Canon IRA C5051 Thermistors

[IkeW0491]

Re: Canon IRA C5051 Thermistors

Are the thermistors readings the same as on Teckats foto ?
If one indicates a low temperature I asume it is not reaching the DC controller -> check the cabling.
A disconnected thermistor will cause overheating causing E001.
The heaters of this machine only come on when it is printing, so go to Service Mode to read the temperatures and print something.
All the three thermistors should indicate a rise in temperature, if not then the one which does not rise is the cause.

Hi Spectra,

When I try to print and it errors out, The temps rise up to 28C for the C, and up to 198C for the E & E2.

Then they start to drop off, due to of course the fuser assy cooling off.

These thermistors are built into the Film Unit assembly and cannot be removed. The Film unit is New, so it should stand to reason that the thermistors should be OK.

[spectraindo]

Re: Canon IRA C5051 Thermistors

OK I know you have a new Fixing assy and get the same issue, so when the C thermistor reading is only 28C when it is supposed to be 180+ C, then the connection from the fixing assy to the DC controller is faulty.
These machines have very small wires, so when a connector is plugged out with force it could easily break.
I have this issue once with a iR4570 when one of the connectors pin was bend, so one thermistor was disconnected from the DC controller causing high temperatures inside the fixing assy and causing E001.

[IkeW0491]

Re: Canon IRA C5051 Thermistors

OK I know you have a new Fixing assy and get the same issue, so when the C thermistor reading is only 28C when it is supposed to be 180+ C, then the connection from the fixing assy to the DC controller is faulty.
These machines have very small wires, so when a connector is plugged out with force it could easily break.
I have this issue once with a iR4570 when one of the connectors pin was bend, so one thermistor was disconnected from the DC controller causing high temperatures inside the fixing assy and causing E001.

hi Spectra,

I understand your point, but this issue started before any work was done on the DC controller card or connections.

I can check the wires, but I am sure they are all ok, how would I verify that the cables are not broken or damaged (other than eyeing them), what voltages should I be seeing at the various connectors??

As for thermistor C never getting to 180C, it isn't on long enough (at least in my opinion) to get that hot.
The machine starts the printing process, but never even sends 1 page, errors out right away (within 10 sec.) and the machine is not even warm in the area of the fuser.

Its almost like the fuser is Never heating up, but is giving the hi-temp error?!?!?!

Strange problem to say the least.

Thanks again for all the ideas, I won't discount any information when it comes to this issue.


IKE

[IkeW0491]

Re: Canon IRA C5051 Thermistors

So after further review and troubleshooting, it has been determined that one of the Bearing Holders for the pressure roller was in backwards, thus causing all this fuss!!

Also we noted that there is a problem with the Shutter Driver motor (giving error code E00840-000), am ordering a new Shutter Drive Mount Assembly

PN FM3-5928-000.

Hopefully this will fix this problems we are having with it.

Thanks again for all your ideas and help. It is truly appreciated.

IKE

[spectraindo]

Re: Canon IRA C5051 Thermistors

Well it seems you have a lot of problems with the machine.
The Shutter is used to open and close the airflow from the cooling fans.
When you print on small width paper (A4R, LGL, A5R) it opens the flow to cool down the edges of the Fixing unit.
The heating time of the Heating Elements is very fast about 4 seconds it will reach 200C, and all thermistors must show the temperature of their respective places. When the C thermistor shows 28C then the DC controller will further turn on the heaters until the E thermistors detects overheating and shut off the Heaters.
With the machine OFF, tou can measure the continuity of J42 to the DC controller, with one probe to ground and the other to the pins of J42.
See attachment.