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SUPPLEMENT
The following parts used in the Model 300PM Loudspeaker PTC/lamp passive crossover
assembly have changed. Be sure to use the correct part as listed in the table below when
replacing the polyswitches in the crossover assembly.
Refer to the Model 300PM Loudspeaker service manual, Bose
¨ part numbers 193626-S1
for all disassembly/assembly and test procedures.
(2X)
(4X)
M
M
L1
PTC2
C1
DS1,
DS2
PTC1
FOIL
TAPE 1 2 3 4
5
6
7 8 9 10
11 12
RED YELLOW
BLUE
BLACK
GREEN
BLUE
Model 300PM Loudspeaker PTC/Lamp Passive Crossover Assembly Layout Diagram
Ref.
Des.Item
NumberDescription Old Part
NumberNew Part
NumberQty
per
Assy.
PTC2 2Polyswitch, 60V, 4mm 191995-1 190348-040 1
PTC1 3Polyswitch, 60V, 4mm 191996-1 190348-090 1
