Canon MP 780, MP 750 User Manual

PIXMA MP 780 PIXMA MP 750

SER VICE MANUAL

Canon

Copyright 2004, Canon U.S.A. This technical publication is the proprietary and confidential information of Canon U.S.A. which shall be retained for reference purposes by Authorized Service Facilities of Canon U.S.A. Its unauthorized use is prohibited.

PIXMA MP750/780 SERVICE MANUAL

REVISION 0

PIXMA MP750 H12-4562 120V USA PIXMA MP750 H12-4563 230V EMB PIXMA MP750 H12-4564 230V GB PIXMA MP750 H12-4565 230V EUM PIXMA MP750 H12-4566 120V CND PIXMA MP750 H12-4568 230V AUS

PIXMA MP780 H12-4582 120V USA PIXMA MP780 H12-4583 230V EE/NE PIXMA MP780 H12-4584 230V GB/ME/NORD/ZA PIXMA MP780 H12-4585 230V AT/CH/DE PIXMA MP780 H12-4586 230V WEST PIXMA MP780 H12-4587 120V CND/LTN PIXMA MP780 H12-4588 230V AUS PIXMA MP780 H12-4589 230V AE PIXMA MP780 H12-4597 230V CHN

HY8-13A3-000

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 your region.

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.

I. MANUAL OUTLINE

This manual consists of the following three parts to provide information necessary to service the PIXMA MP750/MP780:

Part 1: Maintenance

Information on maintenance and troubleshooting of the PIXMA MP750/MP780

Part 2: Technical Reference

New technology and technical information such as FAQ's (Frequently Ask ed Questions) of th e PIXMA MP750/MP780

Part 3: Appendix

Block diagrams and pin layouts of the PIXMA MP750/MP780

Reference:

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

II. TABLE OF CONTENTS

Part 1: MAINTENANCE

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

Consumables by Service Engineer 1 - 3 1-2. Customer Maintenance 1 - 4 1-3. Product Life 1 - 4 1-4. Special Tools 1 - 5 1-5. Serial Number Location 1 - 6 2. LIST OF ERROR DISPLAY / INDICATION 1 - 6 2-1. Users Error Messege 1 - 9 2-2. Users Error Code 1 - 9 2-3. Service Call Errors 1 - 14 2-4. New Error Codes and Recovery Methods 1 - 16 2-5. Warnings 1 - 17 2-6. Troubleshooting by Symptom 1 - 22 2-7 Processing Communication Problems (MP780 only) 1 - 22 2-7-1 Initial Identification of Problems 1 - 24 2-7-2 Procedures for Processing Communication Problems 1 - 25 2-7-3 Procedures for Processing Communication Problems with Canon Facsimile. 1 - 26 2-7-4 Procedures for Processing Communication Problems with other Manufacturer's

Facsimiles. 1 - 27 3. REPAIR 1 - 27 3-1. Notes on Service Part Replacement (and Disassembling / Reassembling) 1 - 30 3-2. Special Notes on Repair Servicing 1 - 30

3-2-1 Flexible Cable and Harness Wiring, Connection

1 - 33 3-3. Adjustment / Settings 1 - 33 3-3-1 Paper Feed Motor Adjustment 1 - 33 3-3-2 Gear Phase Adjustment 1 - 35 3-3-3 Lift Cam Shaft Ass’y Adjustment 1 - 36 3-3-4 Solenoid Cam Spring Location 1 - 36 3-3-5 Carriage Shaft Clip Location 1 - 37 3-3-6 White Sheet Location 1 - 39 3-3-7 Grease Application 1 - 41 3-3-8 Waste Ink Counter Setting 1 - 41 3-4. User Data Flow 1 - 46 3-5. Service Switches 1 - 46 3-5-1 Hardware Switches 1 - 46 3-5-2 Service Data Setting 1 - 47 3-5-3 Service Data Registration / Setting Method 1 - 48 3-5-4 Service Data Flowchart 1 - 54 3-5-5 Explanation of service data 1 - 55 3-5-6 New SSSWs / parameters added to this model 1 - 60 3-5-7 SSSW Default Setting 1 - 78 3-6. Test Mode / Factory Mode 1 - 78 3-6-1 Test Mode / Factory Mode Overview

1 - 79 3-6-2 Test Mode Menu 1 - 80 3-6-3 Factory Mode 1 - 81 3-6-4 Operation Panel Test 1 - 83 3-6-5 Print Test 1 - 85 3-6-6 CD-R Calibration (230V only) 1 - 85 3-7. Upgrading the version of SPCNT Flash ROM 1 - 86 3-8. Verification Items 1 - 86 3-8-1 Users Report Service Test Print 1 - 87 3-8-2 Service EEPROM Information Print 1 - 88 3-8-3 System Data List (MP780 only) 1 - 95 3-8-4 System Dump List (MP780 only) 1 - 99 3-8-5 Service Activity Report (sending/receiving) (MP780only) 1 - 101 3-8-6 EEPROM Information Print 1 - 102 4. Cleaning Your Machine 1 - 102 4-1 Caution 1 - 102 4-2 Cleaning the Exterior 1 - 102 4-3 Cleaning the Scan Area 1 - 103 4-4 Cleaning the Interior 1 - 103 4-5 Cleaning the Feeder Cover 1 - 104 4-6 Cleaning the Rubber Sheet / Paper Feed Rollor / Separate Rollor 1 - 104 4-7 Cleaning the Paper Feed Rollor 1 - 105 4-8 Cleaning the Bottom Plate 1 - 106 5. Transportation

Part 2: TECHNICAL REFERENCE

2 - 1 1. New Technologies 2 - 3 2. Cleaning Mode and Amount of Ink Purged 2 - 5 3. Print Mode 2 - 9 4. FAQ (Problems Specific to the MP750/MP780 and C orrecti ve Ac ti ons)

Part 3: APPENDIX

3 - 1 1. Wiring Diagram 3 - 2 2. Circuit Diagram 3 - 3 2-1 NCU Circuit Diagram1 3 - 4 2-2 NCU Circuit Diagram2 3 - 5 2-3 Relay Circuit Diagram 3 - 6 3. Specification

Part 1

Maintenance

1. MAINTENANCE

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

Replacement Consumables by Service Engineer

(1) Adjustment

Adjustment Timing Purpose Tool

ALL CLEAR (EEPROM initialization) *1

TYPE settings (EEPROM settings) *1

Waste ink counter resetting (EEPROM settings)

Waste ink counter setting (EEPROM initialization)

CD-R sensor / automatic print head alignment sensor correction (EEPROM settings) (230V only)

At SPCNT BOARD ASS’Y replacement

-At SPCNT BOARD ASS’Y replacement

-At excecuting All clear

At bottom case unit replacement At ink absorber INK ABSORBER (HY7-2885/2886/2887/28 88/2889/2890/2891/2953)

At SPCNT BOARD ASS’Y replacement

At SPCNT BOARD ASS’Y replacement At carriage unit replacement

To initialize settings other than the following

-1-touch speed dialing (MP780 only)

-Service/User soft SW (MP780 only)

-Tx/Rx infomation (MP780 only)

-Various counters

-TYPE Setting

-To set the type

-To set the destination

To reset the waste ink counter.

Waste ink counter setting None

To correct the CD-R and automatic print head alignment sensor.

None To initialize the settings, select #8 CLEAR–ALL in the service mode

None Select #5 TYPE in the service mode Power SW

OFF/ON*1

None Select #7 PRINTER in the service mode, and input “0” at #5 INK ABS CAPA.

Print out the EEPROM information, and select #7 PRINTER in the service mode. Then, register at #5 INK ABS CAPA. None. (Correction performed through FACTORY MODE-[2]PRI NTER-SHUK KEN at the same time as printing.)

Approx time

1 min

1min

1 imn

1 min

1 - 1

Adjustment Timing Purpose Tool

Print head alignment

Paper feed motor position adjustment*

Grease application

Note: DO NOT loosen the red screws on both sides of the main chassis, securing the carriage shaft

positioning.

*1: When SPCNT BOARD ASS’Y is replaced, be sure to select the settings of [#8CLEAR]-[ALL]

and [#5TYPE] in Service Mode, and turn the power OFF/ON with the Power button (Software Power: OFF/ON). DO NOT turn the power OFF/ON by removing and inserting the power code (Hardware Power: OFF/ON). In this case, data may not be written correctly.

*2: Red screws of paper feed motor

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

- At print head replacement

- At SPCNT BOARD ASS’Y replacement

-At paper feed motor unit replacement

-At carriage unit replacement

-At chassis' upper gear replacement

-At LIFT CAM SHAFT replacement

To ensure accurate dot placement.

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

-To maintain sliding

properties of the carriage, carriage shaft, and shaft lift.

-To protect the chassis'

upper gear.

-To LIFT CAM SHAFT

replacement

None.(Main body buttons) Computer (settings via the printer driver) None For the adjustment, refer to [3-3 Adjustment/Se ttings (1) PAPER FEED MOTOR Installation Adjustment.

-FLOIL KG-107A

-MOLYKOTE HP300

Approx time

2 min

1 min

(2) Periodic maintenance

Adjustment Timing Purpose Tool Approx.

time

None

1 - 2

(3) Periodic replacement parts

Adjustment Timing Purpose Tool Approx.

None

(4) Replacement consumables

Adjustment Timing Purpose Tool Approx.

None

1-2 Customer Maintenance

time

Adjustment Timing Purpose Tool

Print head alignment

Print head cleaning When print quality is

Print head deep cleaning

Ink tank replacement

Paper feed roller cleaning

CD-R print position adjustment (230V only)

Bottom plate cleaning

At print head replacement.

not satisfying.

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

When an ink tank becomes empty.(No ink error) When paper does not feed properly.

At CD-R printing, when necessary

When the back side of the paper is smeared

To ensure accurate dot placement.

To improve nozzle conditions.

- -

To clean the paper feed rollers.

To correct CD-R print position.

To clean the platen ribs. None

None Main body buttons Computer (automatic settings via the printer driver)

None Main body buttons Computer (settings via the printer driver)

None Computer (setting via the printer driver) .

None Main body buttons None Computer (application software)

Computer (application software)

Approx.

time

3min

1 min

2min

1min

1 - 3

1-3 Product Life

(1) Main body

Specified print volume (a), (b), or the years of use (c), whichever comes first. (a) Scanning Section: 15,000 pages (b) Printing Section: 18,000 pages Copy Print FAX Bk

1,500 character pattern + Post card

Address printing

1,500 character pattern - - 360 pages

Color

(2) Ink tank

BCI-3eBK: 900 pages (JEIDA ST D pat t e rnJ1 , pl ain paper standerd mode)

A4, 7.5% duty per color pattern 2,520 pages 2,880 pages A4, photo, borderless printing 180 pages 360 pages L, photo, borderless printing 1,080 pages 1,980 pages Postcard, photo, borderless printing 360 pages 1,260 pages -

5 years of use

3,240 pages (MP780) 3,420 pages (MP750)

3,780 pages (MP780) 3,960 pages (MP750)

(MP780)

740 pages (Black 1,500 character pattern, plain paper / standard mode) 1,300 pages (ISO JIS-SCID No. 5 / plain paper / standard mode) BCI-6C: 550 pages (ISO JIS-SCID No. 5 / plain paper / standard mode) BCI-6M: 430 pages (ISO JIS-SCID No. 5 / plain paper / standard mode) BCI-6Y: 360 pages (ISO JIS-SCID No. 5 / plain paper / standard mode) BCI-6BK: 2,000 pages (ISO JIS-SCID No. 5 / plain paper / standard mode)

1-4 Special Tools

Name Tool No. Application Remarks MOLYKOTE

HP300 FLOIL KG-107A QY9-0057-000 To be applied to the sliding portion of the

CK-8012-000 To be applied to the chassis' upper gear,

and to the sliding portion of the shaft lift.

carriage and the bearing portion of the carriage shaft.

New

In common wit other models.

1 - 4

1-5 Serial Number Label Location

On the right side of the backside in the bottom case (close to the rating plate)

Figure1-1 Serial Number Label Location

1 - 5

2. LIST OF ERROR DISPLAY / INDICATION

User error messages

Look for the applicable error message and execute the appropriate countermeasures.

Error Codes

As for the causes and countermeasures, only the error codes that are newly incorporated in the unit remedies unique to the product are included in New Error Codes and Recovery Methods. For the causes and countermeasures of other error codes, refer to the separate G3/G4 Facsimile Error Code List (Rev. 2).

Service error code output

When service data #1 SSSW SW01 Bit0 is set to “1”, the following service error codes are displayed when an error occurs.

2-1 User’s error messege

"CARTRIDGE JAMMED"

Printing position correction failed

Cause: Carriage movement prevented by one of the following.

Damaged shaft. Parts deformed. (Carriage or guide frame) Insufficient grease.

Solution: Replace the shaft.

Replace the deformed parts. Apply more grease.

Cause: Bi-directional print displacement correction failed because the carriage motor is

out of step, or some similar reason.

Solution: Replace the carriage motor.

Home position error

Cause1: Tried to stop the carriage unit that has been moving or to move the carriage unit at a pouse by

force. Solution1: Do not touch the carriage unit other than cartridge replacement position. Cause2: Foreign body in carriage section. Solution2: Open flatbed ass’y and remove the foreign body . Cause3: Loose carriage belt. Solution3: Replace carriage unit Cause4: Carriage motor does not work. Solution4 (1) Switch power OFF/ON. (2) Replace carriage motor. Cause5: The position of the carriage cannot be detected (due to smears on the carriage

encoder film or SPCNT board failure). Solution5: (1) Switch power off/on. (2) Wipe the carriage encoder film with a cloth soaked with alcohol. (3) Replace the carriage encoder film. (4) Replace the SPCNT board.

1 - 6

Note:

This error message means the same as service error codes ##338 and ##340. When this error occurs in this model, it is not treated as a service error, but as a user error, and the error message is displayed.

“COVER OPEN”

Cause: You opened the scanning unit (printer cover) during an operation. Solution: Close the scanning unit (printer cover). Cause: Damaged scanner open arm ass’y, damaged scanner sensor arm, or SPCNT board ass’y failure. Solution: Replace the scanner open arm ass’y, replace the scanner sensor arm, or replace the SPCNT board

ass’y.

“CHECK PRINTER (PRESS [OK])” (##334 - ##336, ##343, ##345, ##346, ##352, ##356 - ##362)

Cause: The carriage unit does not move due to a foreign body in the carriage section. Solution: Open flatbed ass’y and remove the foreign body. If there is a paper jam, clear the paper jam. Cause: The printer’s internal unit has malfunctioned. Solution: Reinstall the BJ cartridge. Turn the power off and on. Check the service error code and refer to an appropriate solution. Cause: The waste ink tank (absorber) is nearly full. Solution: Replace the waste ink tank (absorber).

Note:

When replacing the waste ink absorber, you need to reset the waste ink volume counter. [Refer to 3-3 Adjustment/Settings (6) Service mode.]

“MEMORY FULL”

Cause: The machine’s memory is full because you tried to copy a very detailed document. Solution: Divide the document and copy each part separately. Cause: The machine’s memory is full because it has received too many documents in the memory

receiving mode. (MP780 only) Solution: Print out any documents, which are stored in memory. Then start the operation again. If the

memory contains any documents yo u d o not need , del et e th em.

“MEMORY CLEARED (PRESS [OK])”

Cause: After receiving data in the memory receiving mode, the power is off due to a service interruption,

etc., and then the image data received in the memory receiving mode is cleared.

Solution: Press [OK] to go back to the standby status.

1 - 7

Memo:

Until you press [OK] button, the machine displays this message continuously and you cannot perform any operations. The memory clear list of the cleared image data is not displayed in this machine. For the other party information, confirm in the communication management report.

1 - 8

2-2 User error code

The error codes that have newly been added starting with the product are identified by the notation “new” those error codes for which remedies unique to the product are offered are identified by the notation “UNQ (UNIQUE).”

No. Tx or Rx Definition Remarks #001 TX

#003 TX/RX #005 TX/RX #009 RX

Document has jammed Document is too long, or page time-over Initial identification (T0/T1) time-over Recording paper has jammed or the recording paper has run out

#011 RX #012 TX #018 TX/RX #021 RX

Polling reception error The other party has run out of recording paper Auto dialing transmission error The other party has rejected the machine during polling reception

#022 TX #037 RX

Call fails Memory has overflowed when receiving images

#085 TX

Other party does not support ITU-T Color Faxing

#995 TX/RX

Memory Communication reservation

2-3 Service Call Errors

No. Tx or Rx Definition

##100 TX

##101 TX/RX

##102 TX ##103 RX ##104 TX ##106 RX ##107 RX ##109 TX

cancellation

The number allowed for retransmission of the procedure signal was exceeded during transmission The modem speed of the machine does not match that of the other party Fallback is not possible EOL cannot be detected for 5 sec (15 sec if CBT) RTN or PIN has been received The procedure signal cannot be received for 6 sec while in wait The transmitting machine cannot be use fallback After transmitting DCS, a signal other than DIS, DTC, FTT, CFR, and CRP was received, exceeding the permitted number of transmissions of the procedure signal

1 - 9

No. Tx or Rx Definition

##111 TX/RX ##114 RX ##200 RX ##201 TX/RX ##204 TX ##220 TX/RX ##224 TX/RX ##226 TX/RX ##229 RX ##232 TX ##237 RX ##238 RX ##261 TX/RX

Memory error RTN was transmitted During image reception, a carrier is not detected for 5 sec DCN was received through a non-normal procedure Receive DTC without Tx data System error (e.g., main program may have gone away) Fault occurred in the communication procedure signal Stack Pointer Not within RAM Range The recording system became locked for 1 min The IC used to control the encoder malfunctioned The IC used to control the decoder malfunctioned The unit used to control recording malfunctioned System error occurred between the modem and system control board

##280 TX

The number of re-transmissions of the procedure signal has been exceeded

##281 TX

The number of re-transmissions of the procedure signal has been exceeded

##282 TX

The number of re-transmissions of the procedure signal has been exceeded

##283 TX

The number of re-transmissions of the procedure signal has been exceeded

##284 TX ##285 TX ##286 TX ##287 TX ##288 TX

DCN has been received after transmission of TCF DCN has been received after transmitting EOP DCN has been received after transmitting EOM DCN has been received after transmitting MPS After transmitting EOP, a signal other than PIN, PIP, MCF, RTP, or RTN was received

##289 TX

After transmitting EOM, a signal other than PIN,PIP,MCF, RTP, or RTN was received

##290 TX

After transmitting MPS, a signal other than PIN,PIP,MCF, RTP, or RTN was received

##332 TX/RX ##333 TX/RX ##334 TX/RX ##335 TX/RX

Printer control DRAM check error Printer control ROM check error Printer control EEPROM check error Data transmission error between the system control section and printer control section

1 - 10

No. Tx or Rx Definition

##336 TX/RX ##337 RX UNQ ##341 TX/RX UNQ ##342 TX/RX UNQ ##343 TX/RX ##345 TX/RX ##346 TX/RX NEW ##352 RX NEW ##355 RX A motor to lift up for CD-R print is malfunctioned NEW ##356 TX/RX ASF cam sensor error NEW ##357 TX/RX ASF paper feed (AP) position error NEW ##358 TX/RX USB Host VBUS overcurrent error NEW ##359 TX/RX Paper feed position error NEW ##360 TX/RX Paper feed cam sensor error NEW ##361 TX/RX Valve sensor error NEW ##362 TX/RX Motor driver malfunctioned error

BJ head abnormal temperature error BJ head temperature sensor error Maintenance Jet Waste Ink Tank Full Cleaning absorption waste ink capacity full Ink Detection Waste Ink Tank Full BJ cartridge head cleaning error Inside temperature error Printer control EEPROM head information error

##670 TX

In V.8 late start, the V.8 ability was detected in DIS from the other party and, in response, CI was transmitted; however, the procedure failed to advance, causing a T1 time-over condition

##671 RX

In V.8 call arrives, the procedure fails to advance to phase 2 after CM detection, causing a T1 time-over condition

##672 TX

In V.34 transmission, the procedure fails to move from phase 2 to phase 3 and later, causing a T1 time-over condition

##673 RX

In V.34 reception, the procedure fails to move from phase 2 to phase 3 and later, causing a T1 time-over condition

##674 TX

In V.34 transmission, the procedure fails to move from phase 3 or phase 4 to a control channel or later, causing a T1 time-over condition

##675 RX

In V.34 reception, the procedure fails to move from phase 3 or phase 4 to a control channel or later, causing a T1 time-over condition

1 - 11

No. Tx/Rx Definition

##750 TX

In ECM transmission, no significant signal can be received after transmission of PPS-NULL, and the allowed number of procedure signal re-transmissions was exceeded

##752 TX

In ECM transmission, DCN was received after transmission of PPS-NULL

##753 TX

In ECM transmission, the allowed number of procedure signal re-transmissions was exceeded or a T5 time-over (60 sec) condition occurred after transmission of PPS-NULL

##754 TX

In ECM transmission, the allowed number of procedure signal re-transmissions was exceeded after transmission of PPS-NULL

##755 TX

In ECM transmission, no significant signal can be received after transmission of PPS-MPS, and the allowed number of procedure signal re-transmissions was exceeded

##757 TX

In ECM transmission, DCN was received after transmission of PPS-MPS

##758 TX

##759 TX

##760 TX

##762 TX

##763 TX

##764 TX

##765 TX

In ECM transmission, the allowed number of procedure signal re-transmissions was exceeded or a T5 time-over (60 sec) condition occurred after transmission of PPS-MPS In ECM transmission, the allowed number of procedure signal re-transmissions was exceeded after transmission of PPS-MPS In ECM transmission, no significant signal can be received after transmission of PPS-EOM, and the allowed number of procedure signal re-transmissions was exceeded In ECM transmission, DCN was received after transmission of PPS-EOM In ECM transmission, the allowed number of procedure signal re-transmissions was exceeded or a T1 time-over (60 sec) condition occurred after transmission of PPS-EOM In ECM transmission, the allowed number of procedure signal re-transmissions was exceeded after transmission of PPS-EOM In ECM transmission, no significant signal can be received

##767 TX

after transmission of PPS-EOM, and the allowed number of procedure signal re-transmissions was exceeded In ECM transmission, DCN was received after transmission of PPS-EOM

1 - 12

No. Tx or Rx Definition

##768 TX

##769 TX

##770 TX

##772 TX

##773 TX

##774 TX

##775 TX

In ECM transmission, the allowed number of procedure signal re-transmissions was exceeded or a T5 time-over (60 sec) condition occurred after transmission of PPS-EOM In ECM transmission, the allowed number of procedure signal re-transmissions was exceeded after transmission of PPS-EOM In ECM transmission, no significant signal can be received after transmission of EOR-NULL, and the allowed number of procedure signal re-transmissions was exceeded In ECM transmission, DCN was received after transmission of EOR-NULL In ECM transmission, the allowed number of procedure signal re-transmissions was exceeded or a T5 time-over (60 sec) condition occurred after transmission of EOR-NULL In ECM transmission, ERR was received after transmission of EOR-NULL In ECM transmission, no significant signal can be received

##777 TX

##778 TX

##779 TX

##780 TX

##782 TX

##783 TX

after transmission of EOR-MPS, and the allowed number of procedure signal re-transmissions was exceeded In ECM transmission, DCN was received after transmission of EOR-MPS In ECM transmission, the allowed number of procedure signal e-transmissions was exceeded or a T5 time-over (60 sec) ondition occurred after transmission of EOR-MPS In ECM transmission, ERR was received after transmission of OR-MPS In ECM transmission, no significant signal can be received after transmission of EOR-EOM, and the allowed number of rocedure signal re-transmissions was exceeded In ECM transmission, DCN was received after transmission of OR-EOM In ECM transmission, the allowed number of procedure signal re-transmissions was exceeded or a T5 time-over (60 sec)

##784 TX

condition occurred after transmission of EOR-EOM In ECM transmission, ERR was received after transmission of OR-EOM

1 - 13

No. Tx/Rx Definition

##785 TX

In ECM transmission, no significant signal can be received after transmission of EOR-EOP, and the allowed number of procedure signal re-transmissions was exceeded

##787 TX

In ECM transmission, DCN was received after transmission of OR-EOP

##788 TX

In ECM transmission, the allowed number of procedure signal retransmissions was exceeded or a T5 time-over (60 sec) condition occurred after transmission of EOR-EOP

##789 TX

In ECM transmission, ERR was received after transmission of EOR-EOP

##790 RX

In ECM reception, ERR was transmitted after reception of EOR-Q

##791 TX/RX

During an ECM mode procedure, a signal other than a significant signal was received

##792 RX

In ECM reception, PPS-NULL between partial pages cannot be detected

##793 RX

In ECM reception, no effective frame was detected while signals were received at high speed, and a time-over condition occurred

2-4 New Error Codes and Recovery Methods

Those error codes that have been added starting with the product and those error codes for which remedies unique to the product are offered are shown together with causes and remedies, where applicable.

##341 Maintenance jet waste ink capacity full

Solution: Replace the waste ink absorber as follows in the error occurs: (1) Select [7] PRINTER TEST in the service mode and select [5] INK ABS CAPA under the [7], then

input “0”.

(2) Check to make sure that no image exist in memory; then, turn off the power, remove the appropriate

parts, and replace the waste ink absorber.

##342 Cleaning absorption waste ink capacity full

Solution: Replace the waste ink absorber as follows in the error occurs: (1) Select [7] PRINTER TEST in the service mode and select [5] INK ABS CAPA under the [7], then

input “0”.

1 - 14

(2) Check to make sure that no image exist in memory; then, turn off the power, remove the appropriate

parts, and replace the waste ink absorber.

##343 Ink detection waste ink capacity full

Solution: Replace the waste ink absorber as follows in the error occurs: (1) Select [7] PRINTER TEST in the service mode and select [5] INK ABS CAPA under the [7], then

input “0”.

(2) Check to make sure that no image exist in memory; then, turn off the power, remove the appropriate

parts, and replace the waste ink absorber.

##352 Printer control EEPROM head information error

Cause: The EEPROM for printer control is faulty. Solution: (1) Turn off and then on the power.

(2) Turn off the power, and replace the print head. (3) Replace the SPCNT board.

NOTE:

In the presence of ##352, the carriage unit will not move to print head replacement position even when the inner cover is opened. Moreover the carriage will not be locked in position even when the power is turned off. When replacing the print head, be sure to turn off the power, and draw out the carriage before replacement.

##355 Lit-up motor for CD-R print malfunctioned

Cause: In performing a CD-R print, the motor to lift up the carriage shaft is malfunctioned. Solution: (1) Turn off and then on the power.

(2) Check the connection from the SHEET FEED unit to the SPCNT board ass’y (JPM1). (3) Replace the SHEET FEED ASS’Y. (4) Replace the SPCNT board.

##356 ASF cam sensor error

Cause: An error occurs at the ASF cam sensor in the ASF (Auto Sheet Feeder) unit. Solution: (1) To reboot, press [OK] button or turn off and then on the power.

(2) Replace the SHEET FEED ASS’Y.

##357 ASF paper feed (AP) position error

Cause: An error occurs at the AP positioning in the ASF (Auto Sheet Feeder) unit. Solution: (1) To reboot, press [OK] button or turn off and then on the power.

(2) Replace the SHEET FEED ASS’Y. (3) Replace the SPCNT board.

1 - 15

##358 USB Host VBUS overcurrent error

Cause: Overcurrent is applied to the VBUS signal of USB. Solution: (1) To reboot, press [OK] button or turn off and then on the power.

(2) Replace the SPCNT board.

##359 Paper feed position error

Cause: An error occurs at the paper feed positioning. Solution: (1) To reboot, press [OK] button or turn off and then on the power.

(2) Replace the SHEET FEED ASS’Y. (3) Replace the SPCNT board.

##360 Paper feed cam sensor error

Cause: An error occurs at the paper feed cam sensor. Solution: (1) To reboot, press [OK] button or turn off and then on the power.

(2) Replace the SHEET FEED ASS’Y (3)

Replace the SPCNT board.

##361 Valve sensor error

Cause: An error occurs at the valve sensor in the Purge unit. Solution: (1) To reboot, press [OK] button or turn off and then on the power.

Replace the SPCNT board.

(2)

##362 Motor driver malfunctioned error

Cause: The motor driver is malfunctioned due to heating, etc. Solution: (1) To reboot, press [OK] button or turn off and then on the power.

(2)

Replace the SPCNT board.

2-5 Wa rnings

Main body (no LCD indications)

Displayed warning Remarks None None

1 - 16

2-6 Troubleshooting by symptom

Symptom Solution Remarks General

errors

The unit does not power on.

Nothing is displayed.

(1) Check the power cord connection. (2) Check the connection between the SPCNT board (JPSU1) and power supply unit. (3) Replace the power supply unit.

(1) Check the connection between the Operation panel unit and SPCNT board (JPANEL1). (2) Replace the SCANNER unit. (3) Replace the SPCNT board.

Part of the LCD panel does not display anything.

(1) If the test mode can be used, check for faulty dot in LCD display. (2) Check the connection between the Operation panel unit and SPCNT board (JPNL1). (3) Replace the SCANNER UNIT. (4) Replace the SPCNT board

ass’y

The keys do not work.

(1) Check the connection between the SCANNER UNIT and SPCNT board (JPNL1). (2) Replace the SCANNER UNIT. (3) Replace the SPCNT board.

No sound from the speaker (MP780 only)

(1) Check the connection of the speaker and SPCNT board (JSPK1). (2) Replace the speaker.

Printing problems

The paper is not feed properly. (The Paper feed motor does not run.)

(3) Replace the SPCNT board. (1) Check the connection from

the sheet feed unit to the SPCNT board assy (JPM1). (2) Replace the sheet feed unit. (3) Replace the SPCNT board ass’y.

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Printing problems

The paper is not picked up from the auto sheet feeder.

Symptom Solution Remarks

(1) Check the foreign matter in the paper feed section. (2) Check the connection SHEET FEED UNIT to the SPCNT board ass’y (JPM1). (3) Replace the SHEET FEED UNIT. (4) Replace SPCNT board ass’y.

The carriage motor does not run.

(1) Check the connection from the SHEET FEED unit to the SPCNT board ass’y (JPM1). (2) Replace the SHEET FEED unit. (3) Replace the SPCNT board ass’y.

Carriage error (The carriage comes into contact with the push-on plates at the left and right sides, resulting in noise.)

(1) Check if grease adheres to the carriage encoder film. (2) Using lint-free paper impregnated with alcohol, wipe the carriage encoder film with care so as not to scratch the film. (3) If a lot of grease adheres to the carriage, replace the carriage board because grease might be spread to the sensor on the carriage board. (4) Replace the carriage encoder film.

Printing Quality error

• The printer does not at all.

• Printing stops midway.

• Certain colors are not printed.

(1) Remove the print head and re-install it. (2) Carry out nozzle cleaning on the print head five times with the cleaning operation, than visually cheek the test print for non-discharge of ink from nozzle. (Fig. 1-2) (3) Remove and reinstall the print head. (4) Replace the appropriate ink tank. (5) Replace the print head. (6) Replace the SPCNT board ass’y. (7) Replace the purge unit.

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Symptom Solution Remarks

Printing Quality error

Blotches appear Blank ink appear

(1) Remove and reinstall the print head. (2) Carry out nozzle cleaning on the print head five times with the cleaning operation, than visually cheek the test print for non-discharge of ink from nozzle. (Fig. 1-1) (3) Perform print head refreshing, and print out Nozzle check pattern. Visually check the test print for non-discharge of ink from nozzle. (Fig. 1-1) (4) Replace the appropriate ink tank. (5) Replace the print head. (6) Check the connection of the carriage ribbon cable and the SPCNT board. (JHD1, JHD2) (7) Replace the carriage unit. (8) Replace the SPCNT board. (9) Replace the purge unit.

Scanning problems

The document is not fed. (The document feed motor does not run.)

1) Check the connection from the document feed motor to the ADF board ass’y.. (2) Check the connection from the ADF board ass’y and SPCNT board ass’y (JADF1). (3) Replace the document feed motor. (4) Replace the ADF board ass’y. (5) Replace the SPCNT board.

The document slips against the rollers. (Evaluation criteria: Check it visually. Stretched copy image.)

(1) Cleaning the ADF section’s parts. See this

Chapter 4. Cleaning Your Machine

(2) Replace the ADF section's rollers.

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Symptom Solution Remarks

Scanning problems

The Scanning Image Is Abnormal

The document does not separate.

Faulty scanner unit's sensors (The placed document or transported document is not detected.)

Nothing is printed.

1) Check whether the document feed motor is driving all the rollers. (Check for any damaged gears or foreign matter stuck inside.) (2) ) Cleaning the Separate Rollor and RubberSheet. See

Chapter 4. Cleaning your Machine.

(3) Replace the separation roller ass’y and Upper guide ass’y.

1) Check for any faulty sensors while executing the copying operation and test mode. (2) Check the connection from Document sensor and Document edge sensor to the ADF board. (3) Check the connection from the ADF board to the sensor board sub PCB (JADF1). (4) Check the connection from the sensor board (JADF1) and SPCNT board. (5) Replace the Document sensor. (6) Replace the ADF board ass’y. (7) Replace the SPCNT board ass’y.

(1) Check the connection between the contact sensor and SPCNT board (JCCD1). (2) Replace the SCANNER unit. (3) Replace the SPCNT board ass’y.

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Symptom Solution Remarks

The Scanning Image Is Abnormal

Faulty CD-R (MP780 only)

Other

The image has vertical stripes.

The halftone image contains black dots.

The CD-R Tray is not recognized.

(As-received failure) The display appers in English.

(1) Clean the Document glass. (2) Check the connection between the contact sensor and SPCNT board (JCCD1). (3) Replace the SCANNER unit. (4) Replace the SPCNT board ass’y.

(1) Clean the Document glass.

(2) Check whether the document is not skewed.

(3) Check the connection between the SCANNER unit and SPCNT board (JCCD1). (4) Replace the SCANNER unit. (5) Replace the SPCNT board ass’y.

(1) Remove the CD-R Tray, and place the CD-R Tray again. (2) Check the connection between the CARRIAGE UNIT and SPCNT board ASS’Y (JHD1, JHD2). (3) Replace the CARRIAGE UNIT. (4) Replace the SPCNT BOARD ASS’Y. Select the settings of [#8CLEAR]-[ALL] and [#5TYPE] (Type setting) in Service Mode, and turn the power OFF/ON with the power button (Software Power: OFF/ON).

Missing dots

Unstable printing Splashed dots

Figure1-2 Defective Pattern (Sample)

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2-7 Processing Communication Problems (MP780 only)

2-7-1 Initial identification of problems

Since the facsimile must transmit picture information, a transmitter, a receiver and telephone lines are required for this purpose. Transmissions may cause problems if one or more of the there is poor.

Communication

trouble

FAX FAX

Your

customer's

machine

Figure1-3 Communication Trouble

Communication

companion

machine

1 - 22

To process communication problems, first of all, it is necessary to narrow down the cause of the problem. Thus, the procedures appearing below must be checked accordingly.

Start

Does an error appear on the

display?

Is copying

being done?

Do copying

Is copy

picture OK?

Communication problems

exist. Carry out the procedures

on the next page.

YES

Errors show on the display.

error massage page 1-6 error code page 1-9

General error

Page 1-17

Test print

Scanning problem

Page 1-19

Printing problem

Page 1-17

Figure 1-4 Procedures for Initial Identification of Trouble

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+ 102 hidden pages