MX-M453N will send but not receive faxes

**Ray Gates** · 09-10-2013

The fax problem was resolved when I reset the machine to factory defaults. They haven't had an issue since I did that. However I have been called twice for a U6-00 code. The first time it was cleared by the time I got there. Today I got another call that the U6-00 code had popped up again. Since it is after 3:30 they are all gone for the day. I will make the 80 mile trip again in the morning. Anyone hear of the U6-00 code? Is there anyway this may be related to the original fax issue? It doesn't appear to have any connection that I can figure out.

**Akitu** · 09-10-2013

U6-00 is Desk Paper Feed Unit trouble. Reseat your connector from the extra trays to the MCU PWB.

**TechGeek** · 09-10-2014

Originally Posted by mojorolla

I think Dave may be onto something with the VOIP system. Sharp fax kits are not very VOIP friendly. You can try the usual tricks like slowing the baud rate to 9600, change coding to MMR, and turning off ECM. I have had at least 2 instances were the line level was not loud enough to trigger the fax kit, both were after an analog to VOIP conversion.
The newest Sharps have a Digital Line check box which helps with VOIP systems.

What SWS's do you use to change the baud rate and coding? I'm always nervous to change SWS so I want o be certain i'm changing the right ones.