Electronics > Repair

Fluke 8506A , need help with repair

<< < (8/8)

bdunham7:
So I poked at my spare panel board.  The three displays don't share a high-side driver, but they are all multiplexed through the 'J' circuit of U30, U25 and U20.  I tested using pin 12 of U20 for my low side and the collectors of Q2-Q8 in turn.  If the problem is in the 'J' circuit, you should also see the REMOTE (pin 19 U26), HI ACCURACY and NORMAL (pins 2 and 4 of U14) fail to operate.  Hopefully you have a clear schematic you can see all of that on.

m k:
I had once a problem where certain number turned on segments elsewhere, error segments were bright.
Reason was too high 5V, finally everything went blank and 5V was 7V, or something like that.

GigaJoe:
Thanks bdunham !!!

correct U 34 , 24, 13
and exact the thing -  AC: HI ACC, NORMAL - not lit up  (remote -not up, getting err-4)

I attached stitched schematic for the front board , will dig now ....

had replace all caps on PSU and adjust it ... but will check again

Navigation

[0] Message Index

[*] Previous page