HP LaserJet 3390 - Unpack and Identify Components

PCL 5e................................................................................................................79
PostScript............................................................................................................79
Network settings..................................................................................................................79
Using Macintosh Configure Device (Mac OS X V10.3 and Mac OS X V10.4).....................................80
Understanding the Embedded Web server..........................................................................................81
Features...............................................................................................................................81
4 Theory of operation
Basic operation.....................................................................................................................................84
Sequence of operation for the base unit..............................................................................84
Internal components (base unit)...........................................................................................................86
Engine control system..........................................................................................................................88
Laser/scanner system..........................................................................................................................90
Pickup/feed/delivery system.................................................................................................................91
Image-formation system.......................................................................................................................93
Scanner and ADF functions and operation..........................................................................................97
Scanner functions ...............................................................................................................97
Scanner operation...............................................................................................................97
ADF operation......................................................................................................................98
ADF paper path and ADF sensors.......................................................................................98
ADF jam detection...............................................................................................................99
Fax functions and operation...............................................................................................................100
PSTN operation.................................................................................................................100
To receive faxes when you hear fax tones........................................................................100
Distinctive ring function......................................................................................................100
The fax subsystem.............................................................................................................101
Formatter in the fax subsystem.........................................................................................101
LIU in the fax subsystem...................................................................................................101
Safety isolation..................................................................................................102
Safety-protection circuitry..................................................................................102
Data path...........................................................................................................102
Hook state.........................................................................................................103
Downstream current detection..........................................................................103
Hook switch control...........................................................................................103
Ring detect........................................................................................................103
Line current control...........................................................................................103
Billing (metering) tone filters..............................................................................104
Fax page storage in flash memory....................................................................................104
Stored fax pages...............................................................................................104
Advantages of flash memory storage ...............................................................104
5 Removal and replacement
Introduction.........................................................................................................................................108
Removal and replacement strategy ..................................................................................108
Electrostatic discharge.......................................................................................................108
User-replaceable parts......................................................................................................109
Required tools ...................................................................................................................109
Before performing service..................................................................................................109
After performing service.....................................................................................................109
Post-service tests..............................................................................................................110
ENWW vii
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