Preface - Canon EF-9 Service Manual

I. PREFACE
A. Malfunction Diagnostic Flowchart
The malfunctions that occur in this envelope feeder are broadly classified in to 4 factors: "Paper
jams", "paper transport troubleshooting", "malfunction troubleshooting" and " malfunction sta-
tus troubleshooting."
If malfunction occurred in the envelope feeder, the service technician is to find the factor of
the malfunction according to the flowchart and to redress the problem following the action pro-
cedures described in this chapter.
Make sure the following points at the execution of troubleshooting.
Be sure that the connector has no poor contact when measuring the voltage at the specified ter-
minal of the connector.
Before handling PCBs, be sure to touch metal part of the printer to discharge static electricity,
as it can cause damage to the PCBs.
In some cases, the cause of malfunction cannot be distinguished between the printer and the
video controller. Therefore, in this chapter, it is assumed that the video controller installed in
the printer is normal.
CHAPTER 4
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