BOSE 300 PM Service Manual
SUPPLEMENT
Model 300PM Loudspeaker
The following parts used in the Model 300PM Loudspeaker SmartProtect 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. This applies to units with the
SmartProtect crossover assembly only. For units that use the lamp/PTC crossover,
see the back of this sheet.
Refer to the Model 300PM Loudspeaker service manual, Bose part number 193626 for all
disassembly/assembly and test procedures.
Reference
Designator
PTC1 Polyswitch, 60V, 4mm 190348-1 190348-025 1
PTC2 Polyswitch, 60V, 4mm 191995-1 190348-040 1
Description Old Part
Number
New Part
Number
Qty per
Assy.
300PM Topside Component and Bottom
Etch Layout Diagram
ECN: 25008
Date Issued: 2/99
©
1999 Bose Corporation
300PM Topside Component and Top Etch
Layout Diagram
Supplement
Part Number 193626-S2 Rev. 00
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.
Ref.
Des.
Item
Number
Description Old Part
Number
New Part
Number
Qty
per
Assy.
PTC2 2 Polyswitch, 60V, 4mm 191995-1 190348-040 1
PTC1 3 Polyswitch, 60V, 4mm 191996-1 190348-090 1
YELLOW
BLUE
RED
1
2
C1
3
M
PTC1
PTC2
4
FOIL
TAPE
DS1,
(2X)
5
DS2
BLUE
L1
M
GREEN
BLACK
6
7 8 9 10
11 12
(4X)
Model 300PM Loudspeaker PTC/Lamp Passive Crossover Assembly Layout Diagram
Loading...