BOSE 203 Service Manual
MODEL 203™ LOUDSPEAKER
®
®
©2010 Bose Corporation
Service Manual
Reference Number 193625-SM Rev. 02
CONTENTS
Specifications......................................................................................................................2
Disassembly/Assembly procedures...............................................................................3-4
Test Procedures .................................................................................................................. 5
Figure 1. Model 203™ Loudspeaker test setup diagram ................................................................ 5
Figure 2. Model 203 Loudspeaker Crossover Assembly topside and etch layout diagram............. 6
Figure 3. Model 203 Loudspeaker Driver wiring diagram ............................................................... 6
Figure 4. Model 203 Loudspeaker Crossover Assembly schematic diagram ................................. 7
Model 203 Loudspeaker Crossover Assembly part list (per figure 5)............................ 8
Figure 5. Model 203 Loudspeaker Crossover Assembly layout diagram ........................................ 8
Model 203 Loudspeaker part list (per figure 6) ................................................................ 9
Figure 6. Model 203 Loudspeaker exploded view........................................................................... 9
Model 203 Loudspeaker packing list (per figure 7)........................................................10
Figure 7. Model 203 Loudspeaker packing diagram ..................................................................... 10
Optional 70/100V Transformer Accessory part list and installation............................. 11
CAUTION: THE MODEL 203 LOUDSPEAKER CONTAINS
NO USER-SERVICEABLE PARTS. TO PREVENT WARRANTY
INFRACTIONS, REFER SERVICING TO WARRANTY
SERVICE STATIONS OR FACTORY SERVICE.
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.
SPECIFICATIONS
Model 203™ Loudspeaker Versions: 6 Ohm, 100 Watt, (no transformer)70/100V,
80Watt,(transformer accessory)
Impedance: 6 Ohms Nominal, 4.8 minimum from
20Hz to 20kHz.
Frequency Range: 60Hz to 16kHz, 3dB
Beamwidth: Vertical: 132°Horizont al: 185°
Port (each side): Flared slot port tuned to 60 Hz.
Shading Network Assembly: 10uF capacitor with 0.065 mH
series inductor
Internal Cabinet Volume: 5.7 Liters (347 cu.in.) net
External Dimensions: 12.83"L x 8.43"D x 7.25"H
(32.6cm x 21.4cm x 18.42cm)
Sensitivity (1W, 1m): 83.8dB SPL (calculated), freefield, per
IEC-268-5 (for octave-band centered at 400Hz).
Power Handling: 100W (24.5 Vrms) continuous
Weight: 1 1.5 lb (5.2 kg) each
Shipping Weight: 25.5 lb (1 1.6 kg) per packed p air
2
DISASSEMBLY/ASSEMBLY PROCEDURES
Note: Refer to Figure 6 for the following
procedures.
1. Grille removal
1.1 Using your fingers, grasp the grille (1)
edge nearest the port slot and gently pull
the grille away from the cabinet until it
comes free.
1.2 Grasp the opposite edge of the grille
and gently pull it away from the cabinet
until it comes free as well.
2. Grille replacement
2.1 Orient the grille (1) so that the Bose
logo (14) is aligned with the print on the
rear of the cabinet.
2.2 Align the two grille posts on the curved
grille edge with the cabinet post holes and
press the grille edge in place.
2.3 Align the two grille posts at the
opposite grille edge with the grille socket
grommets (4) and press the grille in place.
The grille should be neat and flush with the
cabinet.
4. Driver replacement
4.1 Observing polarity, solder the wires
from the crossover assembly (5) to the
driver (3) terminals.
4.2 Orient the driver correctly into the
cabinet and secure it using the screws (2)
removed in procedure 3.2.
4.3 Replace the grille (1) using
procedure 2.
5. Crossover Assembly removal
®
5.1 Remove the grille (1) and angled
driver (3) using procedure 3.
5.2 Remove the batting material and retain
it for replacement later.
5.3 Using a long shaft phillips-head
screwdriver, remove the four screws that
secure the crossover assembly (5) to the
interior of the speaker cabinet.
5.4 Unsolder the driver and barrier
connector (10) wires from the crossover
assembly.
3. Driver removal
3.1 Remove the grille (1) using
procedure 1.
3.2 Using a phillips-head screwdriver,
remove the three screws (2) that secure the
driver (3) to the speaker cabinet.
3.3 Using your fingers, grasp the plastic
basket of the driver and pull gently. The
driver should come free.
3.4 Note the driver wiring color code, and
cut the wires as close to the terminals as
possible.
Note: Refer to Figure 3. Model 203™
Loudspeaker driver wiring diagram, for
the following procedure.
6. Crossover Assembly replacement
6.1 Solder the driver (3) and barrier
connector (10) wires to the appropriate
locations on the crossover assembly (5).
6.2 Secure the crossover assembly to the
interior of the speaker cabinet in the
previous location using the four screws
removed in procedure 5.3.
6.3 Replace the batting material removed
in procedure 5.2.
6.4 Replace the driver and grille (1) using
procedure 4.
3
DISASSEMBLY/ASSEMBLY PROCEDURES (CONT.)
7. Barrier connector removal
7.1 On the rear of the loudspeaker,
remove the two (11) screws that secure the
barrier connector to the plate (9).
7.2 Grasp the barrier connector and pull it
straight out away from the loudspeaker.
It should come free.
7.3 Cut the wires as close to the terminals
as possible.
7.4 Retain the barrier strip gasket (12) for
replacement later.
8. Barrier connector replacement
8.1 Observing polarity, solder the
loudspeaker wires to the barrier connector
(10) leads.
8.2 Slide the barrier connector into the
speaker cabinet. Be sure it is oriented
properly.
8.3 Secure the barrier connector to the
speaker cabinet using the two (11) screws
removed in procedure 7.1.
4
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