TRUE Systems PT2-500 - Manual (Page 12)

pT2-500 Microphone Preamplifier OPERATION MANUAL
Version 1.0 12 ©2010 TRUE SYSTEMS
TROUBLESHOOTING
Symptom Solution
No signal output. Main power switch
on rack power supply is ON, but no
LED’s illuminate on
pT2-500.
 Check AC power source and cord connection
 Check fuse on rack power supply.
 Check that preamp card edge connector is
properly seated.
No signal output. Main power switch
on rack power supply is ON and
appropriate LED’s illuminate on
pT2-500.  Check status of phantom power.
 Check continuity of mic and electric
instrument cables.
 Check continuity of output cables.
 Make sure GAIN control is adjusted.
Output signal is distorted. Outputs
are
connected for balanced
operation.
 Make sure GAIN is adjusted so that the OL
indicator does not activate during the audio
program.
 Make sure the high output capability of this
unit is not overloading the device or
monitoring system to which it is connected.
 Check continuity of output cable.
 Make sure outputs are not connected to a
load impedance of less than 600 ohms.
Output signal is distorted. Outputs
are
connected for unbalanced
operations.
 Make sure the minus (-) output signal pins
are connected to the shield and not left
unconnected.
See “Output Cable
Connection” section, page 9.
 Check troubleshooting tips for balanced
operation (above).
Hum can be heard in the audio
program.  Check continuity of output cables
(particularly shields).
 Alternatively, disconnect shields on one end
of output cables (not appropriate for
unbalanced connections).
Electric instrument connected to a
Direct Input does not produce a
signal or signal is distorted.  Check continuity of electric instrument
cables.
 Check the batteries or AC power source of
any “foot pedal” effects processors
connected to the Direct Input.
 Make sure that the instrument cables have
standard tip-sleeve ¼” phone plugs.