Electronics > Repair

Agilent 53132A Counter Repair (FIXED and Upgraded)

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crispy_tofu:

--- Quote from: TheSteve on February 03, 2016, 04:59:49 am ---I have a broken 53132A inbound, no idea what is wrong with it. If it is something simple I'll post it in this thread, if it turns into a big process I'll start a new thread.

--- End quote ---

Can't wait!  :)

uncle_bob:

--- Quote from: HighVoltage on February 03, 2016, 07:57:12 am ---Lately I have been blessed with repairs that turned out to be simple. You just have to take the time and go step by step through the signal path and eventually the problem will emerge.

For many days no, I have this counter hooked up to my HP GPSDO and out of the 12 digits, only the last two are changing
It is quiet impressive, how stable the counter and the GPSDO is.
I calibrated it once against the "locked" GPSDO and since then the system has been extremely stable.

And yes, it was a 12V fan that was installed in this counter.

uncle_bob,
since we now have the schematics for the power supply, you should be easily figure out, what the problem is.
BTW, how come you have hundreds of these ?
What for?
Pictures?

--- End quote ---

Hi

Needless to say, the counters are not mine. We use them at work. To avoid the whole "disclaimer" thing I don't post pictures of work. I'd rather not become their spokesman ...  That said, they are in the frequency products / timing industry.

Bob

TheSteve:
Received my "parts/repair" 53132A that was supposedly missing parts. The only part I know is missing is the back plastic bracket. I plugged it in and absolutely nothing happened. OK, lets take a closer look. The line and neutral wires were desoldered from the IEC connector. I looked over the supply and didn't see anything that looked bad so I reconnected them. The power supply seems fine and tests ok, the fan is dead of course. The counter itself fails the front end test and measure tests. I also see all of the HP branded PLCC chips near the front end have been resoldered or possibly changed. So perhaps this will be a bit of a challenge afterall. Looking at the schematic I should be able to feed a signal in and follow it through. I also have a 100% working 53132A to compare to so hopefully that will narrow things down pretty quick. Being both channels fail I am thinking the problem is a portion they have in common.

HighVoltage:
It looks like you have a much larger repair job than I had. Looking forward to your progress.

I really don't like it, when some instruments are sold as defect and then when you get them, you find out that someone has tried to fix it and usually caused more damage.

You are probably right that the fault has something to do, that is common to both input channels.
Is the self test showing any error numbers?

uncle_bob:
Hi

Be careful of the HP custom ASIC chips in these counters. About the only way I have ever seen to get them is to buy an entire board. You do *not* want to pay HP prices on those boards.

Bob

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