Page
8 of 26
Model 298 ADA-Compliant Emergency Telephone
Pub. 42004-304A
f:\standard ioms - current release\42004 instr. manuals\42004-304a.doc
06/02
MICROPHONE SENSITIVITY AND SPEAKER VOLUME ADJUSTMENT
The speaker volume and the microphone sensitivity controls are factory set to a nominal value. These
settings yield acceptable results in all but a few applications. When adjustments are necessary, follow
these steps:
1.
Loosen the 6 tamper-resistant screws on the front panel using the GAI-Tronics Model 233 Tamper-
Resistant Screwdriver (sold separately). Open the front panel. The telephone should remain plugged
in.
2.
Locate the Microphone Sensitivity Potentiometer (
R27
) and the Volume Control Potentiometer (
R41
)
on the PCBA. See Figure 3 for the location of
R27
and
R41
.
3.
Have someone call the emergency telephone. For best results, place the call to the emergency telephone
from another room using a handset-type telephone.
4.
Check the microphone sensitivity by speaking at various distances from the telephone. Adjust the
Microphone Sensitivity Potentiometer (
R27
) to the desired level. Rotating
R27
clockwise increases
the sensitivity.
5.
To adjust the speaker volume: while the caller is speaking, adjust the Volume Control Potentiometer
(
R41
) to the desired level. Rotating
R41
clockwise increases the volume level.
Note
: If the speaker volume is high, the microphone sensitivity must be reduced accordingly to avoid
feedback problems.
Programming Instructions
This telephone can be programmed from a remote location (see the Remote Programming section on
page 8) or from the telephone’s front panel keypad (see the Local Programming section on page 9).
For remote programming, a touch-tone (DTMF) telephone connected to a separate central office (CO) or
private branch exchange (PBX) line is required.
REMOTE PROGRAMMING
The programming mode is accessed by dialing a four-digit programming password. Should it become
necessary to bypass the password protection feature, see the Password Disabled Programming section on
page 9.
Password Enabled Programming
1.
Enable the password protection feature—insert the
J9
jumper on pins 1 and 2.
2.
Enable the auto-answer feature—insert the
J2
jumper on pins 1 and 2.
3.
Using a touch-tone telephone, call the emergency telephone. The emergency telephone automatically
answers the call and generates a splash tone followed by a success tone (single beep).
