SSL 292 G EQ potentiometer connection error?

[gertius]

Hi guys,
maybe one of you can help me with this.
Iīm in the process of writing up a guide for switching out a G EQ card for an E card in a G channel.
While I have applied the mod to already to 4 channels and it works perfectly, when writing it up I detected an inconsistency with the schematics that left me puzzling. Now I donīt want to release my guide until I can figure this out, not to spread errors.

In the 292 G EQ schematic there is the part where it shows the 10pin header connector SM1 for HF F and how itīs connected to the pot, see screenshot. It shows pin 1 connected to one side and pin 2 connected to the wipers and the other side.
However in the pics of the actual pot (only had a pic of an already modified one, but I didnīt touch the wire connections) you see that pin 1 (black cable) is connected to the wiper with one side and pin 2 no wiper and other side. This should theoretically invert the pot I guess, but itīs working correctly.

Can someone please help me understand? Is it irrelevant which side the wiper is connected to? Is this an error in the schmatic?

Best,
Christian

[walrus]

Yes it is irrelevant, all the card sees is a change from 0 to 47k Ohms (22k when G).
The important part is which end of the pot is connected to the wiper, or it will work backwards!

[gertius]

Thanks for your reply!
I understand that the card only sees the change in resistance and your reply helped making that clearer to me.

The important part is which end of the pot is connected to the wiper, or it will work backwards!

But that is really what Iīm asking.
My description might have been a little unclear but that is what it boils down to.
The end of the pot that is connected to the wiper seems to differ between schematics and reality.
To my understanding the pot in the schematic should be mirrored to reflect reality, this is what makes me uncertain if I got it right.
Can anyone confirm this or explain it?

[gertius]

Ah sorry, I think I got it now.

The little dot in the schematic denotes orientation of the potentiometer, clockwise.
Because the terminal without the dot is connected to the wiper, it needs to be the counterclockwise terminal (or the left one in the picture, when pot knob is at the top).
This is correct in reality.

Which way the pot is then connected to the card does not matter as the card only sees the total resistance.
This is why a discrepancy between schematic and actual wiring does not matter in this regard.

Thanks again for your reply!

[walrus]

No problem, glad all is now clear.