Ricoh FW780 Service Manual

SM i B047/B048
B047/B048
TABLE OF CONTENTS
This manual describes new items for the J2SS-C3 (B047/B048).
Please refer to the J2SS Mark II (A251/A252) manual for the descriptions marked
with “*” in page column.
OVERALL INFORMATION
1. OVERALL MACHINE INFORMATION........................................ 1-1
1.1 SPECIFICATIONS.....................................................................................1-1
1.2 PAPER PATH............................................................................................1-3
1.3 DRUM PROCESSES ............................................................................... *
1.4 MECHANICAL COMPONENTS ................................................................1-4
1.5 DRIVE LAYOUT ....................................................................................... *
1.6 ELECTRICAL COMPONENTS..................................................................1-6
DETAILED SECTION DESCRIPTIONS
2. DETAILED SECTION DESCRIPTIONS ...................................... 2-1
2.1 DRUM....................................................................................................... *
2.1.1 DRUM CHARACTERISTICS........................................................... *
2.1.2 DRUM DRIVE.................................................................................. *
2.2 CHARGE .................................................................................................. *
2.2.1 OVERVIEW ..................................................................................... *
2.2.2 CHARGE CORONA CIRCUIT......................................................... *
2.2.3 CORONA UNIT VENTILATION ....................................................... *
2.3 EXPOSURE...............................................................................................2-1
2.3.1 OVERVIEW ..................................................................................... *
2.3.2 PAPER AND ORIGINAL FEED (B048 ONLY)..................................2-1
Basic Operation (Manual Feed)........................................................... *
Original Jam Check Timing.................................................................. *
Drive Mechanism ................................................................................. *
Original Positioning...............................................................................2-1
Scanning...............................................................................................2-2
Start Key Enable...................................................................................2-3
2.3.3 FL REGULATOR CONTROL........................................................... *
2.3.4 MANUAL ID CONTROL................................................................... *
Manual ID Control................................................................................ *
2.4 DEVELOPMENT .......................................................................................2-4
2.4.1 OVERVIEW ..................................................................................... *
2.4.2 DRIVE MECHANISM....................................................................... *
2.4.3 CROSS-MIXING.............................................................................. *
2.4.4 TONER DENSITY CONTROL ..........................................................2-4
Toner Near End Condition ................................................................... *

Ricoh FW780 Specifications

General

Brand	Ricoh
Model	FW780
Category	Printer
Language	English