Main spindle turn, tape is not running, focusing on main shaft driving circuit, found the main shaft drive power IC1002 (UN102) 11 feet only 1.4 V voltage. Disconnect plastic triode type insurance tube BX1008 (N25) after the test, the foot back to 4 v voltage. For insurance tube not burn out, the main shaft drive circuit and peripheral components hard short circuit. Suspected of main shaft driving circuit IC2005 (BA6430S) with local damage, replace IC2005 tape after operation, machine back to normal.hsAservice manual download site