Panasonic FA-A888 Service Manual ▷ View online
3-10
(2) ADF open/close detecting switch adjustment
• Perform this adjustment when the ADF open/close action is not detected.
1) Open the ADF.
2) Remove the ADF CPU cover (3 screws with star washers).
3) Loosen the screw retaining the switch lever.
4) Turn the switch lever in the direction of the arrow. Open the ADF 10 to 70mm
from the copier, and close the ADF 10 to 30mm from the copier, while checking
the display of copier.
SV036
ADF open/close
switch
switch
Switch lever
Screw
Copier upper
cover (Rear)
cover (Rear)
5) Slide the switch lever so the ADF open/close switch is actuated when the
ADF is opened 10 to 30mm from the platen glass. Confirm by placing an
original in the infeed guide and opening/closing the ADF while watching the
copier display.
3-11
Maintenance
SV043
(3) Registration sensor and original exit/reverse sensor adjustment
• Perform this adjustment after replacing ADF CPU P.C.B. , registration sensor or
original exit/reverse sensor.
NOTE: Make sure no originals are in the ADF.
1) Turn the copier power switch OFF.
2) Remove the ADF service cover (1 screw).
6) When the sensor adjustments are completed, the LED will turn OFF.
If an adjustment error is detected, the LED will be illuminated as follows:
a) Registration roller sensor:
Lights up
b) Timing sensor:
Flashes slowly (100msec interval)
c) Exit/Reverse sensor:
Flashes quickly (500msec interval)
Repeat steps 1 to 5. If an error still remains, replace the indicated defective
sensor and repeat the procedure.
5) The sensor adjustment and E2PROM initialization will be automatically
performed when the push switch (PSW1) is pressed on the ADF CPU PCB.
7) Turn OFF the all DIP switches (SW1) on the ADF CPU PCB after the adjustment
and turn the copier power switch OFF and ON.
8) Re-install the ADF service cover.
3) Set the ADF CPU PCB dip switches as follows:
4) Turn the copier power switch ON. The LED of ADF CPU PCB will flash.
(This is normal before pressing PSW1.)
Service cover
SV043
1
2
3
4
5
ON
OFF
4-1
Electrical
•Detects the original feed status and counts the number of originals.
1) When the paper feed roller is rotated, an original is fed to the registration roller,
then registration roller rotates to feed the original. The registration roller sensor
counts the number of originals which pass and informs the copier.
Original detecting sensor lever
Original detecting sensor
Original stopper
Timing sensor
Pick up roller
Regist roller sensor
( Registration roller sensor )
Regist roller
Original
feed roller
feed roller
SV037
4. Electrical
4. 1 Function of electrical parts
(1) Original detecting sensor / Registration roller sensor
( Original detecting sensor )
•Detects originals in the original feed tray.
1) When an original is loaded in the original feed tray, it will contact the original
stopper. The original detecting sensor lever, which is positioned in front of the
original stopper, is raised and detects the presence of an original.
2) As soon as the original is detected, the ADF indicator in the copier's display
lights up and ADF operation is enabled.
4-2
1
3
4
2
( Timing sensor )
•Detects the tail edge of original
1) During registration roller operation, an original is fed to the transport belt. At the
same time, the timing sensor detects the tail edge of the original to control
original feed operation.
(
2)Weight / Stopper solenoid
1) When the weight/stopper solenoid turns ON(
1
), weight shaft rotates in the
direction indicated by arrow(
2
) and the weight plate contacts (
3
) the original.
The pressure is determined by the weight of the weight plate and tension of the
spring.
2) At the same time, the original stopper is moved below the paper guide(
4
).
Stopper shaft
Stopper shaft
Paper guide
Weight plate
SV038
Weight shaft
Original stopper
Click on the first or last page to see other FA-A888 service manuals if exist.