19 Jun
1999
19 Jun
'99
7:06 p.m.
At 12:08 AM 6/20/99 +0100, Tony wrote:
This is what we used to call 'spacing out', I
believe. The receive
electromagnet is deenergised (for some reason - it shouldn't be), so the
receive cluth free-runs, etc.
Sounds like a good name.
If it's doing it in local mode, check :
1) The local loop PSU (the transformer + rectifier + multi-tapped
resistor in the call control unit chassis)
No CCU on this model, but I'll check this.
2) The transmit distributor (PCB + spinning contact in
the rear right of
the main chassis). It should be stopped. And there should be continuity
between the 2 wires on the schematic that are obviously the transmit loop.
Uh oh. It is spinning.
I'm trying to test this without the '8 plugged in for the moment. Should I
hook up some sort of bypass on the loop interface?
3) The selector magnet driver (the little
'module' in the call control
unit, consisting of a PCB + power transistor + ...).
4) The line/local relay contacts in the call control
unit.
This seems to work ok, when I switch it from local to line it settles down.
Well, is the transmit shaft (rear right, with the
distributor brush on
the end) turning? If so, then either it's stuck in here-is (in which case
the here-is drum behind it will be turning), or the keyboard is trying to
send something (check that the main chassis is correctly seated, that the
H-plate between the keyboard and the main chassis is fitted properly,
etc).
Here-is Drum is not turning but the tranmit shaft is. I'll have to check
the "h-plate" Now to find it on the parts diagram...
Thanks Tony,
--Chuck