TRUE Systems PRECISION 8 - Manual (Page 16)

Precision 8 OPERATION MANUAL
16
TROUBLESHOOTING
Symptom
No signal output. Main power switch
is on, but no LED’s are illuminated.
Solution
• Check AC power source and cord.
• Check fuses (pull fuse drawer next to power
cord inlet)
No signal output. Main power switch
is on and green power LED is
illuminated.
• Check status of phantom power.
• Check continuity of mic and electric
instrument cables.
• Check continuity of output cables.
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.
Set PEAK REFERENCE selector to match
capability of device or monitoring system,
then adjust gain according to indications on
the Peak-Hold LEDs.
• 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
operation.
• Make sure the minus (-) output signal pins are
connected to the shield and not left
unconnected. See “Output Cable Connection”
section.
• Check troubleshooting tips for balanced
operation (above).
Hum can be heard in the audio
program. • Set ground lift switch to LIFT.
• Check continuity of output cables (particularly
shields).
• Disconnect shields on one end of output
cables. Set ground lift to the grounded
position.
• If both outputs (TRS, DB25) are in use, try
disconnecting shields on DB25 only, or TRS
only.