Progress blog on CosmicPuppets STFM servicing

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Steve
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Progress blog on CosmicPuppets STFM servicing

Post by Steve » Thu Aug 13, 2020 9:58 pm

Hey guys,

Just a progress blog that I'll update as I go:

Motherboard: C070523-001

Problems:
* Corruption on DMA transfers, Ultrasatan
* Video output issues with sync/banding

Required services:
1. New Exxos PSU
2. STFM Video capacitor replacements (exxos kit)
3. Remove old motherboard ram
4. Complete motherboard re-cap
5. DMA and floppy resistor pull-up fixes
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

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Re: Progress blog on CosmicPuppets STFM servicing

Post by Steve » Thu Aug 13, 2020 9:59 pm

Just finished soldering in Exxos new PSU
new_psu.jpg
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PSU in the machine
new_psu2.jpg
new_psu2.jpg (561.02 KiB) Viewed 767 times
Test the machine boots with the new PSU
test_new_psu.jpg
test_new_psu.jpg (455.73 KiB) Viewed 767 times
Time to recap the video circuitry
video_old.jpg
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All caps replaced and resistor added for sync
video_new.jpg
video_new.jpg (321.32 KiB) Viewed 767 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

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Cosmic Puppet
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Re: Progress blog on CosmicPuppets STFM servicing

Post by Cosmic Puppet » Thu Aug 13, 2020 10:00 pm

:bravo:
US Atari 520 STFM (C070523-001 REV.D1) 4MB Marpet Upgrade, TOS 1.04, EmuTOS 1.0, Ultrasatan, PP Driver, Original Floppy Disk Drive, NEC Multisync EA193Mi Monitor.

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Re: Progress blog on CosmicPuppets STFM servicing

Post by exxos » Thu Aug 13, 2020 10:03 pm

:bravo: Kill the rubbish marpet while your in there ;)
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.

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Re: Progress blog on CosmicPuppets STFM servicing

Post by rubber_jonnie » Thu Aug 13, 2020 11:15 pm

@Steve Nice work sir.
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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Steve
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Re: Progress blog on CosmicPuppets STFM servicing

Post by Steve » Fri Aug 14, 2020 12:27 pm

Bye bye DRAM :)
IMG_20200814_121821.jpg
IMG_20200814_121821.jpg (477.01 KiB) Viewed 693 times
IMG_20200814_121802.jpg
IMG_20200814_121802.jpg (521.96 KiB) Viewed 693 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

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Cosmic Puppet
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Re: Progress blog on CosmicPuppets STFM servicing

Post by Cosmic Puppet » Fri Aug 14, 2020 1:42 pm

That's awesome!
US Atari 520 STFM (C070523-001 REV.D1) 4MB Marpet Upgrade, TOS 1.04, EmuTOS 1.0, Ultrasatan, PP Driver, Original Floppy Disk Drive, NEC Multisync EA193Mi Monitor.

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Steve
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Re: Progress blog on CosmicPuppets STFM servicing

Post by Steve » Fri Aug 14, 2020 3:45 pm

Remove the cap inside the modulator he says... Steve says no problems...

Holy mother of lord
IMG_20200814_131610.jpg
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IMG_20200814_131646.jpg
IMG_20200814_131646.jpg (369.86 KiB) Viewed 661 times
Okay, job done lol
IMG_20200814_133035.jpg
IMG_20200814_133035.jpg (353.77 KiB) Viewed 661 times

Motherboard fully re-capped with Vishay, Panasonic and Nichicon caps.
IMG_20200814_154122.jpg
IMG_20200814_154122.jpg (534.24 KiB) Viewed 661 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

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Re: Progress blog on CosmicPuppets STFM servicing

Post by PhilC » Fri Aug 14, 2020 4:37 pm

Looks like a nice job there @Steve
If it ain't broke, test it to Destruction.

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Steve
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Re: Progress blog on CosmicPuppets STFM servicing

Post by Steve » Fri Aug 14, 2020 8:28 pm

Floppy drive resistor fix applied:
IMG_20200814_201402.jpg
IMG_20200814_201402.jpg (434.82 KiB) Viewed 619 times
Test floppy and system by loading frontier:
IMG_20200814_202613.jpg
IMG_20200814_202613.jpg (423.73 KiB) Viewed 619 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

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