The fault is electric does not boot, the power indicator light intermittent two flashes. iucservice manual download site
 iucservice manual download site
This is to send a repair shop SC board, the power indicator light flashing regularly is to protect the hint, hint the fault is the protection circuit of SC launched, might have a power supply circuit, check the main working voltage. iucservice manual download site
 iucservice manual download site
Electric machine will automatically shut down, start a little bit about the voltage indicator light flashing, entered the state protection. Remove the plug SC20 again electrify, machine protection, no longer have a voice, a black screen. iucservice manual download site
 iucservice manual download site
Then one by one, measuring several protection diode voltage, found D6584 high level (close to 5 v), to measure each main work voltage, found that only Vsus/Vbk and + 15 v normal, Vset/Vscn/Vad and sent dozens of fu (or high or low), fault should be out on the public channel. iucservice manual download site
 iucservice manual download site
 iucservice manual download site
To reconnect SC20 in boot instantaneous measurement SC20 1 foot (+ 5 v power supply foot) voltage close to 0 v, shutdown measurement point of resistance was close to "0". iucservice manual download site
 iucservice manual download site
Remove the SC board, one by one to pick the pieces that are "+ 5 v power supply IC (IC6601-3 / IC6605-7), the power supply of the foot, then over the ground resistance measurement SC20 1 foot, when choose open IC6606 20 feet," "+ 5 v of resistance to more than 5 k, direct measurement of ground resistance short-circuit IC6606 20 feet. iucservice manual download site
 iucservice manual download site
Other pick open power supply IC of legs again good welding, disconnect IC6606 20 feet, only the + 5 v "earth resistance value is normal, determine IC6606 is damaged. After replacing IC6606 installed will SC to electricity, everything was normal.iucservice manual download site