Ricoh B121 - 4.3 BLOWN FUSE CONDITIONS

BLOWN FUSE CONDITIONS
B121 Series/B259 Series 4-14 SM
4.2.2 SWITCHES
Component CN Condition Symptom
Open
Upper Paper
Size
115-
1,2,4
(BICU)
Shorted
The CPU cannot detect the proper paper size,
and misfeeds may occur when a copy is made
from the 1st paper tray.
Open
The Cover Open indicator is lit even if the
vertical transport door is closed.
Vertical
Transport Door
110-5
(BICU)
Shorted
The Cover Open indicator is not lit even if the
vertical transport door is opened.
Open
Lower Paper
Size
113-
1,2,4
(BICU)
Shorted
The CPU cannot detect the proper paper size,
and misfeeds may occur when a copy is made
from the 2nd paper tray.
By-pass Paper
Size
136-
1,2,4,5
(BICU)
Open
The CPU misdetects or is not able to detect the
size of the paper set in the bypass tray, causing
possible misfeeds when feeding from this tray.
Open
The Cover Open indicator is lit even if the right
door is closed.
Right Door
124-5
(BICU)
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
130-1
(BICU)
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 15A/125V — No response.
FU2 6.3A/250V 3.15A/250V No response.
FU3 1A/125V 1A/250V
Anti-condensation/Tray Heater does not turn
on.
FU4 4A/250V 4A/250V No response.
FU5 4A/250V 4A/250V No response.
FU6 4A/250V 4A/250V SC901 is displayed.
FU7 4A/250V 4A/250V
Optional peripherals are detected but do not
function.
FU8 3.15A/250V 3.15A/250V No response.