Bose PowerMatch PM8250 Service Manual

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9. Amp 1 / Power Supply Fan Removal
Note: The fans located on the mounting plate at the front of the chassis cool both Amp 1 and
the Power Supply PCB.
9.1 Perform procedure 1.
9.2 Unplug the wiring harnesses at J9 and
J11 on the digital board. J9 powers the Amp1
fan and J11 powers the power supply fan.
9.3 Lift out the mounting plate with the fans
mounted to it. Remove the two screws that
secure the fan to the mounting plate. Lift off
the fan.
Re-assembly Note: Be sure to install the
replacement fan so that it blows air from the
front of the chassis to the rear.
10. Amplifier 2 Fan Removal
10.1 Perform procedure 1.
10.2 Unplug the fan wiring harness from the
digital PCB at J10.
10.3 Remove the two nuts that secure the
fan to the chassis. Lift off the metal bracket
that surrounds the fan. Lift out the fan.
Note: Be sure to install the replacement fan
so that it blows air from the front of the
chassis to the rear.
DISASSEMBLY PROCEDURES

Bose PowerMatch PM8250 Specifications

General

Damping factor	1000
Amplifier class	D
Audio output channels	- channels
Peak power per channel	- W
Signal-to-Noise Ratio (SNR)	99 dB
Total Harmonic Distortion (THD)	0.4 %
Bridge-mode power output per channel (4 Ohm)	500 W
Purpose	Performance/stage
Equalizer	Yes
Product color	Black
Connectivity technology	Wired
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Speakers connectivity type	-
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 90 %

Weight and Dimensions

Depth	525 mm
Width	483 mm
Height	88 mm
Weight	11100 g