[CQ] Mx-2300 colour registration drifting

[Colonel Bogey]

Hi Guys

Hope you can help.
Got an mx2300 which during a copy run, slowly loses yellow registration, which ends up to 2.5cm out . If the machine is switched off and on the symptom disappears initially, but reoccurs again during a copy run.
Is this a transfer belt drive problem ?

[OMD-227]

Check the primary transfer belt drive gear. It sometimes cracks and causes this exact problem. Just dont lose the pin inside.

Is the yellow coverage OK? Is the color missing or just shifting? If its just shifting, its most likely the drive gear. Its big white the gear on the transfer belt unit.

[Colonel Bogey]

Its just shifting, but only on the yellow. Thanks for the advice, i'll be checking that tomorrow. Why does this only affect the yellow ?

[OMD-227]

It usually only affects one color (either CMY). If you run sim 64-01 (A=11, B&C=2, D=255), you will get the 4 block halftone colors across the page. Whenever I've had the cracked drive gear (on any series MX), only one of the CMY colors varies in registration with that testpage, so I'm guessing your's is no different.
Sometimes I've seen a 1.5cm gap between C&M, sometimes its between M&Y. The color drums run on their own single drive motor, the color devs run on their own motor too, so with CMY interlinked, if the belt drive gear is cracked, one of the colors gets bad rego issues.

[JustManuals]

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[Dark Helmet]

As Wazza said the drums are driven off the same motor so they will turn at the exact same rate. The LSU writes the image on the yellow drum first etc etc. If your belt stops for a half a second or jitters or what ever now your registration is out. The belt keeps going and magenta gets it's image written but lets say the belt stopped for 1 mm. Now you have a 1 mm shift and magenta is not going to perfectly overlap yellow because the belt is behind were it should be.