GAI-Tronics 293-103 S.M.A.R.T. Externally Powered Emergency Phones - Manual (Page 11)

PUB. 42004-377C
S.M.A.R.T. E XTERNALLY P OWERED ADA-C OMPLIANT E MERGENCY P HONES P AGE
10 of 19
\\s_eng\gtcproddocs\standard ioms - current release\42004 instr. manuals\42004-377c.doc
08/06
Figure 7. Emergency Phone PCBA
Audio Level Adjustment
The speaker volume and microphone sensitivity are factory set to nominal levels that are acceptable for
most installations. However, some installations may require adjustments for the speaker and microphone.
Both the speaker and microphone adjustments are made using potentiometers on the emergency phone
PCBA. R106 is the speaker volume adjustment, and R88 is the microphone sensitivity adjustment. Refer
to Figure 7 for the potentiometer locations.
Special care must be given to adjusting the speaker volume and microphone level. If one or both of the
levels are set too high, acoustic feedback (howling) can occur. If acoustic feedback occurs, we
recommend returning both potentiometers to the nominal factory settings and beginning the adjustment
again from this point.