GAI-Tronics 297-003RT4 Retrofit S.M.A.R.T. ADA-Compliant Emergency Phones - Manual (Page 9)

Pub. 42004-355G
R ETROFIT ADA-C OMPLIANT S.M.A.R.T. E MERGENCY P HONES P AGE 8 of 17
f:\standard ioms - current release\42004 instr. manuals\42004-355g.doc
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Figure 8. 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.
After making any adjustments to the audio levels, perform the automatic line level compensation as
detailed in the programming section of this manual.
When the phones leave the factory, the microphone potentiometer is set near minimum, and the speaker
pot is set to maximum. The speaker volume potentiometer (R106) provides 6 dB range of adjustment and
the microphone sensitivity potentiometer (R88) provides 12 dB range of adjustment.