Frye FONIX FP40D - Manual (Page 21)

Introduction 13
1.5.6 Right Side Mounted Jack and Module
Line input connector, IEC computer variety.
Dual “snap in” fuse holder.
Instrument will automatically choose the proper voltage.
1.5.7 Sound Chamber Mounted Jacks and Controls
Jacks Battery replacement pill jack. Microphone jack.
Controls Gain controls for microphones.
Found on the left side of the sound chamber, near te speaker.
Marked: Probe Gain and Ref. Gain.
1.5.8 Top of Instrument, Printer
Paper Release Lever
Printer Door
Figure 1.5.8—Electronics Module Top View