Canon Pixma MX850 Service Manual. Parts Catalog

MX850

Service Manual

Revision 0

QY8-13BR-000

COPYRIGHTc2008 CANON INC. CANON MX850 012008 XX 0.00-0

Scope

This manual has been issued by Canon Inc., to provide the service technicians of this product with the information necessary for qualified persons to learn technical theory, installation, maintenance, and repair of products. The manual covers information applicable in all regions where the product is sold. For this reason, it may contain information that is not applicable to your region.

This manual does not provide sufficient information for disassembly and reassembly procedures. Refer to the graphics in the separate Parts Catalog.

Revision

This manual could include technical inaccuracies or typographical errors due to improvements or changes made to the product. When changes are made to the contents of the manual, Canon will release technical information when necessary. When substantial changes are made to the contents of the manual, Canon will issue a revised edition.

The following do not apply if they do not conform to the laws and regulations of the region where the manual or product is used:

Trademarks

Product and brand names appearing in this manual are registered trademarks or trademarks of the respective holders.

Copyright

All rights reserved. No parts of this manual may be reproduced in any form or by any means or translated into another language without the written permission of Canon Inc., except in the case of internal business use.

Copyright © 2008 by Canon Inc. CANON INC.

Inkjet Device Quality Assurance Div. 1

451, Tsukagoshi 3-chome, Saiwai-ku, Kawasaki-shi, Kanagawa 212-8530, Japan

MX850

TABLE OF CONTENTS

1. MAINTENANCE

1-1. Adjustment, Periodic Maintenance, Periodic Replacement Parts, and Replacement Consumables by Service Engineer

1-2. Customer Maintenance

1-3. Special Tools

1-4. Serial Number Location

2. LIST OF ERROR DISPLAY / INDICATION

2-1. Operator Call Errors

2-2. Service Call Errors

2-3. Fax Errors

2-4. Other Error Messages

2-5. Warnings

2-6. Troubleshooting by Symptom

3. REPAIR

3-1. Notes on Service Part Replacement

3-2. Special Notes on Repair Servicing

(1)External housing, ADF, and scanner unit removal

(2)Printer unit separation from the bottom case (how to remove the screw under the purge unit)

(3)Operation panel removal

(4)AC adapter attachment

(5)Emblem removal

(6)Cable wiring and connection

3-3. Adjustment / Settings

(1)Paper feed motor adjustment

(2)Document pressure sheet (sponge sheet) replacement

(3)Grease application

(4)Ink absorber counter setting

(5)User mode

(6)Service mode

A:Service mode operation

B:Destination settings

C:Ink absorber counter resetting

D:Ink absorber counter setting

E:LF / Eject correction

F:Button and LCD test

(7)PTT parameter mode

A:PTT parameter mode operation

B:#1 BIT SWITCH

C:#2 NUMERIC PARAM

D:Confirmation of the setting values

3-4. Verification Items

(1)Service test print

(2)Ink absorber counter value print

4.MACHINE TRANSPORTATION

<TABLE OF CONTENTS>

MX850	TABLE OF CONTENTS

1. MAINTENANCE

1-1. Adjustment, Periodic Maintenance, Periodic Replacement Parts, and Replacement Consumables by Service Engineer

(1) Adjustment

		Adjustment		Timing		Purpose		Tool		Approx.
										time
		EEPROM		- At logic board replacement		To initialize settings		None.		1 min.
		initialization						Perform in the service
								mode.
		Destination		- At logic board replacement		To set destination.		None.		1 min.
		settings (EEPROM						Perform in the service
		settings)						mode.
		Ink absorber		- At logic board replacement		To reset the ink absorber		None.		1 min.
		counter resetting		- At ink absorber replacement		counter.		Perform in the service
		(EEPROM						mode.
		settings)
		Ink absorber		- At logic board replacement		To set the ink amount data in		None.		1 min.
		counter value				the ink absorber to the ink		Perform in the service
		setting				absorber counter.		mode.
		(EEPROM
		settings)
		Ink absorber		- When the ink absorber		To replace the ink absorber with		Screwdriver, a pair of		20 min.
		replacement		becomes full		a new one.		tweezers, etc.
		Paper feed motor		- At paper feed motor		To adjust the belt tension.		None.		5 min.
		position		replacement		(Position the paper feed motor
		adjustment				so that the belt is stretched
						tight.)
		CD / DVD		- At carriage unit replacement		To correct the light volume for		None.		5 min.
		detection sensor		- At logic board replacement		the CD / DVD detection sensor.		Perform in the service
		light volume						mode.
		correction*1

Automatic print	- At print head replacement
head alignment	- At logic board replacement
	- When print quality is not
	satisfying

To secure the dot placement	None.	10 min.
accuracy.	Perform in the user	(Use MP-
	mode.	101.)

Manual print head	- At print head replacement
alignment	- At logic board replacement
	- When print quality is not
	satisfying

To secure the dot placement	None.	13 min.
accuracy.	Perform in the user
	mode.

Grease application	- At carriage unit replacement	To maintain sliding properties	FLOIL KG-107A	1 min.
	- At lift cam replacement	of the following items:
	- To gears	- Carriage shaft
	- At Easy-Scroll Wheel	- Lift cam bushing
	replacement	- Machine sliding portions
		(gears)
		- Wheel base
Ink system	- At logic board replacement	To maintain detection	None.	1 min.
function check	- At spur base replacement	functionality for presence of the	Perform in the service
	- At carriage unit replacement	ink tanks and each ink tank	mode.
		position.
LCD language	- At logic board replacement	To set the language to be	None.	1 min.
		1 / 45

settings		displayed on the LCD.	Perform in the user
			mode.
Platen glass	- At protection sheet	To maintain scanning accuracy,	None.	1 min.
protection sheet	replacement	hold the sheet with the long side
(document	- At document feed base	down, then fit its upper left
pressure sheet)	replacement	corner to the platen glass
position		reference mark (back left).
adjustment
LF / Eject	- At logic board replacement	To correct line feeding (LF	None.	5 min.
correction	- At feed roller ass'y	roller diameter).	Perform in the service	(LF
	replacement		mode.	correction
				and Eject
	- At logic board replacement	To correct line feeding (eject	None.	correction
				is
	- At platen unit replacement	roller diameter).	Perform in the service
				performed
			mode.
				at the same
				time.)

*1: Only for CD / DVD printing supported regions.

-DO NOT loosen the red screws at both ends of the carriage shaft, securing the print head position, as they are not re-adjustable.

-The red screws securing the paper feed motor may be loosened only at replacement of the paper feed motor unit.

-For the automatic print head alignment, use Matte Photo Paper (MP-101), which is packed with the machine before shipment. If Matte Photo Paper (MP-101) is not available, perform manual print head alignment using plain paper.

(2)Periodic maintenance

No periodic maintenance is necessary.

(3) Periodic replacement parts

There are no parts in this machine that require periodic replacement by a service engineer.

(4) Replacement consumables

There are no consumables that require replacement by a service engineer.

1-2. Customer Maintenance

Adjustment		Timing		Purpose		Tool		Approx.
								time
Automatic print		- At print head replacement		To ensure accurate		- Machine		10min. (Use
head alignment		- When print quality is not satisfying (uneven		dot placement.		buttons		MP-101.)
		printing, etc.)				- Matte Photo
						Paper (MP-
					101)
						- Computer (MP
						driver)
Manual print head		- At print head replacement		To ensure accurate		- Machine		13 min.
alignment		- When print quality is not satisfying (uneven		dot placement.		buttons
		printing, etc.)				- Computer (MP
						driver)
Print head		When print quality is not satisfying.		To improve nozzle		- Machine		1 min.
cleaning				conditions.		buttons
						- Computer (MP
	2 / 45

			driver)
Print head deep	When print quality is not satisfying, and not	To improve nozzle	- Machine	2 min.
cleaning	improved by print head cleaning.	conditions.	buttons
			- Computer (MP
			driver)
Ink tank	When an ink tank becomes empty. ("No ink error"	To replace the empty	---	1 min.
replacement	displayed on the monitor or on the machine LCD,	ink tank.
	or short flashing of an ink tank LED)

Paper feed roller	- When paper does not feed properly.
cleaning	- When the front side of the paper is smeared.

To clean the paper	- Machine	2 min.
feed rollers of the	buttons
rear tray.	- Computer (MP
	driver)

Rear tray sub-	When the paper fed from the rear tray is smeared	To clean the rear tray	- Machine	1 min.
roller cleaning	due to ink mist attached to the rear tray sub-rollers.	sub-rollers.	buttons
Bottom plate	When the back side of the paper is smeared.	To clean the platen	- Machine	1 min.
cleaning		ribs.	buttons
			- Computer (MP
			driver)
Scanning area	When the platen glass or document pressure sheet	To clean the platen	Soft, dry, and	1 min.
cleaning	is dirty.	glass and pressure	clean lint-free
		sheet.	cloth.
Exterior cleaning	When necessary	To clean the machine	Soft, dry, and	1 min.
		exterior	clean lint-free
			cloth.

1-3. Special Tools

Name		Tool No.		Application		Remarks
FLOIL KG-107A		QY9-0057-000		To the carriage shaft sliding portions and lift cam bushing.		In common with the MP600, etc.

1-4. Serial Number Location

On the carriage flexible cable holder (visible on the right of the carriage after the machine is turned on, the scanning unit is opened, and the carriage stops at the ink tank replacement position)

<1. MAINTENANCE>

3 / 45

MX850	TABLE OF CONTENTS

2. LIST OF ERROR DISPLAY / INDICATION

Errors and warnings are displayed by the following ways:

1.Operator call errors are indicated by the Alarm LED lit in orange, and the error and its solution are displayed on the LCD in text and by icon.

2.Messages during printing from a computer are displayed on the MP driver Status Monitor.

3.Error codes are printed in the "operator call/service call error record" area in EEPROM information print

Buttons valid when an operator call error occurs:

1.ON/OFF button: To turn the machine off and on again.

2.OK button: To clear and recover from an error. In some operator call errors, the error will automatically be cleared when the cause of the error is eliminated, and pressing the OK button may not be necessary.

3.Stop/Reset button: To cancel the job at error occurrence, and to clear the error.

2-1. Operator Call Errors (by Alarm LED Lit in Orange)

Error

No paper in the rear tray.

No CD / DVD tray*1.

No CD or DVD*1.

Error

code

[1000]

[1001]

[1002]

U No.	Message on the LCD

---Rear tray.

There is no paper. Load paper and press [OK].

---There is no CD-R tray. Attach the tray and press [OK].

---Printable disc is not set. Correctly place a disc in the CD-R tray and press [OK].

No paper in the cassette. [1003]		---	Cassette.
			There is no paper. Load paper and
			press [OK].
Paper jam.	[1300]	---	The paper is jammed. Clear the
Paper jam in the rear	[1303]	---	paper and press [OK].
guide.
Paper jam in the under	[1304]	---
guide.
Ink may have run out.	[1600]	U041	The ink may have run out.
			Replacing the ink tank is
			recommended.
Ink tank not installed.	[1660]	U043	The following ink tank cannot be
			recognized.
			(Applicable ink tank icon)

Solution

Confirm that the rear tray is selected as the paper source. Set the paper in the rear tray, and press the OK button.

Set the CD / DVD tray, and press the OK button.

Set a CD or DVD in the CD / DVD tray, and inset the CD / DVD tray in the proper position. Then, press the OK button.

Confirm that the cassette is selected as the paper source. Set the paper in the cassette, and press the OK button.

Remove the jammed paper, and press the OK button.

Replace the applicable ink tank, or press the OK button to clear the error without ink tank replacement. When the error is cleared by pressing the OK button, ink may run out during printing.

Install the applicable ink tank(s) properly, and confirm that the LED's of all the ink tanks light red.

Print head not installed, [1401]	U051 Print head is not installed. Install the Install the print head properly.
or not properly	print head.
installed.

Print head temperature	[1403]	U052 The type of print head is incorrect.
sensor error.		Install the correct print head.
Faulty EEPROM data	[1405]
of the print head.

Re-set the print head. If the error is not cleared, the print head may be defective. Replace the print head.

Inner cover error.	[1841*2,	---	Inner cover is open. Close the inner	Close the inner cover, and press the OK button.
	1846*2,		cover and press [OK].
	1851*1,
	1856*1]
	[1850*1,	---	Open the inner cover, place the CD-	Open the inner cover which functions as the CD /
	1855*1]		R tray and press [OK].	DVD tray feeder, set the CD / DVD tray in the
			4 / 45

				feeder, and press the OK button.
Multiple ink tanks of	[1681]	U071	More than one ink tank of the	Replace the wrong ink tank(s) with the correct one
the same color installed.			following color is installed.	(s).
Ink tank in a wrong	[1680]	U072	Some ink tanks are not installed in	Install the ink tank(s) in the correct position.
position.			place.
Warning: The ink	[1700,	---	Contact the support center or	Replace the ink absorber, and reset its counter. [See
absorber becomes	1701]		service center for ink absorber	3-3. Adjustment / Settings, (6) Service mode.]
almost full.			replacement. Press [OK] to continue	Pressing the OK button will exit the error, and
			printing.	enable printing without replacing the ink absorber.
				However, when the ink absorber becomes full, no

further printing can be performed unless the applicable ink absorber is replaced.

The connected digital	[2001]	--- The device may be incompatible.
camera or digital video		Remove the device and check the
camera does not support		manual supplied with the connected
Camera Direct Printing.		device.
Automatic duplex	[1310]	--- This paper is not compatible with
printing cannot be		duplex printing. Remove the paper
performed.		and press [OK].

Remove the cable between the camera and the machine.

The paper length is not supported for duplex printing.

Press the OK button to eject the paper being used at error occurrence.

Data which was to be printed on the back side of paper at error occurrence is skipped (not printed).

Failed in automatic	[2500]	---	Auto head align has failed. Press
print head alignment.			[OK] and repeat
			operation. <See manual>
The remaining ink	[1683]	U130	(Applicable ink tank icon)
amount unknown.			The remaining level of the ink
			cannot be correctly detected.

Ink tank not recognized. [1684]		U140	The following ink tank cannot be
			recognized.
			(Applicable ink tank icon)
Ink tank not recognized.	[1410	U150	The following ink tank cannot be
	to		recognized.
	1419]		(Applicable ink tank icon)
No ink (no raw ink).	[1688]	U163	The ink has run out. Replace the ink
			tank.
			(Applicable ink tank icon)

Non-supported hub	[2002] --- An unsupported USB hub is
	connected. Remove the hub.

Press the OK button to clear the error, then perform the automatic print head again.

(In the MX850, use Matte Photo Paper MP-101.)

An ink tank which has once been empty is installed. Replace the applicable ink tank with a new one. Printing with a once-empty ink tank can damage the machine.

To continue printing without replacing the ink tank (s), press the Stop/Reset button for 5 sec. or longer to disable the function to detect the remaining ink amount. After the operation, it is recorded in the machine EEPROM that the function to detect the remaining ink amount was disabled.

A non-supported ink tank is installed (the ink tank LED is turned off). Install the supported ink tanks.

A hardware error occurred in an ink tank (the ink tank LED is turned off). Replace the ink tank(s).

Replace the empty ink tank(s), and close the scanning unit (printer cover).

Printing with an empty ink tank can damage the machine.

To continue printing without replacing the ink tank (s), press the Stop/Reset button for 5 sec. or longer to disable the function to detect the remaining ink amount. After the operation, it is recorded in the machine that the function to detect the remaining ink amount was disabled.

Remove the applicable USB hub from the PictBridge (USB) connector.

*1: Only for models supporting CD / DVD printing *2: Only for models not supporting CD / DVD printing

5 / 45

2-2. Service Call Errors (by Cyclic Blinking of Alarm and Power LEDs)

Service call errors are indicated by the number of cycles the Alarm and Power LEDs blink, and the corresponding error code is displayed on the LCD.

Cycles of
blinking of		Error
Alarm and
Power LEDs
2 times		Carriage error

Error		Conditions
code

[5100] An error occurred in the carriage encoder signal.

Solution (Replacement of listed parts, which are likely to be faulty)

-Carriage unit

-Timing slit film

-Logic board

-Carriage motor

3 times	Line feed error	[6000]	An error occurred in the LF encoder	- Timing sensor unit
			signal.	- Timing slit disk film
				- Feed roller
				- Logic board
				- Paper feed motor
4 times	Purge cam sensor error	[5C00]	An error occurred in the purge unit.	- Purge unit
				- Logic board
5 times	ASF (cam) sensor error	[5700]	This error takes place when paper feeds	- Sheet feed unit
			from the rear tray after an error	- ASF_PE sensor board
			occurred in the ASF cam sensor.	- Logic board
6 times	Internal temperature	[5400]	The internal temperature is not normal.	- Logic board
	error
7 times	Ink absorber full	[5B00,	The ink absorber is supposed to be full.	- Ink absorber kit
		5B01]	Message on the LCD:
			Ink absorber full. Service required.
			Error codes:
			5B00: Main ink absorber is full
			(overseas).
			5B01: Main ink absorber is full
			(Japan).
8 times	Print head temperature	[5200]	The print head temperature exceeded the	- Print head
	rise error		specified value.	- Logic board
9 times	EEPROM error	[6800,	A problem occurred in reading from or	- Logic board
		6801]	writing to the EEPROM.
			Error codes:
			6800: Read error
			6801: Write error
10 times	VH monitor error	[B200]	The internal temperature exceeded the	- Print head
			specified value.	- Carriage unit
				- Logic board
11 times	Carriage lift mechanism	[5110]	The carriage did not move up or down	- Sheet feed unit
	error		properly.	- PR lift shaft ass'y
				- Carriage lift sensor unit
				- Logic board
12 times	AP position error	[6A00]	An error occurred in the AP motor	- Sheet feed unit
			during purging operation.	- Purge unit
				- Logic board
13 times	Paper feed position error	[6B00]	An error occurred in the paper feed	- Sheet feed unit
			motor during line feeding.	- Logic board
14 times	Paper feed cam sensor	[6B10]	An error occurred in the paper feed cam	- Sheet feed unit
	error		sensor during paper feeding from the	- Logic board
			cassette.
			6 / 45

15 times	USB Host VBUS	[9000]	The USB Host VBUS is overloaded.	- Logic board
	overcurrent
16 times	Pump roller sensor error	[5C20]	The pump roller position cannot be	- Purge unit
			detected.	- Logic board
17 times	Paper eject encoder error	[6010]	An error occurred in the paper eject	- Platen unit
			encoder signal.	- Timing sensor unit
				- Timing slit disk eject film
				- Paper feed motor
				- Logic board
19 times	Ink tank position sensor	[6502]	None of the ink tank position is detected. - Platen unit
	error			- Logic board
22 times	Scanner home position	[5010]	The scanner unit cannot detect the home	- Scanner unit
	error		position, or the scanner unit warming-up
			is not performed properly at power-on.
			On the LCD, "Scanner is not operating
			correctly." is displayed.
Power LED	ROM / RAM error	---	The check sum value is incorrect in the	- Logic board
turned off, and			ROM check or RAM check at hard-
Alarm LED lit			power-on.

Before replacement of the logic board ass'y, check the ink absorber counter value (by service test print or EEPROM information print). If the counter value is 7% or more, also replace the ink absorber kit when replacing the logic board ass'y. If the counter value is less than 7%, register the current ink absorber counter value to the replaced new logic board instead.

[See 3-3. Adjustment / Settings, (6) Service mode, for details.]

2-3. Fax Errors

For errors other than those listed below, please refer to the "G3 / G4 Facsimile Error Code List (Rev. 2)."

(1) User error codes

Error code		TX / RX		Meaning
#001		TX		Document jam
#003		TX / RX		Document is too long, or page time-over
#005		TX / RX		Initial identification (T0 / T1) time-over
#009		RX		Recording paper jam, or no recording paper
#012		TX		No recording paper at the receiving machine
#017		TX		Redial time-over, but no DT detected
#018		TX		Auto dialing transmission error, or redial time-over
#022		TX		Call failed (no dial registration)
#037		RX		Memory overflow at reception of an image
#085		TX		No color fax function supported in the receiving machine
#099		TX / RX		Transmission terminated mid-way by pressing the Stop/Reset button
#995		TX / RX		During TX (sending): Memory transmission reservation cancelled
				During RX (receiving): Image data received in the memory cleared

(2) Service error codes

Error code		TX / RX		Meaning
##100		TX		Re-transmission of the procedure signal has been attempted the specified number of times, but failed.
##101		TX / RX		Sender's modem speed does not match the receiving machine.
			7 / 45

##102	TX	Fallback is not available.
##103	RX	EOL has not been detected for 5 seconds (or 15 seconds in CBT).
##104	TX	RTN or PIN has been received.
##106	RX	The procedure signal has been expected for 6 seconds, but not received.
##107	RX	Fallback is not available at the sending machine.
##109	TX	After DCS transmission, a signal other than DIS, DTC, FTT, CFR, or CRP has been received, and re-
		transmission of the procedure signal has been attempted the specified number of times but failed.
##111	TX / RX	Memory error
##114	RX	RTN has been received.
##200	RX	A carrier has not been detected for 5 seconds during image reception.
##201	TX / RX	DCN has been received in a method other than the binary procedure.
##204	TX	DTC has been received even when there is no sending data.
##220	TX / RX	System error (main program hang-up)
##224	TX / RX	An error has occurred in the procedure signal in G3 transmission.
##226	TX / RX	The stack pointer has shifted from the RAM area.
##229	RX	The recording area has been locked for 1 minute.
##232	TX	The encoder control unit has malfunctioned.
##237	RX	The decoder control unit has malfunctioned.
##238	RX	The print control unit has malfunctioned.
##261	TX / RX	A system error has occurred between the modem and the system control board.
##280	TX	Re-transmission of the procedure signal has been attempted the specified number of times, but failed.
##281	TX	Re-transmission of the procedure signal has been attempted the specified number of times, but failed.
##282	TX	Re-transmission of the procedure signal has been attempted the specified number of times, but failed.
##283	TX	Re-transmission of the procedure signal has been attempted the specified number of times, but failed.
##284	TX	After TCF transmission, DCN has been received.
##285	TX	After EOP transmission, DCN has been received.
##286	TX	After EOM transmission, DCN has been received.
##287	TX	After MPS transmission, DCN has been received.
##288	TX	After EOP transmission, a signal other than PIN, PIP, MCF, RTP, RTN has been received.
##289	TX	After EOM transmission, a signal other than PIN, PIP, MCF, RTP, RTN has been received.
##290	TX	After MPS transmission, a signal other than PIN, PIP, MCF, RTP, RTN has been received.
##670	TX	In V.8 late start, the DIS V.8 ability from the receiving machine was detected, and CI was sent in
		response; however, the procedure failed, causing T1 time-over.
##671	RX	In V.8 call reception, the procedure fails to proceed to phase 2 after CM detection, causing T1 time-over.
##672	TX	In V.34 transmission, the procedure fails to proceed from phase 2 to phase 3 or later, causing T1 time-
		over
##673	RX	In V.34 reception, the procedure fails to proceed from phase 2 to phase 3 or later, causing T1 time-over
##674	TX	In V.34 transmission, the procedure fails to proceed from phase 3 or 4 to the control channel or later,
		causing T1 time-over
##675	RX	In V.34 reception, the procedure fails to proceed from phase 3 or 4 to the control channel or further,
		causing T1 time-over
##750	TX	After transmitting PPS-NULL in ECM transmission, no significant signal has been received, and re-
		transmission of the procedure signal has been attempted the number of specified times but failed.
##752	TX	After transmitting PPS-NULL in ECM transmission, DCN has been received.
		8 / 45

##753	TX	After transmitting PPS-NULL in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.
##754	TX	After transmitting PPS-NULL in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed.
##755	TX	After transmitting PPS-MPS in ECM transmission, no significant signal has been received, and re-
		transmission of the procedure signal has been attempted the number of specified times but failed.
##757	TX	After transmitting PPS-MPS in ECM transmission, DCN has been received.
##758	TX	After transmitting PPS-MPS in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.
##759	TX	After transmitting PPS-MPS in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed.
##760	TX	After transmitting PPS-EOM in ECM transmission, no significant signal has been received, and re-
		transmission of the procedure signal has been attempted the number of specified times but failed.
##762	TX	After transmitting PPS-EOM in ECM transmission, DCN has been received.
##763	TX	After transmitting PPS-EOM in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.
##764	TX	After transmitting PPS-EOM in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed.
##765	TX	After transmitting PPS-EOP in ECM transmission, no significant signal has been received, and re-
		transmission of the procedure signal has been attempted the number of specified times but failed.
##767	TX	After transmitting PPS-EOP in ECM transmission, DCN has been received.
##768	TX	After transmitting PPS-EOP in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.
##769	TX	After transmitting PPS-EOP in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed.
##770	TX	After transmitting EOR-NULL in ECM transmission, no significant signal has been received, and re-
		transmission of the procedure signal has been attempted the number of specified times but failed.
##772	TX	After transmitting EOR-NULL in ECM transmission, DCN has been received.
##773	TX	After transmitting EOR-NULL in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.
##774	TX	After transmitting EOR-NULL in ECM transmission, ERR has been received.
##775	TX	After transmitting EOR-MPS in ECM transmission, no significant signal has been received, and re-
		transmission of the procedure signal has been attempted the number of specified times but failed.
##777	TX	After transmitting EOR-MPS in ECM transmission, DCN has been received.
##778	TX	After transmitting EOR-MPS in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.
##779	TX	After transmitting EOR-MPS in ECM transmission, ERR has been received.
##780	TX	After transmitting EOR-EOM in ECM transmission, no significant signal has been received, and re-
		transmission of the procedure signal has been attempted the number of specified times but failed.
##782	TX	After transmitting EOR-EOM in ECM transmission, DCN has been received.
##783	TX	After transmitting EOR-EOM in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.
##784	TX	After transmitting EOR-EOM in ECM transmission, ERR has been received.
##785	TX	After transmitting EOR-EOP in ECM transmission, no significant signal has been received, and re-
		transmission of the procedure signal has been attempted the number of specified times but failed.
##787	TX	After transmitting EOR-EOP in ECM transmission, DCN has been received.
##788	TX	After transmitting EOR-EOP in ECM transmission, re-transmission of the procedure signal has been
		attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.
		9 / 45

##789	TX	After transmitting EOR-EOP in ECM transmission, ERR has been received.
##790	RX	After receiving EOR-EOP in ECM reception, ERR has been transmitted.
##791	TX / RX	During the ECM mode procedure, a signal other than a significant one has been received.
##792	RX	In ECM reception, PPS-NULL between partial pages has not been detected.
##793	RX	During high-speed signal reception in ECM, no effective frame has been detected, and a time-over has
		occurred.

2-4. Other Error Messages

Message on the LCD

The selected paper cannot be fed from cassette. Change the paper source and press [OK].

Cannot specify the followings together. Change one of the settings.

Device memory is full. Reduce the amount of photos, films, copies to scan.

Press <>.

(<>: Color button icon)

Press <>.

(<>: Black button icon)

There is no photo data.

The value exceeds the number of copies you can print.

Cause		Solution
The paper type being used (business card,		Change the paper source to the rear tray.
Credit Card size paper, or stickers, etc.) is
not supported for paper feeding from the
cassette.

Settings made conflict each other. (e.g. Selecting borderless printing on plain paper)

The memory is not sufficient to perform the print job in copying.

The Black button was pressed, but it is invalid.

The Color button was pressed, but it is invalid.

Supported image files are not in the memory card.

Change the settings so that they will not conflict each other.

Reduce the amount of data to be printed, or print from a computer.

A temporary error. Press the Color button to continue the operation.

A temporary error. Press the Black button to continue the operation.

A temporary error.

-Confirm that supported image files are in the memory card.

-Images with double-byte characters used in the file name (or folder name) may not be recognized. Change the file (or folder) name so that it contains only single-byte alphanumeric characters.

-If images are edited on the computer, print them from the computer.

During selecting images or specifying the	A temporary error. The last operation before
number of copies, the total print quantity	the error is cancelled, and the total print
exceeds the prescribed value of 999.	quantity returns to the value before the
	error.

Memory card is not set. Insert the card after checking the direction.

DPOF information is not saved.

This layout is available only for A4 or 8.5"x11"(LTR).

The memory card is not inserted in the slot properly.

DPOF print was selected in the menu, but no DPOF files are contained in the memory card.

In Layout print, "Mixed 1, 2, or 3" which is available only with A4 or Letter size paper is selected, but the paper size is not set to A4 or Letter.

Set a memory card.

A temporary error. The LCD automatically returns to the display before the error occurrence.

A temporary error. The LCD automatically returns to the display before the error occurrence.

Change the setting after removing the card.

The card is currently write-enabled. Remove card and set to read-only mode before performing operation.

With a memory card inserted in the slot, change of the Read/Write attribute was attempted.

With the memory card set to the Read/write mode, Card Direct printing operation was attempted from the menu.

10 / 45

A temporary error. Remove the memory card, then change the Read/Write attribute.

A temporary error. Remove the memory card, change the memory card setting to Read-only, then perform Card Direct

The paper size is not correct. Check the page size you have set.

Non-supported size of paper for Camera Direct printing via PictBridge connection is selected.

printing.

Cancel printing on the digital camera. Confirm the paper size, and print again.

Failed to scan Photo Index Sheet. Check orientation/position and check that platen/sheet is clean. <See manual>

The machine failed in scanning the Photo Index Sheet.

Press the OK button to clear the error. Confirm the following, then try again:

-Clean the platen glass, and confirm that the Photo Index Sheet is not smeared.

-Place the sheet in the correct orientation and position.

Failed to scan Photo Index Sheet. Check that all items are marked correctly. <See manual>

The machine scanned the Photo Index Sheet, but markings in the sheet were incorrect.

Press the OK button to clear the error. Confirm the following, then try again:

-Fill in all the circles on the Photo Index Sheet properly.

-Place the sheet in the correct orientation and position.

Failed to scan. Either document	The machine failed in scanning the
cannot be scanned or is not placed on	document for Fit-to-page copy.
the platen glass.
Cover is open. Close cover.	The cover was opened during printing.

Press the OK button to clear the error. Correct the settings, then try the operation again.

Close the cover. The LCD returns to the display before the error occurrence.

Scanner is not operating correctly.

The CIS cannot detect the home position, or the scanner unit warming-up is not performed properly at power-on.

Press the OK button to clear the error, and turn the machine off and on again. If the error still occurs, repair servicing is required.

Document in ADF. Redo operation	The document is left in the ADF.
after checking document in ADF and
pressing [OK].

Document size is too long. Redo operation after checking document on ADF and pressing [OK].

Document size not suitable for twosided scanning. Press [OK] to cancel operation and discharge document.

The document is too long (longer than the Legal size length) for the ADF, or the document jams in the ADF.

The paper size is not supported for scanning on both sides of paper. (Only the A4 and Letter sizes are supported.)

Remove the document from the ADF, press the OK button to clear the error, then try the operation again.

Remove the document from the ADF, and press the OK button to clear the error. Confirm that the document size is supported, then try the operation again.

Press the OK button to clear the error. Perform scanning each side of paper separately.

2-5. Warnings

Warning		Message on the LCD
Low ink		"!" is indicated for an applicable ink tank icon in
		the Status Monitor.
Print head temperature		If the print head temperature does not fall, the
rise		print head error will occur.
Protection of excess rise		If the print head temperature does not fall, the
of the print head		print head error will occur.
temperature
Restrictions on paper		The current paper cannot be set. Change the size
		and type.
USB cable not		Set the PC to start scan.
connected
Cancellation of image		Reset the selected photo information?
	11 / 45

Solution

No special solution.

Since the ink will be used up soon, prepare for a new ink tank.

When the print head temperature falls, the error is automatically cleared.

If the print head error is indicated, repair servicing is required.

If the print head temperature exceeds the specified limit, an intermission is inserted during printing.

Re-select the supported paper type and size.

Connect the USB cable, then turn on the computer.

- Select Yes, and press the OK button.

select information

Yes No

Do you want to clear the scanned photo?

Yes No

=> The image selection is cancelled, and the menu or sub-menu is displayed.

- Select No, and press the OK button. => The LCD returns to the display

immediately before the message was displayed.

2-6. Troubleshooting by Symptom

		Symptom		Solution
Faulty operation		The power does not turn on.		- Confirm the connection of
		The power turns off immediately after		- the power cord, and
		power-on.		- between the logic board and the power supply unit.
				- Replace the
				- power supply unit, or
				- logic board.
		A strange noise occurs.		- Remove foreign material.
				- Attach a removed part if any.
				- Check the operation of the moving parts (such as purge
				unit, carriage unit, and paper feeding mechanism)
				- Replace a faulty part, if any.
		Nothing is displayed on the LCD.		- Confirm the connection between the operation panel, the
				LCD unit, and the logic board.
				- Replace the
				- operation panel unit, or
				- logic board.

A portion of the LCD is not displayed. The display flickers.

-Perform the button and LCD test in the service mode, and confirm that the LCD is displayed without any segments missing or flickering.

-Confirm the connection between the operation panel, the scanning unit, and the harness.

-Replace the

-operation panel unit, or

-logic board.

Paper feed problems (multi-feeding,	- Examine the inside to confirm that no parts are damaged,
skewed feeding, no feeding).	and the rollers are clean.
	- Remove foreign material.
	- Adjust the paper guide properly.
	- Set the paper properly.
	- Confirm the following:
	- selected paper source
	- attachment of the rear cover
	- connection of each harness and the logic board
	- sheet feeder unit operation
	- Replace the
	- sheet feeder unit,
	- cassette unit, or
	- logic board.
Carriage movement problems (contact	- Confirm that the carriage timing slit strip film is free from
to other parts, strange noise).	damage or grease.
	- Clean the carriage timing slit strip film (with ethanol and
	lint-free paper).
	- Remove foreign material.
	- Replace the
	- carriage timing slit strip film, or
	- carriage unit.

Faulty scanning (no scanning, strange noise).

-Confirm the connection between the scanning unit and the logic board.

12 / 45

-Replace the

-scanning unit, or

-logic board.

The CD / DVD tray is not pulled in the feeder.

-Confirm that the reflector of the CD / DVD tray is clean and is free from any damages.

-Replace the

-CD / DVD tray, or

-logic board.

No feeding from the ADF (no operation	- Confirm the connection
of the ADF motor).	- between the ADF motor and the ADF PWB, and
	- between the ADF PWB and the logic board.
	- Replace the
	- document feed unit, or
	- logic board.
No sound from the speaker.	- Confirm the connection between the speaker and the logic
	board.
	- Replace the
	- speaker, or
	- logic board.

Unsatisfactory print quality No printing, or no color ejected.

Printing is faint, or white lines appear on printouts even after print head cleaning.

Line(s) not included in the print data appears on printouts.

Paper gets smeared.

-Confirm that the orange tape is properly removed from an ink tank, and the ink tanks are installed properly.

-Perform print head maintenance.

-Replace the

-ink tank, or

-print head*1.

-Remove foreign material from the purge unit caps, if any.

-Replace the

-purge unit, or

-logic board.

-Remove and re-install the print head.

-Confirm that the ink tanks are installed properly.

-Perform print head maintenance.

-Replace the

-ink tank, or

-print head*1.

-Perform the following:

-Automatic or manual print head alignment in the user mode

-LF / Eject correction in the service mode

-Clean the paper feed rollers.

-Replace the

-purge unit, or

-logic board.

-Feed several sheets of paper.

-Perform bottom plate cleaning.

-Clean the paper path with a cotton swab or cloth.

-Clean the paper feed rollers.

The back side of paper gets smeared.	- Clean the platen rib (clean the paper path with a cotton
	swab or cloth).
	- Confirm that the platen ink absorber fits in place
	properly.
	- Confirm that the paper eject rollers are free from ink
	smear.

A part of a line is missing on printouts. - Perform nozzle check pattern printing, and confirm that ink is properly ejected from all the nozzles.

-Replace the

-ink tank, or

-print head*1.

13 / 45

	Color hue is incorrect.	- Confirm that the ink tanks are installed properly.
		- Perform print head maintenance.
		- Replace the
		- ink tank, or
		- print head*1
		- Perform print head alignment.
	Printing is incorrect.	Replace the logic board.
	No ejection of black ink.	- Confirm that the ink tanks are installed properly.
		- Perform print head maintenance.
		- Replace the
		- ink tank, or
		- print head*1.
		- Remove foreign material from the purge unit caps, if any.
		- Replace the purge unit.
	Graphic or text is enlarged on printouts. When enlarged in the carriage movement direction:
		- Clean grease or oil off the timing slit strip film.
		- Replace the
		- timing slit strip film,
		- carriage unit,
		- logic board, or
		- scanning unit (when copying)
		When enlarged in the paper feed direction:
		- Clean grease or oil off the timing slit disk film or the
		timing slit disk eject film.
		- Replace the
		- timing slit disk film,
		- timing slit disk eject film,
		- timing sensor unit,
		- LF roller,
		- platen unit,
		- logic board, or
		- scanning unit (when copying)
Faulty scanning	No scanning.	- Confirm the connection between the scanning unit and
		the logic board.
		- Replace the
		- scanning unit, or
		- logic board.
		- Confirm that the MP drivers are installed properly.
		- Confirm that the USB cable is connected properly.
	Streaks or smears on the scanned	- Clean the platen glass.
	image.	- Confirm the connection between the scanning unit and
		the logic board.
		- Replace the
		- scanning unit,
		- logic board, or
		- document pressure sheet.
	The document slips over the rollers (a	- Clean the
	copied image is enlarged as a result), or	- friction tab,
	document sheets are not separated from	- document feed rollers, and
	each other.	- separation rollers.
		- Replace the document feed unit.

*1: Replace the print head only after the print head deep cleaning is performed 2 times, and when the problem persists.

<2. LIST OF ERROR DISPLAY / INDICATION>

14 / 45

MX850	TABLE OF CONTENTS

3. REPAIR

3-1. Notes on Service Part Replacement (and Disassembling / Reassembling)

Service part

Logic board ass'y

Notes on replacement*1			Adjustment / settings		Operation check
- Before removal of the logic		After replacement:			- EEPROM information print
board ass'y, remove the power	1.		Initialize the EEPROM.		- Service test print
cord, and allow for approx. 1	2.		Set the ink absorber counter		- Printing via USB connection
minute (for discharge of			value.		- Copying
capacitor's accumulated	3.		Set the destination in the		- Direct printing from a digital
charges), to prevent damages to			EEPROM.		camera (PictBridge)
the logic board ass'y.	4.		Correct the CD / DVD and		- FAX sending and receiving
- Before replacement, check the			automatic print head
ink absorber counter value (by			alignment sensors.
service test print or EEPROM	5.		Check the ink system
information print).			function.
[See 3-4. Verification Items, (1)	6.		Perform LF / Eject correction.
Service test print for details.]	7.		Perform button and LCD test.
			[See 3-3. Adjustment /
			Settings, (6) Service mode,
			for details of 1 to 7.]
	8.		Perform print head alignment
			and LCD language setting in
			the user mode.

Absorber kit	After replacement:
	1. Reset the ink absorber
	counter.
	[See 3-3. Adjustment /
	Settings, (6) Service mode,
	for details.]

-Ink absorber counter volume print (After the ink absorber counter is reset, the counter value is printed automatically.)

Carriage unit	At replacement:		- Service test print (Confirm
	1.	Apply grease to the sliding	CD / DVD and automatic
		portions. [See 3-3.	print head alignment sensor
		Adjustment / Settings, (3)	correction, and ink system
		Grease application.]	function.)
	2.	Check the ink system
		function.
		[See 3-3. Adjustment /
		Settings, (6) Service mode,
		for details.]
	3.	Perform print head alignment
		in the user mode.

Paper feed motor	- The red screws securing the
	paper feed motor are allowed to
	be loosened only for paper feed
	motor replacement. (DO NOT
	loosen them in any other cases.)
Platen unit

At replacement:

1.Adjust the paper feed motor. [See 3-3. Adjustment / Settings, (1) Paper feed motor adjustment, for details.]

After replacement:

- Service test print

1.Check the ink system function.

2.Perform LF / Eject correction.

[See 3-3. Adjustment / Settings, (6) Service mode, for details.]

PR lift shaft ass'y

At replacement:

- Service test print

15 / 45

Input carriage lift gear

Document feed base

Document pressure sheet

1. Apply grease to the sliding portions.

[See 3-3. Adjustment / Settings, (3) Grease application, for details.]

At replacement:

1.Confirm the document pressure sheet position. [See 3-3. Adjustment / Settings, (2) Document pressure sheet replacement, for details.]

Operation panel board	- Be cautious not to scratch or
ass'y	damage the LCD hinge FFC.
LCD viewer unit
Scanner unit
Timing slit strip film	- Upon contact with the film,
	wipe the film with ethanol.
Timing slit disk film	- Confirm no grease is on the
	film. (Wipe off any grease
	thoroughly with ethanol.)
Timing slit disk eject film	- Do not bend the film
Print head

*1: General notes:

At replacement:

1.Check the LCD and operation panel.

[See 3-3. Adjustment / Settings, (6) Service mode, for details.]

After replacement:

- Service test print

1.Perform print head alignment in the user mode.

2.Perform LF / Eject correction in the service mode.

[See 3-3. Adjustment / Settings, (6) Service mode, for details.]

After replacement:	- Service test print
1. Perform print head alignment
in the user mode.

-Make sure that the flexible cables and wires in the harness are in the proper position and connected correctly. See 3-2. Special Notes on Repair Servicing or the Parts Catalog for details.

-Do not drop the ferrite core, which may cause damage.

-Protect electrical parts from damage due to static electricity.

-Before removing a unit, after removing the power cord, allow the machine to sit for approx. 1 minute (for capacitor discharging to protect the logic board ass'y from damages).

-Do not touch the timing slit strip film, timing slit disk film, and timing slit disk eject film. No grease or abrasion is allowed.

-Protect the units from soiled with ink.

-Protect the housing from scratches.

-For the MX850 automatic print head alignment, use Matte Photo Paper (MP-101) to ensure alignment accuracy.

-Exercise caution with the screws, as follows:

i.The red screws of the paper feed motor may be loosened only at replacement of the paper feed motor unit (DO NOT loosen them in other cases).

ii.DO NOT loosen the red screws on both sides of the main chassis, securing the carriage shaft positioning

(they are not adjustable in servicing)

<3-1. Notes on Service Part Replacement>

16 / 45

MX850	TABLE OF CONTENTS

3. REPAIR

3-2. Special Notes on Repair Servicing (Click on the image to enlarge it.)

Be sure to protect the machine from static electricity in repair servicing, especially the LCD, operation panel board, scanner unit, logic board, card board, and NCU board.

************************************************************************

If the power cord is disconnected from the machine (a hard-power-off),

the date/time settings and all the documents saved in the machine memory will be lost.

*************************************************************************

(1) External housing, ADF, and scanner unit removal

1)Remove the cassette, LAN connector cover, and telephone jack cover.

2)Remove the side covers L and R.

i.Remove 4 screws from the rear cover, and 1 screw each from the front left and front right.

ii. Release the hooks inside the cover.

17 / 45

iii. Release the boss on the front right and front left (beside the removed screws).

iv. Release the hooks of the cassette slot.

3) Remove the front covers L and R.

Release the hooks (No.1 in the photos below), and lift the covers (No. 2 in the photos below).

18 / 45

4) Remove the paper output tray.

Slide the door damper to the left until it is released, then remove the tray.

5)Remove the ADF unit.

i.Disconnect the connector, and remove the screw.

ii. Disengage the right hinge (while slightly pushing the hinge to the right, pull up the document cover).

iii. Disengage the left hinge (slowly lay back the document cover).

19 / 45

6)Remove the scanner unit.

i.On the right side, disconnect the connector and ground wire, and remove the logic board cover (for the ground wire and logic board cover, remove 1 screw each).

iii. Remove the damper unit (4 screws).

v. Remove the damper gear (2 screws), and release the scanner lock (1 screw). (The scanner unit can be removed without removing the damper gear.)

ii. Disconnect the connectors. Remove the core from the flat cable, then put the flat cable inside the main case.

iv. Release the scanner lock hook.

vi. While holding the scanner unit in the opened position, disengage the right hinge by slightly pushing the hinge to the right and pulling up the scanner unit.

20 / 45

vii. Disengage the left hinge by sliding the scanner unit to the left.

7)Remove the main case.

i.Remove the 3 screws.

ii. Release the hook on the left side.

(2) Printer unit separation from the bottom case (how to remove the screw under the purge unit)

1) Rotate the purge unit gear toward the rear side of the machine to unlock the carriage.

21 / 45

2) Slide the carriage to the opposite of the home position (to the left), and remove the screw.

(3) Operation panel removal

1) Remove the panel cover.

Using a flat-blade screwdriver, release the front side of the panel cover. While slightly lifting up the cover, pull it toward you.

2) Remove the panel unit.

Remove the 6 screws that fix the panel unit to the scanner unit. Pull the panel unit toward you, then disconnect the connector and the ground wire (1 screw).

22 / 45

3) Remove the panel board.

Remove the 14 screws and disconnect the connector.

Caution: DO NOT turn over the panel frame after the panel board is removed. The buttons are not fixed to the frame, thus they will fall if the frame is turned over.

(4) AC adapter attachment

< Japan model >

Using a thin flat-blade screwdriver, push the arrester ground wire until it fits to the arrester ground pin inside the AC adapter.

Note: After connection, gently pull the ground wire and confirm that it will not be removed.

23 / 45

< Other models>

Fit the arrester ground wire in 2 grooves as shown in the photo.

(5) Emblem removal

Push the top edge of the emblem to remove it from the double-sided adhesive tape.

(6) Cable wiring and connection

1) Wiring on the right side

Be cautious of the core position.

24 / 45