Bose PowerShare PS404A User Manual

81
DISASSEMBLY PROCEDURE
7.3 Remove the two screws that secure the AC
power switch to the back of the front bezel. Lift it
straight off.
7.4 Remove the four screws that secure the front
bezel to the front panel. Lift off the plastic front
bezel.
8. Fan Assembly Removal
8.1 Perform procedure 1.
8.2 Disconnect the fan wiring harness from the
SMPS PCB at J204 or J205.
8.3 Remove the four screws that secure
the fan assembly to the chassis. Lift the fan
assembly out of the chassis.
9. SMPS PCB Removal
9.1 Perform procedure 1.
9.2 Gently remove the air bafe from the SMPS
PCB where it is glued to the capacitors.
Re-assembly Note: You will need to re-install
the air bafe and secure it in place using RTV or
similar. Failure to re-install the air bafe will result
in chassis overheating.
9.3 Disconnect the AC wiring harness at J203.
Disconnect the amplier PCB wiring harness at
J202. Disconnect the DSP wiring harness at J201.
Disconnect the fan wiring harnesses at J204 and
J205.
9.4 Remove the six screws that secure the SMPS
PCB to the chassis. Lift out the SMPS PCB
assembly.
10. Amplier PCB Removal
10.1 Perform procedure 1 to remove the top cover.
10.2 On the bottom of the chassis, remove the two
screws that secure the amplier PCB’s heatsink to
the chassis.
10.3 Gently remove the two air bafes from the
Amplier PCB heatsink.
Re-assembly Note: You will need to re-install
the air bafe and secure it in place using RTV or
similar. Failure to re-install the air bafe will result
in chassis overheating.
10.4 Disconnect the wiring harnesses at J300 and
J400. Disconnect the ribbon cables at J100 and
J101.
10.5 Remove the four screws that secure
the Amplier PCB to the chassis. Lift out the
Amplier PCB assembly.
Re-assembly Note: Be sure to re-install the two
screws that secure the amplier PCB heatsink to
the bottom of the chassis.
11. AmpLink PCB Removal
11.1 Perform procedure 1 to remove the top cover.
11.2 Unplug the wiring harness at J409 and J403.
Disconnect the ribbon cables at J400, J404, J405
and J406. Unsolder the jumper wire to the DSP
PCB below the AmpLink PCB.
Re-assembly Note: The ribbon cable at J404 on
the AmpLink PCB connects to J100 on the Amp
PCB nearest the AmpLink PCB. The ribbon cable
at J405 connect to the Amp PCB furthest away
from the AmpLink PCB.
11.3 Remove the two screws on the rear panel
next to the AmpLink RJ45 connectors. Remove the
three screws that secure the PCB to the standoffs.
11.4 Lift out the AmpLink PCB.
12. DSP PCB Removal
12.1 Perform procedure 11.
12.2 Unplug the ribbon cables at J603 and J604.
12.3 Remove the three standoffs and one screw
that secure the DSP PCB to the chassis. Lift out
the DSP PCB.

Bose PowerShare PS404A Specifications

General

Purpose	-
On/off switch	Yes
Product color	Black
Connectivity technology	Wired
Audio output channels	4.0 channels
Peak power per channel	400 W
Signal-to-Noise Ratio (SNR)	100 dB
Total Harmonic Distortion (THD)	0.04 %
Ethernet LAN (RJ-45) ports	1
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (standby)	14 W

Weight and Dimensions

Depth	414 mm
Width	483 mm
Height	44 mm
Weight	6400 g