Bose PowerShare PS404A User Manual

80
DISASSEMBLY PROCEDURE
PS404A and PS604A Ampliers
DANGER: SHOCK HAZARD
The PowerShare ampliers have high voltage
(up to 400 VDC) on the heatsink and much of
the circuitry on the power supply PCB during
operation. These PCBs can retain a dangerous
charge for a signicant period of time.
- DO NOT touch the power supply heatsink when
the amplier is operating.
- DO NOT use the power supply heatsink as a
ground point for test equipment. Damage to your
equipment could result.
- Allow at least ve (5) minutes after operation
before removing the cover or attempting to
replace a PCB assembly.
Note: Refer to Figure 3 (page 79) for the
following procedures.
1. Top Cover Removal
1.1 Remove the twelve screws that secure the
top cover to the chassis. Lift off the top cover.
2. Rack Ear Removal
2.1 Remove the three screws that secure the
rack ear to the chassis. Lift off the rack ear.
3. Rear Bracket Removal
3.1 Remove the three screws that secure the
rear bracket to the chassis. Lift off the rear
bracket.
4. Front Panel Removal
Re-assembly Note: Make a note of the wiring
harness routings and tie wrap locations for the
following procedure. You will need to re-install all
of the tie wraps in the same locations in order to
avoid noise pickup after repair.
4.1 Perform procedure 1.
4.2 Remove the three screws that secure the
bottom of the front panel to the chassis.
4.3 Disconnect the AC wiring harness from the
SMPS PCB assembly at J203.
4.4 Disconnect the AC wiring harness blue and
brown wires from the IEC AC inlet.
4.5 Disconnect the AC wiring harness green/yellow
ground wire from the chassis.
4.6 Unplug the wiring harness on the front panel
LED PCB assembly at J409 on the AmpLink PCB.
4.7 Disconnect the air bafe from the Amplier
PCB heatsink. This air bafe runs over to the LED
PCB and is secured with two screws.
Re-assembly Note: Be sure to re-install the
air bafe after repair of the unit. Secure the air
bafe to the amplier PCB heatsink using RTV
compound, or similar. Failure to re-install the air
bafe will result in chassis overheating.
4.8 Remove the one screw that secures the bottom
of the LED PCB to the chassis. Lift off the front
panel assembly.
5. AC Power Switch Removal
5.1 Perform procedure 1.
5.2 On the front panel, remove the AC power
button by pulling it straight off.
5.3 On the back of the AC power switch, remove
the two screws that secure it to the front panel. Lift
out the AC power switch.
6. LED PCB Removal
6.1 Perform procedure 4.
6.2 Remove the four screws that secure the LED
PCB to the front panel. Lift off the LED PCB.
Re-assembly Note: Be sure to re-install the air
bafe to avoid chassis overheating after repair.
7. Front Bezel Removal
7.1 Perform procedure 6.
7.2 Remove the AC Switch button from the front
panel by pulling it straight off.

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