Bose 3-2-1 Service Manual

21
Preliminary




22. FM Stereo & Force Mono Threshold
22.1 Inject a 98.1MHz RF (83.0 MHz for
Japan) signal set to 1kHz stereo L=-R
modulation with 10% pilot modulation and
75 kHz total deviation at a level of 42 dBf
into J2000.
22.2 Enter the command TUSF09810
(TUSF08300 for Japan) into the computer.
This will tune the unit to the appropriate
frequency.
22.3 Enter the command TUSR. The unit will
then sample the FM S-meter level, and store
it in the EEPROM as the stereo level.
Enter the...

22
Preliminary




3. Power Up Test
3.1 Apply a short across BASS-EQ (J6 pin
6) and AGND (J6 pin 5). Apply 0 V to MUTE
(J6 pin 13).
3.2 Apply AC mains voltage to the bass
module.
3.3 Measure the transformer quiescent
primary current. It should be < 250 mArms.
3.4 Measure the V supply voltage at J6 pins
7, 8, 14 and 15. It should be +16.5 
+ 1.0
VDC. Remove the short applied in step 3.1.
3.5 Measure the J7 speaker output DC
potential on each pin of the connector rela-
tive to PGND at J6 pin 2...

23
Preliminary




7. Frequency Sweep Test
7.1 Apply a 350 mVrms, 10 Hz signal be-
tween BASS-EQ (J6 pin 6) and AGND
(J6 pin 5).
7.2 Sweep the input frequency from 10 Hz
to 500 Hz. Listen for any extraneous noises
such  as  buzzes,  rattles,  ticks,  port  noise  or
distortion.
  Satellite Array Procedures
Notes:
• Refer to Figure x for the following
   procedures.
• The satellite arrays are non-repairable.
   The grilles can be replaced using the
   disassembly/assembly procedures.
• Each...

24
Preliminary
MAIN PART LIST
Console Assembly (see Figure 5)
Item
NumberDescription Part
NumberQty. Note
1 LABEL, TOP COVER, GRAPHITE
LABEL, TOP COVER, PLAT WHT256946-001
256946-0021
2 COVER, CONSOLE, DVD, GRAPHITE
COVER, CONSOLE, DVD, PLAT WHT264482-001
264482-0021
3 STRAP, DVD, (CLAMP) 260462 1
4 SHIELD, FOIL, DVD, (ATAPI SHIELD) 260471-001 1
5 DRIVE, DVD ROM 256150-001 1
6 SCREW, M3 260463 2
7 CABLE, POWER, DVD, 155 MM 256955-155 1
8 CABLE, RIBBON, ATAPI, 40 POSITION 256954-090 1
9 HEATSINK, MAIN...

25
Preliminary
Figure 5. Console Exploded View
1
2
3
4
5
6
7
8
9
10 11
12
13
14
13
15
16
1718
19
20
21
22
24 25 26 27
28
29
4x 23
3x
5x2x
9x
2x 

26
Preliminary
MAIN PART LIST
Bass Module Assembly (see Figure 6)
1
6 PLACES
2 2 PLACES
3
4
5
6
7 8
9
1011 4 PLACES
4 PLACES 4 PLACES4 PLACES4 PLACES 2 PLACES
Figure 6. Bass Module Assembly Exploded View
Item
NumberDescription Part
NumberQty. Note
1 SCREW, TAPP, 8-11X.5, PAN, ASY, SQ 250817-08 6
2 GASKET, FOAM, .32”x12.0”x.125” 255202 2
3 BRACKET-L, COVER, AMP 255179 2
4 INSERT, BARBED, 10-32X20mm 145712-03 4
5 VIBRATION MNT, DBL STUD, 8/10-32 263002-006 4
6 NUT, HEX, 8-32, KEPS 118260-08 4
7...

27
Preliminary
MAIN PART LIST
Bass Module PCB Assembly (see Figure 7)
Figure 7. Bass Module PCB Assembly Exploded View
1
2
3
456
3 PLACES
3 PLACES
U1
BR1
Q1
Item
Numbe
r
Description Part
NumberQty. Note
1 HEATSINK, BASS MODULE 260093-001 1
2 CLIP, SPRING 142864 1
3 PAD, FOAM, .25”x.75”x.06” 255201 3
4 PC BOARD ASSY, BASS BOX , NO HEATSINK 254575-001 1 2
5 SCREW, M3.5X10MM, THD ROLL 140447-10 3
6 CLIP, HEAT SINK, BASS BOX AMP 255174 1 

28
Preliminary
ELECTRICAL  PART  LIST
Resistors Console Main PCB Assembly
Reference
DesignatorDescription Part Number Note
R1 33.2K, 0603, 1/10W, 1% 191465-3322
R2 33.2K, 0603, 1/10W, 1% 191465-3322
R3 6.04K, 0603, 1/10W, 1% 191465-6041
R4 9.09K, 0603, 1/10W, 1% 191465-9091
R5 10K, 0603, 1/10W, 1% 191465-1002
R6 19.1K, 0603, 1/10W, 1% 191465-1912
R11 22.1K, 0603, 1/10W, 1% 191465-2212
R12 9.53K, 0603, 1/10W, 1% 191465-9531
R14 1K, 0603, 1/10W, 1% 191465-1001
R15 10K, 0603, 1/10W, 1% 191465-1002
R27 51...

29
Preliminary
ELECTRICAL  PART  LIST
Resistors Console Main PCB Assembly
Reference
DesignatorDescription Part Number Note
R168 10K, 0603, 1/10W, 1% 191465-1002
R169 10K, 0603, 1/10W, 1% 191465-1002
R170 10K, 0603, 1/10W, 1% 191465-1002
R171 1K, 0603, 1/10W, 5% 199403-102
R172 1K, 0603, 1/10W, 5% 199403-102
R173 10.0K, 0805, 1/10W, 5% 133626-1035
R175 10.0K, 0805, 1/10W, 5% 133626-1035
R196 19.6K, 0603, 1/10W, 1% 191465-1962
R197 19.6K, 0603, 1/10W, 1% 191465-1962
R198 19.6K, 0603, 1/10W, 1% 191465-1962...

30
Preliminary
ELECTRICAL  PART  LIST
Resistors Console Main PCB Assembly
Reference
DesignatorDescription Part Number Note
R2004 1K, 0603, 1/10W, 5% 199403-102
R2005 120 OHMS, 0603, 1/10W, 5% 199403-121
R2006 499 OHMS, 0603, 1/10W, 1% 191465-4990
R2007 2.32K, 0603, 1/10W, 1% 191465-2321
R2008 2.32K, 0603, 1/10W, 1% 191465-2321
R2009 330 OHMS, 0603, 1/10W, 1% 191465-3300
R2010 150 OHMS, 0603, 1/10W, 5% 199403-151
R2011 100 OHMS, 0603, 1/10W, 1% 191465-1000
R2012 4.75K, 0603, 1/10W, 1% 191465-4751
R2013 51...