Progress blog on CosmicPuppets STFM servicing

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

Progress blog on CosmicPuppets STFM servicing

Post by Steve »

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

Re: Progress blog on CosmicPuppets STFM servicing

Post by Steve »

Just finished soldering in Exxos new PSU
new_psu.jpg
new_psu.jpg (340.73 KiB) Viewed 2891 times
PSU in the machine
new_psu2.jpg
new_psu2.jpg (561.02 KiB) Viewed 2891 times
Test the machine boots with the new PSU
test_new_psu.jpg
test_new_psu.jpg (455.73 KiB) Viewed 2891 times
Time to recap the video circuitry
video_old.jpg
video_old.jpg (308.89 KiB) Viewed 2891 times
All caps replaced and resistor added for sync
video_new.jpg
video_new.jpg (321.32 KiB) Viewed 2891 times
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Cosmic Puppet
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Re: Progress blog on CosmicPuppets STFM servicing

Post by Cosmic Puppet »

:bravo:
US Atari 520 STFM (C070523-001 REV.D1) , Exxos PSU, 4MB Marpet Upgrade, Exxos 6 Chip TOS 1.04 USA, EmuTOS 20211020, Ultrasatan, PP Driver, Original Floppy Disk Drive, NEC Multisync EA193Mi Monitor, Star LC-10c Printer, iMP C100110-001 DMA.
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exxos
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Re: Progress blog on CosmicPuppets STFM servicing

Post by exxos »

:bravo: Kill the rubbish marpet while your in there ;)
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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rubber_jonnie
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Re: Progress blog on CosmicPuppets STFM servicing

Post by rubber_jonnie »

@Steve Nice work sir.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Steve
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Re: Progress blog on CosmicPuppets STFM servicing

Post by Steve »

Bye bye DRAM :)
IMG_20200814_121821.jpg
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IMG_20200814_121802.jpg
IMG_20200814_121802.jpg (521.96 KiB) Viewed 2817 times
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Cosmic Puppet
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Re: Progress blog on CosmicPuppets STFM servicing

Post by Cosmic Puppet »

That's awesome!
US Atari 520 STFM (C070523-001 REV.D1) , Exxos PSU, 4MB Marpet Upgrade, Exxos 6 Chip TOS 1.04 USA, EmuTOS 20211020, Ultrasatan, PP Driver, Original Floppy Disk Drive, NEC Multisync EA193Mi Monitor, Star LC-10c Printer, iMP C100110-001 DMA.
Steve
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Joined: Fri Sep 15, 2017 11:49 am

Re: Progress blog on CosmicPuppets STFM servicing

Post by Steve »

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 2785 times
Okay, job done lol
IMG_20200814_133035.jpg
IMG_20200814_133035.jpg (353.77 KiB) Viewed 2785 times

Motherboard fully re-capped with Vishay, Panasonic and Nichicon caps.
IMG_20200814_154122.jpg
IMG_20200814_154122.jpg (534.24 KiB) Viewed 2785 times
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PhilC
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Re: Progress blog on CosmicPuppets STFM servicing

Post by PhilC »

Looks like a nice job there @Steve
If it ain't broke, test it to Destruction.
Steve
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Re: Progress blog on CosmicPuppets STFM servicing

Post by Steve »

Floppy drive resistor fix applied:
IMG_20200814_201402.jpg
IMG_20200814_201402.jpg (434.82 KiB) Viewed 2743 times
Test floppy and system by loading frontier:
IMG_20200814_202613.jpg
IMG_20200814_202613.jpg (423.73 KiB) Viewed 2743 times
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