Bose 1800 Instrukcja serwisowa - Strona 29

Przeglądaj online lub pobierz pdf Instrukcja serwisowa dla Wzmacniacz Bose 1800. Bose 1800 32 stron.

Subject: Output Transistors

Remarks:

Due to supply demands, Bose

and the 1800 amplifier boards currently being produced. The transistors have been change

from Bose P/N 102433 (2N5840) to P/N 117579 ( Motorola MJ15011). The new output transis-

tors are not compatible with the original 102433 transistors. If you service an 1800 power

amplifier or PM-2 mixer, check the serial numbers on the printed circuit board and the P/N on

the output transistors to see which output device is being used. Below is a list of the approxi-

mate serial number break for the newer P/N 117579 transistors.

PM-2 Boards:

1800 Boards:

PM-1 Boards:

1801 Boards:

When replacing output transistors, you must use the correct replacement device. Older units

with P/N 102433 on the output transistors must be replaced with 102433 (2N5840) transistors.

Units with output transistors with P/N 117579 must be replaced with 117579 (MJ15011) transis-

tors.

SERVICE BULLETIN

Corporation has changed the output transistors on the PM-2

Approximately 30800 and above

All have P/N 102433

Date: 10/13/1980

Bulletin # Pro-81-001