carrollwaddell at sc.rr.com
Sat May 12 20:38:34 CDT 2007
Bill Beech (NJ7P) wrote:
> I am trying to repair an H8 computer. I have downloaded the manuals,
> but there is only a schematic for the cassette interface. I suspect
> the schematics were part of the larger foldouts for the boards.
> Anyone got the schematic scanned in for the CPU, Memory and Disk
> controller cards?
> Carroll Waddell wrote:
>> Lee Hart wrote:
>>> From: Carroll Waddell
>>>> This board is hard to troubleshoot because it's so hard to get
>>>> to in the machine.
>>> Ah, you do not know the secret!
>>> Tape a piece of nonconducting wood, foam or rubber along the top
>>> edge of the CRT (to prevent shorts). Install the CPU board
>>> horizontally, so its lower edge sits on top of this insulator. The
>>> two screws that normally mount the CPU board still go in the
>>> vertical brackets.
>>> You'll find that the cables are barely long enough so with careful
>>> routing you can still plug them in. Now you can easily get at both
>>> sides of the board to probe things, change parts, etc.
>>> I would not waste my life in friction when it could be turned into
>>> momentum. -- Frances Willard
>>> Lee Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net
>>> Delivered by the SEBHC Mailing List
>> Thanks Lee. I'm glad to know to turn the CPU board around. I now have
>> the CPU board and memory expansion board working. Will try diskette
>> adapter and serial adapter next week. Thanks again.
>> Delivered by the SEBHC Mailing List
> Delivered by the SEBHC Mailing List
If you don't find your schematics, I'll look next week and see what I
have. I just finished repairing an H8 to put on EBAY, so I'm sure I
have those things lying around somewhere. I'll copy them for you next
week and mail them to you.
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