Analysis of repair: the remote control signals via the IC1 (MKS112-001) process from each of the subsections, and foot forward and backward control signal is output, LEDs in series respectively forward control signal circuit, the led is blinking, indicating remote control signal output, judging failure follows the potentiometer rotation control circuits. Multimeter to test four driver tubes Q1~Q4, Q3, Q4, c no voltage and the voltage from the +5V voltage, L0, c, enter Q1, Q3, along the lines found L0 unsoldering. Rewelding L0 after commissioning, troubleshooting.Mjhservice manual download site