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
Progress blog on CosmicPuppets STFM servicing
Re: Progress blog on CosmicPuppets STFM servicing
Just finished soldering in Exxos new PSU
PSU in the machine
Test the machine boots with the new PSU
Time to recap the video circuitry
All caps replaced and resistor added for sync
- Cosmic Puppet
- Posts: 1689
- Joined: Fri Aug 02, 2019 1:03 am
- Location: West Yorkshire
- Contact:
Re: Progress blog on CosmicPuppets STFM servicing
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.
Re: Progress blog on CosmicPuppets STFM servicing
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.
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.
- rubber_jonnie
- Site Admin
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Re: Progress blog on CosmicPuppets STFM servicing
@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...
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...
Re: Progress blog on CosmicPuppets STFM servicing
Bye bye DRAM
- Cosmic Puppet
- Posts: 1689
- Joined: Fri Aug 02, 2019 1:03 am
- Location: West Yorkshire
- Contact:
Re: Progress blog on CosmicPuppets STFM servicing
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.
Re: Progress blog on CosmicPuppets STFM servicing
Remove the cap inside the modulator he says... Steve says no problems...
Holy mother of lord Okay, job done lol
Motherboard fully re-capped with Vishay, Panasonic and Nichicon caps.
Holy mother of lord Okay, job done lol
Motherboard fully re-capped with Vishay, Panasonic and Nichicon caps.
Re: Progress blog on CosmicPuppets STFM servicing
Looks like a nice job there @Steve
If it ain't broke, test it to Destruction.
Re: Progress blog on CosmicPuppets STFM servicing
Floppy drive resistor fix applied:
Test floppy and system by loading frontier: