13
Appendix A: Service Information
One side is way louder than the other
• Are both Level controls set to the same position?
• Check your source signal to make sure the left and
right signals are balanced.
• Are the speaker impedances matched? Different
speaker loads can cause different volume levels
on each side.
• Try switching sides: Turn off the amp, swap the
speaker cables at the amp, turn the amp back on.
If the same side is still louder, the problem is with
your speaker cabling. If the other side is louder
now, the problem is with the mixer, the amp, or the
line-level cabling.
The stereo music sounds kind of
sideways, and the bass frequencies
diminish when standing center, but
get louder as you approach one side
• Check the polarity of the speaker cable
connections. You may have your positive and
negative reversed at one end of one speaker
cable.
As soon as the music gets loud, the
amp shuts down
• Check the OL LEDs and make sure that they are
not lighting continuously. If they are, turn down the
signal source or the Level controls on the amp.
• Can the amp breathe? The amplifi er draws its
ventilation air in from the back. It needs plenty of
fresh air to stay cool.
Do not block the ventilation
holes.
I hear thunder, even when the
amplifi er is turned off
• It’s going to rain. Get inside quickly. Bring the
amplifi er with you.
Poor sound
• Is it loud and distorted? Turn down the signal
coming from the mixer or signal source.
• Is the input connector plugged completely into
the jack? Check the speaker connections and
verify that all connections are tight and that there
are no stray strands of wire shorting across the
speaker terminals.
• If possible, listen to the signal source with
headphones plugged into the console. If it sounds
bad there, the problem is not in the amplifi er.
Warranty Service
Details concerning Warranty Service are spelled
out in the Warranty section on page 19.
If you think your amplifi er has a problem, please
do everything you can to confi rm it before calling for
service. Doing so might save you from the deprivation
of your amplifi er and the associated suffering.
These may sound obvious to you, but here are
some things you can check. Read on.
Troubleshooting
No Power
• Our favorite question: Is it plugged in? Make sure
the AC outlet is live (check with a tester or lamp).
• Our next favorite question: Is the POWER switch
on? If not, try turning it on.
• Is the red LED next to the POWER switch
illuminated? If not, make sure the AC outlet is live.
If so, refer to “No Sound” below.
• Has the BREAKER switch popped? Try pushing in
the BREAKER switch. If it pops out again right away,
refer to “Repair” on the next page.
• The AC fuse inside the amplifi er is blown. This is not
a user-serviceable part. Refer to “Repair” on the
next page to fi nd out how to proceed.
No Sound
• Are the channel Level controls turned up? Slowly
turn them up and see if you hear anything.
• Is the signal source turned up? Make sure the
signal level from the mixing console (or whatever
device immediately precedes the amplifi er) is high
enough to produce sound in the amplifi er. The SIG
LEDs should be blinking to indicate that signal is
present.
• If the speakers are wired for BRIDGE mode, make
sure the AMP MODE switch is set to BRIDGE.
• If the amplifi er has gotten extremely hot, the
thermal protection circuit may have activated.
Allow the amplifi er to cool down and normal
operation should resume.
• Are there fuses in the speakers, or in-line fuses in
the speaker wire? Check ‘em to see if they’re
blown.
• Make sure the speakers are working properly.
Summary of Contents for Juice J-1400
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