4 MX 800 SERIES TROUBLESHOOTING GUIDE
Check the
encryption keys
1 Press the SECURITY icon.
2 Press the KEY STATUS icon.
3 Press the right arrow to go to the second diagnostics screen.
4 The first screen will show MK (Master Key) status.
• If you are using Master Keys, there should be an indication that one or
more are loaded.
• If you are not using Master Keys, “No Key” will be displayed for each of the
ten Master Key slots.
5 Touch the screen or press Enter to go to the DUKPT key status screen.
• If you are using DUKPT keys, there should be an indication that one or
more are loaded.
• If you are not using DUKPT keys, “No Key” will be displayed for each of
the three DUKPT key engines (See chapter 2).
6 If “No Key” is shown for all master key slots and all DUKPT engines, there
was probably a security event that caused the terminal to erase all keys and
applications. Send the terminal in for repair.
Communications
Port Does Not
Work
The following are the corrective steps to be taken if a communications port does
not work.
1 Check whether the device connected to the port of the multiport cable of the
MX 800 Series terminal has power and is functioning correctly. If possible,
perform a self-test on the device.
2 The cable connecting the optional device to the MX 800 Series terminal’s
communications port may be defective. Try a different communications cable.
3 If the problem persists, contact your local VeriFone representative or service
provider for assistance.
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