Canon Pixma MP520 Service Manual. Parts Catalog

MP520

Service Manual

Revision 0

QY8-13BN-000

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 yo ur 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.

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.

MP520

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/ TROUBLESHOOTING

2-1. Operator Call Errors 2-2. Service Call Errors 2-3. Other Error Messages 2-4. Warnings 2-5. Troubleshooting by Symptom

3. REPAIR

3-1. Notes on Service Part Replacement 3-2. Special Notes on Repair Servicing

(1) Side cover unit R removal (2) Side cover unit L removal (3) Scanner flexible cable attachment (4) Cable wiring and connection (5) Ink tube installation

3-3. Adjustment / Settings

(1) Paper feed motor adjustment (2) Carriage rail adjustment (3) Document pressure sheet attachment (4) Sheet feeder unit adjustment (5) Front tray paper feed roller cleaning (6) Grease application (7) Ink absorber replacement (8) Ink absorber counter setting (9) User mode (10) Service mode

A: Service mode operation B: Destination settings C: Ink absorber counter resetting D: Ink absorber counter setting E: Button and LCD test

3-4. Verification Items

(1) Service test print (2) Ink absorber counter value print

4. MACHINE TRANSPORTATION

MP520 TABLE OF CONTENTS

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1. MAINTENANCE

1-1. Adjustment, Periodic Maintenance, Periodic Replacement Parts, and Replacement

Consumables by Service Engineer

(1) Adjustment

Adjustment Timing Purpose Tool

EEPROM initialization

Destination settings (EEPROM settings)

Ink absorber counter resetting (EEPROM settings)

Ink absorber counter value setting (EEPROM settings)

Paper feed motor position adjustment

Carriage rail

position adjustment

Print head alignment

Grease application - At carriage unit or carriage

Ink system function check

LCD language settings

Document pressure sheet position adjustment

- At logic board replacement To initialize settings None. Perform in the service mode.

- At logic board replacement To set destination. None. Perform in the service mode.

- At logic board replacement

- At ink absorber replacement

- At logic board replacement To set the ink amount data in the

- At paper feed motor

replacement

- At carriage unit replacement

- After carriage rail removal

and re-assembly

- At print head replacement

- At logic board replacement

- When print quality is not

satisfying

rail replacement

- At LF earth spring or paper

feed roller replacement

- At PG - AP arm lever

replacement

- At logic board replacement

- At spur base replacement

- At carriage unit replacement

- At logic board replacement To set the language to be

- At document pressure sheet

replacement

- At document pressure plate

ass'y replacement

To reset the ink absorber counter.

ink absorber to the ink absorber counter.

To adjust the belt tension. (Position the paper feed motor so that the belt is stretched tight.)

To adjust the distance between the print head and paper (between the carriage and the platen).

To secure the dot placement accuracy.

To maintain sliding properties of the following items:

- Carriage rail

- LF earth spring

- Eject roller

- PG

- AP arm lever To maintain detection

functionality for presence of the ink tanks and each ink tank position.

displayed on the LCD.

Hold the sheet with the long side down, then position its upper left corner approx. 1 mm in from the platen glass reference edges (back left).

None. Perform in the service mode.

None. 5 min.

None. 3 min.

- FLOIL KG-107A

- IF-20

- MOLYKOTE PG641

None. Perform in the service mode.

None. Perform in the user mode.

None. 1 min.

Approx.

time

1 min.

(Manual)

1 min.

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

2 / 33

(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

Print head alignment

Print head cleaning When print quality is not satisfying. To improve nozzle

Print head deep cleaning

Ink tank replacement

Rear tray paper feed roller cleaning

Front tray paper feed roller cleaning

Bottom plate cleaning

Scanning area cleaning

Exterior cleaning When necessary To clean the machine

At print head replacement To ensure accurate dot

placement.

conditions.

When print quality is not satisfying, and not improved by print head cleaning.

When an ink tank becomes empty. ("No ink error" displayed on the monitor or on the machine LCD, or short flashing of an ink tank LED)

- When paper does not feed properly.

- When the front side of the paper is smeared.

- When paper does not feed properly.

- When the front side of the paper is smeared. When the back side of the paper is smeared. To clean the platen

When the platen glass or document pressure sheet is dirty.

To improve nozzle conditions.

To replace the empty ink tank.

To clean the paper feed rollers.

ribs. To clean the platen

glass and document pressure sheet.

exterior

1-3. Special Tools

- Machine buttons

- Computer (MP driver)

- Machine buttons

- Computer (MP driver)

- Machine buttons

- Computer (MP driver)

--- 1 min.

- Machine buttons

- Computer (MP driver) Manually clean the roller

with a cotton swab.

- Machine buttons

- Computer (MP driver) Soft, dry, and clean lint-

free cloth.

Soft, dry, and clean lintfree cloth (cloth for cleaning glasses, etc.)

Approx.

time

3 min. (Manual)

1 min.

2 min.

1 min.

Name Tool No. Application Remarks

FLOIL KG-107A QY9-0057-000 ELECTRICITY GREASE IF-20 CK-8006-000 To the LF earth spring sliding portions. MOLYKOTE PG641 CK-0562 To the PG - AP arm lever sliding portions.

To the sliding portions of the carriage rail and main chassis.

In common with the S520.

1-4. Serial Number Location

3 / 33

On the spur base unit (visible at the front right when the scanning unit is opened).

<1. MAINTENANCE>

MP520 TABLE OF CONTENTS

4 / 33

2. LIST OF ERROR DISPLAY / INDICATION / TROUBLESHOOTING

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 e rror.

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

Error

No paper in the rear tray. [1000] Rear tray.

No paper in the front tray.

Paper jam. [1300] The paper is jammed. Clear the paper Paper jam in the rear

guide. Ink may have run out. [1600] The following ink may have run out.

Ink tank not installed. [1660] The following ink tank cannot be

Print head not installed, or not properly installed.

Error code

[1003] Front tray.

[1303]

[1401] Print head is not installed. Install the

Message on the LCD Solution

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

and press [OK].

Replacing the ink tank is recommended. (U041)

recognized. (U043) (Applicable ink tank icon)

print head. (U051)

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

Confirm that the front tray is selected as the paper source. Set the paper in the front tray, 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.

Install the print head properly.

Print head temperature sensor error.

Faulty EEPROM data of the print head.

Multiple ink tanks of the same color installed.

Ink tank in a wrong position.

Warning: The ink absorber becomes almost full.

[1403] The type of print head is incorrect.

Install the correct print head. (U052)

[1405,

1682]

[1681] More than one ink tank of the

following color is installed. (U071)

[1680] Some ink tanks are not installed in

place. (U072)

[1700,

1701, 1710, 1711]

Contact the support center or service center for ink absorber replacement. Press [OK] to continue printing.

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

Replace the wrong ink tank(s) with the correct one(s).

Install the ink tank(s) in the correct position.

Replace the ink absorber, and reset its counter. [See 3-

3. Adjustment / Settings, (10) Service mode.]

Pressing the OK button will exit the error, and 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

5 / 33

camera or digital video camera does not support Camera Direct Printing.

[2001] The device may be incompatible.

Remove the device and check the manual supplied with the connected device.

Remove the cable between the camera and the machine.

The remaining ink amount unknown.

Ink tank not recognized. [1684] The following ink tank cannot be

Ink tank not recognized. [1410

Scanning unit (printer cover) open.

Non-supported hub [2002] An unsupported USB hub is

No ink (no raw ink). [1688] The following ink has run out.

[1683] (Applicable ink tank icon)

The remaining level of the following ink cannot be correctly detected. Replace the ink tank. (U130)

recognized. (U140) (Applicable ink tank icon)

The following ink tank cannot be

recognized. (U150)

1419]

[1200] Cover is open. Close cover. Close the scanning unit (printer cover).

(Applicable ink tank icon)

connected. Remove the hub.

Replace the ink tank. (U163) (Applicable ink tank icon)

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).

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

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 EEPROM that the function to detect the remaining ink amount was disabled.

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

Alarm and

Power LEDs

2 times Carriage error [5100] An error occurred in the carriage

3 times Line feed error [6000] An error occurred in the LF encoder

4 times Purge cam sensor error [5C00] An error occurred in the purge unit. - Purge unit (QM3-2651)

Error

Error code

encoder signal.

signal.

Conditions

(Replacement of listed parts,

which are likely to be faulty)

- Carriage unit (QM3-2650)

- Timing slit film (QC2-5687)

- Logic board (QM3-2599)

- Carriage motor (QK1-1500)

- Timing sensor unit (QM3-

2572)

- Timing slit disk film (QC2-

5687)

- Feed roller (QL2-2206)

- Logic board (QM3-2599)

- Paper feed motor (QK1-3849)

- Logic board (QM3-2599)

Solution

5 times ASF (cam) sensor error [5700] An error occurred in the ASF cam

6 / 33

sensor.

- Sheet feed unit (QM3-2647)

- PE sensor board (QM3-2571)

- Logic board (QM3-2599)

6 times Internal temperature

error

7 times Ink absorber full [5B00,

8 times Print head temperature

rise error

9 times EEPROM error [6800] A problem occurred in writing to the

10 times VH monitor error [B200] The internal temperature exceeded the

12 times APP position error [5C10] An error occurred in the APP motor

[5400] The internal temperature is not normal. - Logic board (QM3-2599)

The ink absorber is supposed to be full. 5B10, 5B01, 5B11]

[5200] The print head temperature exceeded the

Message on the LCD:

Ink absorber full. Service required.

Error codes:

Overseas: 5B00: Main ink absorber 5B10: Borderless-print ink absorber Japan: 5B01: Main ink absorber 5B11: Borderless-print ink absorber

specified value.

EEPROM.

specified value.

during purging operation.

- Carriage unit (QM3-2650)

- Ink absorber kit (QY5-0192)

- Print head (QY6-0070)

- Logic board (QM3-2599)

- Print head (QY6-0070)

- Carriage unit (QM3-2650)

- Logic board (QM3-2599)

- Sheet feed unit (QM3-2647)

- Purge unit (QM3-2599)

- Logic board (QM3-2651)

14 times APP sensor error [6A90] An error occurred in the APP cam

sensor.

15 times USB Host VBUS

overcurrent

19 times Ink tank position sensor

error

22 times Scanner home position

error

Power and Alarm LEDs lit

ROM / RAM error --- The check sum value is incorrect in the

[9000] The USB Host VBUS is overloaded. - Logic board (QM3-2599)

[6502] None of the ink tank position is detected. - Spur base unit (QM3-2653)

[5010] The scanner unit cannot detect the home

position, or the scanner unit warming-up

is not performed properly at power-on.

On the LCD, "Scanner is not operating

correctly." is displayed.

ROM check or RAM check at hard-

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 (QY5-0192) 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, (10) Service mode, for details.]

- Sheet feed unit (QM3-2647)

- Logic board (QM3-2599)

- Scanner unit (QM3-2643)

- Logic board (QM3-2599)

2-3. Other Error Messages

7 / 33

Message on the LCD Cause Solution

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

Borderless print is not available for paper from front tray. Change the paper source and press [OK].

Change the setting(s). Settings made conflict each other. (e.g.

Device memory is full. Reduce the number of documents (photos, etc.) to scan or copy.

Failed to scan. Either document cannot be scanned or is not placed on the platen glass.

Press <>.

(<>: Color button icon) Press <>.

(<>: Black button icon)

The paper type being used is not supported for paper feeding from the front tray.

Borderless print is attempted when the front tray is selected as the paper source.

Selecting borderless printing on plain paper) The memory is not sufficient to do the print

job in copying.

The machine failed in scanning the document for Fit-to-page copy, or photos or films were not recognized in pre-scanning.

The Black button was pressed, but it is invalid.

The Color button was pressed, but it is invalid.

Change the paper source to the rear tray.

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

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

Press the OK button to clear the error.

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

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

There are no photos in memory card. Supported image files are not in the

memory card.

The value exceeds the number of copies you can print.

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

DPOF information is not saved in the memory card.

The number of copies to print is not set. Input the number of copies.

During selecting images or specifying the number of copies, the total print quantity exceeds the prescribed value of 999.

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.

Printing was attempted without specifying the print quantity (with the print quantity left "0" (zero)).

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.

A temporary error. The last operation before the error is cancelled, and the total print quantity returns to the value before the error.

Set a memory card.

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

A temporary error. Specify the print quantity.

This layout is available only for A4 or 8.5"x11"(215x279).

Change the setting after removing the card.

The card is currently write-enabled. With the memory card set to the Read/write A temporary error. Remove the memory

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.

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

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

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

Set to read-only mode before

8 / 33

performing operation.

mode, Card Direct printing operation was attempted from the menu.

card, change the memory card setting to Read-only, then perform Card Direct printing.

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

Failed to scan Photo Index Sheet.

Check the orientation, position and marking. <See manual>

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

The machine failed in scanning the Photo Index Sheet.

2-4. Warnings

Warning Message on the LCD Solution

Low ink "!" is indicated for an applicable ink tank icon in

the Status Monitor.

Print head temperature rise

If the print head temperature does not fall, the print head error will occur.

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

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

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

- Place the sheet in the correct orientation and position.

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.

Protection of excess rise of the print head temperature

Restrictions on paper The current paper cannot be set. Change the size

USB cable not connected

Cancellation of image select information

If the print head temperature does not fall, the print head error will occur.

and type. Set the PC to start scan. Connect the USB cable, then turn on the computer.

Reset the selected photo information? Yes No

Do you want to clear the image scanned from the photo? Yes No

Do you want to clear the scanned image and rescan? Yes No

2-5. Troubleshooting by Symptom

Symptom Solution

Faulty operation The power does not turn on.

The power turns off immediately after power-on.

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

Re-select the supported paper type and size.

- Select => The image selection is cancelled, and the

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

- Confirm the connection of

- the power cord, and

- between the logic board and the power supply unit.

- Replace the

- power supply unit, or

- logic board.

, and press the OK button.

Yes

menu or sub-menu is displayed.

immediately before the message was displayed.

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.

9 / 33

Nothing is displayed on the LCD. - Confirm the connection between the operation panel, the

LCD unit, and the logic board.

- Replace the

- LCD unit, or

- logic board.

A portion of the LCD is not displayed. - 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 LCD unit, and the logic board.

- Replace the

- LCD unit, or

- logic board.

Paper feed problems (multi-feeding, skewed feeding, no feeding).

Carriage movement problems (contact to other parts, strange noise).

- Examine the inside to confirm that no parts are damaged, 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 (for feeding from the front tray)

- connection of each harness and the logic board

- Replace the

- sheet feeder unit,

- ASF cover unit,

- bottom case unit (for paper feeding from the front tray), or

- logic board.

- Confirm that the carriage timing slit strip film is free from 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.

- Replace the

- scanning unit, or

- logic board.

Unsatisfactory print quality No printing, or no color ejected. - Confirm that the ink tanks are installed properly.

- Perform print head maintenance.

- Replace the

- ink tank, or

- print head

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

- Replace the

- purge unit, or

- logic board.

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.

- Remove and re-install the print head.

- Confirm that the ink tanks are installed properly.

- Perform print head maintenance.

- Replace the

- ink tank,

10 / 33

- print head

- purge unit, or

- logic board.

Paper gets smeared. - Feed several sheets of paper.

- Perform bottom plate cleaning.

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

- Clean the rear tray paper feed rollers.

- Clean the front tray paper feed rollers.

A part of a line is missing on printouts. - Replace the

- ink tank, or

- print head

Color hue is incorrect. - Confirm that the ink tanks are installed properly.

- Perform print head maintenance.

- Replace the

- ink tank, or

- print head

- 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

- 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, or

- logic board.

When enlarged in the paper feed direction:

- Clean grease or oil off the timing slit disk film.

- Replace the

- timing slit disk film,

- timing sensor unit,

- LF roller, or

- logic board.

Faulty scanning No scanning. - Confirm the connection between the scanning unit and

the logic board.

- Replace the

- scanning unit, or

- logic board.

Streaks or smears on the scanned image.

- Clean the platen glass.

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

- Replace the

- scanning unit,

- logic board, or

- document pressure sheet.

*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 / TROUBLESHOOTING>

MP520 TABLE OF CONTENTS

11 / 33

3. REPAIR

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

Service part

Logic board ass'y (QM3-

2599)

Absorber kit (QY5-0192)

Carriage unit (QM3-

2650)

Notes on replacement

- Before removal of the logic board ass'y, remove the power cord, and allow for approx. 1 minute (for discharge of capacitor's accumulated charges), to prevent damages to the logic board ass'y.

- Before replacement, check the ink absorber counter value (by service test print or EEPROM information print). [See 3-4. Verification Items, (1)

Service test print for details.]

- The screws securing the

carriage rail are allowed to be loosened only at carriage replacement. Before removing the screws, mark the positions of the screws on the carriage rail so that they will be returned to their original positions after the carriage is replaced.

Adjustment / settings Operation check

After replacement:

1. Initialize the EEPROM.

2. Set the destination in the EEPROM.

3. Set the ink absorber counter value.

4. Set the language to be displayed on the LCD. [See 3-3. Adjustment /

Settings, (10) Service mode,

for details of 1 to 4.]

5. Perform print head alignment in the user mode.

After replacement:

1. Reset the ink absorber counter. [See 3-3. Adjustment /

Settings, (10) Service mode,

for details.]

At replacement:

1. Apply grease to the sliding portions. [See 3-3. Adjustment /

Settings, (6) Grease application, for details.]

After replacement:

2. Adjust the distance between the print head and the paper (between the carriage rail and the platen). [See 3-3. Adjustment /

Settings, (2) Carriage rail adjustment, for details.]

3. Check the ink system function. [See 3-3. Adjustment /

Settings, (10) Service mode,

for details.]

4. Perform print head alignment in the user mode.

- EEPROM information print

- Service test print

- Printing via USB connection

- Copying

- Direct printing from a digital camera (PictBridge)

- Ink absorber counter value print (Printing is performed automatically after the ink absorber counter is reset.)

- Service test print (Confirm ink system function.)

- Printing on thick paper.

Paper feed motor (QK1-

3849)

Spur base unit (QM3-

2653)

- 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.)

At replacement:

1. Adjust the paper feed motor. [See 3-3. Adjustment /

Settings, (1) Paper feed motor adjustment, for details.]

After replacement:

1. Check the ink system function. [See 3-3. Adjustment /

Settings, (10) Service mode,

for details.]

- Service test print

Document pressure plate

12 / 33

ass'y (QM3-2642) Document pressure sheet

(QC2-5194) Scanner unit (QM3-2643)

At replacement:

1. Adjust the document pressure sheet position. [See 3-3. Adjustment /

Settings, (2) Carriage rail adjustment, for details.]

Timing slit strip film (QC2-5687)

Timing slit disk film (QC1-9597)

Print head (QY6-0070)

*1: General notes:

- 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 and timing slit disk film. No grease or abrasion is allowed.

- Protect the units from soiled with ink.

- Protect the housing from scratches.

- Exercise caution with the screws, as follows:

i. The 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. The screws securing the carriage rail may be loosened only at replacement of the carriage unit. After carriage

unit replacement, print on thick paper to confirm that the distance between the print head and paper (between the carriage rail and the platen) is correct, and that the print head does not contact the paper during printing. If the print head contacts the paper, adjust the carriage rail position, while referring to [3-3. Adjustment / Settings, (2)

Carriage rail adjustment.]

- Upon contact with the film, wipe the film with ethanol.

- Confirm no grease is on the film. (Wipe off any grease thoroughly with ethanol.)

- Do not bend the film

After replacement:

1. Perform print head alignment in the user mode.

After replacement:

1. Perform print head alignment in the user mode.

- Service test print

<3-1. Notes on Service Part Replacement>

MP520 --- 3. REPAIR TABLE OF CONTENTS

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3-2. Special Notes on Repair Servicing

(1) Side cover unit R removal

1) Remove the rear top cover. Slightly lift the front bottom of the rear top cover, and slide it.

3) Release the 2 bosses and remove the ASF cover unit. 4) Slightly lift the front center (as indicated by the red

2) Remove the 3 screws and the rear middle frame.

arrow 1), and remove the panel top cover. Then remove the light guide (pointed by the red arrow 2).

5) Remove 2 screws from the back of the machine. 6) Open the card slot cover, and remove 1 screw.

7) Release the 4 claws, and remove the side cover unit R.

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8) Remove the front cover R.

(2) Side cover unit L removal

1) Remove the front cover L. Release the claw (No. 1 in the photo), and slide the cover to the right (No. 2 in the photo).

3) Remove 2 screws from the back of the machine. 4) Release the 2 bosses, and remove the ASF cover unit.

2) Remove 1 screw from the front of the machine.

5) Release the 6 claws, and remove the side cover unit L.

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(3) Scanner flexible cable attachment

1) Attach the scanner flexible cable (indicated by the red line in the photo) so that it passes under the scanner flexible sheet (indicated by the blue line in the photo).

< Scanner flexible cable layout, seen with the scanner flexible sheet removed >

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(4) Cable wiring and connection

1) Scanner relay cable and paper feed motor cable

2) DC flexible cable 3) FCC guide, ASF sensor cable, timing sensor cable,

and carriage flexible cables.

(5) Ink tube installation

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< About Circle 1 in the photo > Fit the tube between the ribs.

< About Circle 2 in the photo> Fit the tube between the ribs, and adjust the tube so that the tube end (indicated by the blue circle in the photo) is between the edges of the right and left ribs (between the red lines in the photo).

<3-2. Special Notes on Repair Servicing>

MP520 --- 3. REPAIR TABLE OF CONTENTS

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3-3. Adjustment / Settings

(1) Paper feed motor adjustment

1) When attaching the motor, fasten the screws so that the belt is properly stretched (in the direction indicated by the blue arrow in the photo below).

2) After replacement, be sure to perform the service test print, and confirm that no strange noise or faulty print operation (due to dislocation of the belt or gear, or out-of-phase motor, etc.) occurs.

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

(2) Carriage rail adjustment

Perform the following adjustments when attaching the carriage rail:

1) Before loosening the screws, mark the following positions on the rail:

- Left side: Mark the boss position. - Right side: Mark the hole position.

2) In attaching the carriage rail, make sure that the left boss and right hole fit to the marks made in step 1) respectively, then faste n the screws.

3) Be sure to perform the confirmation test detailed below; confirm that the print quality is proper and the print head is not contacting the paper.

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