Electronics > Repair
Agilent 53132A Counter Repair (FIXED and Upgraded)
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Nuno_pt:
Hi zucca,

Here the price is 11.20€ + 23% VAT + Shipping so should be around 15€ from a local dealer.

I'll look for the ZD601 zener in my 53181A.
uncle_bob:
Hi

One of the wonderful things about the 53181 is that most people hate them. As a result they saw no use in their "first life" and sell at a discount to the 53131 (or at least they should). I have one sitting here maybe two feet from me. The factory stock fan is completely silent. Yes, it's running. Yes I do check every so often. The display is nice and bright. There's no big pile of crud inside it from the fan.

They either are a great source of parts for the 53132 or a nice little counter all on their own.

Bob
TheSteve:
I am 99% the 53132A is repaired - or will be when a new AD7243AR 12 bit DAC arrives. The counter has one for each front end. Data goes through the CH1 DAC (U46) into the CH2 DAC(U47). I was able to see that CH2 was mostly alive so I removed both DAC's and installed the CH2 one into CH1. I still get failures at boot time of course(CH2 DAC is missing) but CH1 now counts perfectly and reports the correct input levels. Its not the cheapest part but is easy to get which is nice. I will order the DAC and a replacement fan next week and post an update once the new part is installed.

btw, based on date code the following IC's were previously replaced - U50, U51, U52, U53, U54, U55, U65 and possibly U44. The date codes on all original parts are 96/97, the replacement parts are 2011.
uncle_bob:

--- Quote from: TheSteve on February 08, 2016, 02:24:25 am ---
btw, based on date code the following IC's were previously replaced - U50, U51, U52, U53, U54, U55, U65 and possibly U44. The date codes on all original parts are 96/97, the replacement parts are 2011.

--- End quote ---

Hi

Either somebody was very confused, or that counter took a *major* hit to it's front end back in 2011.

Bob
TheSteve:

--- Quote from: uncle_bob on February 08, 2016, 05:58:54 pm ---
--- Quote from: TheSteve on February 08, 2016, 02:24:25 am ---
btw, based on date code the following IC's were previously replaced - U50, U51, U52, U53, U54, U55, U65 and possibly U44. The date codes on all original parts are 96/97, the replacement parts are 2011.

--- End quote ---

Hi

Either somebody was very confused, or that counter took a *major* hit to it's front end back in 2011.

Bob

--- End quote ---

I am quite sure it didn't take any kind of hit and I have finally found the real problem. I am thinking they just started swapping parts trying to fix it but never got to the proper part. If it had taken some kind of hit I think something closer to the input would be damaged. Will order the DAC today, should have it tomorrow.

edit - DAC on the way via overnight fedex.
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