Clear-Com RS-603 (No longer available) - Manual (Page 51)

R S - 6 0 3 / 6 2 3 / R B E L T P A C K S 4 9
TROUBLESHOOTING
PROBLEM Low audio level.
CAUSE Multiple terminations on the line. Excessive
capacitance and/or resistance due to cable
length and/or gauge.
SOLUTION If connected to more than one main station
or power supply, check that there is only
one termination per channel.
PROBLEM Call light stays on.
CAUSE DC voltage present on audio line pin 3.
SOLUTION Check cables for shorts and cross-wiring.
Make sure there is a termination on the
channel.