DBZ DMi 2/4000A Benutzerhandbuch - Seite 18

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Failure phenomenon
"PROT" indicator
in long-time on
The background
noise is loud
One Channel has
no output

Distortion

16

Troubleshooting

Possible Reasons
Short circuited
between amplifier
Output Connection +/-
Amplifier has DC output
Working mode switch
bad connection
Wrong connection of
signal cables
Line-induced
interference
Check if mode switch
on rear panel is set
correctly
Signal cable or
speaker cable
connection abnormal
Mode switch is not
toggled in place
Short circuited
between amplifier
output cables
Signal cable problem
Related Circuit
Short-circuit protection
DC protection
Input signal board,
circuit switch part
- --
- --
Mode Switch
___
Mode switch
- --
___
Measures
Disconnect the power
cable to check if the
failure is removed
Please contact the
factory service center
Dial mode switch
repeatedly to check.
XLR: Pin 1 to Ground,
Pin 2 to +, Pin 3 to -.
Set the sensitivity to
32dB then adjust the
pre-amp processor.
Toggle the mode switch
several times to see if it
returns to normal status
When the signal light
is normal, please check
the speaker cables
Toggle the mode switch
several times to see if it
returns to normal status
Insert another
speaker cables
Listen to the sound
and check if it's
normal when change
another signal cable