Canon GP405, GP605, GP160, Gp-335, Gp-605v Service Bulletin gp405-10

...

Service Bulletin

Issued by Canon Europa N.V.

COPIER

Model :

Location :

Subject :

Reason :

GP405/335

SERVICE MANUAL (FY8-13FV-000)

UPDATING IMAGE BASIC ADJUSTMENT PROCEDURE

No.:

DATE:

GP405-010 (FF-T01-J7-000028-01)

10.09.99

The descriptions for the “Image Basic Adjustment Procedure” found on p. 14-3 of the Service Manual (FY8-13FV-000) are not adequate, requiring modification. Reference:

In the case of a digital copier, the following mechanisms are employed to enhance the reproduction of images:

1. edge emphasis processing

2. density processing As a result, the overall density of images tends to appear higher (darker) when compared with the density of images produced by an analog copier.

Details :

For specific changes, see the pages that follow.

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1 Making Initial Checks

GP405-010

Conditions for Mak ing I m age A djus tm e nts

1. Be sure to use copy paper fresh out of package. (Moist paper will ma ke e valuation of image qu ality difficult.)

2. Be sure to use copy paper with a high degree of whiteness.

3. If possible, be sure to use A3 paper.

Execute ‘roller cleaning’, which is unde r

‘ADJUSTMENT/CLEANING’ of user mode.

Reference:

Execute cleaning for the following:

1. Primary charging roller

2. Transfer charging roller

Clean t he se paration static eliminato r.

Is the setting

of ‘density correction’, which

is under ‘A DJ USTMENT/CLEANING’

of use r mode, at the

middle?

Yes

Is the se tting of

ADJUST>DENS>DENS-ADJ

of service mode ‘5’?

Output Con dition

F value = 5



Set it to the

middl e.

Set it to ‘5 ’.

Using the NA3 Test Chart, make 2 copies in the following mode:

1. text mode Refere nce: At the optimum density, the copy sh ould barely

show gray scale No. 10.

Generate 2 each of the following test prints: COPIER>TEST>PG

1. TYPE 4 (solid w hite )

2. TYPE 5 (halftone)

3. TYPE 6 (solid black)

If only the copy images have a fault,

Go to

2 Checking the Scanner Side (1/2)

Items under COPI ER> ADJUST of se r vice m ode

1. AE>AE-TBL

2. DEVELOP>DE-DC

3. DEVELOP>DE-NO-D

4. DEVELOP>DE-OFST

5. HV-PRI>P-DC

6. HV-PRI>P-NO-DC

7. HV-PRI>OFST1-DC

Yes

Are the seven

items on the left in service

mod e identical to those

indicated on the service

label?

Yes

Ente r the

settin gs

indicated on

the service

label.

If the test print images have faults,

Go to

4 Checking the Printer Si de ( 1 / 3)

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2 Checking the Scanner Side (1/2)

Check/clean the following; if the scanning lamp has reached the end of its life, replace it:

1. mirrors 2. lens

3. standard white plate 4. copyboard glass

5. dust-proo fing glass 6. scanning lamp

7. reflecting plate

Make a copy in text mode.

GP405-010

Are there

vertical lines in the

image?

Yes

Execute the following in service mode: COPIER>FUNCTION>CCD>CCD-ADJ. For detailed instructions, see the Service Manual.

Are there

vertical lines in the

image?

Yes

Execute the following in service mode: COPIER>FUNCTION>CCD>MAN-ADJ. For detailed instructions, see the Service Manual.

Are there

vertical lines in the

image?

Yes

Go to

4 Checking the Printer Si de ( 1 / 3)

Is the wh ite

background of the copy

foggy?

Yes

Execute the following in service mode:

COPIER>FUNCTION>CCD>CCD-ADJ.

Is the image foggy?

Yes

Go to

6 Checking the Printer Si de ( 3 / 3)

Is the

density of the copy image

normal?

Change the setting of the following in service mode: COPIER>ADJUST>DENS>DENS-ADJ.

If the density is too high (dark), decrease the setting.

If the dens ity is to o low (light), increase the setting.

Is the

density of the copy image

normal?

Yes

Make a copy in AE mode.

Is the

density of the copy image

normal?

Change the setting of the following in se rvice mode: COPIER>ADJUST>AE>AE-TBL.

If the density is too high (dark), decrease the setting.

If the dens ity is to o low (light), increase the setting.

End.

Yes

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+ 4 hidden pages