Board Leds; Psu, Mcu, Ipu - Ricoh Neptune-P1 Service Manual

4. Troubleshooting

Board LEDS

This section describes the functions of the LEDs on the most important PCBs.

PSU, MCU, IPU

4
PSU LEDs
The PSU supplies dc current to electrical components and also controls the flow of ac current to the fusing
lamp, dehumidifiers (x4), and anti-condensation heaters (x2).
No.
Vaa +24 V
Vca2 –12 V
Vca2 +12 V
Vcc +5.1 V
222
Color
ON
GREEN
OFF
ON
GREEN
OFF
ON
GREEN
OFF
ON
GREEN
Meaning
Normal
• PSU defective, or the +24 V system has shorted or is
defective.
Normal
• PSU defective, or the –12 V system has shorted or is
defective.
Normal
• PSU defective, or the +12 V system (HDD) has shorted
or is defective.
Normal