Troubleshooting (Tuner Module); No Power - Pioneer PDP-42A3HD Training & Troubleshooting Manual

1. No Power

Preliminary Checkpoints
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.
The data line waveform
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
of U28
Waveform
Change Digital B/D
NG
NG
NG
NG
4,4 - 1
NG
NG
6,6 - 1
32
Check SMPS
(Power Supply Board)
Check SMPS &Micom
Block(U29)
Check SMPS &Power Line
in Digital B/D
Check the state of soldering
in U401,U800,U29
Check the input power
part in U29
Check the U28 and
related Circuit