Ricoh B039 - Blown Fuse Conditions; Led Display; Bicu; Iob

BLOWN FUSE CONDITIONS
B039/B040/B043 4-10 SM
Component CN Condition Symptom
Open
The Cover Open indicator is lit even if the right
door is closed.
Right Door
331-5
(IOB)
Shorted
The Cover Open indicator is not lit even if the
right door is open.
Open
The Cover Open indicator is lit even if doors are
closed.
Front/Right
Cover
328-1
(IOB)
Shorted
The Cover Open indicator is not lit even if doors
are open.
Open The machine does not turn on.Main
281-3,4
(PSU)
Shorted The machine does not turn off.
4.3 BLOWN FUSE CONDITIONS
Rating
Fuse
120 V 220 – 240 V
Symptom when turning on the main switch
Power Supply Board
FU1 15 A/125 V — No response.
FU2 6.3 A/250 V 3.15 A/250 V No response.
FU3 2 A/125 V 2 A/250 V
Anti-condensation/Tray Heater does not turn
on.
FU4 4 A/125 V 4 A/250 V
Optional peripheral(s) are detected but do not
function.
FU5 4 A/125 V 4 A/250 V
The Cover Open indicator is lit then SC901 is
displayed.
FU6 3.15 A/125 V 3.15 A/250 V
LEDs are not lit and the LCD display does not
function (backlight only).
4.4 LED DISPLAY
4.4.1 BiCU
Number Function
LED 1
Monitors the +5 V line for the CPU and the surrounding
circuit.
Usually, this LED is blinking.
LED 2
Monitors the +5 V line.
Usually, this LED is lit.
4.4.2 IOB
Number Function
LED301
Monitors the connection between the IOB and the BiCU.
Usually, this LED is blinking.