There really isn't any way to test the power supplies yourself.

Our CE found the problem originally by taking the covers off the drives and
testing the voltages on the 2 power supplies inside.  The voltages were low,
and they were lowest on the oldest drives.
But, even if yours aren't low now, they WILL fail eventually if they are
still the old type.

Last fall there was an STK service alert about this.  They replaced the
power supplied not just with new ones, but with a different TYPE of power
supply.  Your CE should be able to check the STK data base for the service
alert, and just check the part numbers.

************************************************************************
Wanda Prather
The Johns Hopkins Applied Physics Lab
443-778-8769
wanda_prather AT jhuapl DOT edu

"Intelligence has much less practical application than you'd think" -
Scott Adams/Dilbert
************************************************************************






> -----Original Message-----
> From: Steven Bridge [SMTP:ccaasub AT UCL.AC DOT UK]
> Sent: Wednesday, July 07, 1999 6:59 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      STK 9714 problem resolved
>
> The library error we were getting :
>
> ANR8300E I/O error on library STKLIB (OP=00006C03, CC=304,
>  KEY=04, ASC=40, ASCQ=02, .... Description=Changer failure).
>
> appears to have been caused by one of the DLT7000 drives getting
> stuck in the 'handle down position'. This prevented tapes being
> loaded into drive. Our engineer was able simply to manually put
> the drive into 'handle up position' in which tapes can be loaded.
>
> Diagnosis of this was confused by the rash of other errors preceding
> this which I can only assume were caused by problems on the SCSI
> bus - which was resolved eventually by reseating all the cables ( and/or
> numerous reboots of library and server ).
>
> I would still be interested in how you determine whether your drives
> have the power supply problem described elsewhere - if anyone happens
> to know.
>
> +----------------------------------------------------------------------+
>  Steven Bridge     Systems Group, Information Systems, EISD
>                           University College London
>  email: s.bridge AT ucl.ac DOT uk                   tel: +44 (0)20 7679 2794