Sony Betacam SX DNW-A100 Maintenance Manual page 160

4-2. TAPE Maintenance Mode (M0)
4-2-2. SERVO CHECK Mode (C0)
C016 : REEL SHIFT MOTOR
This menu checks the functions of a reel shift motor and reel position sensor.
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The power supply to the motor stops to protect the motor and movable part when the
driving time of a motor continuously exceeds about six seconds due to abnormality.
(1) Press the SET button when S-POSITION is displayed.
. Confirm that the reel shift motor rotates and that the reel table moves from the
S position (S cassette position) to the L position (L cassette position).
. Confirm that the superimpose picture display changes as described below.
S-POSITION 8 ........... 8 L-POSITION
(2) Press the SET button when L-POSITION is displayed.
. Confirm that the reel shift motor rotates and that the reel table moves from L
position (L cassette position) to the S position (S cassette position).
. Confirm that the superimpose picture display changes as described below.
L-POSITION 8 ........... 8 S-POSITION
(3) Press the MENU button when terminating the check.
In case of NG
When the reel table (reel shift motor) operation is defective
. Confirm that no mechanical abnormality exists.
. Check the drive circuit of the reel shift motor (on the DR-315 board).
. Check the reel shift motor.
When the superimpose picture does not display the S or L position state even if the
reel table is in the S position (S cassette position) or L position (L cassette position)
. Check the S and L position sensors (on the PTC-71 board).
. Check the sensor input port of MPU (IC1 on the MS-50 board).
4-26
S reel table
L position sensor S position sensor
Locations of S and L Position Sensors and Reel Shift Motor
SERVO CHECK
MOTOR CHECK
C016:REEL SHIFT MOTOR
S-POSITION
SERVO CHECK
MOTOR CHECK
C016:REEL SHIFT MOTOR
...........
SERVO CHECK
MOTOR CHECK
C016:REEL SHIFT MOTOR
L-POSITION
T reel table
(S cassette position state)
Reel shift motor
[SET]
DNW-A100/A50/A45
DNW-A100P/A50P/A45P