[GreenKeys] Unidentified PCB in a 33ASR

[tomas at tlec.se]

Ok, I am convinced it is a relay board.

The resistor sits in series with the coil, the diode most probably a
fly-back/Freewheel diode.
Now the coil is connected between number  1 and 6 in the  J1 connector
assembly.

One end of the relay contacts is connected to the Reader PSU (BS241 card)
Edge contact number 3 and number 14 on J6 (card reader connector).
Reader PSU Edge connector 3 is a relay contact to the 0-terminal on the
18-9-0-9-18 Winding on the transformer.
The relay is operated with the Auto/Man switch on the right face-plate (not
standard 33 thing I guess)

The other end of the BS292 relay is connected to one of the circuits in the
Online/Local mode switch as well as number 12 and through a diode to 11 both
on J4 (motorconnector) 
In the scanned schematic I have, I cannot se whats connected on J4-11 and 12
on the other end, seems to be some sort of solenoid
It is allso connected to Edge connector 12 on the motor control board BS263
The Local/Online  Mode switch, when i Local shorts the relay contacts.
So, whats up?

I have done about 90% of the schematic, need to verify keyboard, reader,
printer and motor.


Mvh
Tomas Larsson
Sweden

-----Ursprungligt meddelande-----
Från: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net>
För Ed Groenenberg
Skickat: den 23 mars 2020 07:37
Till: greenkeys at mailman.qth.net
Ämne: Re: [GreenKeys] Unidentified PCB in a 33ASR


tomas at tlec.se wrote:
> Dear group.
>
> Can anyone identify this card in an European version of a model 33ASR
>
> The card is marked BS292 on the sticker, on the back of the card there 
> is a text "TZ-197"
>
> The Orange/White cable goes to Connector 1, cavity 6
>
> The Grey ones goes to connector 12 on the motorcontroller BS263 and 
> other places as well
>
> The Purple/White one goes to connector 6 cavity14,  connector 1 on the 
> tape reader card, and some more places as well
>
> The Blue cable  goes to Connector 1, cavity 1
>
> Mvh
>
> Tomas Larsson
>
> Sweden

I have a 50Hz machine, but this card is not part of it.
>From your description I would say it is the card which allows you to start
the papertapereader from the computer (and act thus as an input device).
Does the lever next to the reader have 4 positions i.s.o. 3 positions?

Ed
--
Ik email, dus ik besta &#128518;

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