Re: 1541 Assy# 250442

Date: Thu, 24 Nov 2016 13:12:02 +0100
Message-Id: <>
> On 2016-11-24, at 11:28, smf <> wrote:
> On 24/11/2016 05:10, William Levak wrote:
>> Looking at the schmatic, I find a note that it is good for 250442 and 250446 with the following changes:
>>     Component    250442      250446
>>        UD4        9602       74LS123
>>        R12        22K          15K
>>        C31        33pF      Eliminated
>> It appears that the same PCB was used for two different assemblies.
> Do you know if there is any board rework required to convert a 250442 to a 250446? If so then this may have been reworked in the factory to use up existing pcb's (or some time later during a repair). It would be strange to change the ASSY number for a component change, but people (especially commodore people) do strange things.

I would expect the rework to be needed around the 74LS123 but nothing like that is visible on any of the 250442 boards I examined.


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Received on 2016-11-24 13:02:04

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