblem replace the MAIN ASSY.
No
Check the circuit between IC4901 and
IC5301 and replace broken parts.
18
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)
13 13
V: 500 mV/div H: 10 µsec/div
IC4901 - pin 45 (component_Y)
15 15
V: 500 mV/div H: 10 µsec/div
IC5301 - pin 48 (component)
17 17
V: 500 mV/div H: 10 µsec/div
2
3
No
Replace flexible cable.
No
Is a signal output from IC4901?
(pin 30, 32, 34)
Yes
Has the signal arrived at IC5101 ?
(pin 154, 162, 170)
Yes
IC4901 - pin 41 (PC_R) IC4901 - pin 43 (component_PB)
14
V: 500 mV/div H: 10 µsec/div V: 500 mV/div H: 10 µsec/div
IC4901 - pin 45 (PC_G) IC4901 - pin 43 (component)
16
V: 500 mV/div H: 10 µsec/div V: 500 mV/div H: 10 µsec/div
IC5301 - pin 48 (PC) IC5301 - pin 54 (component)
18
V: 500 mV/div H: 20 µsec/div V: 500 mV/div H: 20 µsec/div
PDP-6071PU
3
4
No
Check the circuit between IC4901 and
IC5101 and replace broken parts.
Waveforms
Input signal: Color-bar
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
4