Test the power supply voltage, plus or minus 40 Volt working voltage under normal after former Working voltage is 5 volts, 12 volt positive and negative, are normal, good filter. This machine has three circuit boards, one is the power supply rectifier, a Panel is displayed, another is the stage before and after, so easy to dismantle and repair.pWaservice manual download site
pWaservice manual download site
Moreover, the Board back and forth on the identification of the level there is an obvious distinction, has brought about great convenience to detection. First use the oscilloscope to track signals to, after the signal from the input enters the switching relay, in the top level, because it is a stereo two channel amplifier, all the signals are in the process of two-way symmetric, tracking easier. Measurement amplifier signal input signal only one channel, indicating points of failure before. Measuring signal before processing input and output are the same signal box, signal out here later to balance potentiometer,pWaservice manual download site
To balance on two feet on the potentiometer only one set of output, after connecting it with wire to test the machine right channel sound back to normal, indicating failures are caused by the aging balance potentiometer. Replace the balance potentiometer after failover.pWaservice manual download site