Board Leds; Psu, Mcu, Ipu; Psu Leds - Ricoh B286 Service Manual

4.7 BOARD LEDS

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

4.7.1 PSU, MCU, IPU

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. Color
Vaa +24 V GREEN
Vca2 –12 V GREEN
Vca2 +12 V GREEN
Vcc +5.1 V GREEN
SM
ON Normal
! PSU defective, or the +24 V system has shorted or
OFF
is defective.
ON Normal
! PSU defective, or the –12 V system has shorted or
OFF
is defective.
ON Normal
! PSU defective, or the +12 V system (HDD) has
OFF
shorted or is defective.
ON Normal
OFF ! PSU defective, or the +5.1 system (Vcc2) has
4-45
Meaning
Board LEDS
B286/B289