Ricoh B089 - Page 431

ELECTRICAL COMPONENT DEFECTS
SM 7-23 B089/B093
Trouble-
shooting
7.5.2 SWITCHES
Component
(Symbol)
CN Condition Symptom
Open The machine does not turn on.
Main
281-1,2
(PSU)
Shorted The machine does not turn off.
Open
The Cover Open indicator is not lit even if
the right upper cover is opened.
Right Upper
Cover
324-8
(SBCU)
Shorted
The Cover Open indicator is lit even if the
right upper cover is closed.
Open
The Cover Open indicator is not lit even if
the right cover is opened.
Right Cover
308-9
(SBCU)
Shorted
The Cover Open indicator is lit even if the
right cover is closed.
Open
The Cover Open indicator is not lit even if
the right lower cover is opened.
Right Lower
Cover
307-A8
(SBCU)
Shorted
The Cover Open indicator is lit even if the
right lower cover is closed.
Open
Upper Paper
Size
308-1,2,4,5
(SBCU)
Shorted
The CPU cannot detect the proper paper
size, and misfeeds may occur when a copy
is made.
Open
Lower Paper
Size
308-6,7,9,10
(SBCU)
Shorted
The CPU cannot detect the proper paper
size, and misfeeds may occur when a copy
is made.
Open
The TD sensor initial setting procedure is
not performed when a new PCU is
installed.
New PCU
Detect
327-7
(SBCU)
Shorted
The TD sensor initial setting procedure is
performed whenever the front cover is
closed.
Open
The Cover Open indicator is not lit even if
the front cover is opened.
Front Cover
Safety
311-2, 4
(SBCU)
Shorted
The Cover Open indicator is lit even if the
front cover is closed.
Open
The LCD does not off even if the operation
switch is turned off.
Operation
105-1
(IPU
Shorted
The LCD does not on even if the operation
switch is turned on.