ES 7516AC error C471

[barber782]

Hi everyone,

Installed two Toshiba es7516ac's in a school in December 2019. After a few weeks one is getting the error code C471. Which is to do with the fuser, and turned out to be a blown thermistor.
Iv replaced the part and reassembled the fuser sleeve components with plenty of oil.
Now a month later the same error has appeared.
Does anyone know why this would keep happening? Or anyone experiencing the same on these.

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[Phil B.]

Re: ES 7516AC error C471

Hi everyone,

Installed two Toshiba es7516ac's in a school in December 2019. After a few weeks one is getting the error code C471. Which is to do with the fuser, and turned out to be a blown thermistor.
Iv replaced the part and reassembled the fuser sleeve components with plenty of oil.
Now a month later the same error has appeared.
Does anyone know why this would keep happening? Or anyone experiencing the same on these.

Sent from my VTR-L09 using Tapatalk

OIL on fuser sleeves?

are they the SOFT fuser films?

do you mean the white fuser GREASE?

don't know of fusers that take oil on the rollers/sleeves unless applied by a fuser web .. or brush assm.

please clarify product used on sleeves.

[SalesServiceGuy]

Re: ES 7516AC error C471

If you have two copiers both doing the same thing, I would be suspicious of the power supply. The copiers work well and they are only a few months old.

Get a Tripp Lite LC2400 and check for brownouts. If the LC2400 starts repeatedly clicking, it is trying to compensate for unstable power supply.

Also, ESP's Digital QC surge suppressor will instantly check for poor grounding plus you can purchase a cable attached to your laptop installed with ESP's software and see some visuals on the quality of the power supply.

[blackcat4866]

Re: ES 7516AC error C471

I have an eS8508A (basicly the same fuser) that has blown the thermostat (4) times. I put the power quality analyzer on the line but did not catch anything interesting. It usually goes for 6 weeks or more, and I didn't want to leave the analyzer sitting there for 6 weeks.

Phil: these film fusers use a thick silicone based oil (in this case OIL-965-100). We have seen cases of the inside of the sleeve drying out, taking out the fuser drive gears. That's why barber mentions using the oil generously.

I suspect power. =^..^=

[barber782]

Re: ES 7516AC error C471

Yes the oil from Tosh seems a bit viscous and dries out quick. But I have used ricoh oil before with success.
Will have to check the power supply.

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[Blizzoo]

Re: ES 7516AC error C471

Make sure the users are setting the correct thickness for the paper they use.

My 1st C471 had the thermostat blown because they used 160gsm paper as plain paper and this caused the fuser to overheat.

The fuser oil type has been changed to a low viscosity to prevent the belts to torn apart and this can be ordered separately.

[barber782]

Re: ES 7516AC error C471

They only use 80gsm I think. I did mention to customer about getting a surge protector.

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[seansbar]

Re: ES 7516AC error C471

[barber782]

Re: ES 7516AC error C471

Ordered those modified holders, just waiting for them to arrive. Not holding much hope though.

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[Blizzoo]

Re: ES 7516AC error C471

You will have more success if you put new fuser belt, oil and new sheet pad. If these are all good just clean old remaining oil and put new oil 6LK44116000 - OIL-SILICONE-100CS Except CND or 6LK44116100 - OIL-SILICONE-100CSC for CND supplied as a service part.

Pay attention how you install the new holder/thermostat especially the wiring side.

[bryand]

Re: ES 7516AC error C471

C471 has been a nightmare lately. Mostly the 85/75ppm machines. We have lowered the fuser temps with little success. Happens most often after a fuser rebuild. We have installed the new thermostat holders/covers, firmware etc. Thermostats have been on backorder for 4 weeks

[blackcat4866]

Re: ES 7516AC error C471

I don't know if it will fix anything, but I tried the two-pronged approach:

1) New holder.
2) I tested the fuser unit exhaust fan in 03-462, 461. Tests OK in low and high speed.
3) I lowered the temperature at which the fans start/stop running: 08-2386 4>2 (to provide additional cooling).
4) I lowered the fuser temperature at the center thermistor by 5 degrees: Normal 08-2010-0 14>13, Low 08-2010-2 14>13, Decelerating 08-2010-10 12>11

We'll see if there's any improvement. =^..^=

[barber782]

Re: ES 7516AC error C471

Has anyone noticed the excess amount of white grease on and around the fuser gears? Iv been to 4 machines so far and found that the gears are starting to bind because of the amount of grease used.

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[SalesServiceGuy]

Re: ES 7516AC error C471

TSB-1903 Change of Thermostat Holder and Cover; Countermeasure to C471 and C472 Errors

Version 8Created by Jeff Boss on Aug 17, 2018 2:54 PM. Last modified by Jeff Boss on Mar 19, 2019 2:54 PM.
Copier Bulletin: TSB-1903 Rev. 01
Date: 03/19/2019

Models: e-STUDIO7506AC Series and e-STUDIO8508A Series

Subject: Change of Thermostat Holder and Cover; Countermeasure to C471 and C472 Errors

Overview
The Thermostat Holder and Cover have been changed to prevent C471 and C472 errors from occurring.

Table of Contents

• • Description of Symptom
  • Cause of Symptom
  • Description of Countermeasures
  • Application to Production
  • Interchangeability of the Pre- and Post-Change Parts
  • Changed/Added Part No.

Description of Symptom



Cause of Symptom

In some cases, the following two causes could result in a C471 error or C472 error to occur:

Cause 1: The Thermostat Cover (P-I: 42-54) may be caught by the hook of the Holder
(P-I: 42-51) and cause the Thermostat to break.

Cause 2: The lead wire of the Thermostat could get caught on the ribs of the Holder and cause the Thermostat to not function properly. (Refer to TSB-1902)


Description of Countermeasures

Countermeasure 1: To avoid the Thermostat Cover being caught by the hook of the Thermostat Holder, the shape of the Thermostat Cover has been changed. A mark "S18" has been added to the post-change cover for identification purposes.

Countermeasure 2: To prevent the lead wire from getting caught on the ribs of the Holder, the ribs have been removed.


Application to Production

The countermeasure described above has been applied to machines produced beginning with the following serial numbers:

e-STUDIO5506AC/6506AC/7506AC: CHFH27788
e-STUDIO5508A/6508A/7508A/8508A: CIFH28292

[seansbar]

Re: ES 7516AC error C471

Has anyone noticed the excess amount of white grease on and around the fuser gears? Iv been to 4 machines so far and found that the gears are starting to bind because of the amount of grease used.

that was the fix for the gears wearing out. Now everything is a mess. Gear grease, belt oil, all over everywhere. I have found if the belt is beyond PM life, then the fuser rollers start binding. Eventually the white gear in the gear box (behind the systems board) will fail and need a fuser kit and gear.