[CQ] CQ problem on Canon C750

[jose antonio]

Hi,
Have this canon image press C750 printing a dark gray band on one edge on large size papers format SRA 3 ( see attached file).
There is no banding seen when printing on smaller sizes like A4
Work done so far: Checked and cleaned primary and pre transfer coronas and shutters , also checked Black dev housing and Black drum, and laser filter glass. all seems OK.
Anny help much apreciated,
Antonio

[smiley]

Re: CQ problem on Canon C750

Hi first try wire cleaning 3 times under aditional function maintenance. If it doesnt improve clean or replace black primary charging assembly. Btw what is the total count of the machine

[jose antonio]

Re: CQ problem on Canon C750

Hi first try wire cleaning 3 times under aditional function maintenance. If it doesnt improve clean or replace black primary charging assembly. Btw what is the total count of the machine

Hello,

yes allready did that, machine has 500k plus.

btw machine is now giving the eror code E061-0004 when performing auto gradation, or auto color mismatch correction.
you know what that can be?

Checked and cleaned primary and pre-transfer charging assemblys, also cleaned the patch sensor unit..but problem stayed.

[wcanonw]

Re: CQ problem on Canon C750

Hello,

yes allready did that, machine has 500k plus.

btw machine is now giving the eror code E061-0004 when performing auto gradation, or auto color mismatch correction.
you know what that can be?

Checked and cleaned primary and pre-transfer charging assemblys, also cleaned the patch sensor unit..but problem stayed.

E061-0004-05 Potential control laser intensity error
Detection Description Potential difference in Laser Power (LPW40h to LPWDBh) showed 150 V or lower when measuring
VL at potential control.
Remedy [Related parts] R1.00
- Harness between the Laser Interface PCB (UN100/J8 and J9) and the Laser Driver PCB (Bk)
(UN107/J1 and J2)
- Harnesses from the Laser Interface PCB to the BD PCB (Bk)
1. Laser Interface PCB (UN100/J12) to Relay Connector (9P)
2. Relay Connector (9P) to BD PCB (Bk) (UN108/J7530K)
- Laser Scanner Unit (Bk)
- Laser Interface PCB (UN100)
[Remedy] Perform the following in the order while checking whether the error is cleared.
1. If the Dustproof Glass is soiled, clean it with a blower.
2. Check/replace the related harness/cable, connector and parts.
[Reference] After replacement of the Laser Scanner Unit (Bk), execute "Settings/Registration>
Adjustment/Maintenance> Adjust Image Quality> Auto Correct Color Mismatch".

[wcanonw]

Re: CQ problem on Canon C750

Hi,
Have this canon image press C750 printing a dark gray band on one edge on large size papers format SRA 3 ( see attached file).
There is no banding seen when printing on smaller sizes like A4
Work done so far: Checked and cleaned primary and pre transfer coronas and shutters , also checked Black dev housing and Black drum, and laser filter glass. all seems OK.
Anny help much apreciated,
Antonio

Hello, if you can extract the drum unit, could you send a photo of the drum to see what state it is in?

[dekoster]

Re: CQ problem on Canon C750


comes from the drum BK