Nexo NXAMP4X1, Руководство по обслуживанию

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NXAMP4x1
60
2. Inspection with ordinary mode
Condition:
• Ground each input terminal via a 600
Ω
resistor.
• Do not connect the load resistor to the output terminal.
2-1. Power ON sequence
1) Turn the power switch on. Confirm that the latest firmware version appears on the LCD and the four (4) MUTE LEDs light
up.
-- [v 1.00] --
(c) NEXO 2007.
2) Confirm that all the fans start rotation at low speed within 4 seconds after turning the power switch on.
3) Confirm that the following display appears on the LCD within 18
±
3 seconds after turning the power switch on. Also
confirm that the POWER LED and only one of the VOLUME LEDs for each channel light up.
2-2. Power consumption when idling
Measure the primary power consumption and confirm that the measured value is 70
±
20 W.
2-3. Output terminal DC voltage
Measure the DC voltage (Vdc) of each output terminal and confirm that the measured value is Vdc = 0
±
50 mV.
-20.0 -20.0 -20.0 -20.0 Vol(dB)
[MAIN ][MAIN ][SUB ][SUB ] < >
Example of firmware version 1.00
3. Inspection with attenuation test mode
Condition:
• Perform each test in this section in the attenuation test mode. (See page 56)
• Connect a 8
Ω
load resistor to each output terminal.
• Ground each input terminal via a 600
Ω
resistor.
3-1. Residual noise
Confirm that each output terminal’ s residual noise level is -65 dBu or less.
1-5. Other
0 dBu is defined as 0.775 Vrms in these inspections.