First suspected to be bad or the remote control the remote control battery power shortage, reflect upon the user remote control ever has people detection, and replace with a new battery, try machine on another machine to confirm the remote control, no problem.ZJpservice manual download site
In the CPU (8) feet (see figure) to indirectly into the multimeter, then try remote control machines, measuring CPU port remote control signal (8) feet wave meets the requirements. Proven receiver and amplifier circuit is normal. For other interactive features is also normal. Preliminary judge CPU damage is unlikely.ZJpservice manual download site
So concentrate on examining the CPU work the three preconditions: the power, reset, and clock oscillator circuits, when the oscilloscope used to detect when Crystal y, 8MHz crystals from malnutrition. To get a new trial after it. Effect is still not apparent, further with a capacitance meter detect C4, C5 (25pF) two oscillation capacitors, C4, C5, there are varying degrees of capacity decreases, C4, C5, after replacement, operation volume the "+" and "-" keys function returns to normal.ZJpservice manual download site