Troubleshooing; Troubleshooting - Pioneer PDP-501MX Service Manual

PDP-501MX, PDP-V501X

7.2.4. Troubleshooting

1. Power indicator LED states
Problems can be easily diagnosed by the power indicator (LED)
states of the display of the unit.
Display LED State
Lit in green
1.
Off
2.
Lit in red
3.
Blinking in red
4.
0.5/0.5 sec
Off
5.
Note 1) The LED may blink in green instead of red according to the
PD timing or where PD occurs.
82
State
Normally power ON
Display PD Note 1)
(Not remote controlled)
Display AC OFF
•
Power off by remote control
• Auto power OFF
•
When internal temperature is high
Display PD
AC OFF of the display
2. Abnormal Power Off Circuit
This unit comes equipped with various protection circuits.
When these protection circuit operates, P.D. (Power Down) operates
to turn off the relay (RL1) inside the POWER SUPPLY MODULE.
And turn off the power of the unit.
• X DRIVE (A) /(B) assembly
1) PD due to the over-current detection of the X drive power supply
V +12V
CP
2) PD due to the over-current detection of the X drive (+) reset
circuit
• Y DRIVE (A) /(B) assembly
1) PD due to the over-current detection of the Y drive power supply
V +12V
CP
2) PD due to the over-current detection of the Y drive (–) reset circuit
3) PD due to the over-voltage detection of the Y drive D-D converter
output V 150V
H
4) PD due to the over-current detection of the Y drive D-D converter
output V 150V
H
• POWER SUPPLY MODULE
1) PD due to the over-current detection of the large power supply
(V +175V, V +150V. V
SUS OFS
2) PD due to the over-voltage detection of the large power supply
(V +175V, V +40V, V
SUS CSP RN–
3) PD due to the over-current detection of the small signal power
supply (+12V, +5V, +3.3V)
4) PD due to the over-voltage detection of the small signal power
supply (+12V, +5V, +3.3V)
Note) +5V is supplied to K2609 and K3109 of the PD terminal of
each drive assembly when drive assembly PD occurs.
+40V, V –190V, V +30V).
CSP RN ADR
190V, V +30V)
ADR