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  1. #1
    Senior Tech 100+ Posts
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    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
    Attached Images Attached Images

  2. #2
    Field Supervisor 500+ Posts smiley's Avatar
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    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
    there is no glory without sacrifice

  3. #3
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    Re: CQ problem on Canon C750

    Quote Originally Posted by smiley View Post
    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.

  4. #4
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    Re: CQ problem on Canon C750

    Quote Originally Posted by jose antonio View Post
    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".

  5. #5
    Senior Tech 250+ Posts
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    Re: CQ problem on Canon C750

    Quote Originally Posted by jose antonio View Post
    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?

  6. #6
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    Re: CQ problem on Canon C750

    Quote Originally Posted by jose antonio View Post
    Hallo,
    habe diese Canon Image Press C750 zum Drucken eines dunkelgrauen Streifens an einer Kante auf großformatigen Papieren im Format SRA 3 (siehe angehängte Datei).
    Beim Drucken auf kleineren Formaten wie A4 ist keine Streifenbildung zu sehen.
    Bisher durchgeführte Arbeiten: Primär- und Pre-Transfer-Koronen und -Verschlüsse überprüft und gereinigt, auch schwarzes Entwicklungsgehäuse und schwarze Trommel sowie Laserfilterglas überprüft. alles scheint in Ordnung zu sein.
    Anny hilft sehr,
    Antonio

    comes from the drum BK

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