Error code SC542 on MP6500

[Shadow1]

Remember when you could toss a quarter off your wife's belly and it would bounce back?

No.
But I do remember when my wife was pregnant, and my daughter could just about kick a quarter off her stomach.

[stephend]

I have this problem SC 545 and 542's from time to time on different units...starting with 2051's, 2060's...and ending with 6000's. For this new 6001 series I can add another code SC 541. We tried different solutions, turning AOF off, reducing the fuser temp, replacing the thermistors and thermostats, even the new and improved brackets. The majority of the situations are solved by new thermistors...but I have situations where nothing helps...every 2-3 weeks the 542 or 545 is triggered. Neither a brand new fuser it didn't help. It's a shame that we don't have a power line monitor to test the line, because personally I'm suspecting the line...All my accounts with this chronically problem are located in isolated industrial areas and have many appliances installed on the same line.

[Kopyrtek]

I have had good success with replacing the thermistors and lowering the temp by 5 to 10 degrees.Also, i shim the fuser connector with a 1mm shim and turn AOF off.

[Frank12]

Check the fuse at the power supply , 1 fuse blown , & replace it & reset sc code by sp mode

[paulg]

In the UK on the Tech support website they have suggested Japan are to soon release new thermistors.

[stephend]

Thermistors newer than AW10-0109 &0108???

[paulg]

Thermistors newer than AW10-0109 &0108???

I presume so i understood the post as meaning a new set of thermistors was being developed.

[salesux]

Tech Bulletin 13 is specific to SC542 or SC555. They have come out with new brackets for the thermistors. Have you tried the new brackets?

[paulg]

Tech Bulletin 13 is specific to SC542 or SC555. They have come out with new brackets for the thermistors. Have you tried the new brackets?

From what the post was applying the brackets were not working for some cases of sc542-555, so thermistors were being modified. So be intresting to see what happens.

[zed255]

I've tried the new brackets, no real improvement noted for me, just false hope .

[stephend]

Agree with you zed255. No real improvements with this new brackets....I had some accounts where actually is even worst....thermistors start collecting debris in no longer than 2 weeks.
The only "general" solution is to lower the fuser temp, activate the warm up short mode, increase the idle time and replace the damn thermistors...Spokes with somebody from tech support and they are living with the feeling that the problem is solved since the new brackets came out....

[salesux]

I mainly work on the MPC6000/7500's so I haven't tried the brackets. Good to know they don't help. Of course it seems like fuser errors have been normal for the 60 to 75ppm machines for years. No matter the model.

[zed255]

The issue is the chronic nature of the codes coming up, across several product generations and models. I feel the real fix is simply a firmware change that 'relaxes' the apparently too stringent warm-up timing events. Seems like just a few more seconds would make the difference.

[Shadow1]

Problem seems to be the firmware expects the unit to warm up to xx temp in xx seconds without accounting for the initial temp or the line voltage, etc. Thermistor brackets ain't gonna fix that - maybe they'd like to try some updated toner in it - that fixes everything...

[mikadonovan]

Maybe a new thermistor would be the fix. I have noticed as long as the thermistors are reading actual temperature within 5 degrees of each other the machines run well. When this temperature difference is 10 degrees, the machine will throw SC 542's frequently.