Installation manual

occurred since rough-in. Some phones might not
work with polarity reversed, so be particularly careful
to check the wire colors for proper polarity.
• If no fault is obvious, re-test as for rough-in.
✍
Take Note: If dial tone is not available, perform the same
tests as for rough-in before the jacks were installed. A split-
ting adapter may be necessary to test each line of each jack.
A toner can be used with a normal telephone or buttset to test
for dial tone. Most toners will provide an audible tone to the
phone as well as sufficient voltage to power the phone to
generate touch-tone or rotary dial digits.
Coaxial Cabling Tests
Be sure connections at coax splitters are sound.
Coaxial cable can be tested for continuity between
the SMC and the termination point. Connecting a
small, portable TV set to each video F-connector jack
will indicate cable continuity and whether signal level
is adequate. A snowy picture is an indication that sig-
nal level is too low. Make sure that all connections are
hand tight. You may need to add a video amplifier to
correct the problem. If your picture shows several
wavy lines and “ghosts images” in the picture, check
to make sure that all terminations without equipment
attached have the 75 ohm termination caps in place.
Handheld coaxial cable testers are available from sev-
eral manufacturers to simplify the above testing.
10.7 Speaker Cabling Tests
Testing of installed whole house speaker system:
Testing of the whole house audio system must be per-
formed before connecting the amplifier but after all
speaker and volume connections are complete. To
perform this test, conduct a walk-through of the house
and turn all of the volume controls to their highest set-
ting. If using the Digital Volume Control, power must
be applied to all of the volume control hubs before
testing.
After the above steps are complete, the next step will
be to measure the impedance of the load. The signal
that the speaker wiring and associated equipment
work with is on is a low level AC voltage. Impedance
is the resistance to an AC load and is often slightly
higher than the DC resistance that most multimeters
measure. It is therefore important that the meter which
is used is capable of measuring speaker impedance.
One such tool is the Audioplex "Impedicator".
Connect the meter leads to the jack that the amplifier
will be connected to. Test both left and right connec-
tions. The measurement must fall into the range of the
capabilities of the intended amplifier. This range will
be printed on the back of the amplifier near the
speaker terminals or in the specifications section of
the amplifiers owners manual. Do not connect the
speaker system if the measured load is below the
range of the amplifier or damage to the amplifier is
likely. If the measurement is more than twice the high-
est number in the amplifier's impedance range, dou-
ble check the settings on any analog volume controls
and be sure that all of the volume controls are at their
maximum settings. It is fine to have the system imped-
ance slightly higher than the range of the amplifier,
but if it is too high, the customer will experience dimin-
ished volume output.
If analog volume controls are installed in the home,
changing the system impedance is fairly simple. To
increase the total system impedance, turn the tap set-
tings in the smallest rooms to the next highest setting
(see the volume control instruction sheet for details on
this operation) then re-check the system load at the
amplifier location. This should correct any issues. If
the impedance does not change after increasing the
tap settings, you may have a short in the line.
Isolate suspected shorts or opens by disconnecting
each volume control one at a time from the 1X6 pas-
sive audio module until the problem is found.
When testing shows that the amplifier will see a load
in the acceptable range as discussed above, record
the final reading in your paperwork and connect the
amplifier. Before you power on the amplifier, be sure
to turn the volume in all of the rooms down to about
1/3rd volume. Set the volume on the amplifier to zero
and power it on. Select a source for testing (use a
known good source such as a CD player and a famil-
iar CD, as a familiar CD makes testing easier). Slowly
turn up the volume on the amplifier until it is at about
1/2 maximum. You should now hear the source play-
ing softly. Do not attempt to play things loudly now as
the amplifier could be pushed to distortion with the
room volume controls at 1/3rd. Now walk through the
house and turn up the volume control in each room.
Momentarily turning the volume to maximum in each
room will show any flaws in the room such as loose
screws on the speaker mounts or debris in the speak-
er. Now turn the volume back down and proceed to
each room repeating the test.
10-6
10
TESTING
Documentation
and Testing
For more information call your Leviton representative or the Leviton Technical Hotline at 800-722-2082
© Copyright 2001 Leviton Manufacturing Co., Inc.