| Electronics > Repair |
| HP 3310A Function Generator Repair (FIXED) |
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| Nirios:
I finally got around to purchasing my first function generator. It was won off Ebay and is in good shape. Everything appears to function except for the sine output. See attached images. I followed the service manual found at: http://elektrotanya.com/hp-3310a-b_function_generator_op-sm.pdf/download.html The service manual said to troubleshoot the sine shaping network and amplifier. My problem is the schematics in the manual appear to be missing pieces. I think I am supposed to start with the A3 board, but not certain. Anyone have a good scan of the service manual? Or knowledge of the steps to troubleshoot the sine wave section. Thanks. |
| grenert:
You can get the manual from the mothership: http://www.home.agilent.com/agilent/techSupport.jspx?pid=3310B:epsg:pro&pageMode=MN&lc=eng&cc=GB The manual is the same for A and B models. Congratulations on your find! The simple and clear, analog user interface makes it a pleasure to use. EDIT: It looks like the Agilent version is the one you got from elektrotanya. There is a gigantic 27MB manual at KO4BB's site: http://www.ko4bb.com/Manuals/HP_Agilent/HP_3310AB_OS.pdf |
| Nirios:
--- Quote from: grenert on January 22, 2013, 04:32:22 am ---There is a gigantic 27MB manual at KO4BB's site: http://www.ko4bb.com/Manuals/HP_Agilent/HP_3310AB_OS.pdf --- End quote --- Thank you! I was about to poke my eyes out looking at the other manual. Its amazing how much easier it is to read when you have the reference designations chart to use and full schematic pages. |O The decision tree says I need to troubleshoot the sine shaper network since there IS a good triangle signal on A1TP4. |
| Nirios:
Now I have a few question concerning my troubleshooting of the sine shaping network on the A3 board. TP5 measures -2.335 V TP7 measures 2.338 V TP6 shows the attached scope capture which is not the correct waveform according to the schematic. Am I correct to assume that the left and right green portions are working correctly? Would a faulty component in the yellow section cause the wrong waveform at TP6 or could a failing component in the above sine shaper amplifier cause the issue? EDIT: Typo on the 2.338 V point. |
| lowimpedance:
Now you have 2.338V on TP6 ?? , the same as TP7 ?. TP6 should be around 0V. This TP6 waveform appear at the sine amp output TP1?. If not and you do indeed have 2.338V at TP6 I would test for a shorted diode in the shaper cct. (right hand side of schematic most likely). Use the diode function on your DMM. Also a quick test that the transistors are still good You should also do a quick in cct test for any resistors that may have drifted well out of tolerance which would alter the dc operating conditions. (note, I'm sure you have confirmed all the supply rails are fine?) Also note that the sine shaper diodes are all selected as a set to provide the best symmetry and lowest possible distortion with this method. However if one is shorted then for hobby use you could just play with something similar and adjust for best performance. Above all have fun fault finding , you will end up with a handy little generator. LowZ |
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