Bose 802 E Service Manual

11
DISASSEMBLY/ASSEMBLY  PROCEDURES
402® and 802® 

 Second Variation
1. Top Cover Removal
1.1 Remove the 5 screws (1) that secure
the top cover (2) to the chassis.
1.2 Lift off the top cover .
2. Top Cover Replacement
2.1 Place the top cover (2) onto the chassis.
2.2 Secure the top cover to the chassis
using the 5 screws (1) that were remove in
procedure 1.1.
NOTE: The front panel is not removable.
3. PCB Removal
3.1 Perform procedure 1.
3.2 Disconnect the two power transformer
connectors and the two...

12
TEST SETUP PROCEDURE
The controls on the back panel should be set as follows (unless otherwise specified):
1. Set the input switches to the -10 dB position.
2. Set the Mode switch to the number 2 (BA) position.
3. Set the Low Frequency Level control to the +3 dB position.
4. Set the Output Mode switch to the NORM position
input
switch
Input connections: connect pin 1 (-) and pin 3 (shield) together at the signal generator and
audio analyzer (oscilloscope and dB meter).
Input and Output connection...

13
402® TEST PROCEDURES
1. High Frequency Gain Test
1.1 Apply a 100 mVrms, 850 Hz signal to
the controller’s input terminals.
1.2 Reference a dB meter to the input of the
controller.
1.3 Measure the gain at the high frequency
output terminals. The gain should be +9.8
 
+ 1.0 dB.
1.4 Change the input switches to +4 dB.
1.5 The gain should be -3.4 
+ 1.0 dB.
2. Low Frequency Gain Test
Note: Set the input switches to the -10 dB
position.
2.1 Apply a 100 mVrms, 80 Hz signal to the
controller’s input...

14
402® TEST PROCEDURES
402 Series 

 Frequency Response Table
Bi-Amp Mode Full Range Output
Frequency Output Tolerance
60 Hz -13.0 dB
±1.5 dB
90 Hz -5.6 dB
±1.5 dB
220 Hz +6.8 dB
±1.5 dB
600 Hz -2.4 dB
±1.5 dB
850 Hz 0.0 dB reference
4 kHz +5.8 dB
±1.5 dB
13.5 kHz +15.5 dB
±1.5 dB
5. Low Frequency Response Bi-Amp Mode
5.1 Apply a 100mVrms, 80 Hz signal to the
controller’s input terminals.
5.2 Reference a dB meter to the input.
5.3 Measure the output at the low fre-
quency output terminals. Refer to the...

15
402® TEST PROCEDURES
9. Midrange Frequency Distortion Test
Bi-Amp Mode
9.1 Apply a 7.5 Vrms, 850 Hz signal to the
controller’s input terminals.
9.2 Measure the distortion at the high
frequency output terminals. The measure-
ment should be 
< .1%.
10. High Frequency Distortion Test Bi-Amp
Mode
10.1 Apply a 2.25 Vrms, 6 kHz signal to the
controller’s input terminals.
10.2 Measure the distortion at the high
frequency output terminals. The measure-
ment should be 
< .2%.
11. Clipping Headroom Test
11.1...

16
802® TEST PROCEDURES
1. High Frequency Gain Test
1.1 Apply a 100 mVrms, 700 Hz signal to
the controller’s input terminals.
1.2 Reference a dB meter to the input of the
controller.
1.3 Measure the gain at the high frequency
output terminals. The gain should be +15.1
+ 1.0 dB.
1.4 Change the input switches to +4 dB.
1.5 The gain should be 2.0 
+ 1.0 dB.
2. Low Frequency Gain Test
Note: Set the input switches to the -10 dB
position.
2.1 Apply a 100 mVrms, 80 Hz signal to the
controller’s input...

17
802® TEST PROCEDURES
802 Series 

 Frequency Response Table
Bi-Amp Mode Full Range Output
Frequency Output Tolerance
40 Hz -21.0 dB
±1.5 dB
60 Hz -11.5 dB
±1.5 dB
700 Hz 0.0 dB reference
2.5 kHz +2.1 dB
±1.5 dB
6 kHz +9.6 dB
±1.5 dB
15 kHz +16.7 dB
±1.5 dB
802 Series 


 Frequency Response Table
Bi-Amp Mode Full Range Output
5. Low Frequency Response Bi-Amp Mode
5.1 Apply a 100mVrms, 80 Hz signal to the
controller’s input terminals.
5.2 Reference a dB meter to the input.
5.3 Measure the output at the...

18
11. Clipping Headroom Test
11.1 Apply a 5.8 Vrms, 700 Hz signal to the
controller’s input terminals.
11.2 Measure the distortion (at an output of
7.35 
+ .5 Vrms) at the high frequency
output terminals. The measurement should
be 
< .1%.
12. Channel Separation Test Bi-Amp Mode
12.1 Apply a 4.0 Vrms, 700 Hz signal to the
controller’s input terminals.
12.2 Measure the channel separation
across the high frequency output terminals.
It should be 
> 40 dB.
13. Hum
13.1 Measure the hum and noise at the low...

19
PART LIST NOTES
1. This part is not normally available from customer service. Approval from the Field Service
Manager is required before ordering.
2. The individual parts located on the PCBs are listed in the Electrical Part List.
3.         This part is critical for safety purposes. Failure to use a substitute replacement with the
same safety characteristics as the recommended replacement part might create shock, fire
and/or other hazards.
4. This part is not shown. 

20
12
11
1
2
6X 2x
3
(5x)
3
4
5
6
7 8
9 10
2x
7x
6
2
(6x)
(2x)
8
(2x)
7
3
511
(2x)1
4
9 10
1213
3
(6x)14
(2x)
15
Figure 2. 402®, 802® 

 Original
 Version Exploded View
Figure 3. 402, 802 

 Current Version
Exploded View
16