Toshiba E-STUDIO4508A - 8.5.5 COVER OPEN continues to be displayed

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ERROR CODE AND TROUBLESHOOTING
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8.5.5 "COVER OPEN" continues to be displayed
Check Item Measure
Front cover • Confirm that both the front cover is closed.
• Confirm that the front cover interlock switch (SW2) is turned
ON properly when the front cover is closed.
Automatic Duplexing Unit (ADU) • Confirm that both the automatic duplexing unit (ADU) is
closed.
• Confirm that the ADU interlock switch (SW3) is turned ON
properly when the front cover is closed.
LGC board Replace the LGC board.
Switching regulator Replace the switching regulator.
Replacement part Remark
LGC board
Switching regulator