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Service Hints & Tips

Document ID: GSMH-3D7DM8

This document is provided to IBM and our Business Partners to help sell and/or service IBM products. It is not to be distributed beyond that audience or used for any other purpose.

TP 3550 Expansion Unit - Related Service Procedures

Applicable to: World-Wide

Related Service Procedures:
This section provides related service information on the following:

¿Checking the Installed Devices List—

¿Automatic Configuration—

¿Missing SCSI Device—

¿Missing Non-SCSI device—

Checking the Installed Devices List:
At the start of the customer or advanced diagnostic tests, the installed devices list is displayed. Normally, all the adapters and devices that are installed are listed.
If the list contains an adapter or device that is not installed, go to ¿Undetermined Problem—.

If an adapter or device is missing from the list, you have one of the following conditions:
- The system partition on the computer hard disk drive (fixed disk drive) or the Reference Diskette you are using does not contain the code (contained on an option diskette) required to support the device. Copy the option diskette of the missing device to the system partition of the computer hard disk drive or to the Reference Diskette.
- The SCSI interface on the system board of the 3550 Expansion Unit might have failed.
- An unrecognizable device or adapter is installed.
- The device missing from the list requires an additional diskette. (See the device service manual.)
- The device missing from the list is defective.
- An adapter is defective.
- A power supply voltage is not correct (see ¿Power Systems Checkout—).

If the adapter is on the list, run the adapter diagnostic tests.

Automatic Configuration:
Warning:
A customized setup configuration (other than the default settings) might have been set on the computer you are servicing. Running Automatic Configuration might alter those settings. Note the current configuration settings (using the View configuration or Set and view SCSI device configuration option) and verify that the same settings are in place when service is completed.

Missing SCSI Device:
The 3550 Expansion Unit features a built-in SCSI controller.

The built-in SCSI controller supporting the missing device might be defective.
1. Power-off the 3550 Expansion Unit and disconnect all internal and external SCSI devices from the 3550 Expansion Unit.

Warning:
See ¿Automatic Configuration— before continuing.

2. Power-on the 3550 Expansion Unit and run Automatic Configuration.
If the built-in SCSI controller is not on the Installed Device List in advanced diagnostics, replace the system board of the 3550 Expansion Unit.
3. Reconnect the devices to the 3550 Expansion Unit.

Note:
The built-in SCSI controller includes an active terminator. This terminator automatically works when an external SCSI device is attached.

4. Go to ¿Undetermined Problem—.

Missing Non-SCSI device:

If a non-SCSI device is missing from the list, replace the missing device.

If more than one non-SCSI device is missing, isolate them one at a time until you find the device causing the failure.

	Search Keywords
	Hint Category	Hardware Maintenance Information
	Date Created	10-01-97
	Last Updated	07-04-98
	Revision Date	06-04-99
	Brand	IBM ThinkPad
	Product Family	ThinkPad Docking Stations
	Machine Type	3550
	Model	001
	TypeModel
	Retain Tip (if applicable)	N/A
	Reverse Doclinks and Admin Purposes