The fax subsystem ............................................................................................................................ 35 Fax by using Voice over IP services ................................................................................................... 34 Fax card in the fax subsystem .......................................................................................................... 35 Safety isolation ............................................................................................................... 35 Safety-protection circuitry .............................................................................................
35 Data path ......................................................................................................................... 35 Hook state ....................................................................................................................... 36 Downstream current detection ...................................................................................... 36 Hook switch control ........................................................................................................ 36 Ring detect ......................................................................................................................
36 Billing- (metering-) tone filters ...................................................................................... 37 Line current control ........................................................................................................ 36 Fax page storage in flash memory ................................................................................................... 37 Stored fax pages ............................................................................................................. 37 Advantages of flash memory storage ............................................................................
37 USB flash drive ..................................................................................................................................................... 38 2 Solve problems ........................................................................................................................................... 39 Solve problems checklist ..................................................................................................................................... 40 Menu structure ....................................................................................................................................................
42 Configuration report ............................................................................................................................................ 43 Troubleshooting process .................................................................................................................................... 44 Determine the problem source ......................................................................................................... 44 Power subsystem ..............................................................................................................................
45 Power-on checks ............................................................................................................ 45 Tools for troubleshooting ................................................................................................................................... 46 Control-panel checks ........................................................................................................................ 45 Individual component diagnostics .................................................................................................... 46 Tools for troubleshooting: LED diagnostics ...................................................................
46 Network LEDs ............................................................................................... 46 Tools for troubleshooting: Engine diagnostics .............................................................. 47 Control panel LEDs ....................................................................................... 46 Engine-test button ....................................................................................... 47 Drum rotational check ................................................................................. 47 Half self-test functional check .....................................................................
48 Diagrams ........................................................................................................................................... 49 Diagrams: Formatter connections .................................................................................. 49 Diagrams: Location of major components ..................................................................... 50 Major components ........................................................................................ 50 Motors and fans ............................................................................................
52 Rollers ........................................................................................................... 53 ENWW vii