Intermittent Problems; Undetermined Problems - Lenovo ThinkPad X1 Hardware Maintenance Manual

Table 2. Error codes (continued)
Symptom or error
1802
Unauthorized network card is plugged in—Turn off and
remove the network card.
1820
More than one external fingerprint reader is attached.
Power off and remove all but the reader that you set up
within your main operating system.
2101
Detection error on SSD1 (M.2)
2111
Read error on SSD1 (M.2)
2200
Machine Type and Serial Number are invalid.
2201
Machine UUID is invalid.
Message: Thermal sensing error
Message: Error: The System UEFI Variable Storage is
nearly full.
Note:
This error indicates that the operating system or
applications cannot create, modify, or delete data in
the non-volatile system UEFI variable storage due to
insufficient storage space after POST.
The non-volatile system UEFI variable storage is used
by the UEFI BIOS and by the operating system or
applications. This error occurs when the operating system
or applications store large amounts of data in the variable
storage. All data needed for POST, such as BIOS setup
settings, chipset or platform configuration data, are stored
in a separate UEFI variable storage.

Intermittent problems

Intermittent system hang problems can be due to a variety of causes that have nothing to do with a hardware
defect, such as cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be
considered only when a problem recurs.
When analyzing an intermittent problem, do the following:
1. Run the diagnostic test for the system board in loop mode at least 10 times.
2. If no error is detected, do not replace any FRUs.
3. If any error is detected, replace the FRU shown by the FRU code. Rerun the test to verify that no
more errors exist.

Undetermined problems

If the diagnostic tests did not identify the adapter or device that has failed, if wrong devices are installed,
or if the system simply is not operating, follow these procedures to isolate the failing FRU (do not isolate
FRUs that have no defects).
FRU or action, in sequence
The wireless network card is not supported on this tablet.
Remove it.
Power off and remove all but the reader that you set up
within your main operating system.
The M.2 SSD device is not working. Have the M.2 SSD
device serviced.
The M.2 SSD device is not working. Have the M.2 SSD
device serviced.
Machine Type and Serial Number are invalid. Have the
tablet serviced.
Machine UUID is invalid. Have the tablet serviced.
The thermal sensor has problem. Shut down the tablet
immediately and have the tablet serviced.
Enter ThinkPad Tablet Setup after the error message is
displayed. A dialog asks the user for confirmation to
clean up the storage. If the user selects Yes, all data that
were created by the operating system or applications are
deleted except global variables defined by the Unified
Extensible Firmware Interface Specification. If the user
selects No, all data is kept, but the operating system or
applications will not be able to create, modify, or delete
data in the storage.
If this error happens at a service center, Lenovo authorized
service personnel will clean up the non-volatile system
UEFI variable storage using the above solution.
Chapter 4
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Related service information
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