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Author Topic: Power supply failure  (Read 2478 times)

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Offline Gip-GipTopic starter

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Power supply failure
« on: May 19, 2017, 04:01:09 am »
I shorted two pins on an OS-245(P)/U's power supply with my probe (on accident) and it won't power on anymore. Fuses are good, and I honestly have no clue except maybe one of the many transistors have died, or worse. Pins are P998
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Offline Armadillo

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Re: Power supply failure
« Reply #1 on: May 19, 2017, 05:33:46 am »
Is there any DC voltages at P890? +/- 25 volts. ?
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Offline Lorenzo_1

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Re: Power supply failure
« Reply #2 on: May 19, 2017, 05:39:02 am »
There looks to be a full service manual here with schematic for the LV supply at about p.268 in the pdf.

https://ia801304.us.archive.org/20/items/tektronix_OS-245_P_U/OS-245_P_U.pdf

Might help if you don't already have it.
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Offline Gip-GipTopic starter

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Re: Power supply failure
« Reply #3 on: May 19, 2017, 12:28:55 pm »
Yes. The problem is definitely the regulator.
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Offline Gip-GipTopic starter

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Re: Power supply failure
« Reply #4 on: May 20, 2017, 02:31:36 am »
All the removable transistors on the regulator test good. Should I go about testing the diodes first or the soldered transistors?
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Offline Armadillo

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Re: Power supply failure
« Reply #5 on: May 20, 2017, 03:20:46 am »
Please fix the components back. Just measure these voltages, and will be sufficient; see attached.

« Last Edit: May 20, 2017, 03:23:35 am by Armadillo »
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