Troubleshooting - True Systems Precision 8I Bedienungsanleitung

Troubleshooting

Symptom
no signal output.
Main power switch on
PSU is on, but no LED's
are illuminated.
no signal output.
Main power switch on
PSU is on and some LED's
are illuminated.
Output signal is distorted.
Outputs are connected
for balanced operation.
Output signal is distorted.
Outputs are connected
for unbalanced operation.
Hum can be heard in the
audio program.
Channel 1 signal can be
heard in Channel  output
and vice versa.
channel 2 seems to have
no output when used
with Channel 1 as a ste-
reo pair.
In MS mode the stereo
channels are reversed
(Channel 1 is Right and
Channel  is Left).
In MS mode the stereo
channel phasing is incor-
rect.
4
PRECISION 8i
Solution
Check power connection with external PSU and AC power cord.
• Check fuses (pull fuse drawer under power cord inlet)
• Check status of phantom power.
• Check continuity of mic and electric instrument cables.
• Check continuity of output cables.
• Make sure gain is adjusted so that the OL indicator does not acti-
vate 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 GAIN
selector to match capability of device or monitoring system, then
adjust gain control according to indications on the Level Indicator
LED's.
• Check continuity of output cable.
• Make sure outputs are not connected to a load impedance of less
than 00 ohms.
• 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).
• Disconnect grounding LINK.
• Check continuity of output cables (particularly shields).
• Disconnect shields on one end of output cables. Connect grounding
LINK.
• Check status of MS selector. It should be OFF for individual channel
mode and ON for MidSide mode.
• Check status of MS selector. It should be OFF for individual channel
mode and ON for Mid/Side mode.
• Make sure the 180º selectors for both Channels 1 and  are OFF.
• Make sure the front of the bidirectional "Side" mic is aimed 90
degrees to the left of the axis of the "Mid" mic. Alternatively, select
180º on Channel  to reverse channel positions.
• Make sure the 180º selectors for both Channels 1 and  are in the
same position.
TRUE systems