The #2 channel in my scope is dead (has been since i got it,for cheap at a yard sale.) and I finally want to fix it..
The scope is a B+K Precision 1471B
Wondering if anyone has a schematic,or any tips for repair,before I go order the schematic/parts list online..
I've popped off the little metal can cover on the 2'nd channel,and compared some voltages to the good #1 channel,it appears something is whacked in the front end (as I suspected)..There's a dual FET for each channel,a Sony (2S)K58..on the second channel the voltages on one of the dual FET's are all low,as in -V!
I think on the good circuits there was (SGD) +4.7V / 0V /+0.8V and on the "bad" FET they were about +4.7V / -7V /-6.4V !
There's a couple transistors and other things nearby that might be bad also,or perhaps part of the problem.. More investigation is needed,but i'd like to see if I could get a schematic first,hopefully with the correct voltages,etc. listed.
Is it not identical to the other channel? Be careful about ESD and compare directly if they are the same.
|All times are GMT. The time now is 03:17 PM.|
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2013 DragonByte Technologies Ltd.
Copyright ©1999-2013 diyAudio