Copy or scan-to-computer sequence of events ............................................................. 21 Fax functions and operation (fax models only) ........................................................................... 22 Computer and network security features ..................................................................... 22 PSTN operation ...................................................................................................... 22 Receive faxes when you hear fax tones ...................................................................... 22 Distinctive ring function ............................................................................................
23 Fax by using Voice over IP services ........................................................................... 23 The fax subsystem ................................................................................................... 24 Fax card in the fax subsystem ................................................................................... 24 Safety isolation ........................................................................................ 24 Safety-protection circuitry .......................................................................... 25 Data path ................................................................................................
25 Hook state ............................................................................................... 25 Downstream device detection .................................................................... 26 Hook switch control .................................................................................. 26 Ring detect .............................................................................................. 26 Line current control ................................................................................... 26 Billing- (metering-) tone filters .....................................................................
26 Fax page storage in flash memory ............................................................................ 26 Stored fax pages ...................................................................................... 27 Advantages of flash memory storage .......................................................... 27 USB Flash Drive ..................................................................................................................... 28 2 Solve problems ...............................................................................................................
29 Solve problems checklist ......................................................................................................... 30 Menu map ............................................................................................................................ 32 Troubleshooting process .......................................................................................................... 32 Pre-troubleshooting checklist ..................................................................................... 32 Power-on checks .....................................................................................................
34 Tools for troubleshooting ......................................................................................................... 35 Component diagnostics ............................................................................................ 35 LED diagnostics ........................................................................................ 35 Network LEDs ........................................................................... 35 Control panel LEDs .................................................................... 36 Control-panel diagnostics ..........................................................................
37 Engine Diagnostics ................................................................................... 37 Engine test ................................................................................ 37 Diagrams ............................................................................................................... 38 Plug/jack locations ................................................................................... 38 DC controller PCA .................................................................................... 39 Locations of major components .................................................................. 41 vi ENWW