Checking Inside Your Computer 6-3
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In general, modem malfunctions may be caused by any of the following problems:
Incorrectly installed modem
Interrupt request (IRQ) conflicts
Incorrect information (.inf) files
Multiple drivers installed
Incorrect Plug and Play configuration
To troubleshoot a modem card, follow these steps:
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Refer to “Resolving Software and Hardware Incompatibilities” in Chapter 5.
Resolve any modem IRQ conflicts and restart the system.
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a. Click the Start button, point to Settings, and click Control Panel.
b. Double-click Modems in the Control Panel. Remove any invalid or unused
entries from the list. If you are using Windows NT, check the modem proper-
ties and then proceed to step 3.
c. Click the Diagnostics tab.
d. Highlight the COM port that the modem is using .
e. Click More Info to verify that the sys tem c an co mmuni cate with t he mod em.
If the modem reports information to the system, the modem is operating
properly.
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NOTE: Windows NT does not support Plug and Play ISA devices. Jumpers are

used to manually configure the modem for a specific COM port and IRQ.

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