IBM 220, Service Manual

Page: 36 / 68

Step 7: SCSI Address Switch
This step checks that the SCSI address switch setting is correct.
Is the SCSI address set correctly?
NO Set the SCSI address switch to the proper address, then go to Step 12:
External SCSI Cable Connection. To set the SCSI address switch, refer to
the instructions in Chapter 2, “Setting Up the 7206 Tape Drive,” in the 7206
Model 220 4mm Tape Drive Setup and Operator Guide.
Note: You should turn the power to the 7206 Tape Drive off and then back
on again to ensure the SCSI address setting is recognized.
YES Go to Step 8: SCSI Address Cable.
Step 8: SCSI Address Cable
This step checks whether the SCSI address switch is plugged into the drive.
1. Do a controlled system shutdown (refer to the instructions in Chapter 2,
“Setting Up the 7206 Tape Drive,” in the 7206 Model 220 4mm Tape Drive Setup
and Operator Guide).
2. Perform the cover removal procedure. Refer to “Removing and Replacing the
Cover” on page 28.
DANGER
To prevent a possible electrical shock from touching two surfaces with
different electrical grounds, use one hand, when possible, to connect or
disconnect signal cables. (RSFTD004)
Is the SCSI address switch plugged securely into the drive?
NO Ensure that the SCSI address switch is plugged securely into the drive,
then go to Step 11: Reassembly.
YES Go to Step 9: Tape Drive Status Lights.
Step 9: Tape Drive Status Lights
This step examines the drive as the possible source of the problem.
While pressing the power switch to turn on the power, watch to see if the three
status lights come on for approximately 10 seconds, then go out.
Did the three status lights come on for approximately 10 seconds, then go out?
NO Go to Step 10: Power Supply Voltage Level.
YES Go to Step 11: Reassembly.
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7206 Model 220 Service Guide
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