7 Mar
2005
7 Mar
'05
3:28 p.m.
-The one big problem it has is its lack of a reader
power supply. The last
Can't you grab it from your wrecked ASR33 (or did you manage to get that
one going in the end)?
owner got it from a government surplus program, but
they neglected to
supply anything but the unit itself... and so no reader supply. Does
somebody have the schematic of one of these so I can build a new one?
I will ahev to hhunt, but I may have it. Isn't it in the DEC ASR33
diagrams (which are on bitsavers?)
-Right now the unit is doing a lot of chattering on
both Line and Local
when powered on. Initially I thought something might be mechanically wrong
In Line mode that might be right. The unit will 'space out' (telegraph
term) if there's no current in the recieve loop. The receiver side will
run continuously, it'll decode NULs and therefore not print anything.
In Local mode, it shouldn't do that, of course. Start by looking at the
transmit shaft and distributor brush (rear right of the typing unit). If
that's spinning all the time, then you do have a mechanical problem. Most
likely the typing unit came free from the base during shipping, or the
H-plate is not installed properly, something like that.
If the transmit side is not truning, then you may well have an electrical
problem. Most likly the receiving magnet (rear left of the typing unit,
near the punch) is not energixed. Maybe a fault on the call control unit
chassis.
due to being shaken around in shipping, say one of the
clutches on the
main shaft locking into an active position, but so far I haven't found a
culprit. I'm also wondering if I'm even looking in the right direction
for the problem, sooo here's the question: could the lack of a power
supply for the reader be causing this behavior? (The reader itself is
No. That is certainly not the problem.
-tony