Hp 3326a Service Manual
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Hi, I recently acquired an HP 3326A dual output function generator off of eBay. When I fired it up for the first time it went through a short series of self tests which it passed, after that it showed 'error 171'. This means that channel B is overloaded according to the user manual. However, nothing is connected to the output. Channel A seems to work fine from the limited tests I have run, but when I connect channel B to a scope the output is wrong. I do get some output, ie for the sine wave option I get a sine wave that is in the millivolts range and if I remember correctly it is dc offset up a bit too.
When I run a square wave the output is not square at all, it appears more like pulses at the start and stop point of where the square wave should be. (I'll try and post pictures later.) When I run both channels together and combine them into channel A they seem to add up correctly.
If I add two waves together I get an output that looks correct. I have also run all the internal self tests (beyond the start up tests) and it passes all of them. I'm hoping it's something simple that someone on this forum might be able to give me a head start on. I managed to buy a service manual for it, and I will be going through it more thoroughly when I get some time soon. I would appreciate any head start I can get though!
I do have to note that this thing is huge! So much bigger than it looked in the ebay pictures:-) it weighs around 70lbs and when I opened the top I think that most of the structural internals are cast and machined aluminum!
It is really cool looking inside I must say, and I'm looking forward to taking it apart. For the sake of helping anybody else who may run across this particular piece of equipment and have this particular problem with it I will record the solution to the 'error 171 - channel X overloaded' on my HP 3326A function generator. Being relatively new to the repair game it took me some time to work through everything and get a sense of what was going on, and what was causing the failure. As I mentioned earlier, I narrowed it down to the high voltage board (opt 002) for channel B.
The symptoms showing on the board were: A: Zener diode CR117 had failed B: Pico fuse F502 was open C: Capacitors C113 and C114 were shorted to ground It took me a while to get see that the capacitors had failed as I was playing around with the fuses and zener diode (which I found first), thinking that they were somehow at fault (rather than a symptom). Pico fuse F502 is not shown in the attached diagram, but is in series with the -28V circuit coming from the power supply. In hind sight it is fairly easy to guess what was may have happened.