Search found 62 matches

by Pacman
Sat Oct 21, 2017 1:42 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 tried your Media check program but didn't quite understand how to use it (yes, I've read the docs on the above page). Do you insert/remove floppy disks and see what the message is or does it simply "analyse" the drive once to determine the type of disk detect mechanism used? Also I could never ...
by Pacman
Sat Oct 21, 2017 12:37 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 taken a closer look at the CTIN switch of my Sony MPF-920E E/131 First, removing the wire across the two pins (i.e. like it was from the factory): Now, the topmost pin (closest to the insertion end of the floppy) is permanently connected to GND (as you can see from the PCB ground-plane). The bo...
by Pacman
Sat Oct 21, 2017 11:29 am
Forum: PSU (power supplies)
Topic: Arcing in Mega STe PSU
Replies: 27
Views: 7102

Re: Arcing in Mega STe PSU

Usually a manual switch produces sparks and voltage spikes when opening or closing the current. My guess would be, that this spike uses the lower solder point as an electrode and arcs to the chassis. Really? So AC household voltages actually go through the metal shielding of the PSU (and also the G...
by Pacman
Thu Oct 19, 2017 10:34 pm
Forum: PSU (power supplies)
Topic: Arcing in Mega STe PSU
Replies: 27
Views: 7102

Re: Arcing in Mega STe PSU

I don't know. There wasn't one on mine (I bought the computer 2nd hand so I can't say if there ever was one to begin with). Are you saying the arcing is a common thing and not a fault? I have some transparent plastic overhead sheets -perhaps I could use one or two of those layered, or are we talking...
by Pacman
Thu Oct 19, 2017 9:00 pm
Forum: PSU (power supplies)
Topic: Arcing in Mega STe PSU
Replies: 27
Views: 7102

Arcing in Mega STe PSU

Having just recapped my Mega STe power supply successfully ( I wrote a "how to" here ) I noticed some electrical arcing spots right underneath where the AC household current enters the PSU circuit board. 20170929-145140_IMG_7810.jpg 20170929-145218_IMG_7814.jpg What might be the cause of this? Loose...
by Pacman
Thu Oct 19, 2017 4:09 pm
Forum: PSU (power supplies)
Topic: How to: recapping the Mega STe power supply
Replies: 47
Views: 11352

Re: How to: recapping the Mega STe power supply

Although a bit over my head I vaguely understand what you're saying: that components interact with each other.
I suggest you contact Czietz and ask about the details.
by Pacman
Thu Oct 19, 2017 2:16 pm
Forum: PSU (power supplies)
Topic: How to: recapping the Mega STe power supply
Replies: 47
Views: 11352

Re: How to: recapping the Mega STe power supply

I read about it here.
Apparently recapping didn't make a difference in this respect, but replacing mentioned part did.
What does that opto-isolator even do?
by Pacman
Tue Oct 17, 2017 3:04 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

A silly question..... how/where do I check write protect?
Is that a high (2V-5V) and low (0-0.8V) signal to check at some particular pin with a voltmeter/multimeter?
by Pacman
Mon Oct 16, 2017 11:44 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 for confirming. The pinout should be correct.
I've just posted the "how to" here. I hope someone finds it useful.

Go to advanced search