Electronics > Repair
Repair : HP 3245A precision DC/AC source
Samogon:
I have drilled out rivets with drill bit bigger than rivet heads diameter. Punch pivoting hole in the center of the rivet head.
First if all make complete self test, get service manual and CLIP
So that is fir the start
rastro:
--- Quote from: MasterTech on March 12, 2020, 08:31:19 pm ---
--- Quote from: JesseLackey on March 12, 2020, 06:29:32 pm ---
3. The electrolytics all look just fine. I'm going to spot check ESR on 2-3 largest ones, if the ESR looks ok, should I replace anyway? Opinions?
--- End quote ---
Negative, C900 must (and here must is must of the utmost must) be replaced with a 35V replacement
--- End quote ---
The unit with the "ERR 92" most likely has the C900 bad on one of the driver PCB's.
JesseLackey:
Hi all, thanks for the tips, I'm going to replace C900 and all the other electrolytics besides. I'm making the shopping list now.
I have all the docs for the 3245A, including the very useful CLIP.
I have a dumb newbie problem. I can't pull the pcb shown below from the backplane, I've removed all 7 screws and it moves a few mm but then it seems like it is latched in place or something like that.
I've used a fair amount of force. I want to make sure I'm not missing something before I pull harder.
Image below.
Any thoughts greatly appreciated.
J
PartialDischarge:
There is a screw on the side that relases the metal plate over which both boards are mounted.
Also buy some green through hole fuses that that board has near the connector, cause they may be blown
rastro:
The PCB's are a pain to remove - lot of jiggle and sliding. There should be a procedure in the manuals as I recall. Check for PDF's on line.
I had the C900 go bad. You definitely need to order the solder in fuses - most likely blown.
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