Powered SubwooferBASS2/BASSWAVE
TEST PROCEDURES
Equipment needed:buzzes or any other noises. If any unusual noises
Functional/signalgeneratorare heard, remove driver and test.
TrueRMSMultimeter
IntegratedamplifierDriver Function
Cables-linelevel(RCA)andspeakercables1.Followinstructionsonpage2( ToAccessLower
Woofer ).
RCAY-cable
2.CheckDCresistanceofdriver;itshouldbe
General Functionapproximately 5.2 ohms. Upper (non-removable)
driver can be checked by disconnecting both the
UUT = Unit Under Testwires to the amplifier and the lower driver, then
1.Connectbothrightandleftlinelevelinputs(RCA)
to signal generator and UUT. Assure inputconnecting the test meter to the wires.
button is in depressed position. Use Y-cable if3.Connectapairofspeakercablestodriverterminals.
necessary from mono source.Cables should be connected to an integrated
amplifier fed by a signal generator. Turn on
2.Turnongenerator,adjustto50mV,50Hz.Plug
in UUT, turn level control full clockwise.generator and adjust so that speaker level output
is 4.0V.
3.GreenLEDshouldlight,immediatebassresponse4.Sweepgeneratorfrom20Hzto1KHz.Listento
should be heard and felt from port tube openings.
driver for any rubbing, buzzing, or other unusual
4.Turnoffgenerator,unplugunit,disconnectRCAnoises.
cables.* The upper woofer in non-serviceable. Order
replacement cabinet/upper driver assy.
5.Connecttwopairofspeakercablestohighlevel(Part#BASSWAVEENCLKIT). Also cone/diaphram
input terminal on UUT. Assure input button is inkits not available, defective drivers should be
extended (out) position. Cables should bereplaced.
connected to an integrated amplifier fed by the signal
generator. Observe polarity of speaker cables.
6.Turnongeneratorandadjustsothatspeakerlevel
output is 2.0V, 50 Hz. Plug in UUT, turn level
Service Notes/Revisions
control full clockwise.
In the event you receive a unit with the complaint that
7.GreenLEDshouldlight,immediatebassresponsethe unit shuts down after it is on for a while", usually
should be heard and felt from port tube openings.about 10-15 minutes. (Verify the R46 has not been
changed with a jumper already; then proceed with
modification of the amplifier unit).
Sweep Function
1.Connectbothrightandleftlinelevelinputs(RCA)toThis should be performed on units with circuit board
marked Rev. 001 to Rev. 003.
signal generator and UUT. Assure input button is
in depressed position. Use Y-cable if necessary
from mono source.If you have found output devices Q4 or Q5 shorted,
replace with matched pairs only. This is critical for
2.Turnongenerator,adjustto50mV.PluginUUT,proper amplifier operation.
turn level control full clockwise.Procedure: Locate R46 (33 ohm) and replace it with a
3.GreenLEDshouldlight,immediatebassresponse22 gauge jumper wire. After verifying normal turn-on,
should be heard and felt from port tube openings.load the amp with a 4 ohm watt resistor and apply a
70 Hz, 200 mV signal to one RCA input jack. Let the
amp run for about 20 minutes to confirm the amp no
4.Sweepgeneratorfrom20Hzto300Hz.Listentolonger shuts down.
the cabinet and drivers for any rattles, clicks,
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ACEC
