[GreenKeys] Model 33 ASR (Teleprinter Version (European)) Strange circuit boards and switches.

[tomas at tlec.se]

Trying to get my heads around how it is wired.

I got a german schematic from one here in the group, showing the Teleprinter
made modifications.

Now it is about 90 % the same, however there is som differences.

The Line/Local mode switch has only two modes, Line and Local. But it has 7
different switch segements instead of the 4 shown in the schematic.

THere is two buttoms with internal light on the face-plate, however the are
not dubble throw, as one would expected, they are marked with te facia text
"Auto/Man" and "Leser/Schrittt".

The Connector J1 (assume it is the serial connection) has 7 connections, one
going to a PCB with unknoown functions called BS292

The BS 292 has three components one diode, one 220 ohms resistor and a white
rectangular box with unknown function (4 Connections).

The board is bolted at the base between the BS 270 and the BS263 headers 

BS 292 is wired up with 4 wires,

Connection named 11+ goes to J1:3

Connection named 13 goes to two grey wires to the board BS263:12  (motor
Board and the other boards as well)

The connection named 14-18 goes to connector J6:14

 

Furthermore J4:8 and5 are linked 

J4:6 is not connected as well as J4:14 and J4:5

 

On the schematic there is something called SFK 26R, havent got a clue what
it si, connected between J7:11 and J8:1

The BS 230 board (Selector Magnet amplifier) is not the same as on the
drawing R11 is missing, and replaced by a link.

The BS272 board on the drawing is actually BS270 only 2 resistors one cap, 2
diodes and 2 fuses

 

So, can anyone share som light over this?

I havent had any time yet to actuallay reverse engineer all connections,
this is, I thingk the largest differences, I will however do a full reverse
and do a schematic.

But, still what are the two extra switches for, and what is that extra
circuit board

 

 

Mvh

Tomas Larsson

Sweden

 

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