xerox 8850/510 power supply defect

[aakdag]

Hello,

There is a Xerox 8850/510 brand printer. LL-7F error exists. I detected deformation in bridge diode legs on AC Module. I ran it after cleaning it thoroughly, the fault still continues. But this device was repaired by someone else before me. LM741 is installed instead of LM7372MR (U10 coded) OPAMP. I can not find LM7372MR in Turkey. I will order from abroad. Could the cause of the LL-7F error be LM741?

I will be grateful to you if you could help me about this problem.

Best regards.

Abidin AKDAG
Konya/Turkey

 

[Harald Kapp]

Moved to new thread.

 

[bertus]

Hello,

You can NOT replace the LM7372 with a LM741.
The LM7372 is a high power, high speed, dual opamp.
The LM741 is a single, slow speed opamp.

https://www.digikey.com/en/products/detail/texas-instruments/LM7372MR/3701242

Bertus

 

[aakdag]

Hello,

You can NOT replace the LM7372 with a LM741.
The LM7372 is a high power, high speed, dual opamp.
The LM741 is a single, slow speed opamp.

https://www.digikey.com/en/products/detail/texas-instruments/LM7372MR/3701242

Bertus

Hello. Thank you so much Bertus,

I found the original OPAMP (LM7372MR). But the error still continues. Why could that be?

Also, I would be very happy if you share with me what the causes of LL-41, LL-45 and LL-81 fault codes are and their solutions.

 

[bertus]

Hello,

Did you know that XEROX has its own support forum?
https://forum.support.xerox.com/
Perhaps the manual gives you more info:
https://www.scribd.com/doc/230411151/8850-510DP-Service-Manual-pdf

Bertus

 

[aakdag]

Thank you so much