Parts Replacement Developing Unit

Service Tasks

　

○Purpose :  Here, you will learn about the tasks that the service person carries out to ensure a specific level of machine performance.

　

　

●Outline

Take a look at the following table to find out about the tasks the service person is expected to carry out for the image formation system;

for a fuller explanation, click the applicable item:

Item Description 1 Parts replacement click for a fuller explanation of the work to perform after replacing parts. 2 Maintenance servicing click for a fuller explanation of the work to perform as part of maintenance servicing. 3 Troubleshooting click for a fuller explanation of remedies against service-level errors and simple image faults. 4 Points to note about servicing click to find out about what to do and what not to do about servicing work.

　

　

1. Parts Replacement

When replaced, some parts of the machine require adjustment or counter initialization in service mode.

Go through the following for those parts that require special work (e.g., adjustment) upon replacement:

　

■Drum Unit

1) APVC Correction

The thickness of the coating of the photosensitive drum differs from drum to drum. If you have replaced the drum unit, you will have to execute APVC correction.

(For details, see the descriptions given for APVC correction.)

1) Connect the power plug to the power outlet, and turn on the main power switch.

2) Start service mode, and make the following selections: COPIER>FUNCTION>DPC>D-GAMMA.

3) Press the OK key.

　∙ The machine will pick up paper from cassette 1. (The size of paper inside the cassette is irrelevant.)

　∙ If there is no paper inside cassette 1, the machine selects the cassette below it.

　∙ The machine discharges the paper (blank) to automatically end APVC correction.

4) Press the Reset key twice to end service mode.

　

■Developing Unit

1) Feeding and Stirring Toner

A new developing unit is empty. If you have replaced the developing unit, you will have to supply it with toner; once toner is inside, you will then have to stir the toner for a specific period of time so that it is charged to a specific potential.

Make the following selections in service mode to supply and stir toner:

　COPIER > FUNCTION > INSTALL > STIR-K

　

2) Resetting the Developing Cylinder Life Counter

If you have replaced the developing cylinder, you will have to reset the developing cylinder life counter so that the count will start anew.

Make the following selections in service mode to reset the counter:

　COPIER > COUNTER > DRBL-1 > DVG-CYL

The test copies made immediately after the toner has been stirred may carry a small amount of toner on the back (stray toner inside the machine). Make 3 or so copies, as subsequent copies will be free of such soiling.

　

■Transfer Roller

If you have replaced the transfer roller, you will have to reset the transfer roller life counter so that the count will start anew.

Make the following selections in service mode to reset the counter:

　COPIER > COUNTER > DRBL-1 > TR-ROLL

■Static Eliminator

If you have replaced the static eliminator, you will have to reset the static eliminator life counter so that the count will start anew.

Make the following selections in service mode to reset the counter:

　COPIER > COUNTER > DRBL-1 > SP-SC-EL

Each life count is kept in memory on the DC controller PCB. If you have to replace the DC controller PCB, be sure to enter the count that has been read of the previous PCB.

　

 

2. Maintenance Servicing

The service person is expected to replace, clean, or inspect the following parts on a periodical basis.

Perform the appropriate work by referring to the indicated intervals:

　

Item	Parts name	Work	Interval	Remarks
Periodically replaced parts	-	-	-	The image formation system does not have parts that must be replaced on a periodical basis.
Durables	Transfer roller	replace	every 150,000 prints
	Static eliminator	replace	every 150,000 prints
	Developing cylinder	replace	every 480,00 prints
	Waste toner box (iR2270/2870)	check	every 75,000 prints	If the waste toner box is full or nearly full upon inspection, replace the waste toner box.
	Waste toner box (iR3570/4570)	check	every 85,000 prints
Scheduled servicing	Transfer/feed guide assembly	clean	every 120,000 prints	Dry wipe with lint-free paper.
	Photosensitive drum butting spacer/feed guide	clean	every 120,000 prints	Dry wipe with lint-free paper.

 If the transfer roller arm is used beyond its indicated replacement interval, leakage current from transfer can start to burn the arm.

3. Troubleshooting

■E020-0000 (toner feedscrew fault)

If there is a fault in the toner feedscrew, go through the following to correct it:

1) Check the connectors between the sub hopper feedscrew motor or the toner sensor and the DC controller.

2) Check the toner feedscrew drive parts for damage.

3) Replace the sub hopper feedscrew motor.

4) Replace the developing unit toner sensor or the sub hopper toner sensor.

5) Replace the DC controller PCB.

　

■E190-0000 (waste toner box full error)

In the event of a waste toner box full error, reset the printer unit by performing either of the following:

∙ Replace the waste toner box.

　

■If a toner absent error (with a message prompting the replacement of the toner cartridge) occurs even

after replacement of the toner bottle with a new one, go through the following:

1) Check the connectors between the toner bottle rotation motor (M5) and the DC controller.

2) Check the toner stirring plate drive parts for damage.

3) Replace the toner bottle rotation motor (M5).

4) Replace the hopper unit.

5) Replace the DC controller PCB.

　

■Cyclic Soiling

The presence of a scratch or dirt on any of the rollers of the image formation system will show as a cyclic image fault. If there is such a fault, refer to the interval to identify the fault.

The following table shows the intervals associated with the individual rollers. Make use of the table to quickly identify the cause (roller).

　

Parts name	Fault type	Interval	Remedy
Primary charging roller	cyclic soling (face)	about 50 mm	Replace the drum unit.
Photosensitive drum	cyclic soiling (face)	about 94 mm	Replace the drum unit.
Developing cylinder	cyclic soiling (face)	about 63 mm	Replace the developing cylinder or the developing unit.
Transfer charging roller	cyclic soiling	about 50 mm	Replace the transfer charging roller.

　

　

　

4. Points to Note About Servicing Work

■Points to Note When Handling the Drum Unit

∙ Take care not to touch or leave scratches on the surface of the photosensitive drum in the drum unit.

■Points to Note When Handling the Developing Unit

∙ Take care not to touch or leave scratches on the surface of the developing cylinder in the developing unit.

∙ If you are replacing the developing cylinder, be sure to provide measures to prevent soiling with toner.

      (The toner inside the developing unit may spill out of the unit.)

■Points to Note When Handling the Transfer Charging Roller

∙ When holding the transfer charging roller, do not touch or push its rubber portion.

■Points to Note When Removing the Toner Bottle

∙ When you release the bottle locking lever and pull the toner bottle out of the machine, there will likely be a gap around the mouth at the tip of the bottle. If you are doing so when the bottle has become completely empty, there will be no problem. If the bottle contains an appreciable amount of toner, however, be sure to observe the following to avoid spilling of the toner. (The user must also be aware of this fact.)

1) When pulling out the toner bottle, take care not to hit the toner outlet. 2) After pulling out the toner bottle, do not hold it upside down.