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| HP 5335A Timer / Counter - Anything i should know? |
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| TERRA Operative:
I had a look through my spare PCB's. Unfortunately while I have the two 'motherboards' I don't have the input board. I'll keep an eye out locally if one pops up though. |
| David Aurora:
--- Quote from: TERRA Operative on May 24, 2023, 11:51:36 am ---I had a look through my spare PCB's. Unfortunately while I have the two 'motherboards' I don't have the input board. I'll keep an eye out locally if one pops up though. --- End quote --- Thanks! I asked on an HP group as well, and I'm watching eBay. With any luck something will turn up somewhere |
| Wrenches of Death:
--- Quote from: TERRA Operative on May 23, 2023, 02:48:24 pm --- Also, there is an electrolytic cap on the PSU section, just next to the small green edge connector that I have found is really needing replacement in 2 out of 2 units I've poked at so far. --- End quote --- All of mine are buttoned up and stacked right now. Is this the small upright radial leaded Sprague capacitor designated as A1C2? The manual lists it as 100uf @ 15VDC. If so, I'll drop a few in my Mouser cart and snag them on the next order. Were yours leaking, bulging, or failing electrically? Many thanks in advance! WoD |
| TERRA Operative:
Yeah, that's the one. Mine tested almost no capacitance so I think they dried out or something. I just replaced them with a 105degree rated cap. I think one of my two units even got the exact original type capacitor )possibly higher voltage though) as they are still available new, but it's not a critical application here I think so any decent capacitor would be fine. |
| Wrenches of Death:
--- Quote from: TERRA Operative on July 02, 2023, 04:55:50 pm ---Yeah, that's the one. Mine tested almost no capacitance so I think they dried out or something. --- End quote --- Thanks. I just added them to my cart and pulled the trigger. All three counters seem to be behaving other than one of the little transistor sized relays for option 40. The easiest way to check it was to simply remove the driver transisor. The relay is bad and tough as hell to find new for a reasonable price. I've got a parts hulk around here that I'll eventually get around to robbing a used relay from. If I don't forget, I plan to test the three original A1C2 caps after I replace them and will post the results. With both of yours being bad, this may be a common failure component and well worth replacing in any 5335A. Thanks again! WoD |
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