Ricoh Neptune-P1 Service Manual page 224

No. Color
Vcc1 +5.1 V GREEN
MCU LEDs
The MCU (Main Control Unit) performs system control, base engine control, and also controls the IPU. The
MCU also controls:
• I/O for the base engine (high voltage power supply, motors, sensors, solenoids, clutches, fusing
temperature, customer support systems, etc.)
• Power supply
MCU LED 1 to 4
No. Color
LED 1 GREEN
LED 2 GREEN
LED 3 ORANGE
LED 4 ORANGE
IPU LEDs
The IPU (Image Processing Unit) processes the image data for the print job. After the scan data has been
processed, it is sent through the VDB to the LPH for image writing.
• PSU defective, or the +5.1 system (Vcc2) has shorted
OFF
or is defective.
ON Normal. Also remains on in auto off mode.
• PSU defective, or the +5.1 system (Vcc1) has shorted
OFF
or is defective.
Operation
Firmware update
End of firmware update, normal operation
Firmware update
End of firmware update, normal operation
Firmware update
End of firmware update, normal operation
Firmware update
End of firmware update, normal operation
Meaning
LED Action
Flashes rapidly
Flashes slowly
On
Off
Flashes rapidly
Flashes slowly
On
Off
Board LEDS
4
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