To further determine the fault location, the feedback loop for each node voltages were measured : C446 positive terminal of 23V, C447 positive terminal of 3V. Two voltage measurements were significantly lower , indicating that the loop current increases ( due to the resistance of two resistors simultaneously increasing the likelihood of smaller ) . According to the figure marked on resistor analysis , after a short circuit fault on the C447 R418 impossible to press down to 3V, while the voltage across R420 basically the same , indicating that the branch current is small. In summary, the largest C447 suspicious leakage . But check C447 undamaged . Then noticed the impact of D602 branch , is it maintenance switch S601 leakage or accidental dialing of the "S" position ? Investigation , S601 correct position. Rx10k blocked the road with a multimeter measuring D602 reverse resistance , hands deflection to almost 0Ω place. Analyzing S601 leakage between the "S" and the midpoint of the ground terminal ( D602 reverse resistance measurement , the hands actually indicated S601 "S" to the ground terminal via the resistor value between D602 ) . Because of the maintenance switch usually no effect, it is disconnected D602 end , the test machine troubleshooting.qGXservice manual download site

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