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Rear Panel
Power Switch (POWER)
The power switch is a three-
position type with the middle
position being the "off position.
The MX-104 should be operated
in the switch position which
produces the lowest amount of
system hum.
Speaker Jacks (SPEAKERS)
The speaker outputs are stand-
ard 1/4" phone jacks wired in
parallel. Speaker cables (recom-
mend at least #18 gauge wire)
should be connected between
the MX-104 and the speaker
systems prior to applying power
to the unit.
Caution - The MX-104 should
never be operated into less than
a 4 ohm speaker load.
Earth Terminal (GND)
Cord Wrap
The cord wrap is provided for
convenient storage of the power
cord when the MX-104 is not in
use.
Caution - The power cord should
always be completely removed
from the cord wrap prior to
operation of the unit. This will
insure maximum cooling of the
MX-104. For the same reason,
adequate clearance should be
maintained between the rear
panel and any other surface (4-6
inches should do). The vents on
the bottom and top of the MX-
104 are also provided for convec-
tion cooling. These vents should
be kept clear and open. Failure to
do so may cause thermal shut-
down of the unit.
AC Power Cord
The power cord is the three-wire
type with proper grounding faci-
lities.
Caution - The ground pin should
not be removed under any cir-
cumstances. If the MX-104 must
be used without proper ground-
ing facilities, a suitable ground-
ing adapter should be utilized.
Operation of the MX-104 with
proper grounding techniques
will result in less system noise
and greatly reduced shock
hazard.
Warning - To avoid possible
equipment damage and/or per-
sonnel injury, the fuse should
always be replaced with same
type and rating. Using improper
fuses will also void the warran-
ty. The MX-104 should always
be disconnected from AC outlet
prior to changing fuses. If fuse
repeatedly fails, the unit should
be referred to qualified service
personnel for repair.
Fault Protection Table
Fault
Excessive current due to
overloads.
Short circuits
(less than 0.4-ohm)
Temperature rise of heat
sink
(more than 105°C)
DC drift
Protection
Current limiter activates at
less than 2 ohm.
Current limiter activates,
input signal is lowered,
unit shuts down,
Input signal is lowered.
Unit shuts down.
Input signal is lowered.
Unit shuts down.
Indication
Compressor
LED illuminates.
Amp protection
LED illuminates.
Amp protection
LED illuminates.
Amp protection
LED illuminates.
Action
Remove excessive loads.
Minimum speaker loads
4
ohm.
Check speaker
lines/systems for shorts.
Check for adequate
ventilation.
Refer to qualified service
personnel.
Restoration
Automatic restoration
after normal loads are
obtained.
Turn off power switch.
Turn on into operational
loads.
Automatic restoration
after temperature
lowers (to 75° - 95° C)
Automatic restoration
after normal bias is
regained.
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