P S - 7 0 2 T W O - C H A N N E L P O W E R S U P P L Y
3 - 2
Table 3-1: Troubleshooting Tips
Hum or buzz in system
Inductive pickup caused by close
proximity of main or remote stations
to power lines or transformers.
Relocate offending unit.
10
Ω
chassis ground resistor is open.
Check the DC resistance for 10
Ω
between the chassis and pin #1 of
any intercom connector.
If this condition occurs, it is because the system ground came into contact with something that was
hot
with
respect to the power supply earth ground. If this occurs, carefully check the system ground and AC
distribution in the area.
This is a potentially dangerous situation. A shock hazard may exist between the metal boom of a remote
station headset and ground.
System feedback (acoustical)
Volume control at the remote station
is set too high.
Adjust.
Channel unterminated.
Set the PS-702
termination
switch
for that channel to the
on
position.
A headset extension cord was used.
Headset extension cords are not
recommended.
440 Hz tone is present on either
or both channels
Test tone feature is on.
Set the
test tone
switch to the
off
position.
Excessive crosstalk
High DC resistance in ground return. Use heavier cable; add additional
conductor(s) to ground return.
Multi-channel
cable pairs are not
individually shielded.
Replace cable with individually
shielded pairs.
Headset cables are not wired
properly or shielded properly.
Correct wiring. Use headsets with
properly shielded wiring.
Program signal sounds
distorted
Overload of
program in
circuit.
Reduce
program in
level or reduce
the gain of the program signal at the
source, such as an audio mixer.
SYMPTOM
CAUSE
SOLUTION
Summary of Contents for PS-702
Page 1: ...PS 702 TWO CHANNEL POWER SUPPLY I N S T R U C T I O N M A N U A L CLEAR COM ENCORE...
Page 4: ...P S 7 0 2 T W O C H A N N E L P O W E R S U P P L Y i i...
Page 12: ...P S 7 0 2 T W O C H A N N E L P O W E R S U P P L Y 1 6...
Page 20: ...P S 7 0 2 T W O C H A N N E L P O W E R S U P P L Y 3 4...
