Canon Oce BLM550+ Operation Manual page 75

Is there damage to the spine at the stitch positions or is the cover falling off?
No
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V
Print a sample to the printer stacker and inspect the pages.
Is the printer the cause of the damage?
No
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V
Call your service engineer.
Yes
Run a standard job using paper of 80 g/m² (20 lb bond).
Does the problem persist?
Yes
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V
Call your service engineer.
Yes
Printer service is required.
Chapter 6 - Error Conditions, Problems and Solutions
Book Quality
No
The problem is caused by the
cover material or the finish.
Change the cover material.
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