The fault is caused by using an external battery power supply more. When the battery connected to the machine, the polarity against making machines vlB03957-2 small plate R1606 Ω (25 m) burn out. By measuring R1606 normal, electricity measurement VEP03A86 (another big plate Numbers for VEP03945) board 12 v power supply socket p IN voltage is normal. Fault in the main board, according to the fault phenomena from the power switch and the indicator light is not bright people solve, circuit as shown in figure. SW6517 the power switch of the figure, $136507 is the red power indicator light. Inspection found no 5 v power supply, make IC6004 does not work. 5 v voltage regulator circuit shown in figure 3. IC6010 measurement (1) the no 5 v voltage, (3) end only about 2 v voltage, explain Q6010 bad, in 2, after sd401 substitution Q6010 IC6010 1 foot still no voltage output. In 7805 after the substitution IC6010 machine back to normal.gDqservice manual download site