Sony BVW-55 Maintenance Manual page 85

C002 : TOP/END SENSOR
This submenu checks the functions of a tape top sensor, tape end sensor and full top
sensor.
(1) Bring a metallic screwdriver near each sensor.
. Confirm that the characters below the corresponding sensor change from
"OFF" to "ON!".
c
Never bring the screwdriver into contact with each sensor.
(2) Keep the screwdriver away from each sensor.
. Confirm that the characters below the corresponding sensor return from
"ON!" to "OFF".
(3) Press the MENU button when terminating the check.
In case of NG
. Check each sensor itself.
. Check the oscillator and detection circuit (IC407 on the SV-206 board) for
sensors.
. Check the sensor input port of MPU (IC113 on the SV-206 board).
Tape end sensor
BVW-55
Locations of Tape Top and Tape End Sensors
3-2. TAPE Maintenance Mode (M0)
3-2-2. SERVO CHECK Mode (C0)
INPUT CHECK
C002:TOP/END SENSOR
END FULL TOP TOP
SENSOR SENSOR SENSOR
OFF OFF OFF
(Ex.)
INPUT CHECK
C002:TOP/END SENSOR
END FULL TOP TOP
SENSOR SENSOR SENSOR
OFF OFF ON!
Tape top sensor
Full top sensor
3-13