02_error codes.pdf part of Xerox Phaser 740 740.part1.rar, wanted service manual text manual preview

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Error Codes and Messages
Error messages
Generally, the top line of the two-line front panel display indicates the printer's status, such as Ready, Printing, Busy, or Stopped. The bottom line indicates the function of the three buttons located immediately below the LCD. The front panel also displays error codes when it encounters certain system failures. These error codes are discussed in the next topic. When an error code first occurs, cycle power on the printer to see if the error re-occurs.

Print engine error codes
The following table list the engine failure codes that may be displayed on the printer's front panel during normal printer operation.

Print engine service error codes
Error code 1, 2, 3, 4 Meaning of error code and what to do about it Black, Cyan, Magenta, Yellow (respectively) toner cartridge movement error. 1. Push the indicated toner cartridge toward the imaging unit. Does it require more force to push that cartridge than the other toner cartridges? 2. Inspect the wiring harness leading from the toner cartridge selector/eject unit to CN6 of the engine control board. 3. Check the cam motors for proper operation toner cartridge selector/eject. 4. Inspect the cam motor drive gears in the toner cartridge selector/eject. 5. Check the cam motor flags and sensors toner cartridge selector/eject. 6. Replace the toner cartridge selector unit. 7. Replace the indicated toner cartridge. 05 Toner cartridge/fuser fan error. 1. Is +24 VDC being supplied to the fan from the engine control board's CN24 pins 1 and 2? If it is, replace the fan. If not, replace the engine driver board. 10 Laser scanner motor unlocked. 1. 2. 3. 4. 5. Inspect the wiring harnesses leading to the laser scanner. Replace the laser motor drive board. Replace the laser scanner. Replace the engine control board. Replace the power supply.

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Print engine service error codes
Error code 11 Meaning of error code and what to do about it Laser down. 1. Replace the laser motor drive board. 2. Replace the laser scanner. 3. Replace the engine control board. 12 L-sync over time. 1. Inspect the wiring harnesses leading from the laser driver board to CN4. CN7, CN8 and CN 29 of the engine control board. 2. Replace the laser motor drive board. 3. Replace the laser scanner. 4. Replace the engine control board. 13 L-sync under time. 1. 2. 3. 4. Cycle printer power and try printing again. Replace the laser motor drive board. Replace the laser scanner. Replace the engine control board.t

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Phaser 740 Color Printer

Print engine service error codes
Error code 20 Meaning of error code and what to do about it High voltage error. Main charge grid charger 1. Ensure that the imaging unit is properly installed and locked in place. 2. Ensure the main charge grid is properly installed. Ensure the main charge grid is clean with no foreign matter in the area. Also ensure the wire and grid plate are in good condition. 3. Inspect the wiring leading from the high voltage board to the main charge grid. 4. Replace the main charge grid if necessary. 5. Replace the imaging unit. 6. Replace the high-voltage board. First bias transfer roller 1. Ensure that the imaging unit is properly installed and locked in place. 2. Inspect the wiring leading from the high voltage board to the imaging unit. 3. Replace the imaging unit. 4. Replace the high-voltage board. Second bias transfer roller 1. Ensure that the paper feeder is properly installed and locked in place. 2. Ensure the transfer roller is properly installed. Ensure the bias roller makes good contact with its electrical contacts. 3. Inspect the wiring leading from the paper feeder to CN20 of the engine control board. 4. Inspect the wiring leading from the high voltage board to the second bias transfer roller. 5. Replace the high-voltage board. Toner cartridge bias 1. Ensure that each toner cartridge makes good electrical contact with its high voltage bias terminals. 2. Inspect the wiring leading from the high voltage board to the toner cartridge bias terminals. 3. Replace the toner cartridge if a single cartridge is exhibiting trouble. 4. Replace the high-voltage board. 5. Too much conductive grease on the high-voltage contacts of a toner cartridge developer roller has migrated down and shorted to the chassis. Conductive grease should be used very sparingly.

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Print engine service error codes
Error code 21 Meaning of error code and what to do about it Photoconductive belt out of sync with accumulator belt. 1. Ensure that the imaging unit is properly installed and lock in place. 2. Inspect and clean the transparent plastic cover over the accumulator belt position sensor. 3. Inspect the wiring harness leading from the accumulator belt position sensor to CN13 of the engine control board. 4. Replace the imaging unit. 5. Replace the accumulator belt position sensor. 6. Replace the engine control board. 22 Positioning error of the photoconductive belt. 1. Ensure that the imaging unit is properly installed and locked in place. 2. Ensure the tension lever of the imaging unit is set in the locked position. 3. Inspect the wiring harnesses leading in and out of the charger sensor board. 4. Replace the imaging unit. 5. Replace the engine control board. 30 Accumulator belt out of position. 1. Is the imaging unit at the end of its life? 2. Is there toner on the accumulator belt cleaning blade holder? (The holder is located on the imaging unit, along the bottom of the green OPC belt.) 3. Check to see if any toner cartridges are leaking toner. 4. Ensure that the imaging unit is properly installed and locked in place. 5. Inspect and clean the transparent plastic cover over the accumulator belt position sensor. This sensor is located on the interior of the back wall of the chassis. 6. Inspect the wiring harnesses leading in and out of the charger sensor board. 7. Replace the imaging unit. 8. Replace the engine control board. 32 Accumulator belt cleaning blade movement error. If the Error 32 is constant, try: 1. Replace the imaging unit 2. Replace the accumulator cleaner clutch shaft and the cleaning board 3. Replace the engine control board. If the Error 32 is intermittent: 1. Replace the accumulator cleaner clutch shaft and the cleaning board 2. Replace the imaging unit. 3. Replace the engine control board.

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Phaser 740 Color Printer

Print engine service error codes
Error code 33 Meaning of error code and what to do about it Paper transfer roller movement error. 1. Inspect the first drive gear (white joint gear) in the paper feeder. Are any of its teeth broke? 2. Ensure the second bias transfer roller is in its lower position. 3. Check that the transfer roller sensor flag properly interrupts its sensor. 4. Does the transfer roller clutch and stop plate operate correctly? 5. Inspect the wiring harness leading from the paper feeder to CN20 of the engine control board. 6. Replace the paper feeder. 7. Replace the engine control board. 40 Fuser low temperature low error. 1. Is the fuser cold? The thermal fuse may be blown or lamp may be broken. Check the fuse. Replace the fuser. 2. Inspect the wiring harness leading from the fuser to CN25 of the engine control board. 3. Replace the power supply. 4. Replace the engine control board. 41 Fuser high temperature error. 1. Replace the fuser. 2. Inspect the wiring harness leading from the fuser to CN25 of the engine control board. 3. Replace the engine control board. 4. Replace the power supply. 42 Fuser thermistor open. 1. Ensure the fuser is properly installed and firmly seated in place. 2. Replace the fuser. 3. Inspect the wiring harness leading from the fuser to CN25 of the engine control board. 4. Replace the engine control board. 43 Fuser temperature rising too slow error. 1. Remove and reinstall the fuser. Insert it smoothly and solidly, with force, into place. Secure it with its thumbscrew. 2. Ensure the fuser is the correct type for the printer a 220 volt fuser installed in a 110 volt printer produces an Error 43. Replace the fuser. 3. Inspect the wiring harness leading from the fuser to CN25 of the engine control board. 4. Replace the engine control board. 5. Replace the power supply. 50 Power supply fan error. 1. Is +24 VDC being supplied to the fan from the control board connector CN30 pins 1 and 2? If it is, replace the fan. If not, replace the power supply.

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Print engine service error codes
Error code 51 Meaning of error code and what to do about it Filter fan error. 1. Is +24 VDC being supplied to the fan from the engine control board's CN9 pins 1 and 2? If it is, replace the fan. If not, replace the engine control board. 52 Auto-duplex unit fan error. 1. Is +24 VDC being supplied to the fan from the engine control board thru the duplex unit's interconnect connector and wiring harness during duplex printing? If it is, replace the auto-duplex unit. If not, replace the engine control board. 60 Multi-purpose tray pick-up roller motor error 1. Is the tray over-filled. Too much media will overload the motor. 2. Is the multi-purpose tray motor properly connected to the paper feeder connector CN608. Inspect its wiring harness. 3. Inspect the wiring harness leading from the paper feed motor to connector CN20 of the engine control board. 4. Replace the paper feeder. 5. Replace the engine control board. 61 Toner cartridge (sleeve) drive motor lost sync. 1. Are the toner cartridges properly installed in position? 2. Does each toner cartridges developer roller rotate when driven by the motor? If not replace the toner cartridge. 3. Does the toner cartridge motor rotate? Check the toner cartridge motor's wiring harness to the engine control board at CN26. If the wiring checks out, replace the toner cartridge motor. 4. Check the toner cartridge drive gears. 5. Replace the engine driver board. 62 Paper feed motor lost sync. 1. Does the paper feed motor run and generate torque? 2. Does the gear train of the paper feeder rotate properly? 3. Inspect the fuser. Did the fuser roll wrap itself around the fuser's hot roller? 4. Does the gear train of the fuser rotate properly? 5. Does the gear train of the paper eject rollers rotate properly? 6. Inspect the wiring harness leading from the paper feed motor to connector CN20 of the engine control board. 7. Replace the paper feed motor. 8. Replace the engine control board.

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Phaser 740 Color Printer

Print engine service error codes
Error code 63 Meaning of error code and what to do about it Main motor lost sync. 1. Is the imaging unit properly installed and locked in position? 2. Do the photoconductive and accumulator belts rotate when driven by the main motor? Manually turn the main drive gears to rotate the belts of the imaging unit. If the gear is difficult to turn, replace the imaging unit. 3. Inspect the drive gear for missing teeth. 4. Does the main motor rotate? Check the main motors wiring harness to the engine control board at CN15. If the wiring checks out, replace the main motor. 5. Replace the engine driver board. 64 LTA Error. 1. Is the printer correctly installed on top of the lower tray assembly? 2. Ensure that the Lower Tray Assembly is the correct model for the printer. Lower Tray Assemblies for earlier model printers, such as the Phaser 560, will not work with the Phaser 740. 70 Program ROM Checksum error. 1. Replace the engine control board. 2. Replace the engine board NVRAM. 71 Program SRAM Checksum error. 1. Replace the engine control board. 2. Replace the engine board NVRAM. 72 EEPROM Checksum error (ECU). 1. Replace the engine control board. 2. Replace the engine board NVRAM. 73 EEPROM Checksum error (imaging Unit). 1. Replace the imaging unit. 2. Replace the engine control board. 3. Replace the engine board NVRAM. 74 EEPROM Checksum error (fuser). 1. Replace the fuser. 2. Replace the engine control board. 3. Replace the engine board NVRAM. 80 VSYNC time-out. 1. Check connection between the image processor board and the engine control board. 2. Replace the engine control board. 3. Replace the image process board. 81 Power missing error. Engine control board not powered. 1. Check wiring harness CN25 to the engine control board.

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Print engine service error codes
Error code 82 Meaning of error code and what to do about it Serial time-out error. 1. Check the connection between the image processor board and the engine control board. 2. Replace the image process board. 3. Replace the engine control board. 83 Command error. The image processor sent bad data to the engine control board. 1. Reset the image processor NVRAM. 2. Check the connection between the image processor board and the engine control board. 3. Replace the image process board. 4. Replace the engine control board. 84 Parity error. 1. Reset the image processor NVRAM. 2. Check the connection between the image processor board and the engine control board. 3. Replace the image process board. 4. Replace the engine control board.

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Phaser 740 Color Printer

Normal power-up self-tests
This test requires no paper or customer interaction. If a problem is encountered with the image processor's expansion memory or other options, then the information is printed on the printer's startup page. Normal power-up tests take slightly longer than one minute to complete. Any failure not allowing the printer to print the start page are displayed on the printer's front panel with a two-digit hex code indicating what the error is. A two digit hex code with the suffix "p" indicates the failure occurred during normal powerup self test.

Normal power up error codes
Code 10p 11p 13p 1bp 1cp 21p 25p 26p 28p 29p 2bp 2cp 2ap 2fp 1dp 31p 32p 36p 37p 3ap 3bp 47p Power-up test Image Processor CPU Interrupt Instruction ROM Checksum NVRAM Acknowledge PROM Data Font ROM Checksum Write/Read Centronics SCSI Interrupt W/R SCSI Register W/R LCA Registers W/R CDU Register CDU Data Compression CDU Data Decompression DMA Address Test Network Card DRAM DIMM Configuration Base DRAM Address Paths Expansion DRAM Data Paths DIMM1 Data Paths DIMM1 Address Paths DIMM2 Data Paths DIMM2 Address Paths Engine Control Board Status 6. Replace the image processor to engine board cable 7. Replace the engine control board Corrective action 1. Ensure that correct RAM DIMMs, Code ROM SIMM, SCSI card and network card are installed 2. Reset the NVRAM 3. Replace the image processor board 4. Replace the RAM DIMMs Replace the Code ROM SIMM 5. Replace the font SIMM (if installed)

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Phaser 740 Color Printer