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  1. #1
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    MXM314 F2-40 toner density sensor trouble error

    f2-40 was intermittant .. every 6 months or so
    Now its daily

    Saw it happen during copies

    ran 25-1 saw dv output go to zero finally!!

    Here is what we have tried.
    PM new drum blade dv and charger unit

    Next we tried new pcu assy and new dv unit

    Removed the DV unit connector from rear frame for inspection . looks good

    now we have replaced the hv block at the back of machine and replaced the transfer roller assy (thinking hv arcing).

    Also notice the charger grid seems to get dirty fast. and i have seen a small band of dv on rear frame of drum (drum and charger has been replaced multiple times for this) when i open side door upon arrival. (another reason i think hv arcing)


    next is pcu board?
    I fix copiers ...Well Sorta

  2. #2
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    Re: MXM314 F2-40 toner density sensor trouble error

    maybe a defective toner motor or a problem with the toner cartridge?...are you using artificial toner or OEM?

  3. #3
    Repair God? not quite 100+ Posts fireater's Avatar
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    Re: MXM314 F2-40 toner density sensor trouble error

    Quote Originally Posted by dwarf View Post
    maybe a defective toner motor or a problem with the toner cartridge?...are you using artificial toner or OEM?
    Nope. Oem toner and toner motor was checked with simulation
    I fix copiers ...Well Sorta

  4. #4
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    Re: MXM314 F2-40 toner density sensor trouble error

    we had the same model with the same symptoms...we replaced everything you have except our machine eventually started giving off a burning smell and we had to replace the Lv Power supply..(if I am remembering correctly)

  5. #5
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    Re: MXM314 F2-40 toner density sensor trouble error

    Quote Originally Posted by fireater View Post
    f2-40 was intermittant .. every 6 months or so
    Now its daily

    Saw it happen during copies

    ran 25-1 saw dv output go to zero finally!!

    Here is what we have tried.
    PM new drum blade dv and charger unit

    Next we tried new pcu assy and new dv unit

    Removed the DV unit connector from rear frame for inspection . looks good

    now we have replaced the hv block at the back of machine and replaced the transfer roller assy (thinking hv arcing).

    Also notice the charger grid seems to get dirty fast. and i have seen a small band of dv on rear frame of drum (drum and charger has been replaced multiple times for this) when i open side door upon arrival. (another reason i think hv arcing)


    next is pcu board?
    . Last week I had 2 of those codes both mxm 314 replaced developer working for now.2nd time around for 1 of them.did sim 25 and values are always within acceptable ranges....... This code is nuts.After hearing everything you have tried,Im thinking maybe the SD card is faulty? Those cards are crap and maybe worth a shot.....

  6. #6
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    Re: MXM314 F2-40 toner density sensor trouble error

    Quote Originally Posted by davebtech View Post
    . Last week I had 2 of those codes both mxm 314 replaced developer working for now.2nd time around for 1 of them.did sim 25 and values are always within acceptable ranges....... This code is nuts.After hearing everything you have tried,Im thinking maybe the SD card is faulty? Those cards are crap and maybe worth a shot.....
    LOL its had an sd card too!
    I fix copiers ...Well Sorta

  7. #7
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    Re: MXM314 F2-40 toner density sensor trouble error

    I think i may try an HV board nexst.. i know the lv powersupply is an issue with that coil/inductor frying but i have done a few of those and this wasnt the symptoms
    I fix copiers ...Well Sorta

  8. #8
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    Re: MXM314 F2-40 toner density sensor trouble error

    Quote Originally Posted by fireater View Post
    LOL its had an sd card too!
    Crap..... thought I was on to something , hope something definitively comes up on this f2-40 stuff

  9. #9
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    Re: MXM314 F2-40 toner density sensor trouble error

    found a scrap machine that runs

    Tried the power supply and hv.. no luck yet .. will keep u posted
    I fix copiers ...Well Sorta

  10. #10
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    Re: MXM314 F2-40 toner density sensor trouble error

    I'm wondering if you manually add toner does it normal up?

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