Ricoh FW780 Service Manual

B047/B048 ii SM
Recovery from Toner End Condition.....................................................2-5
Toner Density Sensor .......................................................................... *
2.4.5 DEVELOPMENT BIAS .................................................................... *
Basic Concept...................................................................................... *
Manual Image Density Bias ................................................................. *
2.4.6 TONER SUPPLY............................................................................. *
2.5 IMAGE TRANSFER AND PAPER SEPARATION.................................... *
2.5.1 PRE-TRANSFER LAMP (PTL) ........................................................ *
2.5.2 IMAGE TRANSFER......................................................................... *
2.5.3 PAPER SEPARATION .................................................................... *
2.5.4 PICK-OFF MECHANISM................................................................. *
2.5.5 T/S CORONA CIRCUIT................................................................... *
2.6 CLEANING ............................................................................................... *
2.6.1 OVERVIEW ..................................................................................... *
2.6.2 USED TONER COLLECTION ..........................................................2-6
2.7 QUENCHING............................................................................................ *
2.8 FUSING AND PAPER EXIT ......................................................................2-7
2.8.1 OVERVIEW ......................................................................................2-7
2.8.2 DRIVE MECHANISM....................................................................... *
Fusing Unit Drive ................................................................................. *
2.8.3 TEMPERATURE CONTROL ............................................................2-8
Fusing Circuit Operation ...................................................................... *
Overheat Protection............................................................................. *
Hot Roller Temperature Control............................................................2-8
2.8.4 TEMPERATURE CONTROL ........................................................... *
The Ready Condition........................................................................... *
Fusing Unit Operating Modes .............................................................. *
2.8.5 ENERGY SAVER FUNCTION......................................................... *
2.8.6 FUSING ENTRANCE GUIDE HEIGHT............................................ *
2.9 OTHERS .................................................................................................. *
2.9.1 ROLL CUTTING RAIL ..................................................................... *
2.10 ENERGY STAR COMPLIANT MACHINES
(ALL THE DESTINATION) ......................................................................2-9
INSTALLATION
3. INSTALLATION ........................................................................... 3-1
3.1 INSTALLATION REQUIREMENTS ...........................................................3-1
3.1.1 ENVIRONMENT ...............................................................................3-1
3.1.2 MINIMUM SPACE REQUIREMENTS...............................................3-2
3.1.3 MACHINE LEVEL.............................................................................3-2
3.1.4 POWER SOURCE............................................................................3-3
3.2 INSTALLATION PROCEDURE .................................................................3-4
3.2.1 COPIER............................................................................................3-4
Accessory Check ..................................................................................3-4
B048 copier only (step 21)..................................................................3-12
B047 copier only (step 22 and 23) ......................................................3-12

Ricoh FW780 Specifications

General

Brand	Ricoh
Model	FW780
Category	Printer
Language	English