Sony Betacam SX DNW-A100 Maintenance Manual page 154

4-2. TAPE Maintenance Mode (M0)
4-2-2. SERVO CHECK Mode (C0)
C012 : THREADING MOTOR
This menu checks the functions of a threading motor and threading end sensor/
unthreading end sensor.
(1) Turn the search dial (JOG mode) slowly in FORWARD (2) direction.
. Confirm that the threading motor rotates and that the threading ring rotates
counterclockwise (3) and stops in the threading end state.
. Confirm that the superimpose picture display changes as described below.
UNTHREAD END 8 ........... 8 THREAD END
n
The threading motor also stops when the rotation of the search dial stops.
(2) Turn the search dial (JOG mode) slowly in REVERSE (3) direction.
. Confirm that the threading motor rotates and that the threading ring rotates
clockwise (2) and stops in the unthreading end state.
. Confirm that the superimpose picture display changes as described below.
THREAD END 8 ........... 8 UNTHREAD END
n
The threading motor also stops when the rotation of the search dial stops.
(3) To terminate the check, return to the unthreading end state and press the MENU
button.
n
Message "SET UNTHREAD END TO RETURN" is displayed if the threading
ring is not in the unthreading end state when the MENU button is pressed.
In case of NG
When the threading ring (threading motor) operation is defective
. Confirm that no mechanical abnormality exists.
. Check the threading motor drive circuit (on the DR-315 board).
. Check the threading motor.
When the superimpose picture does not display the threading end state or unthread-
ing end state even if the threading ring is in the threading end state or unthreading
end state
. Check the threading end sensor and unthreading end sensor (on the TR-79 board).
. Check the sensor input port of MPU (IC1 on the MS-50 board).
4-20
SERVO CHECK
MOTOR CHECK
C012:THREADING MOTOR
* * * * * *
UNTHREAD END
TURN JOG DIAL
IN JOG MODE
FWD:THREAD, REV:UNTH
DIAL
DIAL
(2)
(3)
SERVO CHECK
MOTOR CHECK
C012:THREADING MOTOR
...........
TURN JOG DIAL
IN JOG MODE
FWD:THREAD, REV:UNTH
DIAL DIAL
(2)
(3)
SERVO CHECK
MOTOR CHECK
C012:THREADING MOTOR
* * * * * *
THREAD END
TURN JOG DIAL
IN JOG MODE
FWD:THREAD, REV:UNTH
SERVO CHECK
MOTOR CHECK
C012:THREADING MOTOR
* * * * * *
THREAD END
# SET UNTHREAD END #
# TO RETURN #
TURN JOG DIAL
IN JOG MODE
FWD:THREAD, REV:UNTH
DNW-A100/A50/A45
DNW-A100P/A50P/A45P