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Brother MFC-8600 b&w laser false jam. Feeds fine, but halts print.

Brother MFC-8600 works great, does not realize paper is feeding fine.

I have an older Brother MFC-8600 with what seems to be a feed detection issue. Every sheet of paper stops about halfway into the machine, with a perfectly clear half page of toner deposited, but never reaching the fuser roller. The machine claims a jam. This started suddenly. The feed roller is clean and sound.

Same result with the front feed slot, same result with a self test page. Everything sounds normal, and I've cleaned and dust blasted everything. Is there a way to diagnose? To repair the paper feed sensor? Probably applies to other Brother MFC (Multi-Function) printers, just to jam a few Brother keywords about paper feed and jamming into this post.

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Service Manual:

https://www.manualslib.com/download/8253...

Download Brother FAX4750 Service Manual

Brother FAX4750: Service Manual | Brand: Brother | Category: Fax Machine | Size: 9.88 MB | Pages: 444

This manual also for: Mfc8600, Mfc8300.

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Cool. But the instructions were wrong for entering maintenance mode

I finally found:

3. MULTI-FUNCTIONAL COPY(MFC):

We have 3 ways to enter in maintenance mode in this printer.

First way:

a. Turn off the printer.

b. Hold menu/function button.

c. Turn on the printer. Don't let your finger go until maintenance appears in display unit.

Next way:

a. Turn on your printer.

b. Press: MENU---START (MONO for inject printer)---UP BUTTON four times (THIS PROCESS SHOULD BE DONE WITH IN 5 SEC)

c. Maintenance will appear in your screen.

Last way:

a. Turn on your Printer.

b. Press: MENU---(Press *,2,8,6,4 number)

c. Maintenance will appear in your Screen.

----------------------------------------------

The error I get is:

88 Paper jam. "Even after the registration sensor has gone OFF, the paper

ejection sensor still stays OFF.)"

So it would seem to be a registration sensor that's falsely giving off.

Using sensor test mode though, it seems fine.

So not fixed yet.

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So I'm stuck at testing the "paper ejection sensor", which seems to be built into the fuser assembly. I know it has it's own PCB, and I know where it is, but can't be sure I'm actuating it. Taking it apart seems infeasible.

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Sensor test works great! I wish all printers had it.

Unfortunately the one sensor I can't test is.... the one sensor I suspect is bad. The sensor is embedded in the fuser roller.

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I was able to test these sensors using the service manual above. "ACSIMILE EQUIPMENT

SERVICE MANUAL

MODEL: FAX4750

MFC8300/8600"

Sensors:

MN - Manual Feed

TN - Toner

RS - First sensor in paper path

PO - Last sensor in paper path just at fuser. Tested with stiff piece cut from heavy plastic food container, jammed in.

MN - Manual feed sensor

All work.

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