Electronics > Repair

[Unigor 6e repair] Connection point for wire

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giosif:
Hi,

I am trying to repair a Unigor 6e meter and, upon disassembly, I noticed this black wire which, on one end, is connected to a potentiometer w/ on/off switch (the cable connects to one of the switch terminals of the potentiometer).
The other end of the wire, though, is not connected and I could not spot any solder traces on the board which might indicate the initial location this other end was connected to.
Would anyone have an idea where this cable is supposed to go?

Thanks!

coromonadalix:
schematic ?

https://elektrotanya.com/metrawatt_unigor_6e_analog_electronic_mm_1973_sch.pdf/download.html

giosif:
Thanks!

I tried using the complete set of schematics (the one you link is only a part of it, BTW), but I couldn't determine if that wire is supposed to be there in the first place (a bit strange the one end which is still connected has been soldered to the pot terminal this way vs. somewhere on the board) and, if so, where the other end should go.
Initially, I thought it might go to R35 on the next board, but that has its own inter-board link.

m k:
It's black, other one is red, my guess is GND.
Shape points to bit right where seems to be a hole.

When bottom slider is C~ the N-E knob is always grounding R32.

giosif:

--- Quote from: m k on April 07, 2024, 03:42:56 pm ---It's black, other one is red, my guess is GND.

--- End quote ---
Fair comment, although the fact that they use battery + as GND in the schematics makes it all confusing (and, in that case, our cable is not connected to GND).


--- Quote from: m k on April 07, 2024, 03:42:56 pm ---Shape points to bit right where seems to be a hole.

--- End quote ---
That was my initial thought as well, but the hole is to allow one of the terminals of the analog meter (or "dial"? not sure what to call it exactly - it's the "thingy" with the moving needle) to poke through when the board is seated in its intended position.
And that particular terminal of the meter/dial is not showing as connecting to GND in any of the schematics I've seen so far.
This said, the cable might still be supposed to go through that hole, but connect to something on the other side of the board, rather than the terminal.
However, given the length of the cable, there are not that many other locations on the other side of the board where it could connect and there are no visual clues that a cable has ever been soldered to any such potential locations.


--- Quote from: m k on April 07, 2024, 03:42:56 pm ---When bottom slider is C~ the N-E knob is always grounding R32.

--- End quote ---
I am not sure what you mean with "N-E knob"?

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