According to the number of lights flashing, fault in the PA plate or H. nV2service manual download site
PA board protection, the normal work of the machine, as Q5642, D5646 cut-off, PA - SOS at a low level. As some reason make Q5642 conduction, PA - SOS into high level, machine protection, lights flashing under 10. The PA plate the other part of the protection circuit and H protection circuit is the same. nV2service manual download site
In order to distinguish the fault in the PA plate, or on H board, boot instantaneous Q5624 and Q3008 state respectively. Has found that, measured on instant Q3008 conduction, collector has a 5 v voltage output, SOS into high level (3 v), machine protection. And remain the cut-off condition Q5624, specify on the H board. After measuring, no BT30V voltage cause machine protection. BT30V voltage is 9 v IC5603, Q56145, L5610, D5610 booster circuit. Measurement 9 v input is normal, IC5603 5 feet, no output. Check the peripheral components without exception, replacing IC5603, machine back to normal.nV2service manual download site