JBL MS 8 Owners Manual

TROUBLESHOOTING
If your MS-8 doesn’t seem to be working the way it should, read this section to
see if the problem and possible solution are listed here. If, after you try all of the
solutions listed here, the problem persists, contact JBL Customer Service at
516.255.4JBL (4525).
POWER
Symptom
The power LED does not
illuminate.
The power LED illuminates,
but the display does not
illuminate.
SOUND
Symptom
There is no sound in all
channels.
Possible Cause
The +12V, Gnd or Rem In
terminals are not properly
connected.
The fuse is blown.
The display is not properly
connected.
The MS-8’s microprocessor
needs to be reset.
Possible Cause
Improper input connections.
Calibration/setup procedure
has not been performed.
Incorrect input is selected
on the MS-8
The MS-8’s System Volume
is turned all the way down.
The head-unit or source-unit
volume control is turned all the
way down.
Solution
Confirm that all power
connections are correctly
made according to this
manual. See Connections:
Power, on page 5.
Replace the fuse with an
identical 25A fuse.
Check the connections at
display and at main unit.
See Connections: Display,
on page 14.
Press Reset button with a
pen or similar object. See
Resetting the
Microprocessor, on page 41.
Solution
Confirm that all the required
channels of the source unit
are properly connected. See
Audio Inputs, on page 7.
Perform the calibration/
setup procedure. (The
procedure must be
performed before the MS-8
will pass an audio signal
through to its outputs.) See
Calibration/Setup, on page
24.
Select the correct input
using the MS-8’s Input
Selection menu. See Input
Selection Menu, on page 35.
Set the MS-8 System
Volume at –20dB. See
Acoustic Calibration, on
page 32, and Volume Up
and Volume Down Buttons,
on page 35.
Turn the head-unit or
source unit volume up to a
normal level.
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