CONTENTS
3 DIS./ASSEMBLY1 OUTLINE3 DIS./ASSEMBLY2 UNIT EXPLANATION3 DIS./ASSEMBLY3 DIS./ASSEMBLY
MODEL MANUAL REVISED EDITION DATE PAGE METHOD
SERVICE MANUAL Dec. 2003
7155/7165/7255/7272
-REPLACEMENT
4
[6] M10 (Transfer/Separation Cleaning)
Control....................................................2-F-5
[7] PCL/TSL Control ....................................2-F-6
DEVELOPING UNIT............................................. 2-G-1
[1] Composition........................................... 2-G-1
[2] Mechanisms .......................................... 2-G-1
[3] M3 (Developing) Control........................ 2-G-2
[4] Developing Bias Control........................ 2-G-3
[5] Dmax Control......................................... 2-G-4
[6] Gradation Correction Control................. 2-G-6
[7] Dot Diameter Correction Control ........... 2-G-7
[8] Toner Density Control............................ 2-G-7
[9] FM4 (Developing Suction) Control ........ 2-G-8
TONER SUPPLY UNIT..........................................2-H-1
[1] Composition............................................2-H-1
[2] Mechanisms ...........................................2-H-1
[3] Toner Level Detection Control................2-H-2
[4] M12 (Toner Supply) Control ...................2-H-3
CLEANING/TONER RECYCLE UNIT .................... 2-I-1
[1] Composition............................................. 2-I-1
[2] Mechanisms ............................................ 2-I-1
[3] TGR (Toner Guide Roller) Control........... 2-I-2
[4] Other Control........................................... 2-I-2
TRAY 1/2 (7155, 7165), TRAY 3/4 (7255/7272)
PAPER FEED UNIT............................................... 2-J-1
[1] Composition............................................ 2-J-1
[2] Mechanisms ........................................... 2-J-1
[3] First Paper Feed Control ........................ 2-J-3
[4] Paper Up Drive Control .......................... 2-J-5
[5] Paper Size Detection Control ................. 2-J-6
[6] No paper detection control ..................... 2-J-7
TRAY 1/2 PAPER FEED UNIT (7255/7272).......... 2-J-8
[1] Composition............................................ 2-J-8
[2] Mechanisms ........................................... 2-J-8
[3] First Paper Feed Control ...................... 2-J-10
[4]
Horizontal Conveyance Control (Tray 1)
.... 2-J-12
[5] Paper Up Drive Control ........................ 2-J-14
[6] No paper detection control ................... 2-J-15
TRAY 3 PAPER FEED UNIT (7155/7165).............2-K-1
[1] Composition............................................2-K-1
[2] Mechanisms ...........................................2-K-1
[3] First Paper Feed Control ........................2-K-3
[4] Paper Up Drive Control ..........................2-K-5
[5] Paper Size Detection Control .................2-K-6
[6] No paper detection control .....................2-K-7
BY-PASS TRAY..................................................... 2-L-1
[1] Composition............................................ 2-L-1
[2] Mechanisms ........................................... 2-L-1
[3] First Paper Feed Control ........................ 2-L-2
[4] Paper Up/Down Control.......................... 2-L-3
[5] Paper Size Detection Control ................. 2-L-4
[6] No paper detection control ..................... 2-L-5
VERTICAL CONVEYANCE SECTION................. 2-M-1
[1] Composition........................................... 2-M-1
[2] Mechanisms .......................................... 2-M-1
[3] Vertical Conveyance Control................. 2-M-2
ADU.......................................................................2-N-1
[1] Composition ...........................................2-N-1
[2] Mechanisms...........................................2-N-2
[3] Loop/Second Paper Feed Control..........2-N-7
[4] Paper Conveyance Control....................2-N-9
[5] Paper Reverse and Exit Control...........2-N-10
[6] ADU Paper Conveyance/Feed
Control..................................................2-N-13
FIXING UNIT .........................................................2-O-1
[1] Composition ...........................................2-O-1
[2] Mechanisms...........................................2-O-1
[3] M16 (Web Drive) Control .......................2-O-3
[4] Fixing Temperature Control ...................2-O-4
OTHER KINDS OF CONTROL .............................2-P-1
[1] Parts Energized when SW1
(Main Power) is OFF............................. 2-P-1
[2] Parts that Operate when SW1 (Main
Power)/SW2 (Sub Power) is ON............2-P-2
[3] Cooling Fan Control ...............................2-P-3
[4] Operation Panel Control......................... 2-P-6
[5] Counter Control...................................... 2-P-8
[6] Option Control........................................ 2-P-9
3. DISASSEMBLY/ASSEMBLY
EXTERNAL SECTION...........................................3-A-1
[1] Replacing the Ozone Filter..................... 3-A-1
[2] Replacing the Developing Suction
Filter ....................................................3-A-1-1
[3] Removing and Reinstalling the External
Covers....................................................3-A-2
[4] Changing the Operation Panel Attachment
Angle and Removing/Reinstalling .......... 3-A-4
[5] Resetting the Circuit Breaker ................. 3-A-6
DRIVE SECTION...................................................3-B-1
[1] Removing and Reinstalling the Drum
Motor(M2)...............................................3-B-1
[2] Removing and Reinstalling the Fixing
Input Gear .............................................. 3-B-2
SCANNER SECTION............................................3-C-1
[1] Screws that Must not be Removed ........3-C-1
[2] Removing and Reinstalling the
CCD Unit................................................3-C-1
[3] Replacing the Exposure Lamp...............3-C-2
[4] Removing and Reinstalling
the Exposure Unit...................................3-C-3
[5] Installing the Optics Wire .......................3-C-4
[6] Cleaning the Slit Glass
and Platen Glass....................................3-C-6
[7] Replacing the Scanner Motor (M11) ......3-C-6
WRITE SECTION..................................................3-D-1
[1] Removing and Reinstalling
the Write Unit .........................................3-D-1
[2] Cleaning the Dust-proof Glass...............3-D-2
DRUM UNIT .......................................................... 3-E-1
[1] Removing and Reinstalling
the Drum Unit.........................................3-E-1
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