Brother HL-4070CDW Service Manual

This was added on Tue Apr 26 2011 by Bob.

Brother HL-4070CDW Service Manual Contents

Home : Computer Printers : Brother : HL Models : Color Laser Printer

Troubleshooting, Periodical Maintenance, Disassembly and Assembly, Adjustments and Updating Settings Required After Parts Replacement, Service Functions, Circuit Diagrams, Wiring Diagram


File Size 11.2 MB


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Brother HL-4070CDW Service Manual

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* Brother HL-4070CDW Parts Reference List Color Laser Printer
Frame Unit, Drive, Laser Unit, Paper Feeder, MP Unit, DX, Paper Tray, Fuser Unit, Paper Eject, Covers & Labels, Main PCB, Engine PCB, LVPS, HVPS, AC Cord, Accessories, Packing Materials, Periodical Maintenance Part


* Brother HL-4070CDW Service Update P1218-1
Fuser Unit Replacement


* Brother HL-4070CDW Service Update F1217 P1219 Engine PCB Flat Cable Connectors
When removing the Engine PCB extra care needs to be taken while disconnecting the flat cables. The flat cables should be removed slowly and straight out. Rough handling of the flat cables while disconnecting may damage the connector (as shown in Fig B) requiring replacement of the Engine PCB (LM9175001). When inserting the flat cables ensure the flat cables go straight into the connector and not at an angle.


* Brother HL-4070CDW Service Update P1224 Colored Dots, White Dots or Specs Printed Every 75mm
Symptom: Colored Dots or White Dots or Specs are printed every 75 mm on the page., Possible cause: There is dirt and or dust on the surface of the drum unit’s rollers. Please keep in mind that since this is a color laser machine it will have four separate rollers and the dirt of dust could be on one or all of the rollers. To confirm that the dirt or dust is on the drum units rollers we need to look for a patterns in the dots that appear on the printed page. Since the drum unit rollers have circumferences of 75 mm this will result in the dot or spec to appear several times on the page with that approximate spacing as shown in the following image.


* Brother HL-4070CDW Service Update P1225 Print Unable 20
Symptom: The machine displays "Print Unable 20", Possible cause: The Laser Unit has experienced a Laser Diode Failure.


* Brother HL-4070CDW Service Update P1226 Print Unable 21
Symptom: The machine displays "Print Unable 21", Possible cause: The Laser Unit has experienced a Laser Diode Failure.


* Brother HL-4070CDW Service Update P1227 Print Unable 22
Symptom: The machine displays "Print Unable 22", Possible cause: The Laser Unit has experienced a Laser Diode Failure.


* Brother HL-4070CDW Service Update P1228 Print Unable 23
Symptom: The machine displays "Print Unable 23", Possible cause: The Laser Unit has experienced a Laser Diode Failure.


* Brother HL-4070CDW Service Update P1229 Print Unable 71
Symptom: The machine displays "Print Unable 71", Possible cause: The Laser Unit has experienced a Polygon Motor Failure.


* Brother HL-4070CDW Service Update P1230 Print Unable 72
Symptom: The machine displays "Print Unable 72", Possible cause: The Laser Unit has experienced a Polygon Motor Failure.


* Brother HL-4070CDW Service Update P1231 Print Unable 73
Symptom: The machine displays "Print Unable 73", Possible cause: The Laser Unit has experienced a Polygon Motor Failure.


* Brother HL-4070CDW Service Update P1232 Glossy Lines, Shiny Lines, Wheel or Heat Marks, Indentation
Symptom: Glossy Lines; Shiny Lines; Wheel or Heat Marks; Indentation when printing, Possible cause: Incorrect Media being used or there is a concern with the Fuser Unit.


* Brother HL-4070CDW Service Update P1235 Colored Dots, White Dots or Specs Printed Every 62.8mm
Symptom: Colored Dots, White Dots or Specs are printed every 62.8 mm on the page., Possible cause: There is dirt and or damage to the surface of the toner cartridge developer roller. To confirm that we have a bad toner cartridge we need to look for a pattern in the dots that appear on the printed page. Since the developer roller in the toner cartridge has a circumferences of 62.8 mm this will result in the dot or spec to appear several times on the page with that approximate spacing as shown in the following image, based on the color of the dot’s or spec’s, that would be the color toner that needs to be replaced.


* Brother HL-4070CDW Service Update P1237 Very light, washed out or faint printing in monochrome mode only.
Symptom: When printing in Monochrome mode, the print outs are very light, washed out or faint, but works fine when printing with some color., Possible cause: If this is happing in regular color printing, check the toner save mode, make sure it’s turned OFF. If the issue only happens with printing in monochrome mode, the machine has a problem with the Friction CAP installed.


* Brother HL-4070CDW Service Update P1238 Drum Error - Unable to remove drum unit from the machine
Symptom: Customer reports a "DRUM ERROR" on the display of the printer or the drum unit cannot be removed from the machine., Possible cause: Drum unit seated improperly. The cam that locks the drum unit in place may be damaged as a result of the drum unit misalignment. Broken corona wire on the drum unit.


* Brother HL-4070CDW Service Update P1251 No Power, blank display on the machine
Symptom: Brother machine exhibits no power symptoms (machine may be completely dead or has experienced a partial failure with fan or other noises present and a blank display)., Possible cause: Damage to the Main PCB as a result of an incorrect DIMM installation. Main PCB failure. Low voltage power supply failure.


* Brother HL-4070CDW Service Update P1252-1
Main Board Replacement Procedure


* Brother HL-4070CDW Service Update P1288 Paper cassette jams caused by Front Cover Assembly
Symptoms: Skewed print or paper jams from the cassette tray (duplex or simplex). Paper leaves the paper cassette, but jams in the front cover area. MP tray works properly., Possible cause: Paper out of specifications, Maintenance issues (dirt, etc), Paper fragments stuck in front cover assembly, Front cover assembly is defective


* Brother HL-4070CDW Service Update P1292_EN Print Unable 2A or No Waste Toner error
Symptoms: Print Unable 2A or No Waste Toner error on the display., Possible cause: Firmware upgrade required, Waste Toner Box defective or missing, Waste toner sensors defective, Belt Cleaner Release Assembly defective


* Brother HL-4070CDW Service Update P1307 Print Unable 32
Symptom: Print Unable 32, Possible cause: Foreign material in belt unit area, Belt Unit damage or failure of Transfer HVPS or Engine PCB.


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Service or repair manuals are used to help you diagnose and repair the Color Laser Printer most of these have disassembly diagrams, schematic diagrams and the parts list of the device. These should be used with caution and with care as repairing any electronic and electrical items can be dangerous.


Schematic diagrams or circuit diagrams are also used to help you with repairing the Color Laser Printer most of the time these are found inside the service manuals.


Owner/User documents are used for operating the Color Laser Printer, most are free downloads available from the manufactures web site. We link to these and they are here for your convenience so you can find all the manuals for the device in one place.


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