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KC341-B help understanding the circuit diagram please - MPS - KC7341 too

I

iainmaoileoin

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Dec 24, 2014
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I am starting to look at putting one of Jorgs boards behind my KC341-B (some manuals call it a KC7341 AKA MPS). This is a long-term project and I am just in the initial stages - understanding the diagram and planning the wiring. I have not applied power to the board yet. I am that early in the day.

Here are my problem - based on http://www.bitsavers.org/pdf/dec/mps/docs/MPS_KC7341_EngDrwg.pdf
  1. power.
    power.jpg
    Why is the 15v shown connected to the 5v rail? What am I misunderstanding? The resistor divider I understand (They use a lot of 3V signals on the board). They seem to use 3v rather than lots of pullups from the 5v rail for signals that are always tied high. I have not yet avo-ed the board, so I cant comment if the wee diagram is reality *it cant be* or not.
  2. Use. Has anybody on the forum any experience of these units? I dont have a M7341 to play with, so I can only go on what the manual says.

Any input appreciated..
 
That circle/square symbol is likely a testpoint on the board which is mis-labeled (either on the board or the schematic or both).

CRW
 
of course

of course

Bitly said:
That circle/square symbol is likely a testpoint on the board which is mis-labeled (either on the board or the schematic or both).

CRW
Click to expand...

Ta. That makes sense. The board is encased at present and I have not opened it up. Still on the "will do I this next" phase. I think it is a christmas project.
 
g4ugm said:
Indeed, the top of the first board shows +5 and -15v supplies... no +15...
Click to expand...
The external case is stamped with +5, -15 and ground. But I had not considered the scan! I was just happy to find the document and not to have to reverse engineer the board ;-)
 
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