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c) C012: THREADING MOTOR
This mode checks the rotation of the threading motor, and the functions of the
thread end sensor and unthread end sensor.
Turn the threading motor using a search dial (JOG mode). As a result, the thread
ring moves as shown in the table below.
Dial
Movement of the threading ring
FWD
Threading
REV
Unthreading
Confirm that the display on the monitor screen changes as shown below.
UNTHREAD END
In case of NG;
When the threading motor does not rotate.
Check the threading motor and the FG sensor on the PTC-59 board.
Also check the threading motor driver circuit (DR-200 board) and the
threading FG amplifier circuit (DR-200 board).
When the display remains "..........." with the unit set to the thread end/unthread
end state.
Check the thread end sensor and unthread end sensor on the TR-79 board.
Threading FG sensor
(on PTC-54 board)
FWD
FWD
............
REV
REV
Threading Motor Check
Threading motor
THREAD END
Threading ring
5-2. Servo/DT System Check Mode
SERVO CHECK
MOTOR CHECK
C012:THREADING MOTOR
*** UNTHREAD END ***
TURN JOG DIAL
IN JOG MODE
FWD:THREAD, REV:UNTH
S301(SS-52): RETURN
Unthread end sensor
(on TR-79 board)
Thread end sensor
(on TR-79 board)
(Unthreading end state)
5-19
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