3. ELECTRICAL COMPONENT DEFECTS
3.1 SENSORS
Component Condition Symptom
4th/5th Mirror Home Position
Sensor (S1)
Stays HIGH
(CN114-2)
Service code E2B is displayed.
Stays LOW
(CN114-2)
Service code E2A is displayed.
ADS Sensor (S2) Stays HIGH
(CN114-5)
The image density will be abnormal.
(Dirty background)
Stays LOW
(CN114-5)
The image density will be abnormal.
(Light copies)
Tray Paper End Sensor (S3) Stays HIGH
(CN109-6)
The Load Paper indicator lights even if
paper is present.
Stays LOW
(CN109-6)
The Load Paper indicator does not light
even if there is no paper.
Registration Sensor (S4) Stays HIGH
(CN125-2)
Paper misfeed type A occurs whenever
a copy is mode.
Stays LOW
(CN125-2)
The Paper Misfeed B indicator lights
even if there is no paper.
By-pass Feed Paper End
Sensor (S5)
Stays HIGH
(CN125-4)
The Load Paper indicator lights even if
paper is placed on the by-pass feed
table.
Stays LOW
(CN125-4)
The Load Paper indicator does not light
even if there is no paper on the by-pass
feed table.
Exit Sensor (S6) Stays HIGH
(CN127-2)
Paper misfeed type C occurs whenever
a copy is mode.
Stays LOW
(CN127-2)
The Paper Misfeed C indicator lights
even if there is no paper.
Scanner Home Position Sensor
(S7)
Stays HIGH
(CN120-2)
Service code E22 is displayed.
Stays LOW
(CN120-2)
Service code E21 is displayed.
Lens Home Position Sensor (S8) Stays HIGH
(CN115-2)
Service code E29 is displayed.
Stays LOW
(CN115-2)
Service code E28 is displayed.
Toner Density (TD) Sensor (S9) Stays HIGH
(CN124-5)
The toner near/end condition will not be
cleared even if new toner is added.
Stays LOW
(CN124-5)
User code U6 is displayed when
installing a new developer. During
normal usage, the Manual Image
Density or the ADS indicators start
blinking.
Trouble-
shooting
20 December 1996 ELECTRICAL COMPONENT DEFECTS
7-29
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