Marantz 1060 - Distortion and Channel Separation Tests; Harmonic Distortion Measurement; Channel Separation Testing; AC Voltage Conversion

5. Measure the total harmonic distortion with the analyzer and verify it is less than 0.5%.
NOTE: Any parasitic oscillation in the amplifier with be displayed on the oscilloscope
when capacitance is switched into the load.
6. Switch the distortion analyzer back to SET LEVEL MANUAL.
(Do not adjust sensitivity of analyzer.)
7. Change the frequency of the audio oscillator and distortion analyzer to 1 KHz. Adjust
audio oscillator output as necessary to have a full scale reading on the 0-1 scale on the
analyzer.
8. Measure the distortion, verifying it is no greater than 0.5%.
9. Repeat steps 7 and 8, changing frequency to 20 Hz.
Distortion should be no more than 0.5%.
10. Check for parasiticoscillations; there should be none.
. Channel Separation
1. Set audio oscillator to 20 KHz. Connect oscillator to chennel L AUX input only, with
shorting
plug
(10K
ohm)
in
channel
R
AUX
input.
Connect
distortion
analyzer
to
SPEAKER output terminals channel L.
Adjust oscillator output until distortion analyzer indicates O dB.
Measure channel R output. Distortion analyzer should indicate —30 dB or greater.
If indication is less than —30 dB, adjust input wires to preamp board until reading is
—30 dB or greater.
=O
VOLTAGE CONVERSION
This model is equipped with a universal power transformer to permit operation at 100, 120,
200, 220 and 240V AC 50 to 60Hz.
To convert the Model 1060 to the required voltage perform the following steps:
Remove the top cover.
Remove the Transformer Wire Connection Terminal Cover, loosen two Cover mounting
screws on the rear panel, see Fig.3 . '
Change the jumper wires as illustrated in Fig. 4 for the required AC voltage and replace the
fuse as instructed.
CAUTION: DISCONNECT POWER SUPPLY CORD FROM AC OUTLET BEFORE CONVERT-
ING VOLTAGE.
REMOVE SCREW
REMOVE THIS COVER
Figure 3. Remove the Terminal Cover