MFJ Enterprises MFJ-4125 User Manual

LIMITED
12
MONTH
WARRANTY
MFI
Enterprises,
Inc.
Warrants
to
the
original
owner
of
this
product,
if
manufactured
by
MFJ
Enterprises,
Inc.
and
purchased
from
an
authorized
dealer
or
directly
from
MFJ
Enterprises,
Inc.
to
be
free
from
defects
in
material
and
workmanship
for
a
period
of
12
months
from
date
of
purchase
provided
the
following
terms
of
this
warranty
are
satisfied.
11.
The
purchaser
must
retain
the
dated
proof-of-purchase
(bill
of
sale,
canceled
check,
credit
card
or
money
order
receipt,
etc.)
describing
the
product
to
establish
the
validity
of
the
warranty
claim
and
submit
the
original
of
machiné
reproduction
or
such
proof-of-purchase
to
MF)
Enterprises,
Inc,
at
the
time
of
warranty
service.
MFJ
Enterprises,
Inc.
shall
have
the
discretion
to
deny
warranty
without
dated
proof-
of-purchase.
Any
evidence
of
alteration,
erasure,
or
forgery
shall
be
cause
to
void
any
and
all
warranty
terms
immediately.
MFJ
Enterprises,
Inc.
agrees
to
repair
or
replace
at
MFJ's
option
without
charge
to
the
original
owner
any
defective
product
under
warranty,
provided
the
product
is
returned
postage
prepaid
to
MF)
Enterprises,
Inc.
with
a
personal
check,
cashiers
check,
or
money
order
for
$7.00
covering
postage
and
handling.
MFI
Enterprises,
Inc.
will
supply
replacement
parts
free
of
charge
for
any
MFJ
product
under
warranty
upon
request.
A
dated
proof-of-purchase
and
a
$5.00
personal
check,
cashiers
check,
or
money
order
must
be
provided
to
cover
postage
and
handling.
This
warranty
is
NOT
void
for
owners
who
attempt
to
repair
defective
units.
Technical
consultation
is
available
by
calling
(601)
323-5869.
This
warranty
does
not
apply
to
kits
sold
by
or
manufactured
by
MFJ
Enterprises,
Inc.
Wired
and
tested
PC
board
products
are
covered
by
this
warranty
provided
on
the
wired
and
tested
PC
board
product
is
retumed.-
Wired
and
tested
PC
boards
installed
in
the
owner's
cabinet
or
connected
to
switches,
jacks,
or
cables,
etc.
sent
to
MF]
Enterprises,
Inc.
will
be
retummed
at
the
owner's
expense
unrepaired,
Under
no
circumstances
is
MFJ
Enterprises,
Inc,
liable
for
consequential
damages
to
person
property
by
the
use
of
any
MFJ
products.
Out-of-warranty
Service:
MFJ
Enterprises,
Inc.
will
repair
any
out-of-warranty
product
provided
the
wnit
is
shipped
prepaid.
All
repaired
units
will
be
shipped
COD
to
the
owner.
Repair
charges
will
be
udded
to
the
COD
fee
unless
other
arrangements
are
made
This
warranty
is
given
in
lieu
of
any
other
warranty
expressed
or
implied.
MFJ
Enterprises,
Inc.
reserves
the
right
to
make
changes
or
improvements
in
design
or
mianufacture
without
incurring
any
obligation
to
install
such
changes
upon
any
of
the
products
previously
manufactured.
All
MFJ
products
to
be
serviced
in-warranty
or
out-of-warranty
should
be
addressed
to
MF)
Enterprises,
Inc.,
300
Industrial
Park
Road,
Starkville,
Mississippi
39759,
USA
and
must
be
accompanicd
by
a
lettcr
describing
the
problem
in
detail
along
with
a
copy
of your
dated
proof-of-purchase.
12.
This
warranty
gives
you
specific
rights,
and you
may
also
have
other
rights
which
vary
from
state
to
state
MFJ-4125 Instruction Manual
Thank you for purchasing the MFJ MIGHTYLITE Switching Power Supply.
The MFJ-4125 is designed to supply up to 25 amps intermittent or 22 amps continuous
current at 13.8 VDC.
Installation:
Before plugging the MFJ-4125 in an AC outlet make sure that the proper input voltage
is
selected
on
the
rear
of
the
unit.
Select
115
for
100/110/120
AC
operation.
Select
230 for 260/220/240 ac operation. MFJ-4125 is factory set for 115V.
The
loads
can
be
connected
to
either
the
5-way
binding
posts
or
to
the
quick
connectors.
Note
that
any
devices
requiring
more
than
5
amps
must
use
the
5-way binding
post
outputs.
The
quick
connectors
have
a
maximum
output
of
5
amps.
Operation:
The
MFJ-4125
has
a
fixed
output
at
13.8
VDC.
Alli
you
have
to
do
is
connect
the
output and tum the power switch to the ‘ON’ Position.
FAN:
The
cooling
fan
on
the
MFJ-4125
will
operate
when
the
unit
is
tumed
ON.
Protection:
The
MFJ-4125
will
automatically
shut
off
if
the
current
exceeds
25
amps.
To
reset,
turn
the
unit
OFF
and
wait
20
seconds,
then
tum
the
unit
back
on.
The
MFJ-4125
has
a
5
amp
AC
line
fuse
located
at
the
back
of
the
unit.
To
the
replace
the
fuse:
unscrew
the
fuse
cap,
remove
the
old
fuse,
and
replace
with
a
new
5
A
fuse.
Specifications and Features:
* 25 Amps MAX, 22 Amps Continuous at 13.8 VDC.
e Light weight, only 3.5 Ibs.
¢ Compact, only 5 1/2” W x 2 1/2” Hx 103/4"D
° Five-Way binding post for high current radios
® Quick-Connectors for low current accessories
e Over Voltage protection
e =©Over Current protection
¢ Quiet jnternal Cooling Fan.
e Input Voltage: Switchable AC input voltage
- 110 Vac at 47-62 Hz
- 220 Vac at 47-63 Hz
e Super Regulation:
Works
with
AC
input
from
85
to
135
Vac
or
from
170
to
260
Vac.
e _AC Line Fused (5 Amps)
e Meets FCC Class B
* No Matter What one year limited warranty

MFJ Enterprises MFJ-4125 Specifications

General

Output Voltage	13.8 VDC
Cooling	Fan Cooled
Output Current	25 Amps Surge, 22 Amps Continuous
Metering	Voltmeter and ammeter
Protection	Overvoltage and overload protection

Summary

Limited 12 Month Warranty

MFJ-4125 Instruction Manual

Installation

Instructions for setting up the MFJ-4125 power supply, including voltage selection.

Operation

Guidance on how to operate the MFJ-4125 power supply, including connecting loads.

Protection Features

Details on the unit's automatic shut-off and fuse replacement procedures.

Specifications and Features

Key technical specifications and features of the MFJ-4125 power supply.