Test Equipment Anonymous

Latest project. This 7A24 350MHz plug-in has an issue where the trace on channel 1 fairly consistently bounces up and down several minor divisions. Channel 2 is OK. The plug-in is normally used in my 7904 but for easier troubleshooting it's installed in a 7603 that's on it's side. Hopefully it won't be too difficult to track down where the bounce is originating.

Looks for tants....can't see any.
Interconnects would be the next suspect.

As it's on the "happy side" i.e. you can service it I'd hit bits of it with a can of freeze spray and see what makes it get worse or goes away.

bd139 wrote: ↑Mon Sep 11, 2023 8:37 pm As it's on the "happy side" i.e. you can service it I'd hit bits of it with a can of freeze spray and see what makes it get worse or goes away.

Freeze spray is currently missing from my arsenal of chemicals so I'll have to order some. But I snagged the issue anyway. The unsteady trace was originating from around U1450. There appeared to be some dry solder joints. It was difficult to get to the pin side of the board but I was able to clean them up. Plus deoxit'ed the channel selector switch. No more unsteady trace.




Since the 7603N hasn't been powered up for a very long time I installed it's assigned plug-in's and gave it a check out. All is well.

And lab cat approves.

MED6753 wrote: ↑Wed Sep 13, 2023 3:22 pm Freeze spray is currently missing from my arsenal of chemicals so I'll have to order some.

Also useful for removing warts, especially near fingernails.

MED6753 wrote: ↑Wed Sep 13, 2023 3:31 pm And lab cat approves.

"Hoo-mannn! Get this big honking lump of... lump... the heck out of my spot to be gazed upon and adored!"

mnem
"oh, wait... that spot up there is warrrrrm..."

Lab Cat approval is definitely important! Buy-in from the supervisor is a must.

-Pat