Bose FreeSpace Business E4 II Series Service Manual page 78

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.
Measure Reference
At Designator
Wallplate 1 J401A Pin 1
Wallplate 2 J401B Pin 1
Wallplate 3 J402A Pin 1
Wallplate 4 J402B Pin 1
4. Output Noise Test
4.1 With all inputs terminated with 600 Ohms and undriven, measure the following:
Connector
Zone1 Output
Zone2 Output
Zone3 Output
Zone4 Output
Music on Hold
Line Output
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.
Input Level
Line In 1A & 1B 1Vrms (0dBV)
Line In 1A & 1B 1Vrms (0dBV)
Line In 2A & 2B 1Vrms (0dBV)
Aux Mic/Line 3 1Vrms (0dBV)
Page/Mic/Line4 1Vrms (0dBV)
Page/Mic/Line4 1Vrms (0dBV)
TEST PROCEDURE
Value pins
open
5 VDC +/-5%
5 VDC +/-5%
5 VDC +/-5%
5 VDC +/-5%
Output Noise (20 Hz – 22 kHz)
SK1
SK2
SK3
SK4
J403
J401
Measure at
Zone 1 SPKR Output
Music On Hold/PBX Out
Zone 2 SPKR Output
Zone 3 SPKR Output
Zone 4 SPKR Output
Zone 4/Line Out
Value pins shorted
4.2 ~ 4.6 VDC +/-5%
4.2 ~ 4.6 VDC +/-5%
4.2 ~ 4.6 VDC +/-5%
4.2 ~ 4.6 VDC +/-5%
-70 dBV (316 uVrms)
-70 dBV (316 uVrms)
-70 dBV (316 uVrms)
-70 dBV (316 uVrms)
-80 dBV (282 uVrms)
-80 dBV (282 uVrms)
(± ± ± ± 1dB)
78
Gain THD+N
(20-20 kHz)
6 dB < 1%
0 dB < .1%
6 dB < 1%
6 dB < 1%
6 dB < 1%
0 dB < .2%