Vintage Synth Repair

From: "lighterthanairflight@... [vintagesynthrepair]" <vintagesynthrepair@yahoogroups.com>
To: vintagesynthrepair@yahoogroups.com
Sent: Friday, October 17, 2014 12:56:01 PM
Subject: [vintagesynthrepair] mutron biphase din jack wiring
 












hello,  I just bought a replacement din jack to replace the one removed from a mutron biphase.   But because the wiring was disconnected..  I do not know the pinout of the din jack.   the schematic shows 3 of the 5 connections to the pedal,  but the others are not labeled. 








anyone have the pinout or have a picture of the din jack from the back?  








I have searched the internet with no luck,  any help would be much appreciated.


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Here's what I came up with:






J6 pin 1 - NC


J6 pin 2 - pedal in


J6 pin 3 - pedal switch A


J6 pin 4 - pedal switch B


J6 pin 5 - NC






The outside metal case of the cable connector  gives the ground connection, so 3 pins are all they need. They probably already had a bunch of 5-pin connectors, and purchasing additional 3-pin connectors just for this would not have been a financially sound decision. And they must not have found it necessary to include the unused connections in the schematic.