Alignment Procedures; Model: Sw12-I - Klipsch SW12-I Service Manual

Klipsch Subwoofer Amplifier Service Manual
SW12-I AMPLIFIER ALIGNMENT PROCEDURE
Lethal voltages are present and exposed when cover is off of amplifier.
Only qualified service technicians should attempt to repair or align subwoofer amplifiers.
Equipment required:
A signal source capable of supplying a 30Hz sine wave at 300mVrms.
A true RMS Voltmeter such as the Fluke 8060B.
A 16 ohm load rated for at least 200 Watts.
An oscilloscope (optional).
To totally align SW12 series 1 amplifiers, follow this procedure:
1. Disconnect power from the UUT (unit under test).
2. Connect the UUT (unit under test) to a 16 ohm load.
3. Connect a signal generator to the RCA input of the amp.
4. Set all controls on the UUT to their full clockwise position.
5. Set the signal generator for 30Hz and 60mVrms output.
(be sure and measure the output of the generator for 60mVrms.)
6. Connect the voltmeter leads to the output of the UUT.
7. Apply power to the UUT.
8. Adjust R34 for 33Vrms. Range is from 32.1 Vrms to 34 Vrms.
9. Change signal level to 1.5mVrms @ 30Hz .
10. Measure the output voltage. Should be between .94 Vrms and 1.06Vrms.
Adjust R30 if necessary.
* NOTE: Some interaction between adjustments is common. Recheck steps 8 and 10 for
proper voltages.
11. Alignment of the UUT is now complete. Disconnect power and other
connections from the UUT.
CAUTION!
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