🚀 go-pugleaf

In article <8810@pitt.UUCP> jcd@pitt.UUCP (Jim Durham) writes:
> Second...if
>the MVII is dusty, check the voltage on the bus. The connectors from
>the power supply to the bus are cheesy and you can get over a volt
>of drop in the +5 supply. TTL doesn't work well on 4 volts.
> If you have an extender card, pull
>some module, put it on the extender, and measure with a digital
>voltmeter from ground to +5 on some chip.

1) There are test points behind the front panel cover (on a BA23)
that let you measure the +5 and +12 where it goes into the backplane.

2) The cable from the power supply to the backplane has been identified
by DEC as a known fire hazard, a mandatory ECO.  Field service will
replace it for you at no charge.  (at least they did for me)  The
new design of cable & connector seems much more reliable.  Last week
I had to shut down my MVII after 140 days of uptime, just because the
building was being re-wired.

-- 
        carl lowenstein         marine physical lab     u.c. san diego
        {decvax|ucbvax} !ucsd!mpl!cdl                 cdl@mpl.ucsd.edu
                                                  clowenstein@ucsd.edu