Symptoms:FVmservice manual download site
When the left and right channel volume large small, rotate volume knob speaker makes a lot of electricity, signal switch sometimes have to move a muscle.FVmservice manual download site
Analysis of maintenance:FVmservice manual download site
FVmservice manual download site
Above is a typical aging, aging volume knob, switch not working, but the import switch no substitution product, if you simply spray cleaning agent, maybe could work, but certainly can't last for long, because the switch structure complex, cleaning agent does not complete removal of oxide layer on the contacts. Only the switch removed, completely after each touch-point is removing the oxide layer, to help it reach the new effect, in a few years there will not be the same problem.FVmservice manual download site
FVmservice manual download site
That day @# the APLS Alps volume potentiometer potentiometer, 50K duplex. The potentiometer is available in the Chinese market, but genuine expensive imitations, the majority, and the price is not low. Genuine APLS Alps potentiometer and imitation there is not much difference in appearance, invisible, apart and can be found, like screws is not refined enough, resistance is not carbon but composed of several small resistance circle. This is the most obvious difference. Good cleaning switch, replaced after a potentiometer, the machine does not have other problems, performance is good.FVmservice manual download site