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.
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.
由 prop man 完成的
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.
由 Bryce Nesbitt 完成的
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.
由 Bryce Nesbitt 完成的
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.
由 Bryce Nesbitt 完成的
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.
由 Bryce Nesbitt 完成的