Marantz SR-53 - Idling Current Adjustment; Voltage Conversion

5. IDLING CURRENT ADJUSTMENT 7. HOW TO CHANGE THE SUPPLY VOLTAGE
(/02/05/07 Versions)
(1)
Before
switching
the
power
ON,
set
the
Master
Volume
;
control
to the minimum
position and
the
Balance
and
Refer to the
following
diagram
for
the
voltage
change
pro-
Tone
controls to
the
center
positions.
Then, rotate
the
cedure.
semi-fixed
resistors
R719
(L CH)
and
R720
(R
CH)
on
the
PC board
PV04
fully clockwise.
(2) Connect a digital voltmeter, set for the DC voltage input
to the pertinent test points (the marked ones of R737-
R738) on the PC board PVO4. (Positive: Rear side,
Negative: Front side)
(3) After the completion of the above setup.
Switch the power ON and adjust the semi-fixed resistors
R719 (L CH) and R720 (R CH) on the PC board PV04
according to the reading of the digital voltmeter. The
setting values are 6 ~ 7.6 mV (16.7 ~ 20 mA) of the
both channels.
Please refer to the table below.
Power ON
4mV
Ft min tater [4m
Measurement point
a R737/R738
6. VOLTAGE CONVERSION
®@ /01 Version ONLY
To convert the unit to a different power source voltage,
change the position as illustrated in the drawing below.
VOLTAGE SELECTOR
Vv
x
240vV~ l20V~
220V~ ap 110V~
CAUTION
DISCONNECT POWER SUPPLY CORD FROM AC
OUTLET BEFORE CONVERTING VOLTAGE.
be PCS 71 239