[R-390] R-388 question

[Jim Whartenby]

On the bench is a R-388 with a defective Break-in switch mounted in place of the speaker jack on the front panel.  Turns out that the switch was not connected to the wiring harness.  A check of the various R-388 manuals on hand does not show how this switch was connected.  Change 2 of TM 11-854 mentions the Break-in switch but there is no other information.
Does anyone have a link to a schematic that shows this Break-in switch?Regards,Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy