Built-In Self-Diagnostic Functions - Canon BJC-55 Service Bulletin

Part 1: Safety and Precautions
BJC-50
When replacing the IrDA unit, be careful not to touch the light emitting and receiving
parts. (Touching these parts may offset the optical axis or soil the lens and possibly
inhibit infrared communication.)
IrDA unit
Figure 1-12 IrDA Unit

3.4 Built-in Self-diagnostic Functions

The printer has built-in self-diagnostic functions to judge hardware defects. The
results of self-diagnosis are indicated by the indicators and the beeper. For details, see
Part 3: 3.1 Error Indications (page 3-12).
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