Toshiba e-STUDIO556 Service Manual page 672

[CBE0] Paper folding motor abnormality
Is the paper folding motor clock sensor (PI4S) working normally?
NO 

YES
Is the paper folding home position sensor (PI21S) working normally?
NO 

YES
Is the paper folding motor (M2S) operating at the fixed timing?
YES  Replace the saddle stitcher controller PC board.

NO
Is the paper folding roller drive mechanism normal?
NO 

YES
Is the problem solved by replacing the paper folding motor (M2S)?
NO 

YES
END
[CBF0] Paper positioning plate motor abnormality
Is the paper positioning plate home position sensor (PI7S) working normally?
NO 

YES
Is the paper positioning plate operating at the fixed timing?
YES  Replace the saddle stitcher controller PC board.

NO
Is the paper positioning plate drive mechanism normal?
NO 

YES
Is the problem solved by replacing the paper positioning plate motor (M4S)?
NO 

YES
END
e-STUDIO556/656/756/856/557/657/757/857
ERROR CODE AND TROUBLESHOOTING
Replace the sensor.
Replace the sensor.
Fix the mechanism.
Replace the saddle stitcher controller PC board.
Replace the sensor.
Fix the mechanism.
Replace the saddle stitcher controller PC board.
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