
6
Troubleshooting
1. If the SHW-MRI-1 does not turn ‘ON’ make sure that the
wall transformer is plugged into 110VAC outlet, and
measure the voltage on the “POWER” connector inside
the SHW-MRI-1 unit. The voltage should read about 24-
28VDC. The “POWER” connection is not polarity
sensitive.
2. If the SHW-MRI-1 turns ‘ON’ but does not call the ADA
elevator phone: Check all your connections according
diagram on Figure 1. Press the Button to make a call
and measure the maximum AC voltage coming from the
elevator port using a voltmeter.
Note: The normal ring voltage generated by the SHW-MRI-1
unit is about 60-80VAC. USE CAUTION WHEN
MEASURING RING VOLTAGE ON THE LINE.
3. If the ADA elevator phone does not call out: Check the
voltage of the phone line on the “Telco” connector of the
SHW-MRI-1 unit. The same voltage should be shown on
the “Elev.” connector of the SHW-MRI-1.
Note: The normal phone line voltage is about 24-52VDC.
There are cases that the voltage might drop bellow 24VDC if
the phone line connection is located far away from the
central office or an internal phone system is used.
4. If the ADA elevator phone (JANUS-ADA phone) sounds
low you can call in and when the phone answers press 9
and listen for 3 beeps. You can repeat this step one
more time to adjust the speaker volume to the maximum
level. If you have an older EMS-HFP phone you can
adjust the R13 (VOL.) potentiometer counter-clockwise
to the max. If it’s still low add a 9-volt battery to the
battery lead of this phone and try again.