Sony GY-8240UWD Maintenance Manual page 240

5-4. DIAG Mode
c. R1-TAPE TOP/END Sensor and Dew Sensor Check
Function: Displays the states of the tape top sensor, tape end sensor and dew sensor.
Refer to the next page on the position of each sensor.
Operation:
(1) Without loading any cassette, enter "R1"". The following will be displayed.
SV1_TOP=>R1"
[TTop-][TEnd-][Dew-][Unth-][Thre*][SftL*][SftS-]
0000 0000 0000
The following indicates the current status of the respective sensors.
When the sensor is functioning, the display changes from "_" to "*".
[Ttop-]: Tape Top sensor
[TEnd-]: Tape End sensor
[Dew-]: Dew sensor
[Unth-]: Unthread End sensor
[Thre-]: Thread End sensor
[SftL-]: Reel L Position sensor
[SftS-]: Reel S Position sensor
(2) Check the following.
1 When a screwdriver is moved near only the tape top sensor, the display changes from "[Ttop-]" to
"[TTop*]".
2 When a screwdriver is moved near only the tape end sensor, the display changes from "[TEnd-]" to
"[TEnd*]".
3 Using a cotton swab moistened with water, touch the dew sensor gently. After 10 seconds, the
display changes from "[Dew-]" to "[Dew*]".
After checking, wipe the dew sensor completely dry of water.
After wiping completely, turn on the power again.
If the above fails:
. Check the sensor.
. Check the sensor harness.
. Check the sensor input port of the CPU on the SV-205 board.
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GY-8240UWD
GY-8240FC