From Tučňák Wiki
Microphone
IC-706 microphone pinout
Front panel
Power consumption from 8 V is 300 mA including illumination.
IC-706 front panel schematics
Phones on front panel
IC-706 phones/speaker on front panel
CI-V
IC-706 CI-V pinout/schematics
ACC socket
IC-706 ACC socket
Data socket
IC-706 Data socket
References
Front panel IC-706