Sharp AR-810 (serv.man13) Service Manual ▷ View online
AR-651/810 PAPER FEEDING SECTION 9 - 9
b) Call for service
(1) When the tandem LCF tray-up sensor is not turned ON even through a specified time has passed since
the tray started to be raised, it is assumed that the tray cannot be used (there is no paper) and the
corresponding message is displayed on the control panel.
(2) When the tandem LCF tray bottom sensor is not turned ON even through a specified time has passed
since the tray started to be lowered, it is assumed that the tray cannot be used (there is no paper) and
the corresponding message is displayed on the control panel.
(3) When the end fence stop position sensor is not turned ON even through a specified time has passed
since the end fence started to move the paper in the standby side tray, it is assumed that the tray
cannot be used (there is no paper) and the corresponding message is displayed on the control panel.
(4) When the end fence home position sensor is not turned ON even through a specified time has passed
since the end fence started to move the paper in the standby side, it is assumed that the tray cannot
be used (there is no paper) and the corresponding message is displayed on the control panel.
(5) The states (1) to (4) are cleared by removing the tray unit.
AR-651/810 PAPER FEEDING SECTION 9 - 10
9. 4. Drive Circuit for Tray-up Motor
Cassette tray-up motor (MOT)
: Driven by IC72 (tray-up motor 1) and IC36 (tray-up motor 2)
(LGC: TA8428)
Block diagram of TA8428
1
2
3
4
5
6
7
IN1
IN2
M(+)
GND
M(–)
N.C.
V
CC
IN1 and IN2 are input terminals to receive the signals from the microcomputer. The control logic, based on
the signals from the microcomputer, controls the rotation direction and ON/OFF of the motor.
Input
Output
IN1
IN2
M (+)
M (–)
Remarks
H
H
L
L
BRAKE
L
H
L
H
CW
H
L
H
L
CCW
L
L
OFF (high impedance) STOP
Control logic
Thermal shut-
down over-
current protec-
tion circuit
down over-
current protec-
tion circuit
AR-651/810 PAPER FEEDING SECTION 9 - 11
9. 5. Disassembly and Replacement
[A] Feed unit
(A-1) Pickup roller/Feed roller/Separation roller
(1) Remove the feed side rear cover.
(2) Open the feed side center cover and disconnect
1 connector.
(3) Remove 2 pins and lift the bypass feed unit with
the feed side center cover to take off.
(4) Open the feed side bottom cover and lift it to
take off.
(5) Pull out the cassette or tandem LCF completely.
Note: With failing that, sensors may be damaged.
(6) Disconnect 1 connector, remove 3 screws and
take off the feed unit.
Connector
AR-651/810 PAPER FEEDING SECTION 9 - 12
(7) Remove 1 clip and take off the pickup roller.
(8) Remove 3 screws and take off the guide.
(9) Remove 1 clip and take off the feed roller.
(10)Remove 1 clip and take off the separation roller.
Clip
Feed roller
Separation roller
Clip
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