Airlink APSUSB1 - Manual (Page 12)

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USB LED Pattern Error Type
Flash slowly Firmware reload required
Steady on DRAM error
1 long - 2 short Timer INT error
1 long - 3 short Flash protected
1 long - 5 short Flash erase/program error
1 long - 6 short LAN controller error
1 long - 7 short LAN memory error
1 long - 11 short LAN I/O base error
1 long - 18 short USB controller error
In the event of a ‘Firmware Reload Required’ error at startup, proceed
according to instructions given in the PS Admin User’s Guide ("PS Admin
Administration" section, under the heading "Upgrading the Print Server's
Internal Firmware").
In the event that any of the other listed error conditions is encountered on
startup, contact your dealer for correction of the fault.