Pioneer PDP-42A3HD Service Manual page 62

1
1. No Power
Preliminary Checkpoints
A
Check the condition of the input power &cable connection.
(JP730,JP701(DTT&Analog, JP709(Digital),JP230(AMP))
Check the condition of on-board regulators.
Check for short circuits between each power terminal and the ground.
B
C
D
E
F
T01
62
1
2
No Power
When Powered ON
#1(M-7V)
at JP730
In Digital B/D
Waveform 1
#3(Power)
at JP730
In digital Board
Waveform 2
#5(POMUTE)
at JP730
In digital Board
Waveform 3
#74,75
at U29
in digital B/D
Waveform
The signal waveform
of X3
in digital B/D
Waveform 5
The data line waveform
of U28
Waveform
Change Digital B/D
PDP-42A3HD
2
3
NG
NG
Check SMPS &Micom
NG
Check SMPS &Power Line
NG
Check the state of soldering
4 - 1
NG
Check the input power
NG
6 - 1
3
4
Check SMPS
Block(U29)
in Digital B/D
in U401,U800,U29
part in U29
Check the U28 and
related Circuit
4
T01