27 Nov
2015
27 Nov
'15
2:29 a.m.
On 2015-11-27 06:13, Pontus Pihlgren wrote:
I can only say that they fail often. We have replaced
lots in
our 11/70. Luckily we have had spares.
Sometimes the failure has been rather catastrofic with blown
components. I think these modules run quite hot since
discoloured pcb:s are common.
I think we more often see failures in the H744(0) modules, but we've had
failures in both, yes.
Hot is a good guess, I think.
Johnny
/P
On Thu, Nov 26, 2015 at 01:01:07PM -0800, Ian Finder wrote:
> Hi folks,
>
> I've begun repairing my PDP 11/40 and have tracked down the first major issue to
the H745 (-15v) regulator.
>
> Before I dig into it, I just wanted to see if there are any common known failure
cases... Otherwise I'll just dive into troubleshooting it. :)
>
> Thanks as always-
>
> - Ian
>
> Sent from my iPhone
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol