exxos's Atari, Amiga & retro forum

Posted: **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

Posted: **Thu Aug 13, 2020 9:59 pm**

Just finished soldering in Exxos new PSU

: new_psu.jpg (340.73 KiB) Viewed 4190 times

PSU in the machine

: new_psu2.jpg (561.02 KiB) Viewed 4190 times

Test the machine boots with the new PSU

: test_new_psu.jpg (455.73 KiB) Viewed 4190 times

Time to recap the video circuitry

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All caps replaced and resistor added for sync

: video_new.jpg (321.32 KiB) Viewed 4190 times

Posted: **Thu Aug 13, 2020 10:00 pm**

Posted: **Thu Aug 13, 2020 10:03 pm**

Kill the rubbish marpet while your in there

Posted: **Thu Aug 13, 2020 11:15 pm**

@Steve Nice work sir.

Posted: **Fri Aug 14, 2020 12:27 pm**

Bye bye DRAM

: IMG_20200814_121821.jpg (477.01 KiB) Viewed 4116 times

: IMG_20200814_121802.jpg (521.96 KiB) Viewed 4116 times

Posted: **Fri Aug 14, 2020 1:42 pm**

That's awesome!

Posted: **Fri Aug 14, 2020 3:45 pm**

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

Holy mother of lord

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: IMG_20200814_131646.jpg (369.86 KiB) Viewed 4084 times

Okay, job done lol

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Motherboard fully re-capped with Vishay, Panasonic and Nichicon caps.

: IMG_20200814_154122.jpg (534.24 KiB) Viewed 4084 times

Posted: **Fri Aug 14, 2020 4:37 pm**

Looks like a nice job there @Steve

Posted: **Fri Aug 14, 2020 8:28 pm**

Floppy drive resistor fix applied:

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Test floppy and system by loading frontier:

: IMG_20200814_202613.jpg (423.73 KiB) Viewed 4042 times

exxos's Atari, Amiga & retro forum

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