Bose FREESPACE 4400, Руководство по обслуживанию

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3.2 Short the eight pins of the connector together and measure the DC voltage. Verify that it is
in accordance with the table below.
4. Output Noise Test
4.1 With all inputs terminated with 600 Ohms and undriven, measure the following:
5. Output Gain and THD Test
5.1 Apply a 1kHz, 1Vrms (0dBV) signal into the Line In 1A & B input. Reference a dB meter to
the input signal. Measure the gain and distortion at the Zone 1 SPKR Output as shown in the
table below. Sweep the input frequency from 20Hz to 20kHz while monitoring the gain level to
verify that it remains in tolerance across the band.
5.2 Repeat step 5.1 for the inputs listed below.
TEST PROCEDURE
Measure
At Reference
Designator Value pins
open Value pins shorted
Wallplate 1 J401A Pin 1 5 VDC +/-5% 4.2 ~ 4.6 VDC +/-5%
Wallplate 2 J401B Pin 1 5 VDC +/-5% 4.2 ~ 4.6 VDC +/-5%
Wallplate 3 J402A Pin 1 5 VDC +/-5% 4.2 ~ 4.6 VDC +/-5%
Wallplate 4 J402B Pin 1 5 VDC +/-5% 4.2 ~ 4.6 VDC +/-5%
Input Level Measure at Gain
(
±±±±
1dB)
THD+N
(20-20 kHz)
Line In 1A & 1B 1Vrms (0dBV) Zone 1 SPKR Output 6 dB < 1%
Line In 1A & 1B 1Vrms (0dBV) Music On Hold/PBX Out 0 dB < .1%
Line In 2A & 2B 1Vrms (0dBV) Zone 2 SPKR Output 6 dB < 1%
Aux Mic/Line 3 1Vrms (0dBV) Zone 3 SPKR Output 6 dB < 1%
Page/Mic/Line4 1Vrms (0dBV) Zone 4 SPKR Output 6 dB < 1%
Page/Mic/Line4 1Vrms (0dBV) Zone 4/Line Out 0 dB < .2%
Connector Output Noise (20 Hz – 22 kHz)
Zone1 Output SK1 -70 dBV (316 uVrms)
Zone2 Output SK2 -70 dBV (316 uVrms)
Zone3 Output SK3 -70 dBV (316 uVrms)
Zone4 Output SK4 -70 dBV (316 uVrms)
Music on Hold J403 -80 dBV (282 uVrms)
Line Output J401 -80 dBV (282 uVrms)