Gestetner B147, Service Manual

Page: 284 / 1081

ELECTRICAL COMPONENT DEFECTS
B147/B149/B190 4-82 SM
4.7 ELECTRICAL COMPONENT DEFECTS
4.7.1 SENSORS
Component CN Condition Symptom
Open SC121
Scanner Home
Position
632-A2
Shorted SC120
Open
APS and ARE do not function
properly.
Platen Cover 648-2
Shorted No symptom
Open
CPU cannot detect the original size
properly. APS and ARE do not
function correctly.
Original Width 632-A
Shorted
Open
CPU cannot detect the original size
properly. APS and ARE do not
function correctly.
Original Length-1 632-B
Shorted
Open
CPU cannot detect the original size
properly. APS and ARE do not
function correctly.
Original Length-2 632-B
Shorted
Open SC261
LD H.P. sensor 220-B12
Shorted SC260
Open SC370/371/372/373
TD sensor
K: 210-A3
C: 210-B9
M: 209-A19
Y: 210-A9
Shorted
SC370/371/372/373 or
SC374/375/376/377
Open
Transfer belt
sensor
210-A12
Shorted
SC471
Open
ID sensor
Rear: 228-3
Center: 228-4, 7
Front: 228-8
Shorted
SC385
Open
The Paper End indicator lights even
if paper is placed in the paper tray.
Paper end sensor
Tray1: 205-A5
Tray2: 205-B9
By-pass: 209-A15
Shorted
The Paper End indicator does not
light even if there is no paper in the
paper tray.
Open
The bottom plate of the paper feed
unit is not lifted up.
Paper lift sensor
Tray1: 205-A2
Tray2: 205-B6
Shorted SC501/502
Open
Paper Jam is detected whenever a
print is made.
Relay sensor 205-A8
Shorted
Paper Jam is detected even if there
is no paper.
Open
Paper Jam is detected whenever a
print is made.
Vertical transport
sensor
208-B11
Shorted
Paper Jam is detected even if there
is no paper.