Electronics > Repair

Tektronix AFG-3022C - power supply issues

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Paulo Peres:
 ??? Hmmm.
For a moment I thought I was going crazy.
I was reading the 071-1640-04 manual. The correct manual for this instrument is 071-1640-02.

If I didn't measured the voltages before, I would think someone exchanged the power supplies.

Anyway, now I know I need more information about 119-7153-00 power supply. Does anybody can confirm if it really corresponds to 7001318-J000 I have?

m k:
Check if the PSU has an obvious internal/external regulation setting.
Maybe some models need more and internal regulators are not enough.

Newer manuals have PSU revision as -xx, so there are more than few.
Bypassing internal regulators would mean backward compatibility and is easy to make.

lern01:

--- Quote from: Paulo Peres on November 12, 2023, 03:40:03 pm --- ??? Hmmm.
For a moment I thought I was going crazy.
I was reading the 071-1640-04 manual. The correct manual for this instrument is 071-1640-02.

If I didn't measured the voltages before, I would think someone exchanged the power supplies.

Anyway, now I know I need more information about 119-7153-00 power supply. Does anybody can confirm if it really corresponds to 7001318-J000 I have?

--- End quote ---


I have an AFG3101, and the power module is also Artesyn 7001318-J000. The A72 is 672-5815-04, the A31 is 671-6052-01, and the A51 is 672-5953-02. The machine starts up normally, but Diagnostics reports error 2303 and Calibration reports error 1103, both of which are related to DC bias. The no-load outputs of the power module are 7.2V, 4.32V, +18.73V, and -18.92V. When connected to the A72, the voltages are 7.21V, 4.4V, +18.34V, -18.79V, -4.99V, and -4.91V. According to the service manual (071-1640-02), it should be ±15V. Is the output of the power module normal now? Is it ±18V or ±15V? Looking forward to your reply, thank you!

m k:
Manual 071-1640-02 page 3-2 has a block diagram, there power supply is +/-15V.
A bit above that is a local regulators rectangle, clearly a separated and different thing.

Next page defines power supply as +/-15V.
Next page from that defines A11/A12 board local regulator also as +/-15V.
Two different things.

It's possible that all final voltages are from local regulators, but obviously no definitive answers available.
So check the power supply visually, if you can't find any texts then maybe components can give some directions.
Though net pictures are clearly not very promising.

lern01:
It has been fixed. The power supply is fine, it is a soft fault of the amplifier tube on the amplifier board. I hand-drew the amplifier board circuit diagram, if you need it, please contact me.

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