Toshiba e-STUDIO556 Service Manual page 110

8.3.12 Laser optical unit related service call
[CA10] Polygonal motor abnormality
Is the polygonal motor rotating?
NO 
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(e-STUDIO556/656)
1. Check if the connector CN209 on the PLG board is disconnected.
2. Check if the harness is open circuited and the connector pin is
disconnected.
3. Check if the following signals are transmitted on the pins of the
connector CN209 on the PLG board.
Pin 1: 27±1V, Pin 2: GND, Pin 5: Less than or equal to 1V (Lo),
Pin 4: Less than or equal to 0.7 V (Lo), Pin 3: Do not touch.
4. Check if the conductor pattern on the PLG board is short circuited or
open circuited.
5. Replace the laser optical unit.
6. Replace the PLG board.
(e-STUDIO756/856)
1. Check if the connector CN206 on the PLG board is disconnected.
2. Check if the harness is open circuited and the connector pin is
disconnected.
3. Check if the following signals are transmitted on the pins of the
connector CN206 on the PLG board.
Pin 5: 24±1V, Pin 4: GND, Pin 3: Less than or equal to 1V (Lo),
Pin 2: Less than or equal to 0.7 V (Lo), Pin 1: Do not touch.
4. Check if the conductor pattern on the PLG board is short circuited or
open circuited.
5. Replace the laser optical unit.
6. Replace the PLG board.
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ERROR CODE AND TROUBLESHOOTING
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