Panasonic FA-A888 Service manual
FA-A888 Back to Model List
Contents
WARNING
I. Introduction
1.1 Specifications.......................................................................................... 1-1
1.2 Features.................................................................................................. 1-2
1.3 Exterior ................................................................................................... 1-3
1.4 Interior..................................................................................................... 1-3
II. Sequence
2.1 Original paper feed system..................................................................... 2-1
2.2 Original paper exit system ...................................................................... 2-5
2.3 Original count system ............................................................................. 2-8
III. Maintenance
3.1 Maintenance chart .................................................................................. 3-1
3.2 Disassembly and Assembly.................................................................... 3-2
3.3 Adjustment.............................................................................................. 3-9
IV. Electrical
4.1 Function of electrical parts...................................................................... 4-1
4.2 Signal information by connectors............................................................ 4-9
4.3 Explanation of circuit............................................................................... 4-13
IntroductionStructureMaintenanceElectrical
Troubleshooting
V. Troubleshooting
5.1 Error detection by self-diagnosis ............................................................ 5-1
(1) User Error ........................................................................................ 5-1
(2) Paper jam......................................................................................... 5-2
(3) ADF function error............................................................................ 5-3
VI. Installation
6.1 Unpacking............................................................................................... 6-1
6.2 Installation procedure ............................................................................. 6-2
Installation
WARNING
This service information is designed for experienced repair technicians only and
is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of
potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced
professional technicians. Any attempt to service or repair the product or products
dealt with in this service information by anyone else could result serious injury or
death.
(For USA)
This manual was developed and is supplied to authorized servicing dealers by
Panasonic Communications & Systems Co. for the sole purpose of providing
information necessary for the equipment's proper support. It is intended that this
information be confidential and may not be reproduced without prior written consent
from Panasonic Communications & Systems Co. Panasonic Communications &
Systems Co. reserves the right to change any information enclosed herein without
prior notification.
This manual was developed and is supplied to authorized servicing dealers by
Panasonic Co. for the sole purpose of providing information necessary for the
equipment's proper support. It is intended that this information be confidential
and may not be reproduced without prior written consent from Panasonic Co.
Panasonic Co. reserves the right to change any information enclosed herein without
prior notification.
© February, 1999
Section I Introduction
1.1 Specification
1. For use with: FP-7718/7722/7728/7735/7742/7750
FP-D250/D350/D450/D600 Series
2. Original paper capacity: 50 sheets (20 lb/80 g/m
30 sheets (20 lb/80 g/m2) Ledger, Legal/A3, B4
3. Original size: Ledger to Invoice/A3 to A5
4. Original paper weight: 14 to 28 lb/50 to 110 g/m
5. Original feed speed: 55 sheets/min.
6. Power source: DC +24V (Supplied from copier)
7. Dimensions (W x H x D): 23.6" x 20.2" x 4.7"/600 x 518.5 x 120mm
(without tray)
8. Weight: 26.4 lb/12kg
9. Ambient conditions: Temperature 50°F to 86°F/10°C to 35°C
Relative humidity 20 to 85%
2
)
2
Introduction
1-1
1.2 Features
• Auto two-sided original feeding system
• When two-sided originals are loaded, the originals are automatically turned over
to copy both sides according to the copy mode selected at the copier.
• Function to count originals
• In auto two-sided copy mode, if the counted number of originals is an odd number,
the first copy will be a one-sided copy then the subsequent copies will be twosided.
• Original size feeding system
• Originals of different size but with the same width (Ledger/Letter, A3/A4) can
be combined for feeding.
• Realization of space saving
• Power unit is installed in the copier, so the former bump is removed.
• Capable of feeding originals up to Ledger/A3 size.
1-2
1.3 Exterior
Original feed
cover
1.4 Interior
Original guide
Original feed tray
Introduction
Original size
indicator
Original exit cover
SV027
Reverse motor
CPU
Transfer belt
motor
Clock sensor
Original feed
motor
Registration
sensor
Timing sensor
Original
detecting sensor
Exit/Reverse
sensor
Original exit cover
open/close sensor
Reverse solenoid
Original size
sensor
Original size
switch
Original feed cover
open/close switch
SV012
1-3
Section II Sequence
2.1 Original paper feed system
(1) The original is transported from the original feed tray to the original
registration roller.
Originals
SV028
1) When the wait/stopper solenoid is ON and the stopper and weight have
lowered, movement of the originals from the original feed tray becomes
possible.
2) After the original feed motor stops for 50msec (300msec to 1st paper) it starts
to rotate normally and transfers the original in the direction of the registration
roller.
3) The original arrives at the registration sensor within 2200msec for the JAM
timer (1) , when the pulse count reaches 100, the original feed motor stops.
(If the original is not detected by the registration sensor within 2200msec, a
paper jam will be indicated.)
4) After the original feed motor stops for 50msec, it starts to rotate in reverse
moving the original in the direction of the platen glass.
5) When the original feed motor reaches a predetermined count, it stops and
lead edge of the original is stopped approximately 42mm into the registration
roller.
Structure
2-1
(2) One-sided original feed
• This operation feeds the original from the original feed tray onto the platen glass.
(During this operation, if an original is already on the platen glass, that original
will exit.)
SV029
1) When an original is not on the original timing feed position, original timing
feed operation begins.
2) After 50msec, the transport belt motor begins to rotate normally. (At this time,
JAM timer (3) starts its count to 1225msec.)
3) After 105msec, the original feed motor reverse rotation commences. (At this
time, JAM timer (2) starts its count to 840msec.)
4) When the original arrives at the original exit/reverse sensor within 1225msec
for JAM timer(3), the count is started for JAM timer (5) to 1080msec and the
original reverse motor deceleration pulse.
5) When the count of the original reverse motor deceleration pulse is increased,
the original reverse motor switches from high gear to low gear.
6) When the original passes the original exit/reverse sensor within 1080msec for
JAM timer(5), the original exit motor stop pulse starts its count to 30.
7) When the original reverse motor stop pulse count increases, the original reverse
motor stops.
8) When the original passes the registration sensor within 840msec for JAM
timer(2), the original feed stop pulse of the transport belt motor starts the
count to 187.
9) At the same time, the original feed motor stops.
10) When the rotational pulse of the transport belt motor increases to a
predetermined pulse count, the transport belt motor stops.
11) After 50msec, the transport belt motor reverse rotation begins at a low speed.
12) When the rotational pulse of the transport belt motor increases to 63 pulse
count, the transport belt motor stops. (Only in switch back)
2-2
(3) Two-sided original feed
• This operation turns over the original at the reverse section then feeds it to the
platen glass. (During this operation, if an original is already on the platen glass,
that original will exit.)
SV030
1) When the original is not in the original timing feed position, the original timing
feed operation begins.
2) After 50msec, the original reverse and exit motor begins to rotate
simultaneously. (At this time, JAM timer (3) starts it count to 1225msec.)
3) After 100msec of the original feed motor reverse start timer, the original feed
motor reverse rotation begins. (At this time, JAM timer starts its count to
840msec, and JAM timer starts it count to 1585msec.)
4) When an original is on the platen glass, JAM timer(6) within 1585msec, and
the original timing feed position original JAM timer(3) within 1225msec have
arrived at the original exit/reverse sensor, and have passed the registration
sensor within 840msec of JAM timer(2), the original on the platen glass is
exited, and the original timing feed position original is reversed.
Structure
2-3
(4) 2 in 1 feed
• This operation feeds two originals in one pair from the original feed tray onto the
platen glass.
(During this operation, if an original is already on the platen glass, that original
will exit.)
7) ~ 12)
1) ~ 6)
SV033
1) When the original is not on the original timing feed position, the original timing
feed operation begins.
2) After the original timing feed operation, the transport motor begins to rotate
normally.
3) After 105msec, the original feed motor reverse rotation commences.
(At this time, JAM timer stopped by the timing sensor starts its count to
955msec.)
4) When the original passes the timing sensor within 955msec, the original feed
stop pulse of the transport belt motor starts its count to 103. And at the same
time the original feed motor stops.
5) When the rotational pulse of the transport motor increases to a predetermined
pulse count, the transport motor stops. (If an odd number, the original is not
flipped over.)
6) The original timing feed operation begins. (In an even number, the original is
fed.)
7) When the original of an even number arrives at the registration sensor, and
the count increases to 100, the original feed motor stops.
8) The original feed motor reverse rotation begins. <Start of 2 in 1 original feed >
9) After timing sensor is turned ON, the transport motor begins to rotate normally
by 7 pulses.
10) When the transport motor begins to rotate normally by, two originals in one
pair are transported to the platen glass.
When the original passes the timing sensor, pulse count to stop original feed by the
11)
transport belt motor starts to 135. At the same time the original feed motor stops.
12)
The rotational pulse of the transport motor reaches pre-fixed number, the
transport motor stops. (Completion of original set on the glass surface)
2-4
2.2 Original paper exit system
(1) Original Exiting
• This operation exits the originals. When a page with the lower page number of
original is not facing downward, the original will be turned over before being
exited. (The originals are always exited so that the page with lower page number
is on top.)
SV031
1) Only when the original is in the original timing feed position, one-sided original
feeding is done. The original on the platen glass is exited, and the original on
the timing feed position is moved to the platen glass. (When exiting both, the
original on the platen glass and the original on the timing feed position is
done, only when it is necessary is a reversal done.)
2) After completion of the transfer in 1) above, the reverse transport belt motor
begins to rotate normally. (At this time, JAM timer (3) starts its count to
1225msec.)
3) When the original arrives at the original exit/reverse sensor within 1225msec
of JAM timer (3), the original reverse motor begins the deceleration pulse
count. (At this time, JAM timer (5) starts its count to 1080msec.)
4) When the count of the original reverse motor deceleration pulse increases,
the original reverse motor switches from high gear to low gear.
5) When the original passes the original exit/reverse sensor within 1080msec of
JAM timer (5), the transport motor stops. Simultaneously, the original reverse
motor stop pulse begins its count to 307.
6) When the original reverse motor stop pulse increases to 307, the original
reverse motor stops.
Structure
2-5
(2) Original reverse feeding
• This operation takes the original on the platen glass turns it over then places it
on the platen glass.
SV032
1) After 50msec, the transport belt motor begins to rotate normally. At this time,
the original reverse solenoid is turned ON, and the original is now in a position
where it can be reversed.
2) Simultaneously, JAM timer (3) starts its count to 1225msec.
3) The original reverse motor starts.
4) When the original arrives at the original exit/reverse sensor within 1225msec
of JAM timer (3), both the transport belt motor and the reverse motor stop and
the rotational pulse of the original reverse motor is started to count.
5) After 50msec, the transport belt motor begins to rotate in reverse. And after
40msec, the original reverse motor starts. At this time JAM timer (4) begins
its count to 1000 msec.
6) When the original has passed the original exit/reverse sensor within 1000msec
of JAM timer (4), the rotational pulse that is counted is switched from the
original reverse motor to the transport belt motor.
7) When the rotational pulse of the transport belt motor is increased to 2476,
both the transport belt motor and the original reverse motor stop.
2-6
(3) 2 in 1 Original exit operation
1) ~ 6)
7) ~ 8)
SV034
1) The original reverse motor and the transport motor begin to rotate normally.
At this time, when the original does not arrive at the original reverse/exit sensor
within 1395msec of JAM timer, the original stop pulse of the transport motor
begins its count to 732.
2) When the original arrives at the reverse/exit sensor within 1395msec, the the
deceleration pulse of the original reverse motor begins to count.
At this time JAM timer stopped at the reverse/exit sensor begins its count to
2600msec.
3) When the original stop pulse of the transport motor increases its count, the
transport motor stops.
4) When the deceleration pulse of the original reverse motor increases, the
reverse motor is switched from high gear to low gear.
5) When the reverse/exit sensor is turned OFF, the timer delayed the second
original exit starts its count to 60msec.
6) When the delayed timer increases, the transport motor begins to rotate
normally.
7) When the original has passed the original reverse/exit sensor, the transport
motor stops. Simultaneously the original reverse motor stop pulse starts its
count to 424.
8) When the original reverse motor stop pulse is increased to 424, the reverse
motor stops.
Structure
2-7
2.3 Original count system
(1) Original count
• This operation counts the originals. It consists of 2 operations, one is the original
feed count, and the other is the original exit count, and each operates
simultaneously.
SV029
1) When the wait solenoid is turned ON, the stopper and the weight are moved
downward and the originals on the original feed tray can move.
2) After 100msec, the reverse motor stops.
3) After 30msec, the transport belt motor begins to rotate normally.
4) After 170msec, the original feed motor begins to rotate normally and the original
is moved in the direction of the registration roller. (At this time JAM timer (1)
starts to count to 220msec.)
5) When the original arrives at the registration sensor within 2200msec of JAM
timer (1) and 100 pulse count is started, the original feed motor stops. The
original waits until it is pressed against the registration roller.
6) After the original feed motor stops and 50msec has elapsed, the original feed
motor begins to rotate in reverse, and the original is moved in the direction of
the platen glass. (At this time, the counts of JAM timer (2) to 840msec and
JAM timer (7) to 1595msec are started.)
7)
When the original has passed the timing sensor within 840msec of JAM timer
(2), the original feed motor stops. (At this time, when an original is in the original
feed tray, and 50msec has elapsed, the original feed operation is repeated.)
8) When the original has passed the original exit/reverse sensor within 1080msec
of JAM timer (7), the count of the original reverse motor deceleration pulse is
started. (At this time, the count of JAM timer (5) starts to 1080msec.)
9) When the count of the original reverse motor deceleration pulse is increased,
the original reverse motor is switched from high to low speed.
10) When the original passes the original exit/reverse sensor within a
predetermined time of JAM timer (5), the transport belt motor stops and the
original reverse motor stop pulse starts to count to 307.
11) When the count of the original reverse motor stop pulse is increased to307,
the original reverse motor stops. (At this time, when all of the originals have
2-8
not yet exited, it will switch from low gear to high speed without stopping.)
Section III Maintenance
3.1 Maintenance chart
• In addition to the following maintenance table, the transport belt must be cleaned
as part of regular service calls.
• The timing of regular maintenance is determined on the basis of the number of
ADF original feed count.
Part name
Original feed roller
PF2217P316A
Original pick-up roller
PF2214P471A
DFP roller
PF2217K050A
Registration roller
PF2214P301A
Registration sensor
PF2214K224A
Timing sensor
PF2214K224A
Original reverse roller
PF2217P317A
Original exit roller
PF2214P323B
Original exit/
reverse sensor
PF2214K222A
Maintenance interval
Cleaning Replacement
Every
120,000
copies
Every
40,000
copies
—
Remarks
Brush, waste, air
blower, isopropyl
alcohol
NOTE: Minimum
quantity of
isopropyl
alcohol should
be used and be
wiped
immediately
after its use.
Maintenance
Transport belt
PF2214P353A
Every
120,000
copies
3-1
3.2 Disassembly and Assembly
(1) Cleaning
1
Pick-up roller
SV001
2
5
2
Clean the pick-up roller by rotating it.
SV001
1 Open the original feed cover and clean
the parts below.
2 Original feed roller.
3 Original double feed prevention roller
(mounted on the feed cover).
1
3
4
4 Registration rollers.
5 Registration sensor.
6 Reflection seal for the sensor (mounted
on the feed cover).
6
SV002
3-2
SV002
3
2
3
4
2
1
SV003
SV003
1 Open the ADF.
2 Remove the screws (x 2).
3 Open the registration roller guide.
4 Clean the timing sensor and the reflection
seal.
(1) Cleaning (continued)
4
Original exit roller
SV004
5
1
6
2
2
SV005
Clean the original exit rollers.
SV004
1 Open the original exit cover.
2 Clean the reverse rollers.
SV005
1 Open the ADF.
2 Remove the screws and star-washers
Maintenance
(x 2).
3 Remove the exit guide.
3
5
4
4 Clean the reflection seal for the sensor.
5 Clean the original exit sensor.
Note: Check the condition of the guide mylar
and replace as required.
1
2
SV006
SV006
3-3
(2) To replace the DFP roller
1
2
3
2
2
DFP roller ass'y
1
3
1
SV007
1
SV008
1
2
4
3
2
3
SV009
1 Open the original feed cover.
2 Remove the screws (x 2).
3 Remove the DFP roller unit.
Note: This procedure is performed easier
with the ADF down, or closed.
Be careful to avoid damaging the guide
mylar.
SV007
1 Remove the screws (x 2).
2 Remove the DFP roller ass'y.
Note: Be careful to avoid damaging the
mylars.
SV008
1 Remove the springs (x 2).
2 Remove the DFP roller (ass'y).
3 Remove the bearings (x 2).
4 Remove the DFP roller.
Note: (1) Note the position of the spring for
use in re-assembly.
(2) Do not lose the bearings.
(3) Clean the roller after re-assembly.
(4) Re-assemble in reverse order.
SV009
3-4
(3) Replacement of the transport belt
SV014
1
1 Open the ADF to the service position.
2 Remove the screws (with star-washers)
on the upper frame (x 2).
2
Transfer belt
2
3
Transfer belt
assembly
2
SV010
Remove the transport belt assembly.
Maintenance
SV011
Remove the screws (with star-washers)
(x 2).
SV014
4
1 Pull up the frame of the transport.
2 Remove the belt.
Note: During re-assembly, be careful to avoid
1
pinching the belt in the frame. (Belt
must be inside the frame flange.)
2
3 Re-assemble in reverse order.
Note: Confirm that the drive belt is correctly
SV015
SV015
aligned on the belt drive pulley.
3-5
(4) Replacement of the pick-up and the original feed rollers
1
1 Remove the original feed tray (2 screws,
1 connector).
2 Open the ADF to the service position.
1 Remove the screws (with star-washers)
2
(x 3).
2 Remove the bottom cover.
2
1
3
2
3
1
SV017
SV017
1 Remove the original feed drive belt ass'y
(2 screws).
2 Open the original feed cover.
3 Remove the screws (x 5).
5
4
3
4 Slide the drive belt OFF of the drive motor
pulley.
5 Lower the original feed unit onto the copier
top left cover.
3
SV018
SV018
6 Disconnect the four(4) connectors.
3-6
4
3
Turn the feed unit over and rest it on the
original feed cover.
1 Remove (or detach the harness from) four
3
1
2
6
1
1
1
2
SV019
SV019
mini-clamps.
2 Remove the screws (x 2).
3 Loosen two screws.
4 Rotate the pick-up roller so it is below the
tray guide.
5 Remove the original feed tray connector
(2 screws) push the connector back
through the hole.
6 Remove the original feed tray guide.
(4) Replacement of the pick-up and the original feed rollers (continued)
5
1 Remove the rear touch ring.
2 Slide the shaft of the pick-up roller toward
1
4
the motor.
3 Slide the bearing toward the left.
2
3 5
4 Pull the shaft upward.
5 Remove the bearing.
SV020
SV020
6
2
4
5
3
1 Remove the front touch ring.
2 Remove the center touch ring.
3 Slide the pick-up roller toward the left.
4 Pull the pin out.
5 Slide the pick-up roller toward the front
and remove it.
Maintenance
SV021
SV021
7
1
5
3
4
2
1 Remove the touch rings on both sides.
2 Slide the roller shaft toward the motor.
3 Pull the shaft up.
4 Remove the bearing on the front side.
5 Remove the touch ring.
6 Slide the original feed roller to the front
6
4
side and remove it.
SV022
SV022
Note: During re-installation, the roller should
rotate freely counter-clockwise and
lock if turned clockwise.
3-7
(5) Exit assembly removal procedure
5
5
5
SV047
1 Conduct the procedure 1 and 2 of page
3-5.
2 Conduct the procedure 2 of page 3-6.
3 Disconnect ADF CPU CN6 and CN7.
4 Cover the platen glass with clean copier paper.
5
Remove the exit ass'y mounting screws (x 5).
6 Lower the exit ass'y onto the platen glass.
7 Remove CN6 and CN7 harness from the LWS.
3-8
3.3 Adjustment
(1) Switching original exit
• With the solenoid screws loose, manually engage the plunger into the solenoid.
While holding the plunger engaged, slide the solenoid side to side to obtain a
0 - 5mm gap between the flapper and flapper rubber.
Flapper
Flapper rubber
Flapper
solenoid
bracket
Screws
SV035
Reverse
solenoid
To perform this adjustment, the exit assembly must be removed.
Maintenance
0 ~0.5mm
Exit cover
3-9
(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.
ADF open/close
switch
Switch lever
Copier upper
cover (Rear)
Screw
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.
3-10
SV036
(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).
Service cover
SV043
SV043
3) Set the ADF CPU PCB dip switches as follows:
ON
OFF
12345
4) Turn the copier power switch ON. The LED of ADF CPU PCB will flash.
(This is normal before pressing PSW1.)
5) The sensor adjustment and E2PROM initialization will be automatically
performed when the push switch (PSW1) is pressed on the ADF CPU PCB.
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.
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.
Maintenance
3-11
Section IV 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.
Original
feed roller
Regist roller
( Registration roller sensor )
•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 stopper
Original detecting sensor
Original detecting sensor lever
Pick up roller
Timing sensor
Regist roller sensor
SV037
Electrical
4-1
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