MP 2852 and SC-144

**Toner Man** · 04-14-2016

Parts replaced:

IPU
SIO
Controller
CCD w/SBU
Harness from SBU to SIO
Harness from SBU to IPU
Power Supply
Scanning lamp and harness
Front and side door switches
BCU

There is a small board that sits in front of the power supply called a SBD board that has connectors going to the pwr supply, toggle switch, IPU and BCU that I have not replaced and not really sure what other purposes it serves outside of turning power on and off.

Any ideas anyone?

**slimslob** · 04-15-2016

SDB = Shut Down Board. Not sure of the exact function as they no longer have the detailed descriptions. It appears to have 2 small relays on it. I haven't worked on a xx52 recently so can't remember if they have the delayed shutdown or if that was introduced with the xx53. If it has delayed shutdown, then that is what the board is for. Otherwise I would say that it is some type of safety board that will shut the machine down under certain danger conditions.

**kannuki2** · 04-15-2016

Toner man, are you able to output the scanner motor? does the LED light come on?

**ruben** · 04-15-2016

Originally Posted by slimslob

SDB = Shut Down Board. Not sure of the exact function as they no longer have the detailed descriptions. It appears to have 2 small relays on it. I haven't worked on a xx52 recently so can't remember if they have the delayed shutdown or if that was introduced with the xx53. If it has delayed shutdown, then that is what the board is for. Otherwise I would say that it is some type of safety board that will shut the machine down under certain danger conditions.

Delayed shutdown was introduced on the 01 range, I believe.

**Toner Man** · 04-15-2016

The lamp lights up, but I could not find an output check for the scanner motor.

**1stcavvet** · 04-15-2016

I have a mp 2800 that will throw a SC 144 right in the middle of a copy job --- the whole machine will shut down and reboot ---never was able to find a cause.