GAI-Tronics 294-103AL S.M.A.R.T Manuale - Pagina 11

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PUB. 42004-377C

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S.M.A.R.T. E

ADA-C

XTERNALLY

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MERGENCY

HONES

AGE

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.

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