Aficio 2075 Fusing Problems

[tufbnme]

Here are the part #s for the brackets. Replace the thermistors as well, they can look good but still be bad. (like an old girlfriend)
Old P/Ns - B1404196/7: 14.8 mm
New P/Ns - D0624196/7: 15.3 mm

[tufbnme]

Here are the thermistor #s
OLD PART NO. NEW PART NO.
AW100108 AW100131 Thermistor: Fusing: Middle
AW100109 AW100132 Thermistor: Fusing: Inner Back

[Zia Graphy]

Okay here's the update. I went ahead and rebuilt the fuser. New hot roller, pressure roller, pressure roller bearings, lamps, thermistors, and thermistor brackets. The lamps have updated part #s and they look a little different than the old ones. AX44 0215 - 120V 280W, AX44 0304 - 120V 650W, AX44 0305 - 120V 550W. Also the brackets have new part #'s. D062 4196 - Back, D062 4197 - Middle.

After replacing the parts I still have the same problem, fusing temp drops to 138C over the course of 25+ copies. So I think maybe the PSU isn't supplying enough power to the lamps or perhaps the BCU isn't giving the 5V signal to the PSU. I replace the BCU and PSU (boards off a used machine) and still no change. I did swap the EEPROM on the BCU as per the service manual. Still no luck. My next course of action is to check the connector at the back of the machine where the fuser unit plugs in, and then start checking connections from there to the BCU to look for breaks. I can't believe this problem persists. I'll post the solution when I figure it out in case anyone else runs into this.

In the mean time I'm certainly open to any suggestions!

Could this be a "frimware" problem? My current versions are:
System/Copy B1415211J 1.22.1
Enging B1635127 5.20a:36

[withnail]

If there are 3 lamps on this fuser check that one of the filaments isn't broken. I've had similar issues where the fuser warms up enough with one lamp blown but after a couple of days gave the same code you're having.

Okay here's the update. I went ahead and rebuilt the fuser. New hot roller, pressure roller, pressure roller bearings, lamps, thermistors, and thermistor brackets. The lamps have updated part #s and they look a little different than the old ones. AX44 0215 - 120V 280W, AX44 0304 - 120V 650W, AX44 0305 - 120V 550W. Also the brackets have new part #'s. D062 4196 - Back, D062 4197 - Middle.

After replacing the parts I still have the same problem, fusing temp drops to 138C over the course of 25+ copies. So I think maybe the PSU isn't supplying enough power to the lamps or perhaps the BCU isn't giving the 5V signal to the PSU. I replace the BCU and PSU (boards off a used machine) and still no change. I did swap the EEPROM on the BCU as per the service manual. Still no luck. My next course of action is to check the connector at the back of the machine where the fuser unit plugs in, and then start checking connections from there to the BCU to look for breaks. I can't believe this problem persists. I'll post the solution when I figure it out in case anyone else runs into this.

In the mean time I'm certainly open to any suggestions!

Could this be a "frimware" problem? My current versions are:
System/Copy B1415211J 1.22.1
Enging B1635127 5.20a:36

[mikadonovan]

My next course of action is to check the connector at the back of the machine where the fuser unit plugs in

There is a service bulletin out on this model for SC555's, and part of it suggests to shim the connector on the fuser side with washers for better contact, or replace it.

[tcs04]

I may know this one!

I recall something similar a while ago, there's a small control board behind the bcu related to the pressure lift. If u/s it will cause strange fuser faults including the ones you describe.

Would explian why changing fuser parts doesnt work.

I can't be more specific..... very sorry but I don't have the p to p.

Reason...... I quit in October!.. suppose I'm retired early... WOOHOO!

Let me know if I'm getting senile!