Bose 500PM Servicehandleiding - Pagina 9
Blader online of download pdf Servicehandleiding voor {categorie_naam} Bose 500PM. Bose 500PM 18 pagina's.
Pagina afdrukkenPower Amplifier
-
+
+
-
Frequency
Generator
Figure 2. Model 500PM Loudspeaker Test
Setup Diagram
Note: Refer to Figure 1. Model 500PM
Driver Wiring Diagram, for the following
procedure.
1. Phase Test
1.1 Remove the speaker grille using
Disassembly/Assembly procedure 1.
1.2 Observing polarity, apply an +8Vdc
level to the input terminals on the rear of
the loudspeaker. The drivers should move
outward.
1.3 Replace the grille using procedure 2.
Note: Refer to Figure 2. Model 500PM
Loudspeaker Test Setup Diagram, for the
following tests.
2. Rub and Tick Test
2.1 Remove the grille using procedure 1.
2.2 Apply a 6Vrms, 60Hz signal to the input
terminals on the rear of the speaker
cabinet.
2.3 Listen carefully for any buzzes, rattles,
or other extraneous noises from the drivers
or trim parts.
TEST PROCEDURES
-
+
+
-
DMM
+
Loudspeaker
-
Note: There is a normal suspension noise.
To distinguish between a rub or a tick and
suspension noise, displace the driver cone
slightly with a finger. If the noise stays the
same, it is suspension noise.
2.4 Replace the grille using procedure 2.
3. Air Leak Test
3.1 Remove the grille using procedure 1.
3.2 Apply a 6Vrms, 60Hz signal to the
input terminals on the rear of the speaker
cabinet.
3.3 Test duration should be 15 seconds
minimum.
3.4 Listen carefully for air leaks along all
glue joints, at the binding post connector,
and at transducer mounting locations. Air
leaks will be heard as a hissing or sputter-
ing sound. All repairs must be hidden.
3.5 Replace the grille using procedure 2.
4. Power Sweep Test
4.1 Apply a 6Vrms, 10Hz signal to the input
terminals on the rear of the speaker
cabinet. Leave the speaker port open.
4.2 Sweep the input frequency from 10Hz
to 5kHz, and then back down to 10Hz.
Note: The whooshing noise from the port
at approximately 60Hz is acceptable.
4.3 Replace any transducer that has a
buzzing noise. There shall not be any
buzzes or rattles from the internal
connecting wires or components.
Redress any buzzing wires.
9