OKI ES7411 - Postcript error when printing

[Francesc V.]

2 years after I fixed 2 ES7411 printers (see post here), one of these stopped printing "correctly" . From one day to other, when sending something to print it was printing out the following:



What it seemed a software Postscript error it has turned into a mainboard PCB issue (thanks GOD I have 2 printers to swap and test).

I took the PCB, removed the 10 caps and 5 of them were faulty. So with a simple recap, I have the printer again back to live. Here the 5 that were faulty.........just in case it might help someone in the future.





Regards,
Francesc.

[stj]

the red caps are polymer,
did it really trash them??

btw, what is the internal SD card for?
something optional?

[Francesc V.]

the red caps are polymer,
did it really trash them??

btw, what is the internal SD card for?
something optional?

The picture shows already changed caps. The original ones (below) had a big ESR, out of range. Not sure if these are polymer, but they are the out of specs.




Here the Digikey list.........Red and Cian ones are polymer, the first one is hybrid.. Reds have writen '470' but they are 47.............don't understand it. xDD




I am not sure, but I guess the SD card is for firmware updates.

Regards,
Francesc.