Sony DSR-2000 Service Manual page 184

5-3. Contents of Maintenance Menu
5-3-2. Servo Check
2 TAPE TOP/END 2 2 2 2
Checks the tape-top and tape-end sensors.
Tape end sensor
(photodetector)
1. Execute the TAPE TOP/END.
2. Confirm that both TOP SENSOR and END SENSOR are
[ON!].
3. Interrupt between the LED for the tape sensor (light emitter)
and the tape-top sensor (photodetector) by inserting a finger or
the like.
Confirm that the TOP SENSOR display changes from [ON!]
to [OFF] on the monitor display.
4. Interrupt between the LED for the tape sensor (light emitter)
and the tape-end sensor (photodetector) by inserting a finger
or the like.
Confirm that the END SENSOR display changes from [ON!]
to [OFF] on the monitor display.
In the case of trouble :
If the display does not change check whether the tape-top sensor or
the tape-end sensor itself is defective.
Check also the tape-top/tape-end sensor circuit (MS-64, SE-521/
522 board).
5-10
LED for tape sensor
(light emitter)
Tape top sensor
(photodetector)
DSR-2000/2000P