Lenovo ThinkPad Edge E30 Hardware Maintenance Manual page 58

Table 2. Numeric error codes (continued)
Symptom or error (beeps, if any)
02F7
Fail-safe timer NMI failed
(two short beeps)
1802
Unauthorized network card is plugged in—Turn off and
remove the miniPCI network card.
(two short beeps)
1804
Unauthorized WAN card is plugged in—Power off and
remove the WAN card.
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ThinkPad Edge 13², E30, and E31 Hardware Maintenance Manual
FRU or action, in sequence
1. DIMM.
2. System board.
1. Remove the Mini PCI network card.
2. System board.
1. Remove the wireless WAN card.
2. System board.