Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old February 22nd 10, 06:23 PM posted to sci.electronics.repair
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Default Brother MFC 9420CN Color Laser Printer

I'm trying to repair this multifunction color laser printer / copier /
fax / scanner. The person who gave it to me indicated it needed a new
OPC belt. Sure enough, when powered up it gives a message "No OPC
Belt. Install OPC Belt" Unusual, the normal message is "Replace OPC
belt". Once I found out how to replace the OPC belt, I discovered the
belt was already present. And I discovered the tension release pins
on the belt cartridge were still inserted (they are to be removed
before installing the cartridge).

Since a new belt costs in excess of $200, I would prefer to establish
the cause of the error message before spending that much money. There
are no obvious pressure or optical switches to detect the presence of
the OPC belt. Does anyone have any experience servicing these?

PlainBill

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Old February 22nd 10, 08:13 PM posted to sci.electronics.repair
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Default Brother MFC 9420CN Color Laser Printer

That means the photodiode or whatever they are using to detect the presence
of the opc belt is not being triggered. Could be toner on the sensor, or
the release pins may be somehow preventing the detection.




wrote in message
...
I'm trying to repair this multifunction color laser printer / copier /
fax / scanner. The person who gave it to me indicated it needed a new
OPC belt. Sure enough, when powered up it gives a message "No OPC
Belt. Install OPC Belt" Unusual, the normal message is "Replace OPC
belt". Once I found out how to replace the OPC belt, I discovered the
belt was already present. And I discovered the tension release pins
on the belt cartridge were still inserted (they are to be removed
before installing the cartridge).

Since a new belt costs in excess of $200, I would prefer to establish
the cause of the error message before spending that much money. There
are no obvious pressure or optical switches to detect the presence of
the OPC belt. Does anyone have any experience servicing these?

PlainBill


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Old February 23rd 10, 09:58 PM posted to sci.electronics.repair
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First recorded activity by DIYBanter: May 2009
Posts: 98
Default Brother MFC 9420CN Color Laser Printer

On Mon, 22 Feb 2010 15:13:59 -0500, "circuit"
wrote:

That means the photodiode or whatever they are using to detect the presence
of the opc belt is not being triggered. Could be toner on the sensor, or
the release pins may be somehow preventing the detection.



My idea also. However, the presence of a microswitch is non-obvious,
and there are no signs of optical sensors present. Or maybe I've been
barking up the wrong tree. I've been thinking in terms of a detector
that would be blocked by the cartridge. Perhaps a reflective sensor
that detects the presence of a cartridge. Thanks, some good ideas.

PlainBill


wrote in message
.. .
I'm trying to repair this multifunction color laser printer / copier /
fax / scanner. The person who gave it to me indicated it needed a new
OPC belt. Sure enough, when powered up it gives a message "No OPC
Belt. Install OPC Belt" Unusual, the normal message is "Replace OPC
belt". Once I found out how to replace the OPC belt, I discovered the
belt was already present. And I discovered the tension release pins
on the belt cartridge were still inserted (they are to be removed
before installing the cartridge).

Since a new belt costs in excess of $200, I would prefer to establish
the cause of the error message before spending that much money. There
are no obvious pressure or optical switches to detect the presence of
the OPC belt. Does anyone have any experience servicing these?

PlainBill




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