Velleman К8060 Manual do Utilizador descarregar pdf (Página 16)

Test & adjustments

 Turn the RV1 bias adjust trimmer fully counter clockwise (turn left) before applying power for the first time.

ADVICE: For safe first-time testing insert a 60W light bulb in series with the AC power and the transform-

er. If the light bulb lights up continuously, disconnect the transformer and check all your wiring and as-

sembly. Reconnect the power supply. If the lamp remains off, everything is OK, replace the light bulb with

a fuse.

If the TR8040 transformer is used there is a selection of primary AC voltage :

120Vac: black / brown.

230Vac: black/orange.

IMPORTANT: Insulate the wire that is not being used.

NOTE: Two amplifiers and two transformers are required for stereo. Never attempt to run two amplifi-

ers from a single transformer!

Setting the bias:

 Connect a multimeter (lowest DC voltage range 1V or lower) over the leads of R19 (polarity is indicated on

the PCB).

 Turn on the power, the power LED should light.

 Check the multimeter, it should read 0V, adjust RV1 carefully to about 10mV (0.01V) Wait a few minutes

until the meter reading remains stable.

 Turn off the AC power. The amplifier is now ready for use.

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