IBM ThinkPad X20 Hardware Maintenance Manual page 38

Notes:
v In the Keyboard test in Interactive tests, the Fn key is
scanned only once. Because of this, each key should be held
down for at least 2 seconds or it will not be sensed.
v The sound card is not recognized in the Stereo Speaker in the
Interactive Tests. To test it, use the audio device test in the
Other Devices (Diagnostics).
v Video Adapter test supports only the LCD display on
ThinkPad. Before running PC-Doctor DOS, detach the external
Monitor.
v To test ZIP Drive or LS-120 Drive, each media is needed to be
inserted before start testing.
v Wireless LAN test is only for some models. Some model do
not have them.
v To test Digital Signature Chip, the chip must be enabled and
initialized.
v When legacy Floppy Drives is Enabled in the BIOS Setup
Utility, Diskette Drives test is activated even if no diskette
drive is attached to the ThinkPad.
v There are 5 kinds of modem test in Other Devices test menu.
Please check first which modem device you want to test as
belows.
Lucent Modem (M2) Loopback
Lucent Modem (M2)
Dialtone/DTMF
Lucent Soft Modem Loopback
Lucent Soft Modem Dialtone
Intel Modem Register
Intel Modem Loopback/DTMF
Intel SP Modem Register
Intel SP Modem
Loopback/DTMF
3Com MiniPCI Modem Test
3Com MiniPCI Dialtone Test
4. Run the applicable function test.
5. Follow the instructions on the screen. If there is a
problem, PC-Doctor shows messages describing it.
6. To exit the test, select Quit-Exit Diag. To cancel the
test, press Esc.
Note: After executing PC-Doctor, check the system
time/date and reset them if needed.
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ThinkPad X20, X21, X22, X23, X24
Lucent Modem
Software Modem used in
Wireless Combo Card
Intel combo / Xircom Depop
Combo Card
Intel SP Combo Card
3Com Combo Card