Fluke 123 OQ0257 T-Asic search

Fluke 123 OQ0257 T-Asic search
Posted by mario_nks on 18 Jul, 2023 06:54
Hello,

I'm looking for an OQ0257 T-Asic to repair my Fluke 123.

Kind regards

Markus

#2 Reply
Posted by ApertureScience on 22 Jul, 2023 04:00
Hello Markus!
Would you mind sharing how you did acquire the part? Fluke Germany recently stated no availability to me. Thanks!

#3 Reply
Posted by shakalnokturn on 24 Jul, 2023 23:37
Relative to this topic:
https://www.eevblog.com/forum/repair/fluke-123-124-125-scopemeter-t-asic-needed/

I'm also still in search of one that would cost less than the scope itself.
The other option was design a flexible PCB holding the opamp for the reference voltages + micro conroller for I²C to relay control that would piggyback to the T-ASIC and solder relativley easily to the TQFP leads.

#4 Reply
Posted by ApertureScience on 02 Aug, 2023 09:42
I talked to Markus and he hasn't found the golden pot of Philips Asics. His T-Asic had data lines shorted and removing the short solved the problem. The search continues. I'm gonna check for shorted data lines. If I can't fix it, which I probably can't, I'm gonna sell the meter with good power and data Asic on eBay. Thanks Markus!