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Troubleshooting Guide
Always visually check the phone for loose or shorted wires, physically
damaged, or missing components. The phone will not work on a Digital
phone line. It will only work on an Analog phone line or an Analog port
from a Digital phone system.
Problem: Phone would not turn ʻONʼ
Possible Cause:
• Check phone line connection
• Check phone line voltage (normal C.O. line 48-52VDC or 20-
35VDC – internal systems)
• Try connecting a fully charged 9-Volt battery
• Make sure phone line is connected to the green connector at TEL or
the P1 (TELCO) modular phone jack if available (see P.C. Board
Diagram)
• Check if unit is pulling down line voltage (you should read the
same as the phone line voltage)
• Check voltage at controller
• Check button connection
• On an OEM style phone, remove button connector and try shorting
button connection at BUT pins
Problem: Phone dials incorrect number
Possible Cause:
• Check number programmed into phone
• Plug a phone in the jack and call the same number you are trying
to program to see if you can call out
• Check to see if the phone is on a ring down line
• Check to see if another auto dialer is on the line and remove it
• Reprogram unit
Problem: No sound through the speaker
Possible Cause:
• Check speaker connection (see P.C. Board Diagram)
• Try calling into unit and speaking to person in the car
• Measure the resistance of the speaker which should read
approximately 40-45ohms
• Make sure the speaker is not physically damaged
Problem: Noise on the line
Possible Cause:
• Check if twisted shielded pair was used
• Check if shield was connected to ground at the controller end only
• Measure AC voltage on line, it should be zero
• Check button connection
• Try a spare pair of wires through traveling cable
• Check if wire is running through hoistway by itself
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