Pioneer PDP-42MXE20, Service Manual, Page: 36 / 120

PDP-427CMX
36
1 2 3 4
1 2 3 4
C
D
F
A
B
E
YES
YES
Are the PWM waveforms output from Pins
41, 43, 47 and 48 of IC3002?
Is the 9 V DC applied to the both ends of
L3005 and L3006?
Failure in the power supply
unit or the CN3002 connection
cable
YES
Failure in the IC3002
Failure in the IC3002
NO
NO
Failure in the IC3001, IC3002 and IC3004
NO
YES
Failure in the IC3001
YES
Are the voltages shown in the table below
output from each pin of the PA connector
(CN3003) on the AUDIO PWB?
YES
Is the audio signal waveform output from
Pin 11 of IC3001?
Are the waveforms shown below output
from the AU connector (CN3004)
on the MAIN PWB?
NO
Pin_No.
1
2
3
4
5
6
Name
S + 12
S + 12
S + 12
GND
GND
GND
Voltage
12.5Vdc
12.5Vdc
12.5Vdc
GND
GND
GND
Pin 8
Pin 9
Pin 7
Pin 5
Pin 8
Pin 9
Pin 7
Pin 5
Pins 1 and 3: Audio signal waveform
5Vpp
5Vpp
9.0Vdc
3.3Vdc
Failure in the CN9001 connection
cable (AU connector)
YES
Are the waveforms shown below
output from the AU connector (CN9001)
on the MAIN PWB?
NO
NO
5Vpp
5Vpp
9.0Vdc
3.3Vdc
A
B
Waveform 43
Waveform 44
Waveform 45
Pins 1 and 3: Audio signal waveform
Waveform 45