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Re: General Stuff(tm)
Posted: 06 Feb 2024 14:00
by stephen_usher
The Mean Well is here, but my brain isn't as I've hardly slept for the last couple of nights.
Re: General Stuff(tm)
Posted: 06 Feb 2024 14:41
by rubber_jonnie
stephen_usher wrote: 06 Feb 2024 14:00
The Mean Well is here, but my brain isn't as I've hardly slept for the last couple of nights.
I can relate to the no sleeping, it's been the same for me too. Hope you get some Zzzzz's soon.
Re: General Stuff(tm)
Posted: 06 Feb 2024 22:12
by stephen_usher
I got back early from my birthday meal so pressed on with the Kaypro power supply.
Mounted the Mean Well to the adapter plate and epoxyed the original connector to the plate as well
IMG_3562.jpeg
IMG_3563.jpeg
IMG_3564.jpeg
Then wired it all up, tested the voltages, tested again and triple checked.
Plugged it all in...
Turned on the power and...
BANG! BANG! BANG! FLASH!
Lots of explosions and sparks from the two Shugart floppy drives!
My first thought was, "Have I messed up?" Tested the voltages again and all fine. Then I realised... tantalums!!! Flippin tantalums on the 12V rail of the floppy drives. *sigh*
Disconnected the power to the drives and switched on...
IMG_3565.jpeg
Yay!!! A working Kaypro, well except for the floppies.
I'll have to find out what values they should be and fit replacements.
Re: General Stuff(tm)
Posted: 06 Feb 2024 22:22
by rubber_jonnie
Yaaay.
Birthday fireworks and a booting Kaypro, what more could you ask for :)
Re: General Stuff(tm)
Posted: 06 Feb 2024 22:36
by stephen_usher
Hehe.
Well, some Imperial allen keys would be useful, so I can get the flippin' drives out!
Re: General Stuff(tm)
Posted: 07 Feb 2024 13:06
by PhilC
It wouldn't be the same without the fireworks :fire1:
Re: General Stuff(tm)
Posted: 07 Feb 2024 13:56
by stephen_usher
:)
Re: General Stuff(tm)
Posted: 07 Feb 2024 19:01
by stephen_usher
The Imperial allen keys arrived via Amazon Prime so I've managed to get the floppy drives out of the Kaypro....
Soooooooo many tantalums! All 4.7uF 35V and all shorted. The explodified one is on the 5V rail surprisingly.
IMG_3567.jpeg
Re: General Stuff(tm)
Posted: 07 Feb 2024 19:56
by rubber_jonnie
stephen_usher wrote: 07 Feb 2024 19:01
The Imperial allen keys arrived via Amazon Prime so I've managed to get the floppy drives out of the Kaypro....
Soooooooo many tantalums! All 4.7uF 35V and all shorted. The explodified one is on the 5V rail surprisingly.
IMG_3567.jpeg
Oooh, that one really blew it's top! Not like it for the 5v rail though really, but hey ho, it is a tantalum :)
Did both drives go?
Re: General Stuff(tm)
Posted: 07 Feb 2024 23:27
by stephen_usher
Yes, in the same way.
I've replaced them all with 10uF 16V electrolytics as they're just doing bulk capacitance.
The drives now run, though getting the motors and spindle to free up was "fun". The spindles are running at the correct speed but there are dead spots on the motors which means if they stop at a specific location the motor doesn't start and this is the same on both drives, but affects drive B more.
I *think* I've made a boot floppy using ImageDisk on my Win98 box and a 1.2MB drive but it's not booting. It sees the disk but can't read it. Now this could be due to the drive or the format or the images I have. Without a known good system I can't tell.