Well, I finally got around to testing the PSU on my 11/34. I measured at the
backplane connectors with no backplanes plugged in. Everything checks out
except for the -5V and +20V. Accordingly, the LED at the bottom of the H745
brick (regulator 1) does not light. However, some of the other voltages
coming from the H745 (according to the BA11-K FMPS) seem to be OK.
Does anything in the machine even need -5V or +20V? If not, can I leave the
bad brick in place? I have: KD11-EA, KY11-LB, DL11-W, MS11-JP, M7850 parity,
DZ11-A, RK11-D. I'll be adding a RX11 at some point. Someone enlighten me,
please. :-)
I'm pretty sure I have a spare brick.
Also: what are these signals on the 6-pin backplane mate-n-locks?
- AC LO
- DC LO
Something I learned: If you have a H785 brick in your 11/34 BA11-KA cabinet,
ignore what the 11/34 and KY11-LB manuals say about battery backup and the
rotary power switch. You can indeed have a battery backup with a BA11-K, and
the switch on the KY11-LB works as you think it should. You must connect the
ribbon cable from the H785 to the corresponding connector on the KY11-LB, or
the H785 won't work. You must NOT connect the one-wire connector from the
H785 to P4(?) of the AC input box, or else your machine won't turn off,
regardless of the rotary switch. Clear as mud?
--
Jeffrey Sharp
Received on Mon Mar 03 2003 - 23:06:00 GMT