Search found 62 matches

by Pacman
Mon Oct 16, 2017 11:41 pm
Forum: PSU (power supplies)
Topic: How to: recapping the Mega STe power supply
Replies: 47
Views: 11352

How to: recapping the Mega STe power supply

I recently decided to replace all the electrolytic capacitors (recap) in my Mega STe power supply (Phihong PSM-5341) as a safety measure, considering it's close to 30 years old a "ticking time bomb". Better to replace before everything goes wrong than after! NOTE : the Atari TT also uses the same po...
by Pacman
Mon Oct 16, 2017 11:00 pm
Forum: PSU (power supplies)
Topic: Discharging capacitors, PSU-testing with dummy loads
Replies: 33
Views: 8775

Re: Discharging capacitors, PSU-testing with dummy loads

Thanks. I found some suitable ones: 2.2 Ohms/17 W high power resistor (1 pcs) TE connectivity 2.2 Ohms/6.1V/17W/10% SBCHE152R2K and 10 Ohms/17W high power resistor ( 1 pcs ) TE connectivity 10 Ohms/13V/17W/5% SBCHE1510RJ .... if they're not buying your dummy load resistor kit. i'm almost done writin...
by Pacman
Mon Oct 16, 2017 1:44 am
Forum: PSU (power supplies)
Topic: Discharging capacitors, PSU-testing with dummy loads
Replies: 33
Views: 8775

Re: Discharging capacitors, PSU-testing with dummy loads

We all have our own perspective on things, and the great thing about these forums is that we can all share what we know. I'm in the midst of writing it now and will link to several of your postings which I think will, in total, give a more complete picture of what it's all about :) One quick questio...
by Pacman
Fri Oct 13, 2017 8:54 pm
Forum: PSU (power supplies)
Topic: Discharging capacitors, PSU-testing with dummy loads
Replies: 33
Views: 8775

Re: Discharging capacitors, PSU-testing with dummy loads

Thanks!
Yes indeed, maintaining and looking after these dinosaurs sure has its rewards ...sooner or later!

You've already done several very nice guides, so this will be more of a "practical" guide on how I recapped the PSU, not explaining how it works etc.
I'll try to get it done sometime soon.
by Pacman
Fri Oct 13, 2017 10:56 am
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 10316

Re: Choosing between three Sony MPF-920 drives

I've just tried it (soldering a wire across the two CTIN switch pins) and just as I expected it works a whole lot better now: So now, when I exchange floppies, then open up a new window showing its content, the drive is forced to spin up and re-read the floppy (instead of displaying the content from...
by Pacman
Fri Oct 13, 2017 6:34 am
Forum: PSU (power supplies)
Topic: Discharging capacitors, PSU-testing with dummy loads
Replies: 33
Views: 8775

Re: Discharging capacitors, PSU-testing with dummy loads

A quick report as to what happened after recapping the Mega STe PSU... Using the dummy load resistors I quickly checked for each output rail and they were fine. Approx. the same values as before if I recall correctly, so I attached it to the computer and what do you know, the display output looked a...
by Pacman
Fri Oct 13, 2017 6:29 am
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 10316

Re: Choosing between three Sony MPF-920 drives

I'm assuming you soldered the pad on the V6 module to enable media change detect ? Aha! I think I understand: you designed the V6 module's logic specifically for the MPF-920, so together they work as expected and there's no need to short the disk detect switch. But when the drive is used with other...
by Pacman
Thu Oct 12, 2017 11:17 pm
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 10316

Re: Choosing between three Sony MPF-920 drives

Good suggestion to boot (and reboot over time) from a floppy with some AUTO folder software in it! I should probably do that DMA pullup modification you refer to. As I understand, it either improves stability or makes no difference (but won't cause any ill effects), right? I have some new findings r...
by Pacman
Thu Oct 12, 2017 11:14 am
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 10316

Re: Choosing between three Sony MPF-920 drives

Doesn't seem very promising for non-BH chip drives though my Sony chipped drive appears to work as it should (even with extended formats). Maybe mine can be the exception :lol: Or maybe it's got something to do with component tolerances as I understand the conclusion was regarding the DMA chip, and ...
by Pacman
Wed Oct 11, 2017 10:57 pm
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 10316

Re: Choosing between three Sony MPF-920 drives

I've just completed modifying (setting it to DS0 and adding a wire to the HD-detect switch so it can be used with the HD-module) my 2001 model MPF-920 E/131 (with the Sony chip) and it appears to work fine (in a Mega STe)! I haven't done any extensive tests, but did format a couple of HD and DD flop...

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