Phihong PSM-5314 PSU TT Recap

Blogs & guides and tales of woo by forum members.
Post Reply
User avatar
Steve
Trusted Guru
Trusted Guru
Posts: 609
Joined: Fri Sep 15, 2017 11:49 am

Phihong PSM-5314 PSU TT Recap

Post by Steve » Tue Oct 13, 2020 2:04 pm

Service blog for this PSU recap using Exxos kit for customer.
New cap kit:
PXL_20201013_093111794.jpg
PXL_20201013_093111794.jpg (319.91 KiB) Viewed 512 times
PSU casing:
PXL_20201013_093114662.jpg
PXL_20201013_093114662.jpg (311.33 KiB) Viewed 512 times
PSU before recap:
PXL_20201013_104557149.jpg
PXL_20201013_104557149.jpg (382.2 KiB) Viewed 496 times
PSU after recap:
PXL_20201013_113828560.jpg
PXL_20201013_113828560.jpg (357.65 KiB) Viewed 512 times
PCB underside:
PXL_20201013_113840466.jpg
PXL_20201013_113840466.jpg (419.34 KiB) Viewed 512 times
Finished, with old caps in a bag:
PXL_20201013_114832246.jpg
PXL_20201013_114832246.jpg (394.98 KiB) Viewed 512 times
Will run some tests on it later.
Repairs & Servicing for Atari & Amiga machines (and any other retro computers) Located in the West Midlands UK. PM me if you require assistance.
www.solidstatesociety.co.uk

User avatar
Steve
Trusted Guru
Trusted Guru
Posts: 609
Joined: Fri Sep 15, 2017 11:49 am

Re: Phihong PSM-5314 PSU TT Recap

Post by Steve » Tue Oct 13, 2020 5:01 pm

Tests ok:
PXL_20201013_155924947.jpg
PXL_20201013_155924947.jpg (417.81 KiB) Viewed 470 times
PXL_20201013_155954667.jpg
PXL_20201013_155954667.jpg (436.23 KiB) Viewed 470 times
Repairs & Servicing for Atari & Amiga machines (and any other retro computers) Located in the West Midlands UK. PM me if you require assistance.
www.solidstatesociety.co.uk

czietz
Posts: 338
Joined: Sun Jan 14, 2018 1:02 pm

Re: Phihong PSM-5314 PSU TT Recap

Post by czietz » 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.

User avatar
Steve
Trusted Guru
Trusted Guru
Posts: 609
Joined: Fri Sep 15, 2017 11:49 am

Re: Phihong PSM-5314 PSU TT Recap

Post by Steve » Tue Oct 13, 2020 6:29 pm

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?
Repairs & Servicing for Atari & Amiga machines (and any other retro computers) Located in the West Midlands UK. PM me if you require assistance.
www.solidstatesociety.co.uk

czietz
Posts: 338
Joined: Sun Jan 14, 2018 1:02 pm

Re: Phihong PSM-5314 PSU TT Recap

Post by czietz » Tue Oct 13, 2020 7:07 pm

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.

User avatar
Steve
Trusted Guru
Trusted Guru
Posts: 609
Joined: Fri Sep 15, 2017 11:49 am

Re: Phihong PSM-5314 PSU TT Recap

Post by Steve » Tue Oct 13, 2020 8:00 pm

Thanks @czietz, I've placed an order for this new optocoupler. Seems to be a good idea :)
Repairs & Servicing for Atari & Amiga machines (and any other retro computers) Located in the West Midlands UK. PM me if you require assistance.
www.solidstatesociety.co.uk

User avatar
exxos
Site Admin
Site Admin
Posts: 12613
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
YouTube: https://www.youtube.com/user/exxosuk
Contact:

Re: Phihong PSM-5314 PSU TT Recap

Post by exxos » Tue Oct 13, 2020 8:05 pm

Be interesting to see before and after ripple... But also dips in voltage when the floppy drive motor turns on..
https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.

Post Reply

Return to “MEMBER BLOGS”