Marantz 3600 - Functional Tests; Maximum Voltage Output; Total Harmonic Distortion (THD); Hum and Noise

FUNCTIONAL TESTS
Perform functional tests on unit to establish
the operation of all inputs, outputs and con-
trols 4s specified. Reset Model 3600 controls
to their “Normal” positions upon comple-
tion of the functional test.
1.
For low level (Phono or Mic) input tests,
apply a 1 kHz, 10 mV audio signal to
Phono Input. Depress PHONO Selector
Pushswitch.
. Set Distortion Analyzer controls for AC
VTVM and monitor output at SCOPE or
TAPE OUTPUT Jack. Output should be
approximately 1.0 V rms.
. Without changing generator output level,
disconnect and reconnect to Mic Input.
Depress MIC Selector Pushswitch. Out-
put should remain at approximately 1.0
V rms.
. For high level (Tuner, Aux, or Tape) in-
puts, turn preamp power off, set genera-
tor to 1 kHz, 300 mV rms output.
Connect to TUNER Input. Reconnect
Distortion Analyzer to PREAMP Output.
. Turn preamp power on, set VOLUME to
maximum, depress TUNER Selector Push-
switch. Output should be approximately
3.0 V rms.
. Without changing any connections other
than inputs, check AUX, TAPE 1, and
TAPE 2 Inputs as described in Step 5.
Output level should remain at approxi-
mately 3.0 V rms.
MAXIMUM VOLTAGE OUTPUT
1.
Depress AUX Selector pushswitch. Con-
nect generator to AUX Input. Monitor
signal at PREAMP OUTPUT with oscillo-
scope and distortion analyzer controls set
for AC VTVM. Set VOLUME to MAX.
. Set generator frequency to 1 kHz and in-
crease generator output to the point of
just below clipping. VTVM should indi-
cate at least 9.0 V rms.
F.
TOTAL HARMONIC DISTORTION (THD)
1
With preamp VOLUME set to maximum,
check THD of AUX Input at 20 Hz,
2 kHz, and 20 kHz (3.0 V rms output).
THD should be less than 0.025. percent.
. Change input to PHONO and depress
PHONO Selector pushswitch. Adjust
generator for 3.0 Vrms at TAPE OUTPUT.
Check THD at 20 Hz, 2 kHz, and 20 kHz.
THD should be less than 0.025 percent.
HUM AND NOISE
1.
Insert 600-ohm phono shorting plug into
each PHONO and AUX INPUT jack.
Switch in bandpass filter control.
. Turn VOLUME control CW up to maxi-
mum and depress PHONO Selector push-
switch. Noise output should indicate less
than 78 microvolts ‘at TAPE OUTPUT.
. Depress AUX Selector pushswitch. Noise
output should indicate less than 30 micro-
volts at PREAMP OUTPUT.
FREQUENCY RESPONSE (PHONO/MIC)
Refer to Figure 6. RIAA Equalization Curve
and Standards to verify unit conformance.
1.
For Phono frequency response apply a
1 kHz signal to PHONO INPUT. Connect
AC VTVM to PREAMP OUTPUT. Set
generator output for O dB _ indication
on VTVM.
. Check output level at the following fre-
quencies + 0.5 dB:
QOUNZ fe Settadeie wate a - 19.30 dB
TOO AZ 2 sh iepcee sisted 4 Behe we + 13.11 dB
BOO AZ. seis Peie ee ae + 3.81 dB
QZ. asinte vee eb icee s whee - 2.61 dB
IO KAZ tisie eb eeteerd tas - 13.75 dB
QO KAZ i Atta Gees - 19.60 dB
. For Mic frequency response apply a 1 kHz
signal to MIC INPUT. Depress MIC Selec-
tor pushswitch. Set generator output to
O dB as measured at PREAMP OUTPUT.
. Reduce generator frequency to 30 Hz.
Output should be O dB (+ 0.75 dB).
. Increase generator frequency to 11.5 kHz.
Output should be O dB (+ O dB, — 4dB).
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