Bose 802 C II User manual

1
©1997 Bose Corporation Part Number 129292 REV 03
Service Manual
802C System Controller
Original and SMD Version
®
®
Units with serial numbers beginning with 100000 are the original 802C's.
Units with serial numbers beginning with 200000 are the new SMD 802C's.

2
Contents
Safety Information............................................................................................................................ 3
Electrostatic Discharge Sensitive (ESDS) Device Handling ........................................................ 4
Specifications................................................................................................................................... 5
Technical Description ...................................................................................................................... 6
Disassembly/Assembly Procedures .............................................................................................. 7
Figure 1. Locking Tab Screw Location ............................................................................................. 7
Figure 2. Original 802C PCB Exploded View................................................................................... 8
Figure 3. SMD 802C PCB Exploded View ....................................................................................... 8
Test Procedures .......................................................................................................................... 9-10
Part List Notes................................................................................................................................ 11
Main Part List.................................................................................................................................. 12
Figure 4. Main Parts Exploded View ..............................................................................................13
Electrical Part List..................................................................................................................... 14-17
Voltage Conversion Instructions .................................................................................................. 18
Figure 5. Voltage Conversion Diagram .......................................................................................... 18
Figure 6. Top Cover Connection Diagram...................................................................................... 19

3
SAFETY INFORMATION
1. Parts that have special safety characteristics are identified by the symbol on
schematics or by special notes on the parts list. Use only replacement parts that
have critical characteristics recommended by the manufacturer.
2. Make leakage current or resistance measurements to determine that exposed
parts are acceptably insulated from the supply circuit before returning the unit
to the customer. Use the following checks to perform these measurements:
A. Leakage Current Hot Check-With the unit completely reassembled, plug
the AC line cord directly into a 120VAC outlet. (Do not use an isolation
transformer during this test.) Use a leakage current tester or a metering
system that complies with American National Standards Institute (ANSI)
C101.1 “Leakage Current for Appliances” and Underwriters Laboratories
(UL) 1492 (71). With the unit AC switch first in the ON position, then in the
OFF position, measure from a known earth ground (metal water pipe,
conduit, etc.) to all exposed metal parts of the unit (antennas, handle bracket,
metal cabinet, screwheads, metallic overlays, control shafts, etc.), especially
any exposed metal parts that offer an electrical return path to the chassis.
Any current measured must not exceed 0.5 milliamp. Reverse the unit power
cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN
THE LIMITS SPECIFIED HEREIN INDICATE APOTENTIAL SHOCK HAZ-
ARD THAT MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO
THE CUSTOMER.
B. Insulation Resistance Test Cold Check-(1) Unplug the power supply and
connect a jumper wire between the two prongs of the plug. (2) Turn on the
power switch of the unit. (3) Measure the resistance with an ohmmeter be-
tween the jumpered AC plug and each exposed metallic cabinet part on the
unit. When the exposed metallic part has a return path to the chassis, the
reading should be between 1 and 5.2 Megohms. When there is no return path
to the chassis, the reading must be “infinite”. If it is not within the limits specified,
there is the possibility of a shock hazard, and the unit must be repaired and re-
checked before it is returned to the customer.
PROPRIETARY INFORMATION
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF
BOSE®CORPORATION WHICH IS BEING FURNISHED ONLY FOR
THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT
BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE
BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED
FOR ANY OTHER PURPOSE.

4
DEVICE HANDLING
ELECTROSTATIC DISCHARGE SENSITIVE (ESDS)
This unit contains ESDS devices. We recommend the following precautions when repairing,
replacing or transporting ESDS devices:
• Perform work at an electrically grounded work station.
• Wear wrist straps that connect to the station or heel straps that connect to conductive floor
mats.
• Avoid touching the leads or contacts of ESDS devices or PC boards even if properly
grounded. Handle boards by the edges only.
• Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert unpro-
tected devices into materials such as plastic, polystyrene foam, clear plastic bags, bubble wrap
or plastic trays.
CAUTION: THE 802®C SYSTEM CONTROLLER CONTAINS NO USER-SERVICEABLE
PARTS. TO PREVENT WARRANTY INFRACTIONS, REFER SERVICING TO WARRANTY
SERVICE STATIONS OR FACTORY SERVICE.

5
SPECIFICATIONS
Input
C
onnections:
(per channel)
O
ne
(
1
)
balanced female XLR connector
One (1) unbalanced 1/4" phone jack
Output Connections:
(per channel) Two (2) 1/4" phone jacks per channel (outputs used depend upon mode selected)
Input Impedance: Balanced input, 4kΩ
Unbalanced input, 42kΩ
Electronic Crossover
Frequency: 180Hz (bi-amplified mode only)
Maximum Output Level: 4 Volts (+12dB into 600Ω, 50Hz-16kHz)
Total Harmonic Distortion: Less than .02% at 1 Volt (0dB)
Less than .2% at 8 Volts (18dB)
Output Noise: Less than 20uV (-9dBV) A-weighted
Power Requirements: 120 Vac, 50-60Hz, 3.5 Watts
220 Vac, 50-60Hz, (European)
100 Vac, 50-60Hz, (Japan)
Dimensions: 1 3/4"H x 10" W x 5" D
(4.4 x 25.4 x 12.7 cm)
Weight: 1.97 lbs (.895 kg)

6
The 802®C System Controller is a sophisticated signal processing device which combines the
functions of three equalizers, an automatic switching circuit, and an electronic crossover. The
802C system controller automatically selects the proper crossover function and equalization
curve for a given system application through use of a switching network operating in conjunc-
tion with the unit's output jacks. In addition to signal routing based on equalization require-
ments, the switching network indicates mode of operation on its front panel. The front panel
also includes high-cut and low-cut switches which decrease line output by 4dB at 55Hz and by
10dB at 16kHz. Sharp subsonic and ultrasonic band-limiting filters reduce power waste, stage
noise, high-frequency instability, and interference. The 802C system controller retains the
compact dimensions of its predecessor, the Bose®802E active equalizer, and fits into one
space of a standard 19" equipment rack with the optional RMK-8 Rack Mount Kit.
In an on-going process of manufacturing updates, as technology permits, Bose Corporation
has begun using SMD (surface mount devices) components on its 802C controller. The new
SMD components are such a space saving feature that this new version permits us to elimi-
nate the "piggy-back" PCB and place all electronics on one single printed circuit board. This
manual will identify the different procedures, PCB layouts, and components where necessary.
There is no difference in the operation or function between the original 802C and the
802C SMD units.
TECHNICAL DESCRIPTION

7
DISASSEMBLY/ASSEMBLY PROCEDURES
Figure 1. Locking Tab Screw Location
Note: Refer to the Figures (2 and 3) for the
following procedures.
1. Top Cover Removal
1.1 Remove the four screws (two located
at the rear of the unit and one located on
each side of the unit) that secure the top
cover to the chassis.
1.2 Lift the rear of the top cover slightly
and slide it forward until the front of the top
cover is clear of the switches.
2. Top Cover Replacement
2.1 Align the front of the top cover with the
switches and LED's and slide the cover into
place.
2.2 Secure the top cover into place.
3. 302EQ ("piggy-back") PCB Removal
Note: The original 802C has two PCB's.
The following procedure will discuss the
removal of the "piggy-back" PCB.
Note: The "piggy-back" PCB does not
need to be removed when removing the
main PCB.
3.1 Perform procedure 1.
3.2 Locate the four plastic stand-offs (three
are located in the corners of the PCB and
one is located between C125 and C225).
3.3 With small needle-nose pliers, squeeze
the retaining tab of each stand-off while
gently lifting up on the PCB to release the
lock. Grasp the PCB at the middle of each
side and lift the PCB off of the connectors.
5.5 Lift the front of the PCB up slightly.
Gently pull the PCB out while pushing on
the center of the XLR jacks.
6. Main PCB Replacement
6.1 Carefully slide the PCB into the chas-
sis while aligning the XLR jacks into their
housing.
6.2 Lock the XLR jacks into place by
inserting a small screwdriver into the small
hole in the XLR jack and rotate the screw
clockwise 1/8 turn.
6.3 Replace the 5 screws that hold the
PCB into place in the chassis.
6.4 Perform procedure 2.
4.2 Perform procedure 2.
5. Main PCB Removal
5.1 Perform procedure 1.
5.2 Remove the 6 knurled nuts securing
the input and output jacks to the chassis.
5.3 Remove the 5 screws that secure the
main PCB to the chassis.
5.4 On the rear of the unit, at the XLR
jacks there is a small hole with a locking
screw inside (see Figure 1). Insert a small
flathead screwdriver into the hole and
rotate the locking screw 1/8 turn counter-
clockwise to release the locking tab.
4. 302EQ ("piggy-back") PCB Replace-
ment
4.1 Replace the "piggy-back" PCB (on the
original 802C controller) by placing the
board over the connectors and pushing the
board down onto the stand-offs.

Figure 2. Original 802C PCB Exploded View
Figure 3. SMD 802C PCB Exploded View
8

9
TEST PROCEDURES
4. Bi-Amp Frequency Response
Note: This test is performed with both the
802 AMP and the 302 AMP output jacks
used at the same time.
4.1 Apply a 750Hz, 500mVrms signal to
the input of the 802C.
4.2 Reference a dB meter to the 802AMP
output jacks (while in the Bi-Amp mode).
4.3 Refer to the frequency response table
below and verify the response of the unit.
3. 302 Passive Frequency Response
3.1 Apply a 750Hz, 500mVrms signal to
the input of the 802C.
3.2 Reference a dB meter to the 302AMP
output jacks.
3.3 Refer to the frequency response table
below and verify the response of the unit.
2. 802 Full Range Frequency Response
2.1 Apply a 750Hz, 500mVrms signal to
the input of the 802C.
2.2 Reference a dB meter to the 802AMP
output jacks.
2.3 Refer to the frequency response table
below and verify the response of the unit.
Output
Jacks
Inserted
802
Full
Range
Passive
2-Way Bi- AMP
No Jacks
Inserted On Off Off
Inserted into
802 AMP On Off Off
Inserted into
302 AMP Off On Off
Inserted into
802 and 302
AMP
Off Off On
1. Mode Indicator Test
1.1 Depending on the output jack configu-
ration (see top cover diagram on page 17),
equalization curves and output vary. You
must test all modes of the 802C to assure
proper operation.
1.2 Perform the test below to verify that the
mode select operation is working properly.
Note: You can insert one or both of the
Full Range Frequence Response Table
Frequency Output Tolerance
55Hz +14.0dB ±1.5dB
30Hz 0dB ±2.5dB
250Hz +2.7dB ±1.2dB
750Hz 0dB
(reference) -
3kHz +2.3dB ±1.5dB
7.5kHz +12.0dB ±1.5dB
15kHz +16.9dB ±1.8dB
Frequency Output Tolerance
55Hz -20.1dB ±2.5dB
230Hz +2.6dB ±1.8dB
750Hz 0 dB
(reference) -
15kHz +17.0dB ±1.8dB
Frequency Output Tolerance
30Hz -8.8dB ±2.5dB
55Hz +6.2dB ±1.5dB
150Hz -3.2dB ±1.5dB
250Hz +3.2dB ±1.8dB
750Hz 0 dB
(reference) -
3kHz 0.9dB ±1.5dB
15kHz +15.3dB ±1.8dB
Passive Frequency Response Table
Frequency Output Tolerance
55Hz +9.3dB ±1.8dB
750Hz 0dB
(reference) -
15kHz +6.9dB ±2.0dB
Lo and Hi Cut Switch Response Table
Note: Set both the Lo and Hi cut switches
IN for the following response table.
802 Bi-Amp Frequency Response Table
output jacks into the unit for this test.
LED Indicator Status

10
TEST PROCEDURES
4.4 Apply a 100Hz, 500mVrms signal to
the input of the 802C.
4.5 Reference a dB meter to the 302AMP
output jacks (while in the Bi-Amp mode).
4.6 Refer to the frequency response table
below and verify the response of the unit.
6. Noise Test
6.1 All noise measurements areANSI
A-weighted true rms, with the inputs
shorted.
6.2 Refer to the table below for the proper
noise levels.
5. Distortion Test
Note: Total harmonic distortion must be
measured in all modes to assure proper
operation.
5.1 Apply a 750Hz, 5Vrms signal to the
input of the 802C.
5.2 Refer to the table below for the distor-
tion specification for the corresponding
mode being tested.
Note: For the Bi-Amp 302 reading the
input signal should be a 100Hz, 5Vrms
signal.
Frequency Output Tolerance
55Hz +3.7dB ±1.5dB
100Hz 0dB
(reference) -
230Hz -8.3dB ±1.5dB
750Hz -25.8dB ±2.5dB
302 Bi-Amp Frequency Response Table
Output Frequency. Distortion
802 Full
Range 750Hz <0.1%
302 Passive 750Hz <0.1%
802 Bi-Amp 750Hz <0.1%
302 Bi-Amp 100Hz <0.1%
Distortion Table
Noise Table
Output Noise
802 Full
Range <20uV
302 Passive <20uV
802 Bi-Amp <20uV
302 Bi-Amp <10uV

11
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 PCB 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. RC-4156 is to be used ONLY as a replacement for U5 and U6. This replaces the selected
LS-404 IC previously used in these locations. Due to the higher current needs of the RC-4156,
DAMAGE could occur to the power supply if this IC is used in other locations on the PCB.
5. This part is used on the 220V variation only.
PART LIST NOTES

12
MAIN PART LIST
Reference
Designator Description Part Number Note
J1, 3 CONNECTOR, XLR,
INSERT 121823
J2, 4-8 JACK, PHONE 121570
J9 WAFER, 7PIN, (2461) 123237-07
J9 CONNECTOR, 7PIN
(21458) 121970-07
J10 WAFER, 6PIN (2461) 123237-06
J10 CONNECTOR, 6PIN
(21458) 121970-06
P1, 2 TEMINAL, FASTON 111262 3
T1 TRANSFORMER,
110/220V
TRANSFORMER, 120V
TRANSFORMER, 100V
120993
121659-1
121824
3
Item
Number Description Part Number Note
1 COVER 135040
2 CHASSIS 133230 1
3 FEET 103593
4 SCREW, SHEET METAL,
4-40 x .25L 103118-04
5 CONNECTOR, XLR 121810
6 NUT, KNURLED 121890
7 STRAIN RELIEF BUSHING 106346
8 LINE CORD, 100/120V
LINE CORD, 220V 111672 113608 3
9 LED 123487
10 BRACKET, LED 120975
11 SMD PCB ASSEMBLY - 1
12 SWITCH, KNOB 120989
13 SWITCH, DUAL 107461
14 SCREW, MACHINE, 4-40
x .187L 103140-03
15 STANDOFF 123199 1
16 PCB ASSEMBLY (TOP) 122068
17 PCB ASSEMBLY (MAIN) - 1
- CARTON 121860
- FILLER 122640
- POLY BAG 100688
- ACCESSORY KIT 121783
- MTG KIT (802 COVER) 123037
- SWITCH, SLEEVE 120996
- INSULATOR 122855
- SCREW, MACHINE,
NYLON,
6-32 x .75L, 220V
124843-12 5
- SCREW, MACHINE,
NYLON,
6-32 x .25L, 220V
128843-04 5
- STANDOFF, HEX, 6 x
.375L 121828-06 5
(See Figure 4)

Figure 4. Main Part Exploded View
13

14
ELECTRICAL PART LIST
Resistors
Reference
Designator Description Part Number Note
R1, 2 2.7kΩ, 1/4 Watt, 5% 117704-
1212725
R3, 4 3.3kΩ, 1/4 Watt, 5% 117704-
1213325
R5-7, 11, 15, 118, 218 160kΩ, 1/4 Watt, 5% 117704-
1211645
R8, 9, 12, 13, 16, 17, 101, 210, 104,
204 330kΩ, 1/4 Watt, 5% 117704- 1213345
R10, 14, 18 8.2kΩ, 1/2 Watt, 5% 122071-8225
R102, 103, 105, 122, 124, 202, 203,
205, 222, 224 2.00kΩ, 1/4 Watt, 1% 119976- 2212001
R106, 206 1.9kΩ, 1/4 Watt, 1% 119976-
2211911
R107, 207 48.7kΩ, 1/4 Watt, 1% 119976-
2214872
R108, 208 20kΩ, 1/4 Watt, 5% 117704-
1212035
R109, 126, 130, 131, 209, 226, 230,
231 23.7kΩ, 1/4 Watt, 1% 119976- 2212372
R110, 210 2.74kΩ, 1/4 Watt, 1% 119976-
2212741
R111, 113, 211, 213 1kΩ, 1/4 Watt, 5% 117704-
1211025
R112, 146, 152, 212, 246, 252 4.75kΩ, 1/4 Watt, 1% 119976-
2214751
R114, 214 13kΩ, 1/4 Watt, 2% 117704-
1211332
R115, 215 10kΩ, 1/4 Watt, 5% 117704-
1211035
R116, 125, 216, 225 8.2kΩ, 1/4 Watt, 2% 117704-
1218222
R117, 128, 129, 133, 134, 217, 228,
229, 233, 234 6.81kΩ, 1/4 Watt, 1% 119976- 2216811
R119, 120, 219, 220 18kΩ, 1/4 Watt, 5% 117704-
1211835
R121, 136, 221, 236 22kΩ, 1/4 Watt, 5% 117704-
1212235
R123, 223 470Ω, 1/4 Watt, 5% 117704-
1214715
R127, 227 130kΩ, 1/4 Watt, 5% 117704-
1211345
R132, 141, 145, 153-158, 232, 241,
245, 253-258 6.04kΩ, 1/2 Watt, 1% 119976- 2216041
R135, 159, 235, 259 510Ω, 1/4 Watt, 5% 122071-5115
R137, 237 47.5kΩ, 1/4 Watt, 1% 119976-
1214752
R138, 140, 238, 240 15.0kΩ, 1/4 Watt, 1% 119976-
2211502
R142, 242 3.0kΩ, 1/4 Watt, 1% 119976-
2213011
R143, 243 33kΩ, 1/4 Watt, 5% 117704-
1213335

15
ELECTRICAL PART LIST
Resistors (continued)
Reference
Designator Description Part Number Note
R144, 244 56kΩ, 1/4 Watt, 2% 117704-
1215632
R148, 248 4.12kΩ, 1/4 Watt, 1% 119976-
2214121
R149, 249 23.7kΩ, 1/4 Watt, 1% 119976-
2212372
R150, 250 30.9kΩ, 1/4 Watt, 1% 119976-
2213092
R160, 260 22kΩ, 1/4 Watt, 5% 117704-
1212235
SMD Resistors
Reference
Designator Description Part Number Note
R1, 2 2.7kΩ, CHIP, 5% 124895-2725
R3, 4 3.3kΩ, CHIP, 5% 124895-3325
R5, 6, 7, 11, 15, 118, 218 160kΩ, CHIP, 5% 124895-1645
R8, 9, 12, 13, 16, 101, 104 330kΩ, CHIP, 5% 124895-3345
R102, 103, 105, 111, 122, 124, 202,
203, 205, 211, 222, 224 2.00kΩ, CHIP, 1% 124894-2001
R106, 206 1,91kΩ, CHIP, 1% 124894-1911
R107, 207 48.7kΩ, CHIP, 1% 124894-4872
R108, 208 20kΩ, CHIP, 5% 124895-2035
R109, 126, 130, 131, 209, 226, 230,
231 23.7kΩ, CHIP, 1% 124894-2372
R110, 210 2.74kΩ, CHIP, 1% 124894-2741
R112, 114, 212, 214 13.3kΩ, CHIP, 1% 124894-1332
R113, 213 1kΩ, CHIP, 5% 124895-1025
R115, 215 10kΩ, CHIP, 5% 124895-1035
R116, 125, 139, 152, 216, 225, 239,
252 8.25kΩ, CHIP, 1% 124894-8251
R117, 128, 129, 133, 134, 217, 228,
229, 233, 234 6.81kΩ, CHIP, 1% 124894-6811
R119, 120, 219, 220 18kΩ, CHIP, 5% 124895-1835
R121, 136, 160, 221, 236, 260 22kΩ, CHIP, 5% 124895-2235
R123, 223 470Ω, CHIP, 5% 124895-4715
R127, 227 130kΩ, CHIP, 5% 124895-1345
R132, 141, 145, 147, 151, 153-158,
232, 241, 245, 247, 251, 253-258 6.04kΩ, CHIP, 1% 124894-6041
R137, 237 47.5kΩ, CHIP, 1% 124894-4752
R142, 242 3.01kΩ, CHIP, 1% 124894-3011
R143, 149, 150, 234, 249, 250 33kΩ, CHIP, 5% 124895-3335
R144, 244 56.2kΩ, CHIP, 1% 124894-5622
R146, 246 4.75kΩ, CHIP, 1% 124894-4751
R164, 264 26.7kΩ, CHIP, 1% 124894-2672

16
ELECTRICAL PART LIST
Capacitors
Reference
Designator Description Part Number Note
C1 .0047uF, 220V
.0047uF, 1.4KV, 100/120V 120993 103447 3
C2, 3 .015uF, FILM 118091-153
C4 .01uF, CERAMIC DISC 119696-103
C5, 6 470uF, ELECTROLYTIC 110704
C7-10 1uF, ELECTROLYTIC 119942-1R0
C11-19, 22 .1uF, CERAMIC DISC 117502
C101, 117, 125, 201, 217, 225 22uF, ELECTROLYTIC 119944-220
C102, 202 2.2uF, ELECTROLYTIC 119943-2R2
C103-105, 203-205 .0068uF, FILM 118091-682
C106, 206 .33uF, FILM 123785-334
C107, 108, 121, 122, 207, 208, 221,
222 .1uF, FILM 118091-104
C109, 209 .0012uF, FILM 118091-122
C110, 126, 127, 210, 226, 227 470pF, CERAMIC DISC 119617-471
C111, 211 270pF, CERAMIC DISC 119617-271
C112, 113, 124, 212, 213, 224 .033uF, FILM 118091-333
C114, 214 .068uF, FILM 118091-683
C115, 116, 123, 215, 216, 223 .047uF, FILM 118091-473
C118, 119, 218, 219 .082uF, FILM 118091-823
C120, 220 .022uF, FILM 118091-223
SMD Capacitors
Reference
Designator Description Part Number Note
C4 .01uF, CERAMIC, CHIP 124959-103
C11-22 .1uF, CERAMIC, CHIP 124959-104
C110, 126, 127, 210, 226, 227 470pF, CERAMIC, CHIP,
10% 124956-4712
C111, 211 270pF, CERAMIC, CHIP,
10% 124956-2742

17
ELECTRICAL PART LIST
Diodes
Transistors
Integrated Circuits
Reference
Designator Description Part Number Note
U1, 8, 9 QUAD OP AMP, LS-404 120535/192166 4
U2VOLT REG, 78L15 121116-1
U3VOLT REG, 79L15 121117-1
U4 QUAD NAND CD-4011 121854
U5, 6 QUAD OP AMP, RC4156 192166 4
U7, 10 QUAD AW. SW. CD4066 119837
Reference
Designator Description Part Number Note
D1-5 ZENER, 18V, 1W, IN4746A 116995-4746A
D1, 101, 104, 201-204 1N4148, DIODE 121501
Z1 BRIDGE RECTIFIER 112027 3
Reference
Designator Description Part Number Note
Q1, 4, 5 TRANSISTOR NPN 117921
Q2, 3, 6 TRANSISTOR PNP 119168

18
VOLTAGE CONVERSION INSTRUCTIONS
220 Volt to 110 Volt Conversion 110 Volt to 220 Volt Conversion
1. 220 Volt to 110 Volt Conversion
Note: Conversions must be performed
with the line cord disconnected from any
power source. Refer to Figure 3 below for
the following procedures. The jumpers
listed in parentheses refer to the SMD
units.
1.1 Perform disassembly procedure 3,
PCB removal.
1.2 Locate jumper LK-31, (LK-35) in front
of the power transformer (near the line
cord), and remove it.
1.3 Add jumpers LK-32 (LK-42) and LK-33
(LK-43).
For European 220 Volt units.
1.4 Remove the 220 Volt line cord and
replace it with a 110 Volt line cord. Make
certain the line cord is properly installed in
the strain relief.
1.5 Perform assembly procedure 4, PCB
replacement.
1.6 Test the unit to confirm the voltage
conversion was perform correctly.
1.7 Remove the 220 Volt label on the rear
of the unit.
2. 110 Volt to 220 Volt Conversion
2.1 Perform disassembly procedure 3,
PCB removal.
2.2 Remove the two jumpers LK-32 (LK-
42) and LK-33 (LK-43).
For units with a 110 Volt transformer.
2.2 Remove the 110 Volt transformer and
C1 capacitor, and install 220 Volt compo-
nents (see the part list).
2.3 Add jumper LK-31 (LK-35). Line cord
replacement is optional.
2.4 Perform assembly procedure 4, PCB
replacement.
2.5 Test the unit to confirm the voltage
conversion was perform correctly.
2.6 Add a 220 Volt label on the rear of the
unit just below the line cord.
Voltage Conversions are to be performed on Military units. However it is possible to convert
a 110 Volt unit (by replacing the transformer) and a 220 Volt European unit.
Figure 5. Voltage Conversion Diagram

Figure 6. Top Cover Connection Diagram
19

SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE
®
®
Bose Corporation
The Mountain
Framingham Massachusetts USA 01701
P/N 129292 REV. 03 10/97 FOR TECHNICALASSISTANCE OR PART ORDERS, CALL 1-800-367-4008