Re: Two 1541-II drives with problems

Right, good point! Checking the error channel can give a good hint too! 

On 20 April 2014 11:09:23 CEST, Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote:
>On 04/19/2014 02:14 PM, Ville Laustela wrote:
>>
>> Hello!
>>
>> I found out that I own two Commodore 1541-II disk drives, both in a
>non-working state.
>>
>> Testing with a measured-good PSU, I got the following results with
>both drives:
>>
>> - power on: normal activity (power led on, spindle runs and drive led
>lights for few seconds, then stop)
>> - connected to a C64: drive resets with the computer normally
>> - attempting to load halts at "SEARCHING FOR": drive spins (with leds
>on) but the stepper doesn't move. Only way out is to reset the
>computer.
>
>Last month a friend and I fixed an SX-64 where the drive was behaving 
>that way. It reset properly, you could read the error channel but as 
>soon as you tried to actually load something from a disk it hung.
>
>In our case the problem was... the 6502. Once we replaced the CPU 
>everything worked, put the old CPU back in and the problem was back. We
>
>never explored it in detail, but wondered whether the SO-pin on the
>6502 
>the 1541 uses to tell the CPU that a Byte is ready stopped working. He 
>kept the CPU since there are other systems were it might still be
>useful 
>for.
>
>So if the CPU is in socket, try a different one.
>
>  Gerrit
>
>
>
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