Fezz Audio Silver Luna Prestige User Manual - page 12
12
ADJUSTMENT AND CONTROL OF THE BIAS CURRENTS _________
Setting and control of the bias is a procedure that is required after the first switch-on
and after the initial burn-in period of the amplifier.
Later on, we recommend to check these parameters once a month.
Please make yourself acquainted with the locations of the measuring points:
• MR1, MR2, MR3 (for the right channel)
• ML1, ML2, ML3 (for the left channel)
and of the regulation potentiometers:
• AR1 (Sets the BIAS value for the right channel)
• AR2 (Sets the BIAS balance for the right channel)
• AL1 (Sets the BIAS value for the left channel)
• AL2 (Sets the BIAS balance for the left channel)
THE PROCEDURE FOR ADJUSTMENT OF BIAS FOR THE RIGHT CHANNEL
1) Use a digital multi-meter. Set it to either automatic mode, or to manual mode,
to an operating measurement range of 2V DC. Next, please measure the
differential voltage between MR2 and MR3.
2) Adjust the balance of the BIAS by gently rotating the BIAS balance
potentiometer AR2, so as to achieve a measured differential value as close as
possible to 0 mV DC (+/-20mV).