[sebhc] H90

[Bill Beech (NJ7P)]

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?

Thanks!

Bill

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.
> Carroll
> -- 
> Delivered by the SEBHC Mailing List
>
>

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