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Thread: HP DJ T795

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    HP DJ T795

    After permanent error all printheads colleague swapped complete carriage assembly (include PCA and line sensor) without success. Line sensor calibration fails. Carriage Assembly Test: 55:11 No Vpp0 and no Vpp1. Measure up Trailing Cable without finding. Other idee than EE Box? Spezial issue? It's my first T795 I've ever seen. Thanks advance for help.

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    Re: HP DJ T795

    You probably have a bad or damaged trailing cable; I would replace that first. And if that doesn't do it, then the electronics module WITH the power supply.

    In retrospect, always replace the least expensive part in the chain first.

    Kiran

    PS - Was it a new carriage assembly? Or used?

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    Re: HP DJ T795

    [QUOTE=Kiran

    PS - Was it a new carriage assembly? Or used?[/QUOTE]


    Good question. I'll ask my colleague after his holiday.

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    Re: HP DJ T795

    Quote Originally Posted by Kiran Otter View Post

    PS - Was it a new carriage assembly? Or used?

    It was new. Is there no possibility for measuring?
    Last edited by CP-1015; 07-20-2021 at 07:54 PM.

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    Re: HP DJ T795

    You mean like checking for voltages at the carriage? You can, but with the nature of the trailing cable constantly being flexed, you may get voltages at one carriage position, and not at another. Plus replacing the trailing cable is pretty simple, and a generic trailing cable is cheap (vs the actual HP part which is stupidly expensive.)

    In my experience the electronics module is the most common failure; either the module itself or the power supply, or both together. Then the trailing cable, and last the carriage. But anything's possible. All 3 could fail together.

    Kiran

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    Re: HP DJ T795

    Quote Originally Posted by Kiran Otter View Post
    You mean like checking for voltages at the carriage? You can, but with the nature of the trailing cable constantly being flexed, you may get voltages at one carriage position, and not at another. Plus replacing the trailing cable is pretty simple, and a generic trailing cable is cheap (vs the actual HP part which is stupidly expensive.)

    In my experience the electronics module is the most common failure; either the module itself or the power supply, or both together. Then the trailing cable, and last the carriage. But anything's possible. All 3 could fail together.

    Kiran
    Ok, thank you! But if measuring on the mother board - where trailing cable is connected?

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    Re: HP DJ T795

    I don't know. In all my years of repairing Designjets, I've never had to determine a problem that way. I wouldn't trust it to supply voltage to something, find a problem, but keep the voltage applied rather than turn it off. Maybe someone else can offer some ideas along those lines.

    In some models there are LEDs to indicate voltages. There is one on the carriage I believe on the T-series, that's about the only indication there is.

    Kiran

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    Re: HP DJ T795

    Quote Originally Posted by Kiran Otter View Post
    You mean like checking for voltages at the carriage? You can, but with the nature of the trailing cable constantly being flexed, you may get voltages at one carriage position, and not at another. ...

    Kiran
    I suppose that you could clip onto the ribbon contact at each end of the ribbon cable, set you're meter to tone, then repeatedly slide the carriage through it's entire range of movement .. but you're going to spend a lot of time doing this, then not be entirely sure if the cable is good or not.

    I have tried this and was not entirely satisfied with the results. =^..^=
    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.
    3) if you're going to ask about jams include the jam code.
    4) if you're going to ask about an error code include the error code.
    5) You are the person onsite. Only you can make observations.

    blackcat: Master Of The Obvious =^..^=

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    Re: HP DJ T795

    For $15, just replace the cable.

    Kiran

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    Re: HP DJ T795

    Now I swapped trailing cable. Before any justage:
    22.0:10
    Error-Code 0x10503005
    Error: unavailable
    File: -threadx-opt/elektra/hal/motors/BPA/elektra/BPSStateMachine.cpp
    Line-number: 327

    I'd performe IDS/Ink Delivery System.
    22.0:10 again. Shell I perform Ink Supplies and Leckage, too?
    Thanks advanced.

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