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  1. #1
    Senior Tech 250+ Posts
    C3502 making high pitched noise while idle

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    C3502 making high pitched noise while idle

    A customer called about this a few minutes ago. I've asked her to record it. Has anyone ever heard of something like this? I haven't...


  2. #2
    Service Manager 2,500+ Posts
    C3502 making high pitched noise while idle

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    Re: C3502 making high pitched noise while idle

    Quote Originally Posted by tinfox View Post
    A customer called about this a few minutes ago. I've asked her to record it. Has anyone ever heard of something like this? I haven't...

    no audio file posted.


  3. #3
    Copier Combobulator 500+ Posts
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    Re: C3502 making high pitched noise while idle

    Quote Originally Posted by tinfox View Post
    A customer called about this a few minutes ago. I've asked her to record it. Has anyone ever heard of something like this? I haven't...
    If the noise is still present while the machine is in sleep mode it could be some sort of coil or transformer whine from the power board. If it's only active while the machine is awake I'd check the fans.

    Best bet to run through all the moving things in output check (minus the fusing sleeve) and see if you can get it to change or repeat.


  4. #4
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    C3502 making high pitched noise while idle

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    Re: C3502 making high pitched noise while idle

    Quote Originally Posted by Phil B. View Post
    no audio file posted.
    Haven't gone there yet. I may tomorrow.


  5. #5
    Service Manager 2,500+ Posts
    C3502 making high pitched noise while idle


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    Re: C3502 making high pitched noise while idle

    If the sound is when idle most likely a fan or could be the HDD bearing failing.


  6. #6
    Trusted Tech 50+ Posts Ropariva's Avatar
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    Re: C3502 making high pitched noise while idle

    There is a bulletin re a squeal in the exit unit.
    A black style bushing has been replaced by a white nylon one as well as some changes to earth plates. Field fix is to apply Teflon spray lube to the shaft and bushing. Had a number of earlier machines do this. Factory has applied the fix to later machines.

    Try putting machine into “Silent Mode” to confirm. This stops the exit and fuser and many fans when idle.
    It’s a quick fix. The bush is behind a gear plate(4 screws) and under a one way gear.


  7. #7
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    Re: C3502 making high pitched noise while idle

    Too much speculation without hearing it, could be anything. However, I could say what are the most likely, based on past mpc's noises. Most common, noisey squealing pcu, generated from worn cleaning blade on the drum or a seized bearing on the drum shaft. Rotate each drum by hand, it will be obvious, which one is the culprit. Seized bearing on the fuser, or finaly, laser noise.


  8. #8
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    Re: C3502 making high pitched noise while idle

    Check filters and fans and if good try to recreate how/when it gets loud


  9. #9
    Senior Tech 100+ Posts FrohnB's Avatar
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    Re: C3502 making high pitched noise while idle

    Tinfox,
    Did you ever find the solution for this? I think I may have the same noise. Only occurs during warm-up/ idling. Really high-pitched constant sound. Have checked the fans in output mode with none of them making the noise, removed exit section and cleaned/lubed shafts/ bushings. Lubed the P.R. Bearings and drive gear bearings in fuser, and replaced fuser sleeve. Had a torn transfer belt, so I replaced that and while I was in there lubed all the bushings in transfer unit. This one is driving me NUTS!!


  10. #10
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    C3502 making high pitched noise while idle

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    Re: C3502 making high pitched noise while idle

    201808151647-1.pdf



    I've had the spring plates in the paper exit do exactly what you're saying. Took me hours to figure out. I attached a file with the parts highlighted if it loads. If not it's on page 126 of the 3502 parts manual. Hope this helps.


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