Pioneer f-502 Service Manual page 26

This unit has self-diagnosis functions against abnormalities in the internal circuits and other operational abnormalities, and if any abnormality is
detected, the STANDBY/ON indicator (LED) blinks to alert you of it.
How the indicator blinks and possible failure points and power-down points are explained below:
Shutdown
• Operations : When a microcomputer has detected an abnormality, it turns the power supply to OFF.
• LED display : Blinking in green
Example: How the LED blinks when DIGITAL-IIC communications fail
Green LED lights
for 200 msec.
Number of
blinking
1 Panel Microcomputer failure
2 DIGITAL-IIC communication failure
4 Temperature abnormality
Power-down
• Operations : In an emergency, the protection circuits are activated, and the power is turned off.
• LED display : Blinking red
Note: If more than two protection circuits are activated at almost the same time, the LED indicates this by its
blinking-pattern.
Example: How the LED blinks for the first power-down (Y-DC/DC CONVERTER) and the second power-down (Y DRIVE)
1st power-down information
Red LED lights
for 200 msec.
Number of
Failure Point
blinks
1 Y-DRIVE
2 Y-DC/DC CONVERTER
3 X-DC/DC CONVERTER
4 X-DRIVE
5 Power supply
6 Address junction
7 Address resonance
8 DIGITAL-DC/DC CONVERTER
Extinguished
for 100 msec
Extinguished
for 3 sec
Reason
How to release shutdown
Press the power key on the remote control to switch the unit back on.
(It is not necessary to press the MAIN POWER button to turn off the unit.)
Extinguished Red LED lights
for 100 msec for 200 msec.
How to release power-down
Set the MAIN POWER button to OFF, and wait for about 30 seconds until
the LED for PD (power-down) in the power-supply module is extinguished.
Wait another 5 seconds, then recover the unit by setting the MAIN
POWER button to ON.
Note: After power-down is released, the unit restarts and goes to Standby
mode.
PDP-433PU
Green LED lights
for 200 msec.
Extinguished
for 1 sec
Extinguished
for 3 sec
PDP-503PU
26
2nd power-down
information
Red LED lights
for 200 msec.