From John Crane@21:1/5 to All on Tue May 18 06:52:13 2021
Can anyone point me to documentation or schematics for this?
I have one in pristine condition, until last month when a capacitor blew...
Turns out these use the problematic Astec power supplies identical to
the ones used in the Osborne 01. There is a 0.1uF 250V polymer cap that
tends to blow. In fact, I've had 2 Osborne 01 machines that blew while
in service. I replaced the cap and now they work perfectly.
The Westwind, on the other hand, will not recognize the hard disk.
However the built-in ramdisk does work.
My fear is that when the cap blew, a voltage transient may have taken
out one or more of the large Shugart VLSI chips on the disk controller
board. These chips may be difficult to source these days.
From John Crane@21:1/5 to All on Tue May 18 06:49:11 2021
XPost: sci.electronics.repair
Can anyone point me to documentation or schematics for this?
I have one in pristine condition, until last month when a capacitor blew...
Turns out these use the problematic Astec power supplies identical to
the ones used in the Osborne 01. There is a 0.1uF 250V polymer cap that
tends to blow. In fact, I've had 2 Osborne 01 machines that blew while
in service - smoke and all. I replaced the cap and now they work perfectly.
The Westwind, on the other hand, will not recognize the hard disk.
However the built-in ramdisk does work.
My fear is that when the cap blew, a voltage transient may have taken
out one or more of the large Shugart VLSI chips on the disk controller
board. These chips may be difficult to source these days.