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Also check that the [CLIP] indicator is lit at this time.
This test should be completed within 30 seconds of
starting.
(13) [SIGNAL] Indicator Test
Check that the [SIGNAL] indicator lights when a sine
wave of 1kHz at -23dBu is applied to the input.
2. Inspection in BRIDGE mode
<Preparation>
Input attenuation:
0 (maximum)
Input terminal:
q [INPUT CHANNEL A]
w [INPUT CHANNEL C]
e [INPUT CHANNEL E]
(XM6150 only)
Cannon connector (Pin 2 HOT, pins
1 and 3 GROUND)
[BRIDGE] switches: All ON
[HPF] switch:
OFF
Output terminal:
q [SPEAKERS CHANNEL A+B]
w [SPEAKERS CHANNEL C+D]
e [SPEAKERS CHANNEL E+F]
4 Ω +4 Ω non-induction resistance
Load resistance:
power capacity 500W or higher
Measuring apparatus
connection: Floating ground, with load resistance
connected in between.
<Inspection>
(1) Gain Test
(2) Frequency Response Test
(3) Total High Harmonic Distortion Test
3. Settings after inspection is complete
(XM6150 only)
Turn the input attenuator all the way counterclockwise. Turn
off the [HPF] and [BRIDGE] switches. Set the input select
switch to EACH CH.
4. Other
0dBu=0.775V
When measuring the noise level, use an audio filter.
Check that the following output voltage is obtained
when a 1kHz, -10.0dBu sine wave is applied to the
input terminal.
+22.1 ± 1.0dBu
XM6150:
+23.6 ± 1.0dBu
XM4220:
Check that the response is within 0.0 ± 0.5dB at 20Hz
and within -0.5 ± 0.5dB at 20kHz using 1kHz as a reference
when sine waves at frequencies of 20Hz, 1kHz and 20kHz
at -10dBu are input to the input terminal.
Check that the total harmonic distortion (THD) is 0.2%
or less at the following rated outputs when a high-quality
sine wave of 1kHz is applied to the input terminal.
XM6150: 30.0dBu
XM4220: 31.7dBu
This test should be completed within 30 seconds of
starting.
XM6150/XM4220
25
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