Marantz 250 - Page 15

Set the controls of the analyzer for
voltage measurement on the 3-volt scale.
Set the METER RANGE switch to the
O dB position.
Adjust the oscillator output level until
the amplifier output measures 2.45 volts.
Observe CHANNEL A meter. The meter
should indicate O dB. If the meter does
not indicate O dB, adjust potentiometer
R430 on the meter board for an O dB
indication.
Set the controls of the analyzer for volt-
age measurement on the 30-volt scale.
|
105 TO 125 VAC
50/60 Hz
Figure 4. AC Power Control Box Simplified Schematic
Ger]
GRD
Figure 5. Amplifier Output Load Box Simplified Schematic
10.
Set the CHANNEL A METER RANGE
to the +20 dB position.
Adjust the oscillator output level until
the amplifier output measures 24.5 volts.
Observe Channel A dB meter. The meter
should indicate O dB. If the meter does
not indicate O dB, adjust potentiometer
R424 for an O dB indication.
Perform steps 1-9 for Channel B. If cali-
bration is necessary, use potentiometer
R414 on the meter board in step 5, and
potentiometer R408 in step 8.
AC OUTLETS
AC WATTMETER AC VOLTMETER
O TO 150 WATTS 0 TO 150 VAC
(MOMENTARY
SWITCH)
AC AMMETER
0 TO 10 AMPERES