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
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 Troubleshooting Electrical Maintenance Structure Introduction

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/m2)
		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/m2
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%

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 guide
	Original feed	Original size
	cover
		indicator

Original feed tray

Original exit cover

SV027

1.4 Interior

Introduction

		Reverse motor
	CPU	Exit/Reverse
	Transfer belt	sensor
		Original exit cover
	motor
		open/close sensor
	Clock sensor
		Reverse solenoid
	Original feed
		Original size
	motor
	Registration	sensor
	sensor	Original size
	Timing sensor
		switch
	Original
	detecting sensor	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.)

Structure

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.

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.

11)When the original passes the timing sensor, pulse count to stop original feed by the 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	Structure
	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.

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)	Structure
	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.

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 not yet exited, it will switch from low gear to high speed without stopping.)

2-8

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	Maintenance interval			Remarks
		Cleaning		Replacement
	Original feed roller				Brush, waste, air
	PF2217P316A
					blower, isopropyl
				Every
	Original pick-up roller
					alcohol
				120,000
	PF2214P471A				NOTE: Minimum
				copies
	DFP roller
					quantity of
	PF2217K050A				isopropyl
	Registration roller				alcohol should
	PF2214P301A				be used and be
	Registration sensor				wiped
					immediately
	PF2214K224A
		Every			after its use.
	Timing sensor
	PF2214K224A	40,000		—
	Original reverse roller	copies
	PF2217P317A
	Original exit roller
	PF2214P323B
	Original exit/
	reverse sensor
	PF2214K222A
	Transport belt			Every
				120,000
	PF2214P353A
				copies

Maintenance

3-1

3.2 Disassembly and Assembly

(1) Cleaning

1	Clean the pick-up roller by rotating it.

Pick-up roller

SV001

SV001

2		1	Open the original feed cover and clean
			the parts below.
	5
	2	2	Original feed roller.
		3	Original double feed prevention roller
			(mounted on the feed cover).
	1	4	Registration rollers.
	3	5	Registration sensor.
	4	6	Reflection seal for the sensor (mounted
			on the feed cover).
	6
		SV002
		SV002
3		1	Open the ADF.
	2	2	Remove the screws (x 2).
	3	3	Open the registration roller guide.

4Clean the timing sensor and the reflection seal.

4

1

2

SV003

SV003

3-2

(1) Cleaning (continued)

4	Clean the original exit rollers.
	Original exit roller

		SV004
		SV004
	5	1 Open the original exit cover.
		2 Clean the reverse rollers.

	1	2	SV005
			SV005
6			1	Open the ADF.
	2		2	Remove the screws and star-washers
				(x 2).
			3	Remove the exit guide.
			4	Clean the reflection seal for the sensor.
			3	Clean the original exit sensor.
			5
	5		4
			Note: Check the condition of the guide mylar
				and replace as required.
	1
	2		SV006

SV006

Maintenance

3-3

(2) To replace the DFP roller

1			1	Open the original feed cover.
	2		2	Remove the screws (x 2).
			3	Remove the DFP roller unit.
		3	Note: This procedure is performed easier
	2			with the ADF down, or closed.
				Be careful to avoid damaging the guide
				mylar.
		1
		SV007	SV007
2		1	1	Remove the screws (x 2).
			2	Remove the DFP roller ass'y.
			Note: Be careful to avoid damaging the
				mylars.
		2
		SV008	SV008
3			1	Remove the springs (x 2).
			2	Remove the DFP roller (ass'y).
	DFP roller ass'y	1
			3	Remove the bearings (x 2).
			4	Remove the DFP roller.
		2	Note: (1) Note the position of the spring for
	1	3		use in re-assembly.
				(2) Do not lose the bearings.
				(3) Clean the roller after re-assembly.
		4		(4) Re-assemble in reverse order.
	3	SV009
			SV009

3-4

(3) Replacement of the transport belt

	1	1 Open the ADF to the service position.
		2 Remove the screws (with star-washers)
		on the upper frame (x 2).
	2	2
		Transfer belt
		SV010
	2	Remove the transport belt assembly.

Transfer belt assembly

	SV014	SV011
3		(x 2).
		Remove the screws (with star-washers)

		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.)
		3 Re-assemble in reverse order.
		2
		Note: Confirm that the drive belt is correctly
		SV015
		SV015	aligned on the belt drive pulley.

Maintenance

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.
2	1	Remove the screws (with star-washers)
		(x 3).
	2	Remove the bottom cover.

2 1

1	SV017

	3				1	Remove the original feed drive belt ass'y
						(2 screws).
	2		3		2	Open the original feed cover.
					3	Remove the screws (x 5).
		5			4	Slide the drive belt OFF of the drive motor
						pulley.
			4
	3				5	Lower the original feed unit onto the copier
						top left cover.
			3	SV018	6	Disconnect the four(4) connectors.
				SV018
	4		3		Turn the feed unit over and rest it on the
					original feed cover.
					1 Remove (or detach the harness from) four
	3					mini-clamps.
					2	Remove the screws (x 2).
					3	Loosen two screws.
			1	2	4	Rotate the pick-up roller so it is below the
		1	6
						tray guide.
		1
					5	Remove the original feed tray connector
	1	2	SV019SV019
						(2 screws) push the connector back
						through the hole.
					6	Remove the original feed tray guide.

3-6

(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			1	Remove the front touch ring.
			2	Remove the center touch ring.
2			3	Slide the pick-up roller toward the left.
4			4	Pull the pin out.
		5
3			5	Slide the pick-up roller toward the front
				and remove it.
		SV021
		SV021
7			1	Remove the touch rings on both sides.
			2	Slide the roller shaft toward the motor.
		3
1
		4	3	Pull the shaft up.
5
		2	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.
			Note: During re-installation, the roller should
		SV022		rotate freely counter-clockwise and
		SV022
				lock if turned clockwise.

Maintenance

3-7

(5) Exit assembly removal procedure

5

5

5

1Conduct the procedure 1 and 2 of page 3-5.

2Conduct the procedure 2 of page 3-6.

3Disconnect ADF CPU CN6 and CN7.

4Cover the platen glass with clean copier paper.

5Remove the exit ass'y mounting screws (x 5).

6Lower the exit ass'y onto the platen glass.

7Remove CN6 and CN7 harness from the LWS.

SV047

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 solenoid bracket

Screws

Flapper

~0.5mm	Maintenance
Flapper rubber
0
	Exit cover

SV035

Reverse solenoid

To perform this adjustment, the exit assembly must be removed.

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

Screw

Copier upper cover (Rear)

SV036

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

(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

1 2 3 4 5

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	Original stopper
feed roller	Original detecting sensor
	Original detecting sensor lever

Electrical

Regist roller	Pick up roller
	Timing sensor
	Regist roller sensor	SV037

( 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.

4-1