Bose 302 A Service Manual

5
The transformer is set at the factory for 70V, 100W operation.
• To change from 70V to 100V operation, replace the orange wire with the yellow wire (orange wire
70V, yellow wire 100V).
• To change from 100W output, replace the red wire with:
• Green for 50W output
• Violet for 25W output
• Blue for 12.5W output
Caution: Do not remove or replace the black ground wire. To prevent wires from shorting, all
wires that are not connected must be covered with shrink tube or a wire nut.
Figure 2. Transformer Wiring
DISASSEMBLY/ASSEMBLY PROCEDURES
(Refer to Figure 4)
Boss 1
Boss 3
Red wire
(-) Woofer
(-) Terminal
Green wire
(-) Twid 2
Figure 1. Wiring Diagram
10. Crossover Capacitor Replacement
10.1 Connect the leads of the capacitor (3) to
the wires and solder the connections. The
capacitor is wired in series with the woofer’s
(1) positive terminal and the Twiddler
TM
driver’s
(2) positive terminal. Refer to Figure 1 and 3.
10.2 To prevent air leaks, use a new Twiddler
driver panel (11) and gasket (12). Line up the
Twiddler panel with the cabinet and replace
the four screws (16) that secure it to the
baffle.
TRANSFORMER WIRING
BLK
RED
WHITE
ORANGE
JUMPER
WIRES
BLK
RED
GREEN
VIOLET
BLUE
YELLOW
70V
100V
50W
25W
12.5W
OUTPUT
INPUT
PARALLEL
INPUT
100W
Wiring Schematic
From To Wire
Twiddler
driver 1 (-)
Twiddler
driver 2 (+)
Gray
Twiddler
driver 1 (+)
Capacitor
(item number 3)
Yellow
Capacitor
(item number 3)
Woofer (+) Black
Twiddler
driver 2 (-)
Lug at boss 3 Red
Woofer (+) Terminal (+) Yellow
Woofer (-) Terminal (-) Green
Terminal (-) Lug at boss 1 Green

Bose 302 A Specifications

General

Brand	Bose
Model	302 A
Category	Speakers
Language	English