RX02 Difficulties

[Jerry Weiss]

> On Dec 8, 2017, at 12:53 PM, Aaron Jackson via cctalk <cctalk at classiccmp.org> wrote:
> 
>> On Fri, Dec 8, 2017 at 3:03 PM, Aaron Jackson <aaron at aaronsplace.co.uk> wrote:
>>> 
>>> Manual says it should be S1=off, S2=on for RX211 and RXV21
>> 
>> In the photo, I think S1 is on and S2 is off. Check them with an
>> ohmmeter if in doubt!
>> 
>> -tony
> 
> Yes - you are right. I switched them back to how they were when I got
> the drive. I think one of the switches was half down because XXDP
> actually does something now.
> 
> Most of the tests now look something like this:
> 
> CZRXFB0 DVC FTL ERR  00034 ON UNIT 00 TST 031 SUB 000 PC: 003476
> SECTOR ADR - LGC TST
>  SECTOR ADDRESS ERROR
>       EXPECTED SECTOR=18.
>         TARGET SECTOR=17.
> 
> I suppose these should match?
> 
> Starting to think I might need to confuse myself with my logic analyzer
> and the RX02 control board.
> 
> Thanks,
> Aaron.

To isolate the problem further, try to see if any of the errors follow
the media  as you move them between drives.  

If the same errors occur on both drives, regardless of media then the
RX02 system board or perhaps the Qbus controller are at fault.  
The field maintenance prints should allow you to trace the fault down
a bit further,  with or w/o a logic analyzer.

How many different types of errors do you see?

Jerry