Bose FreeSpace Business E4 II Series Service Manual page 79

6. Verify Sequence Output Test
This test checks the Sequence DC voltage level on the Zone 4 Line Out jack. This voltage is
used to turn on remote amplifiers such as the Bose
6.1 Ensure that the unit in STANDBY with AC mains power applied and that the Power ON/OFF
switch on the rear panel is in the ON position. Using a DMM, measure the DC voltage level at
the Zone 4 Line Out jack from pin 4 (+12V) to pin 3 (GND). Verify that it is 0 VDC.
6.2 Press the STANDBY button on the front panel. Ensure that the amplifier powers up and that
the SYSTEM STATUS LED lights green. Using a DMM, measure the DC voltage level at the
Zone 4 Line Out jack from pin 4 (+12V) to pin 3 (GND). Verify that the DC voltage level is now
12 VDC+/-5%.
Measure at
Zone 4 Line Out (J401 PIN 4)
Zone 4 Line Out (J401 PIN 4)
7. Override (Direct input) Test
7.1 Apply a 1 kHz, 1 Vrms (0dBV) input to the Direct In/Control jack at pins 1 and 2 (J503). Hold
J503 Pin 4 open and verify that no signal is present at the Zone 1 (SK1), Zone 2 (SK2), Zone 3
(SK3), and Zone 4 (SK4) speaker output jacks. Reference a dB meter to the input. Short J503
Pin 4 to J503 Pin 3, and verify the following:
Measure at Ref Des
Zone 1 SK1
Zone 2 SK2
Zone 3 SK3
Zone 4 SK4
8. Contact Closure Input Test
This test checks the remote standby functionality of the E4 Series II amplifier.
8.1 With the unit in operate mode, short pins 1 and 2 of J402 together (Remote ON/OFF jack).
The unit should turn off.
8.2 Remove the short. Verify that the unit returns to standby mode.
(i.e., standby LED is lit amber).
TEST PROCEDURE
Voltage Level
0 VDC
12 VDC +/-5%
Gain THD+N (20-30 kHz)
(± ± ± ± 1dB)
30 dB
30 dB
30 dB
30 dB
79
® Model 1600/1800VI amplifiers.
< 1%
< 1%
< 1%
< 1%