Troubleshooting; Specifications - Radio Shack 3200026 User Manual

Troubleshooting

Problem
The mixer won't turn on.
There no signal from my input
sources.
I hear a humming noise from
the PHONO source.
I hear a humming noise from
another (non-PHONO) input
source.
I hear microphone feedback
(squealing).

Specifications

Input Sensitivity/Impedance
MIC 1 (Combo jack) ..............................................1.5 mV, 600 ohms, Balanced/Unbalanced
MIC 2 (PHONE jack) .............................................1.5 mV, 600 ohms, Balanced/Unbalanced
PHONO 1, PHONO 2 .....................................................................................3 mV/50 kOhms
LINE 1, LINE 2, LINE 3, LINE 4, LINE 5, LINE 6, LINE 7 ...........................150 mV/27 kOhms
USB Port
.................................................................................................................... USB 1.1
Output Level
Main Out ..........................................................................................................1.2V/10 kOhms
Record .........................................................................................................150 mV/10 kOhms
Frequency Response ......................................................................................20–20K Hz±3dB
S/N Ratio (for 1 kHz)
MIC ....................................................................................................................................60dB
PHONO .............................................................................................................................70dB
LINE ...................................................................................................................................80dB
Distortion
MIC ...................................................................................................................................0.20%
PHONO ............................................................................................................................0.08%
LINE ..................................................................................................................................0.05%
Solution
Check the AC power connection and make sure
the AC outlet is "live."
Check the power connections to the rest of system
(amplifier/receiver, input sources, and so on).
Check the fuse, and replace it if necessary.
Check the control settings of the mixer and the
input sources.
Ensure the proper connection between the mixer
and input sources.
Make sure TALKOVER/ON/OFF is not set to
TALKOVER.
Make sure the input source is turned on.
Make sure the PHONO 1 or PHONO 2 source's
ground wire is connected to the mixer's GROUND
terminal.
Make sure there are no low-level inputs connected to
the mixer's line input jacks.
Move the microphone farther away from the
output speakers or use a directional microphone.
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