High LG2080 power amplifier right channel volume is low, but the sound quality is good, analysis and repair: this long-term placement, suspected high tone control circuit bass control potentiometer or master volume potentiometer connection is bad, 3 potentiometer above all after the new test machine, malfunction unchanged.xLtservice manual download site
xLtservice manual download site
Switch master volume potentiometers to l, r signal wire at the amplifier level test machine, right channel sound small, this description has nothing to do with pre-level failure, faults in the right channel amplifier level. For ease of maintenance, plotting the right channel amplifier circuit, as shown in Figure 2.xLtservice manual download site
xLtservice manual download site
This circuit as the classic form of OCL, not many components affect exchange gain. Shortly before the repair of a CAV-2305 amplifier, symptom is also silent, finally detected failures due to negative feedback bypass capacitors have no capacity. According to the measured RF and RF 1 is normal, but the capacitance CF (100 μl F/63V) is almost free of charge and discharge phenomena. After using a 100 μl F/50V capacitance substitution,xLtservice manual download site
Right channel volume back to normal, in order to prevent this failure on the left channel, capacitance also left this position and also be exchanged for new ones.xLtservice manual download site