HP M276 - Page 8

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
Networ
k 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