Gestetner A294, Service Manual

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ELECTRICAL COMPONENT DESCRIPTIONS
SM 1-19 A294/A295
O
v
erall
Inf
o
rmat
ion
Symbol Name Function
SD1
Laser
Synchronization
Detector Detects the laser beam at the start of the main scan.
TC1 Total Counter Counts the number of copies.
TF1
Fusing Thermofuse Opens the fusing lamp circuit if the fusing unit
overheats.
TH1 Fusing Thermistor Detects the temperature of the hot roller.
1.7.2 ADF
Symbol Name Function Index No.
Motors
M1 Pick-up Moves the pick-up roller up and down. 3
M2
Feed-in Drives the feed belt, and the separation,
pick-up, and transport rollers.
8
M3 Transport Belt Drives the transport belt. 9
M4 Feed-out Drives the exit and inverter rollers. 14
M5 Bottom Plate Moves the bottom plate up and down. 7
Sensors
S1
APS Start Informs the CPU when the DF is opened
and closed (for platen mode) so that the
original size sensors in the copier can
check the original size.
12
S2 DF Position Detects whether the DF is lifted or not. 13
S3
Original Set Detects whether an original is on the
table.
19
S4
Bottom Plate HP Detects whether the bottom plate is in
the down position or not.
20
S5
Bottom Plate
Position Detects when the original is at the correct
position for feeding.
4
S6
Pick-up Roller HP
Detects whether the pick-up roller is up
or not.
2
S7
Entrance Detects when to restart the pick-up motor
to lift up the pick-up roller, detects when
to change the feed motor direction,
detects the trailing edge of the original to
finish checking the original length, and
checks for misfeeds.
26
S8
Registration Detects the leading edge of the original
to check the original length, detects when
to stop the original on the exposure
glass, and checks for misfeeds.
21
S9 Original Width 1 Detects the original width. 22
S10 Original Width 2 Detects the original width. 23
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