This machine boot detection is normal, but in use process to replace a spare battery, after boot, flash out of the indicator, the machine doesn't work, boot after the machine again. rPcservice manual download site
 rPcservice manual download site
According to the fault phenomena, preliminary judgment fault in the power circuit and could go on/off control circuit. Open the machine right shell, circuit board, according to the physical draw the machine local power circuit is shown in figure 1. Check the machine power switch button can be shut off properly. Battery to the machine, electric, turned on the power switch is in the road test, the multimeter test battery and circuit sitting (AO935 board) interface, (10) ~ (14) foot voltage of 7.8 V, normal, insurance resistance measurement IP1001 a voltage of 7.8 V, the other end for OV, apparently not. Remove the battery, use multimeter test, found that insurance resistance IP1001 has open circuit. Replace the resistor, restarting, machine, or no response, so the test boot control circuit. Measuring boot QR1001 emission is 7.8 V, control switch tube collector for OV, normal should be 7.6 V, measuring the base for OV, normal should be 7. OV, obviously the pipe work is not normal, explain QR1001 does not have working conditions (see photo) circuit. Measuring QR1001 R1001 base resistance of 47 k Ω, normal; Measuring the other control tube QR1OO2 UN921F grounded emitter, collector for OV, base is 0.4 V, a strikingly low voltage (normal voltage of 3.3 V) on startup. Boot QR1OO2 base voltage from the CPU control circuit, the QR1OO2 base impending, restarting, the solder joint voltage of 3.4 V, boot CPU has output voltage, but QR1002 without work, analyzing the tube may be damaged. Remove the triode QR1OO2, use multimeter test, confirmed that has been damaged, so caused QR1001 QR1OO2 damage is not work. Replace it with the same triode after boot, the machine back to normal, each index is good. This paper analyzes the reasons of the above problems, the battery may be replaced for the boot instantaneous electric current too big, cause the damage of components.

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