NuTone IM-440 Series - Manual (Page 16)

16
TROUBLE
No radio, no intercom.
(No Display).
No radio, intercom working.
(AM/FM indicator on.)
Low or distorted radio
volume.
Weak and distorted music,
chime and intercom audio.
No electrical power.
Defective transformer.
Faulty Master Station.
Installation problem.
Antenna problem.
Incorrect volume setting.
Shorted or mis connected remote
speaker wiring.
Be certain 120VAC, 60Hz power has been provided to the primaries
of both 801T Transformers. No less than 16VAC should be
measured on the secondary of either Transformer.
Replace transformer.
Isolate Master Station from installation by removing ribbon cables
from terminal board and wait one minute for timeout. With power on,
radio should be playing at Master. If no radio, Master is probably
faulty. If radio plays, reconnect ribbon cables.
Check terminal board for shorted terminals or miswired cables.
Remove one 6-wire cable at a time to locate faulty line. When radio
comes on, check speaker connections and run continuity check of
speaker wiring.
Check for shorted antenna connection. Remove antenna connector
from tuner board and touch each pin with metallic object. If radio
plays, antenna is not functioning; be sure it is installed properly. In
weak signal areas, an outside antenna may be necessary. Also see
“Connecting the Radio Antenna”
Follow “Setting Program Audio Controls” instructions under
OPERATIONAL CHECKOUT.
This unit contains a protection device which opens if the audio
amplifier detects an overload condition. If the music, chime and
intercom audio becomes weak and distorted, remove power from the
master station for 10 minutes; this will reset the protective device. If
the audio returns to normal, the remote speaker wiring and remote
speakers should be checked for bare, shorted and/or mis-connected
wires. The problem must be found and corrected before the master
station will properly function.
POSSIBLE CAUSE POSSIBLE REMEDY
INSTALLER’S TROUBLESHOOTING GUIDE
Low or no intercom volume
from remote speaker in
MONITOR mode. Improper operation.
Program and Intercom Volume
Control adjustment.
Be sure remote speaker set for MONITOR has its volume control set
between
1 ⁄
2
and max, and receiving speakers have volume controls
set between 1 ⁄
2
and max. Follow “Setting Intercom Volume”
instructions in OPERATIONAL CHECKOUT.
Follow these instructions whenever the radio tends to overpower
transmissions from a remote speaker in the MONITOR mode. These
instructions will help you get the proper balance between the radio
and the monitored speaker.
1. Set system volume control to midpoint.
2. Set master to CD/TAPE or AUX position.
3. Adjust volume control for each remote station and speaker in
master station 3 ⁄
4
position.
4. Set master to AM or FM and tune to a strong AM or FM station.
5. Adjust program volume control for a desired listening level.
6. Increase Intercom volume control setting. Adjust clockwise to
desired monitor volume.
-Continued-