Normal playback, indicating the various parts of the aircraft normal operation of the circuit. If a box is inserted to prevent accidental erasure block tongue intact cassette, press record an alarm sound, the key to the machine, the state machine can not enter the record, you should first check on the operation panel Kara OK switch position is set correctly, the records state, the switch should be set in the "OFF" position. If set correctly, press the record button to record the state of the machine still can not enter, then you should check the system control microprocessor IC6001 3 feet (S.TAB) control level is normal, the normal state when the recording should be low 0.2V If not for the low 0.2V, check D6013, QR6023, D6022 is damaged, connectors P6001, P1504 and P6005 contact is good, Kara OK switch absence Weld.NNgservice manual download site