Disassemble the machine, electricity measurement IC601 (CPU) voltage on both ends of the crystals, voltage of + 1.6 V, 78 feet, 77 feet to + 0.9 V, as shown in figure 3. Check the + 5 v power supply is normal, judge fault in the system clock circuit. Power check 77 feet over the ground resistance, only a few hundred o remove C608 test normal, measuring 77 feet over the ground resistance back to normal again. Substitution C608, fault is still. Here are carefully observed C608 patch capacitance red gum, welding C608, again the red glue clean, welding C608 back, repeated commissioning, troubleshooting, hence the delivery. But after a few days later, the customer to send a again, according to the fault. IC601 disassemble the machine, test the voltage of 77 feet for 6 V + 1, 78 feet voltage is + 0.8 V only, then according to the above methods will C607 below red rubber processing clean, fault line completely .jwCservice manual download site
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