Phihong PSM-5314 PSU TT Recap

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Steve
Posts: 2056
Joined: Fri Sep 15, 2017 11:49 am

Phihong PSM-5314 PSU TT Recap

Post by Steve »

Service blog for this PSU recap using Exxos kit for customer.
New cap kit:
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PSU casing:
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PSU before recap:
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PSU after recap:
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PXL_20201013_113828560.jpg (357.65 KiB) Viewed 2265 times
PCB underside:
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PXL_20201013_113840466.jpg (419.34 KiB) Viewed 2265 times
Finished, with old caps in a bag:
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PXL_20201013_114832246.jpg (394.98 KiB) Viewed 2265 times
Will run some tests on it later.
Steve
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Joined: Fri Sep 15, 2017 11:49 am

Re: Phihong PSM-5314 PSU TT Recap

Post by Steve »

Tests ok:
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PXL_20201013_155954667.jpg
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czietz
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Re: Phihong PSM-5314 PSU TT Recap

Post by czietz »

Note that if this PSU is ever intended to go into a Mega STE, the optocoupler should be changed. Search the older threads for possible replacement part numbers. The optocoupler in the pictured PSU is known to cause 50 Hz output ripple that becomes visible as slight flickering of the screen in the MegaSTE in monochrome mode.
Steve
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Joined: Fri Sep 15, 2017 11:49 am

Re: Phihong PSM-5314 PSU TT Recap

Post by Steve »

czietz wrote: Tue Oct 13, 2020 5:14 pm Note that if this PSU is ever intended to go into a Mega STE, the optocoupler should be changed. Search the older threads for possible replacement part numbers. The optocoupler in the pictured PSU is known to cause 50 Hz output ripple that becomes visible as slight flickering of the screen in the MegaSTE in monochrome mode.
Thank you for the information. This is TT only. So is the PC111 a recommended optocoupler for both MSTE and TT?
czietz
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Joined: Sun Jan 14, 2018 1:02 pm

Re: Phihong PSM-5314 PSU TT Recap

Post by czietz »

Steve wrote: Tue Oct 13, 2020 6:29 pm Thank you for the information. This is TT only. So is the PC111 a recommended optocoupler for both MSTE and TT?
Yes, it is.

Disclaimer: Of course, like with any PSU work, be sure to re-test with the dummy load after changing the opto-coupler to be sure that the output voltages are correct.
Steve
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Joined: Fri Sep 15, 2017 11:49 am

Re: Phihong PSM-5314 PSU TT Recap

Post by Steve »

Thanks @czietz, I've placed an order for this new optocoupler. Seems to be a good idea :)
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Re: Phihong PSM-5314 PSU TT Recap

Post by exxos »

Be interesting to see before and after ripple... But also dips in voltage when the floppy drive motor turns on..
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