3550 Errors
Slot IDs for 3550 during testing
Serial and Parallel Port Testing
Status Inducator Testing
SCSI Devices Fail or Stop Diagnostics
Numeric Error Codes 
Miscellaneous Symptoms
New Cover Kit

3550 Slot  IDs
   The following table describes the slot information displayed on the screen. This information is also displayed during the test of the 3550 Expansion Unit when the test is successfully completed. “n” can be any number greater than “2.”
Slot Number
Identified Device
n
IBM 3550 Expansion Unit
n+1
Built-in SCSI
n+2
Upper slot
n+3
Lower slot

Serial and Parallel Port Testing
   Because the serial and parallel ports on the computer are covered by the 3550 Expansion Unit when the computer is installed on the 3550 Expansion Unit, answer “No” when you are asked if a wrap plug is used.

Status Indicator Testing
   Test the status indicators on the 3550 Expansion Unit by using the system status indicator test of the computer. The corresponding indicators on the 3550 Expansion Unit turn on and off in the test, except for the power-on indicator. This power-on indicator does not turn off due to hardware restriction.

SCSI devices fail or stop diagnostics
   If the following SCSI devices fail or stop diagnostics, suspect that the diagnostic programs are down level before replacing SCSI devices.
   o SCSI Tape Drive (error code = 0211XXXX)
   o SCSI CD-ROM Drive (error code = 0215XXXX)
   o SCSI Rewritable Optical Drive (error code = 0217XXXX)
To continue the diagnostics of other devices, remove these SCSI devices from the installed device list before starting diagnostics.

Numeric Error Codes
IMPORTANT:
1. Before replacing any SCSI devices, verify that there are no duplicate SCSI ID settings.
2. If you have both an error message and an incorrect audio response, diagnose the error message first.
3. If you can't run the adv. diags, but received a POST error, diagnose the POST error 
4. If you didn't receive an error message, look for a description error symptoms in the first part of this index.
5. Check all power supply voltages before you replace the system board of the 3550 Expansion Unit. (See “Power Systems Checkout” )
6. If an error message is not listed, there is a device installed that requires an additional diskette or service manual. Refer to the diskette or the service manual for that device.
 
Symptom/Error FRU/Action
000113XX 1. Any Adapter 
2. System Board of 3550 
3. Any Drive
000114XX  1. Any Adapter
00016300, 00016400, 00016500 
(If setting configuration does not solve the problem Check the Installed Devices)		 1. Set Configuration/Features
2. System Board of 3550
000166XX 1. Any Adapter
00017400 
(If AutoConfig does not solve problem run Adv. Diags.)		 1.Set Configuration/Features 
2. Any Device 
3. System Board of 3550
0001XXXX (not listed above) 1. System Board of 3550 
2. Any Adapter
00030700 1. External Keyboard 
2. Keyboard Cable
00030X00 (not listed above) 1. Keyboard 
2. System Board of 3550 
3. Keyboard Cable
000401XX 1. System Board of 3550
00110200, 00110600 1. System Board of 3550 
2. Any Serial Device
00110700 1. Communication Cable 
2. System Board of 3550
0011XX00  (not listed above) 
Check power supply voltages before replacing 3550 system board ( “Power Systems Checkout”)		 1. System Board of 3550
00120700 1. Communication Cable 
2. Dual Async Adapter/A
0012XX00 (not listed above) 1. Dual Async Adapter/A 
2. System Board of 3550 
3. Any Serial Device
0014XX00 
(See Printer Checkout before replacing FRUs.) 		 1. Printer
2. System Board of 3550
00186XXX  1. Set Configuration/ Features 
2. Backup Battery
0018XXXX (not listed above) 1. System Board of 3550
00240100 
(See Ext. Display Self-Test  before replacing FRUs)		 1. External Display 
2. System Board
00241000 1. System Board of 3550 
00860100, 00860200 1. Pointing Device 
2. System Board of 3550
00860300 1. System Board of 3550 
00860400 1. System Board of 3550 
2. Pointing Device (Mouse)
0106XXXX  1. Ethernet Network Adapter/A 
2. System Board of 3550
0137XXXX 1. System Board of 3550
016500XX 1. 6157 Tape Attachment Adapter
016520XX 1. 6157 Streaming Tape Drive
016540XX 1. 6157 Streaming Tape Drive 
2. 6157 Tape Attachment Adapter
0166XXXX 0167XXXX 1. Token-Ring Network Adapter/A 
2. System Board of 3550
0210XXXX The last X is drive capacity 
A (60MB)
B (80MB)
C (120MB)
D (160MB)
E (320MB)
F (400MB)
G (40MB)
H (1GB)
I (108MB)
J (216MB)
U (Size undetermined) 
(If failing device is external, go to the external devices' service pamphlet.)		 1. SCSI Hard Disk Drive 
2. System Board of 3550 
3. SCSI Adapter (if used) 
4. SCSI Cable
0211XXXX 
(If failing device is external, go to the external devices' service pamphlet.)		 1. SCSI Tape Drive 
2. System Board of 3550
3. SCSI Adapter (if used) 
4. SCSI Cable
0215XXXX 
(If failing device is external, go to the external devices' service pamphlet.)		 1. SCSI CD-ROM Drive 
2. System Board of 3550
3. SCSI Adapter (if used) 
4. SCSI Cable
0217XXXX 
(If failing device is external, go to the external devices' service pamphlet.)		 1. SCSI Rewritable Optical Drive 
2. System Board of 3550 
3. SCSI Adapter (if used) 
4. SCSI Cable
0260XXXX 1. System Board of 3550 
2. Any SCSI Device
I998009X 1. Restore System Partition

Miscellaneous Symptoms
Symptom/Error FRU/Action
Program-load error during remote IPL from file service. Displayed on upper or lower half of  LCD 1. Network Adapter
External display screen changes colors. 1. External Display 
2. Docking Frame
One or more keys don't work on the external keyboard but 3550 is otherwise functional.  (See External KB/Auxiliary InputDevice Checkout) 1. External Keyboard 
2. Keyboard Cable 
3. System Board of 3550
Power-good light does not turn on and fan runs 1. System Board of 3550
2. Power Supply
Power-good light does not turn on, fan does not run and 3550 is not functional.
(See “Undetermined Problem)		 1. Power Supply 
2. System Board of 3550
Expansion Unit Intermittent Failures. 
(See “Undetermined Problem)		 1. Power Supply 
2. System Board of 3550 
3. Any Device or Adapter
3550 cannot be powered-off. 1. System Board of 3550 
2. Power Supply
LED for hard disk drive stays on. 1. SCSI Hard Disk Drive 
2. System Board of 3550 
Expansion Unit LED for hard drive is not working but the 3550 is completely functional. 1. System Board of 3550

New Cover Kit
   If the docking station serial number is below 97-C0001, and the computer has intermittent problems that seem to go away when the computer is reseated in the docking station, install the cover kit (part number 66G9433).
Note:  To check if the cover kit has already been installed, look at the plug toward the left side of the docking station (this plug connects to the AC adapter port at the left-rear of the computer). If the plug has a one-eighth inch deep shoulder, the cover kit has already been
installed. If the plug has a one-quarter inch deep shoulder, the cover kit has not yet been installed.

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