SprintScan 35LE Service Manual
Troubleshooting
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3 - Troubleshooting
Scanner failures can be divided into three major categories: electrical, optical and
mechanical. Here are the functional inspection steps:
•
Power up the scanner/host system.
•
Wait for the scanner’s READY indicator to light up steadily.
•
Establish communication between scanner and host.
•
Inspect scan quality.
Electrical Problems
Figure 3-1 shows a simplified block diagram indicating the types of electrical
problems that may cause the scanner to malfunction. The troubleshooting guide in
Table 3-1 lists and describes each electrical problem that may cause the scanner to
malfunction. Table 3-1 also indicates the recommended corrective action that should
be taken to repair the scanner.
Figure 3-1. Simplified troubleshooting diagram
Power Failure?
Power Problems
Lamp On?
"Scanner Not Ready"
Lamp & AC Inverter
Filter OK?
"Scanner Not Ready"
Filter Failure.
CCD Module?
"Scanner Not Ready"
CCD Module Failure
Scanning Failure?
SCSI Failure
A
Stepping Motor OK ?
A
Stepping Motor Failure
