- - [ v 1 . 0 0 ] - -
( c ) N E X O 2 0 0 7 .
- 2 0 . 0 - 2 0 . 0 - 2 0 . 0 - 2 0 . 0 V o l ( d B )
[ M A I N ] [ M A I N ] [ S U B ] [ S U B ] < >
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 120 ±30 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.
2-4. PEAK
indicator
Set this unit to GAIN: 0 dB, VOL: 0 dB.
Input the 20 kHz, 15.7 dBu, sine wave to channel 1 input terminal, and confirm that the PEAK indicator of channel 1 flashes
or lights. Input the 20 kHz, 13.2 dBu, sine wave, and confirm that the PEAK indicator of channel 1goes off.
Perform the same test for channel 2-4 in the same manner.
After test, set this unit to GAIN: 0dB, VOL: -90 dB.
3.
Inspection with attenuation test mode
Condition:
•
Perform each test in this section in the attenuation test mode. (See “TEST PROGRAM 4-14. ATTENUATION test”)
•
Connect an 8 Ω load resistor to each output terminal.
•
Ground each input terminal via a 600 Ω resistor.
3-1. Residual
noise
Measure the residual noise level at each output terminal and confirm that measured value is -65 dBu or less.
Note:
Measure the noise level with the 22 Hz - 22 kHz band pass filter specified at 1-3.
4.
Inspection with analog test mode
Condition:
• Perform each test item in this section with the analog test mode of the test program. (See “TEST PROGRAM 4-15.
ANALOG test”)
•
Unless otherwise specified, perform the test with an 8 Ω resistor connected to each output terminal.
Example of firmware version 1.00
1-5. Other
0 dBu is defined as 0.775 Vrms in these inspections.
2.
Inspection with ordinary mode
Condition:
•
Ground each input terminal via a 600 Ω resistance.
•
Do not connect the load resistance 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 display.
NXAMP4x4
79
Содержание NXAMP 4X4
Страница 48: ...B B NXAMP4x4 48 CONTROL Circuit Board Pattern side パターン側 2NA WR77020 10 0 ...
Страница 49: ...B B NXAMP4x4 49 CONTROL Circuit Board Pattern side パターン側 2NA WR77020 10 0 ...
Страница 51: ...NXAMP4x4 51 OUTANH Circuit Board Pattern side パターン側 2NA WJ97320 10 0 ...
Страница 54: ...B B NXAMP4x4 54 PN AN Circuit Board Pattern side パターン側 2NA WJ97170 10 2 ...
Страница 55: ...B B NXAMP4x4 55 PN AN Circuit Board Pattern side パターン側 2NA WJ97170 10 2 ...
Страница 59: ...B A NXAMP4x4 59 PSANHA PSANHB Circuit Board Reduction 7 10 Component side 部品側 2NA WJ97350 70 3 ...
Страница 60: ...B B NXAMP4x4 60 PSANHA PSANHB Circuit Board Reduction 7 10 Pattern side パターン側 2NA WJ97350 70 3 ...
Страница 63: ...Expansion slot NXAMP4x4 63 NX DFLT Circuit Board Pattern side パターン側 Component side 部品側 2NA WT66120 10 0 ...