Calibrations And Adjustments - Classe Audio CAM-200 Service Manual

Calibrations and Adjustments

Bias adjustment:
Note: Bias adjustment should be made without any load connected to the amplifier's output, and no signal
connected to the amplifier's input.
1. Connect a multimeter to R112 leads and set the multimeter to mV scale.
2. Turn trimpot R104 counterclockwise until it reaches 0 . A click should be heard.
3. Turn on amplifier, and let it warm up for 15 minutes on idle.
4. Adjust trimpot R104 to get a 10mV reading.
5. Repeat procedure with R212 and R204
6. Let the amplifier warm up for a 24 hours period with signal and load.
7. Remove signal and load, and reconnect the multimeter, setted to mV scale, to R112 leads.
8. Readjust R104 to get a 12mV reading.
9. Repeat procedure with R212 and R204
DC offset:
Note: DC offset adjustment should be made without any load connected to the amplifier's output, and no
signal connected to the amplifier's input.
On these units, DC offset can't be adjusted. Measure DC offset using a voltmeter connected to the output
posts, scale setted to mV. DC offset should be less than 10mV.
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