Bose Acoustimass 3 Series Manuel d'entretien - Page 20
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Satellite Test Procedures
NOTE: Use these procedures only when
satellites come in to be serviced (without the
bass module).
1. Sweep Test
A. Connect an oscillator to a power amplifier.
Adjust the amplifier output to 4 Vrms. Connect
the amplifier leads to the satellite (cube speaker)
input terminals. Sweep the oscillator from 100 Hz
to 5 kHz. If any twiddler buzzes or sounds
distorted,replace it.
2. Phase Test
NOTE: Supply voltage should only be
momentarily applied to the satellite input
terminals to avoid possible damage to the
twiddlers.
A. Set a DC power supply to 8 volts. To ensure
that each twiddler is connected in phase, connect
the positive supply lead to the positive (+)
satellite input terminal (red) and the negative
supply lead to the negative (-) satellite input
terminal (black). The twiddler should move
outwards with the application of the supply
voltage.
NOTE: If any twiddler cone deflects inwards or
does not move,check all connections.
Woofer (Module) Test Procedures
NOTES: Use these procedures only when a
module comes in to be serviced (without
satellites). All tests should be performed with the
bass and treble control knobs in the normal or
"detent" position and the volume control knob at
maximum volume.
It may be necessary to disassemble the module
in some of these procedures. Refer to the
Disassembly/Assembly Procedures section for
specific instructions.
AM-3P TEST PROCEDURES
1. Turn-On Test
NOTES: Refer to the AM-3P EQ PCB schematic
for the location of the J7 mini-jack input,pins 1
and 3. It is contained in the On/Off Control
circuit on this schematic.
This test can be performed with a fully
assembled module.
This procedure also refers to the "ring" and
"sleeve" of a standard 3.5 mm mini-jack.
A. Connect an oscillator to the module's L/R
audio input terminals. Adjust the oscillator to 500
Hz,220 mVrms.
B. Insert a 3.5 mm mini-jack into the input
terminal labeled "System Control". The audio
signal should mute.
C. Set a DC power supply to 8 volts and apply
this voltage between pins 3 (ring) and 1(sleeve-
which is connected to ground) of the mini-jack.
The audio signal should return.
2. Sweep Test
NOTE: This test can be performed with a fully
assembled module.
A. Connect an oscillator to the module's L/R
audio input terminals. Adjust the oscillator to 100
Hz,220 mVrms. Sweep the oscillator from 10-
300 Hz. There should not be any
loud,extraneous sounds. If there are any loud
buzzes or distortion,replace the woofer.
NOTE: There should not be any buzzes or rattles
from within the module. Redress any wire or
component that buzzes or rattles.
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