LASER CLASS 730i/720i/710 Chapter 4: Maintenance and Service
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E100 Scanner unit failure
Cause: (1) Poor contact in the laser/scanner unit connectors
(2) Defective laser/scanner unit
(3) Poor contact in the ECU board connectors
(4) Defective ECU board
Solutions: (1) Reconnect the BD board connerctor (J871), laser driver board
(J801), and scanner motor connector (J851).
(2) Replace the laser/scanner unit
(3) Reconnect the ECU board connectors J913 and J914 correctly.
(4) Replace the ECU board.
E246 The Counter board is left out
Cause: The Counter board was left out when the SCNT board was replaced.
Solutions: Fit the Counter board from the existing SCNT board to the new SCNT
board.
E676 Communication error
Cause: A communication error occurred between the host machine and the
printer board.
Solutions: (1) Restart the printer.
(2) If the error persists, replace the printer board.
(3) If the error persists, replace the SCNT board.
E677/6F-61 ROM check error
Cause: An internal ROM check error occurred.
Solutions: (1) Restart the printer.
(2) If the error persists, replace the printer board.
E677/6F-63 RAM error
Cause: An internal RAM check error occurred.
Solutions: (1) Restart the printer.
(2) If the error persists, replace the printer board.
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