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| Data Precision 2020 Function Generator repair |
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| ioprev:
Hello, New member here in the forum (not that new in the field) I got a Data Precision 2020 function generator that doesn't boot up. With power on, only fan works everything is off in front panel. First thing I checked was the PSU, which seems to work as it gives stable +5V, -5V, +15V, -15V and 3.8V(?) outputs. However since I only have the User’s manual, I cannot say if this is the correct voltages and not really sure what to check next. Is there anyone with experience repairing this instrument? Service manual would help if someone has a copy of it. Thank you very much! John |
| fcb:
3.8V sounds obscure. 1. See if you can reverse engineer the PSU to work out what it should produce? 2. Look at what it drives, does 3.8V seem right? Can you measure the current running through each supply? This might give you an idea. Alot of this old gear had tantalum caps.. |
| duak:
Ioprev, As fcb says look at where the power supply voltages go. Look for leaking or damaged capacitors and for loose connectors. Since the display is not working I would see what voltages it needs. There should be a low voltage AC signal for the filament and a higher DC voltage for the anodes. Is the display board from a different company? The 3.8 V is unusual. Since this unit is likely from the 80's or 90's it probably has some ECL in it for the high speed waveform generator. ECL usually used 5.2 V so perhaps the 3.8 V shows there is a fault on that line. Let us know what you find. Good Luck, |
| Testtech:
Could the 3.8V be the VFD filament supply? |
| duak:
The 3.8 V could be for the filament - is there an AC signal in addition to the DC?. VFDs usually use AC because DC affects the brightness from side-to-side. see: https://www.noritake-elec.com/technology/general-technical-information/vfd-operation |
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