Power Switch (POWER)
The power switch is a three-
position type with t h e middle
position being the "off position.
The
MX-401
should be operated
in the switch position which
produces the lowest amount of
system hum.
Speaker Jacks (SPEAKERS)
The speaker o u t p u t s 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-401
and the speaker
systems prior to applying power
to the unit.
Caution
- The
MX-401
should
never be operated into less t h a n
a 4 ohm speaker load.
Earth Terminal (GND)
AC Power Cord
The power cord is the three-wire
type w i t h proper grounding faci-
lities.
Caution
- The ground pin should
not be removed under any cir-
cumstances. If t h e
MX-401
must
be used w i t h o u t proper ground-
ing facilities, a suitable ground-
ing adapter should be u t i l i z e d .
Operation of t h e
MX-401
w i t h
proper grounding t e c h n i q u e s
will result in less system noise
and
greatly
reduced
shock
hazard.
Cord Wrap
The cord wrap is provided for
c o n v e n i e n t storage of t h e power
cord w h e n t h e
MX-401
is not in
use.
Caution
- The power cord should
always be c o m p l e t e l y removed
f r o m t h e cord wrap prior t o
o p e r a t i o n of t h e u n i t . This w i l l
i n s u r e m a x i m u m cooling of t h e
MX-401
For t h e same reason,
a d e q u a t e clearance s h o u l d be
m a i n t a i n e d b e t w e e n t h e rear
panel and a n y o t h e r surface (4-6
inches should do). The v e n t s on
t h e b o t t o m and t o p of t h e
MX
-
401
are also provided for convec-
t i o n cooling. These v e n t s s h o u l d
be ke p t clear and open. F a i l u r e t o
do so may cause t h e r m a l s h u t -
down of t h e u n i t .
AC Fuse
Warning
- To avoid possible
e q u i p m e n t damage and/or per-
sonnel i n j u r y , t h e f u s e s h o u l d
a l w a y s be replaced w i t h same
t y p e and r a t i n g . Using i m p r o p e r
fuses w i l l also void t h e warran-
t y . The
MX-401
s h o u l d a l w a y s
be d i s c o n n e c t e d f r o m AC o u t l e t
prior t o c h a n g i n g fuses. If f u s e
r e p e a t e d l y f a i l s , t h e u n i t s h o u l d
be referred t o q u a l i f i e d service
p e r s o n n e l f o r r e p a i r .
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
A u t o m a t i c restoration
after normal loads are
obtained.
Turn off power switch.
Turn on into operational
loads.
A u t o m a t i c restoration
after temperature
lowers ( t o 75° - 95° C)
Automatic restoration
a f t e r normal bias is
regained.
— 4
—
Rear Panel
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