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Marantz PM-50 - Idling Current Adjustment; Supply Voltage Change Procedure

Marantz PM-50
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5.
IDLING
CURRENT
ADJUSTMENT
(1)
Before
switching
the
power
ON,
set
the
Master
Volume
~
control
to
the
minimum
position
and
the
Balance
and
Tone
controls
to
the
center
positions.
Also
set
semi-fixed
resistors
R719
(L_
CH)
and
R720
(L
CH)
on
PCB
P701
to
the
center
positions.
Each
of
the
cement
resistors
R743
(L
CH)
and
R744
(R
CH)
on
the
PCB
P7011
is
provided
with
three
test
points.
Connect
a
digital
voltmeter,
set
for
the
DC
voltage
input,
to
the
test
points
at
the
two
extremities
of
the
three
test
points
of
R743
or
R744.
After
the
setup
above,
switch
the
power
ON
and
adjust
semi-fixed
resistor
R719
(L
CH)
or
R720
(R
CH)
on
PCB
P701
according
to
the
digital
voltmeter
reading.
The
target
setting
value
is
14
mV
(38.9
mA)
for
both
the
L
CH
and
R
CH.
(2)
(3)
Please
refer
to
the
table
below.
Idling
current
setting
value
14
mV
14.5
mV
14
mv
Note
on
Safety:
Symbol
A
Fire
or
electrical
shock
hazard.
Only
original
parts
should
be
used
to
replace
any
part
marked
with
Elapsed
time
after
power
ON
30
sec.
—
1
min.
1
min,
~
2
min.
2
min.
—
4
min.
More
than
4
min.
symbol
A
.
Any
other
component
substitution
(other
than
original
type),
may
increase
risk
of
fire
or
electrical
shock
hazard.
14
‘6.
HOW
TO
CHANGE
THE
SUPPLY
VOLTAGE
(A/N/T/W
Versions)
With
the
PM-50
A
and
T
Versions,
the
rated
supply
voitage
of
240V
can
he
changed
to
220V.
In
the
same
way,
the
220V
rated
supply
voltage
of
the
PM-50
N
and
W
Versions
can
be
changed
to
240V.
Refer
to
the
following
diagram
for
the
voltage
change
pro-
cedure.
953
952
AC
CORD
woot
Goow
g
Soldered
surface
of
P951
After
binding
solder
around
the
terminal,
bundle
the
brown
wire
and
blue
wire
together
and
tighten
them
with
a
tightener.
@
Note
on
Terminals
J951
and
J956
Wrapping
terminals
J951
and
J956
on
the
P951
PC
board
are
critical
components
for
the
safety.
Please
observe
the
follow-
ing
caution
when
working
these
terminals.
=
fie
Wrapping
shall
be
performed
within
range
A
.
When
binding
up
solder,
apply
solder
within
range
B
.
MZ
2298

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