Ricoh FAX2700L SPECIFICATIONS mv310

LSO

RICOH MV310

SERVICE MANUAL

May 22nd, 1995
Subject to change

WARNING

I

THIS MACHINE CONTAINS A LASER BEAM GENE RATOR. LASER
BEAMS CAN CAUSE PERMANENT EYE DAMAGE. DO NOT OPEN THE
LASER UNIT OR LOOK ALONG THE LASER BEAM PATH WHILE THE
MAIN POWER IS ON.

Lithium Batteries (Memory Back-up)

CAUTION

I

The danger of explosion exists if a battery of this type is inc orr ectly
replaced. Replace only with the same or an equivalent type
recommended by the manufacturer. Discard used batteries in
accordance with the manufactur er’s instructions.

Table of Contents

1. OVERALL MACHINE INFORMATION

1.1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . 1-1

1.2. FEATURES . . . . . . . . . . . . . . . . . . . . . 1-3

1.3. COMPONENT LAYOUT . . . . . . . . . . . . . . . . 1-6

1.3.1. Mechanical Comp onen ts . . . . . . . . . . . . . . 1-6

1.3.2. Electrical Compo nents . . . . . . . . . . . . . . . 1-8

1. PCBs . . . . . . . . . . . . . . . . . . . . . . 1-9

2. Motors and Clutche s . . . . . . . . . . . . . . . . 1-9

3. Sensors . . . . . . . . . . . . . . . . . . . . . 1-10

4. Interlock Switches . . . . . . . . . . . . . . . . . 1-10

5. Others . . . . . . . . . . . . . . . . . . . . . . 1-11

6. Options . . . . . . . . . . . . . . . . . . . . . 1-12

1.4. OVERALL MACHINE CONTROL . . . . . . . . . . . . 1-13

1.5. VIDEO DATA PATH . . . . . . . . . . . . . . . . . . 1-14

1.5.1. Transmission . . . . . . . . . . . . . . . . . . . 1-14

1.5.2. Recept ion . . . . . . . . . . . . . . . . . . . . 1-15

1.5.3. Copying . . . . . . . . . . . . . . . . . . . . . 1-16

1.5.4. Printing usin g the Optional Printer In terface . . . . . . . 1-18

1.6. POWER DISTRIBUTION . . . . . . . . . . . . . . . . 1-19

1.6.1. Distribution Diagram . . . . . . . . . . . . . . . . 1-19

1.6.2. Memory Back-up Circuit . . . . . . . . . . . . . . 1-20

2. DETAILED SECTION DESCRIPTIO NS

2.1. SCANNER . . . . . . . . . . . . . . . . . . . . . 2-1

2.1.1. Overview . . . . . . . . . . . . . . . . . . . . 2-1

1. Book Scanner . . . . . . . . . . . . . . . . . . . 2-1

2. ADF . . . . . . . . . . . . . . . . . . . . . . . 2-2

2.1.2. Original Dete ction . . . . . . . . . . . . . . . . . 2-3

1. Book Scanner . . . . . . . . . . . . . . . . . . . 2-3

2. ADF . . . . . . . . . . . . . . . . . . . . . . . 2-5

2.1.3. Scanning . . . . . . . . . . . . . . . . . . . . 2-6

1. Contact Image Sensor . . . . . . . . . . . . . . . 2-6

2. Main Scan Resolutio n and Width (Book Scanner) . . . . . 2-7

3. Main Scan Resolutio n and Width (ADF) . . . . . . . . . 2-8

4. Sub Scan Resolutions and Length (Book Scanner) . . . . 2-8

5. Sub Scan Resolutions and Length (ADF) . . . . . . . . 2-8

6. Sub Scan Resolution Conversion . . . . . . . . . . . 2-9

2.1.4. Drive Mechanism . . . . . . . . . . . . . . . . . 2-10

1. Book Scanner . . . . . . . . . . . . . . . . . . . 2-10

2. ADF . . . . . . . . . . . . . . . . . . . . . . . 2-11

3. Scanner Po sitio n Fine Adjustment . . . . . . . . . . . 2-12

2.1.5. Pick-up and Feed (ADF) . . . . . . . . . . . . . . 2-13

2.1.6. Separation Mecha nism (ADF) . . . . . . . . . . . . 2-13

2.1.7. Stamping (ADF) . . . . . . . . . . . . . . . . . . 2-14

2.1.8. Error Conditio ns . . . . . . . . . . . . . . . . . 2-15

1. Book Scanner . . . . . . . . . . . . . . . . . . . 2-15

2. ADF . . . . . . . . . . . . . . . . . . . . . . . 2-15

2.1.9. Video Processing . . . . . . . . . . . . . . . . . 2-17

1. Analo g Signal Proce ssing . . . . . . . . . . . . . . 2-17

2. Digital Video Proce ssing Steps . . . . . . . . . . . . 2-18

3. Video Proce ssing Parameters . . . . . . . . . . . . 2-22

2.2. PRINTING . . . . . . . . . . . . . . . . . . . . . . 2-23

2.2.1. Printing Pro cess - O vervie w . . . . . . . . . . . . . 2-23

2.2.2. OPC Drum . . . . . . . . . . . . . . . . . . . . 2-24

2.2.3. Charge . . . . . . . . . . . . . . . . . . . . . 2-24

2.2.4. Laser Exposure . . . . . . . . . . . . . . . . . . 2-26

1. Overview . . . . . . . . . . . . . . . . . . . . . 2-26

2. Block Diagram . . . . . . . . . . . . . . . . . . . 2-27

3. Error Conditions . . . . . . . . . . . . . . . . . . 2-27

4. Print Density Adjustmen t . . . . . . . . . . . . . . . 2-28

5. Enlargement . . . . . . . . . . . . . . . . . . . 2-28

6. Toner Saving Mod e . . . . . . . . . . . . . . . . . 2-29

2.2.5. Toner Supply . . . . . . . . . . . . . . . . . . . 2-30

2.2.6. Develop men t . . . . . . . . . . . . . . . . . . . 2-33

2.2.7. Paper Feed . . . . . . . . . . . . . . . . . . . 2-38

1. Overview . . . . . . . . . . . . . . . . . . . . . 2-38

2. Paper Lift Mechanism . . . . . . . . . . . . . . . . 2-39

3. Paper Size and Paper End Dete ction . . . . . . . . . . 2-40

4. Pick-up and Separation . . . . . . . . . . . . . . . 2-42

5. Drive Mechanism . . . . . . . . . . . . . . . . . 2-42

2.2.8. Registration . . . . . . . . . . . . . . . . . . . 2-45

2.2.9. Transfer and Separation . . . . . . . . . . . . . . 2-47

2.2.10. Cleaning . . . . . . . . . . . . . . . . . . . . 2-50

2.2.11. Fusing . . . . . . . . . . . . . . . . . . . . . 2-51

2.2.12. Page Separation and Data Reduction . . . . . . . . 2-55

2.2.13. Paper Size Selection . . . . . . . . . . . . . . . 2-57

2.3. SYSTEM FEATURES . . . . . . . . . . . . . . . . . 2-58

2.3.1. Power Saver Modes . . . . . . . . . . . . . . . . 2-58

1. Going into a Power Saver Mode . . . . . . . . . . . . 2-59

2. Going into Level 2 Mode from Le vel 1 Mod e . . . . . . . 2-61

3. Receiving a Fax Message in Power Sa ver Mode . . . . . 2-63

4. Sending a Fax Message or Copying in Power Saver Mode . 2-65

2.3.2. Automatic Service Ca lls . . . . . . . . . . . . . . 2-67

1. Service Call Conditions . . . . . . . . . . . . . . . 2-67

2. Excessive Jam Alarms . . . . . . . . . . . . . . . 2-68

3. Periodic Service Call . . . . . . . . . . . . . . . . 2-69

4. PM Call . . . . . . . . . . . . . . . . . . . . . 2-70

5. Effective Term of Se rvice Calls . . . . . . . . . . . . 2-70

2.4. PCBs . . . . . . . . . . . . . . . . . . . . . . . 2-71

2.4.1. FCE . . . . . . . . . . . . . . . . . . . . . . 2-71

2.4.2. FDU . . . . . . . . . . . . . . . . . . . . . . 2-73

2.4.3. PSU . . . . . . . . . . . . . . . . . . . . . . 2-74

2.4.4. NCU (USA) . . . . . . . . . . . . . . . . . . . 2-75

1. Jumpers . . . . . . . . . . . . . . . . . . . . . 2-75

2.4.5. NCU (Europe/Asia) . . . . . . . . . . . . . . . . 2-76

1. Control Signals and Jumpers . . . . . . . . . . . . . 2-76

3. INSTALLATION

3.1. INSTALLING THE MACHINE . . . . . . . . . . . . . . 3-1

3.2. INITIAL PROGRAMMING . . . . . . . . . . . . . . . 3-1

3.3. OPTIONAL UNITS . . . . . . . . . . . . . . . . . . 3-2

3.3.1. Counter . . . . . . . . . . . . . . . . . . . . . 3-2

3.3.2. Printe r Interface . . . . . . . . . . . . . . . . . . 3-3

4. SERVICE TABLES AND PROCEDURES

4.1. SERVICE LEV E L FUNCTIONS . . . . . . . . . . . . . 4-1

4.1.1. Bit Switch Prog ramming (Function 01) . . . . . . . . . 4-1

4.1.2. System Parame te r L ist (Fun ction 02) . . . . . . . . . 4-2

4.1.3. Error Code Display (Fun ction 03) . . . . . . . . . . . 4-2

4.1.4. Service Monitor Report (Function 04) . . . . . . . . . 4-2

4.1.5. Protocol Dump (Fu nct ion 05) . . . . . . . . . . . . 4-3

4.1.6. RAM Display/Rewrite (Function 06) . . . . . . . . . . 4-3

4.1.7. RAM Dump (Function 06) . . . . . . . . . . . . . . 4-4

4.1.8. Counter Displa y/Re write (Function 07) . . . . . . . . . 4-4

4.1.9. NCU Parameters (Function 08) . . . . . . . . . . . . 4-5

4.1.10. Modem Test (Function 08) . . . . . . . . . . . . . 4-6

4.1.11. DTMF Tone Test (Function 08) . . . . . . . . . . . 4-6

4.1.12. Modem Detection Test (Function 08) . . . . . . . . . 4-7

4.1.13. Ringer Test (Function 08) . . . . . . . . . . . . . 4-7

4.1.14. Operation Panel Test (Fu nction 09) . . . . . . . . . 4-8

4.1.15. LED Array Test (Function 10) . . . . . . . . . . . . 4-8

4.1.16. ADF Test (Function 10) . . . . . . . . . . . . . . 4-9

4.1.17. Book Mode Scanner Mechanism Test (Function 10) . . . 4-9

4.1.18. Auto Paper Select Mod e Test (Function 10) . . . . . . 4-10

4.1.19. Image Sensor Ch eck/ Clock Rese t (Function 10) . . . . 4-10

4.1.20. Printer Test Pa tterns (Function 11) . . . . . . . . . . 4-11

4.1.21. Printer Mechanism Test - Free Ru n (Function 11) . . . . 4-12

4.1.22. RAM Tests (Fun ction 12) . . . . . . . . . . . . . . 4-12

4.1.23. Software Download (Function 12) . . . . . . . . . . 4-13

4.1.24. Software Upload (Function 12) . . . . . . . . . . . 4-14

4.1.25. SRAM Data Download (Function 12) . . . . . . . . . 4-15

4.1.26. Serial Numbe r (Fu nct ion 14) . . . . . . . . . . . . 4-16

4.1.27. Service Station Telephone Numbe r (Fun ction 13) . . . . 4-17

4.2. BIT SWITCHES . . . . . . . . . . . . . . . . . . . 4-18

4.2.1. System Switche s . . . . . . . . . . . . . . . . . 4-18

4.2.2. Scanner Switche s . . . . . . . . . . . . . . . . 4-28

4.2.3. Printer Switch es . . . . . . . . . . . . . . . . . 4-29

4.2.4. Communicatio n Switches . . . . . . . . . . . . . . 4-32

4.2.5. G3 Switches . . . . . . . . . . . . . . . . . . . 4-38

4.3. NCU PARAMETERS . . . . . . . . . . . . . . . . . 4-44

4.4. DEDICATED TRANSMISSION PARAMETERS . . . . . . . 4-72

4.4.1. Programming Procedure . . . . . . . . . . . . . . 4-72

4.4.2. Parameters . . . . . . . . . . . . . . . . . . . 4-73

4.5. SERVI CE RAM ADDRESSES . . . . . . . . . . . . . . 4-75

4.6. SPECIAL TOOLS AND LUBRICANTS . . . . . . . . . . 4-87

4.7. PM TABLE . . . . . . . . . . . . . . . . . . . . . 4-87

5. REPLACEMENT AND ADJUSTMENT

5.1. EXTERIOR . . . . . . . . . . . . . . . . . . . . . 5-1

5.1.1. ADF . . . . . . . . . . . . . . . . . . . . . . 5-1

5.1.2. Operatio n P an el a nd Copy Tray . . . . . . . . . . . 5-3

5.1.3. Platen Cover a nd Origin al Scales . . . . . . . . . . . 5-3

5.1.4. Top Cover and Exposure Glass . . . . . . . . . . . 5-4

5.1.5. Left, Fron t, and Rear Cove r . . . . . . . . . . . . . 5-4

5.2. SCANNER . . . . . . . . . . . . . . . . . . . . . 5-5

5.2.1. Conta ct Ima ge Sensor . . . . . . . . . . . . . . . 5-5

5.2.2. Fluorescent Lamp Sta bilizer . . . . . . . . . . . . . 5-6

5.2.3. Original Size, Plat en Cover, and Scanner H. P. Sensors . . 5-6

5.2.4. Scanner Motor . . . . . . . . . . . . . . . . . . 5-7

5.3. LASER PRINTING COMPONENTS . . . . . . . . . . . 5-7

5.3.1. Inner Cover . . . . . . . . . . . . . . . . . . . 5-7

5.3.2. Laser Unit . . . . . . . . . . . . . . . . . . . . 5-8

5.3.3. Laser Diode Unit and Hexag onal Mirror Motor . . . . . . 5-9

5.4. DEVELOPMENT . . . . . . . . . . . . . . . . . . . 5-10

5.4.1. Master Drum . . . . . . . . . . . . . . . . . . . 5-10

5.4.2. Develop men t Unit . . . . . . . . . . . . . . . . . 5-10

5.4.3. Transfer Roller . . . . . . . . . . . . . . . . . . 5-11

5.4.4. Main Moto r and Gears . . . . . . . . . . . . . . . 5-1 1

5.4.5. Replacing th e Development Unit . . . . . . . . . . . 5-12

5.5. FUSING . . . . . . . . . . . . . . . . . . . . . . 5-15

5.5.1. Thermisto r . . . . . . . . . . . . . . . . . . . . 5-15

5.5.2. Fusing Unit . . . . . . . . . . . . . . . . . . . 5-15

5.5.3. Hot Roller Strippers . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17

5.5.4. Fusing Lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17

5.5.5. Hot Roller . . . . . . . . . . . . . . . . . . . . 5-18

5.5.6. Pressure Roller . . . . . . . . . . . . . . . . . . 5-20

5.5.7. Thermost at an d Thermofuse . . . . . . . . . . . . . 5-20

5.6. PAPER FEED . . . . . . . . . . . . . . . . . . . . 5-21

5.6.1. Paper Feed Roller an d Clut ch . . . . . . . . . . . . 5-21

5.6.2. Paper End Sensor . . . . . . . . . . . . . . . . . 5-21

5.6.3. Registratio n Se nso r a nd Pressu re Rolle r s . . . . . . . 5-22

5.6.4. Paper Feed Motor, Gears and Registration Roller . . . . 5-22

5.6.5. Bypass Fee d Se nsor . . . . . . . . . . . . . . . . 5-23

5.6.6. Paper Size Sensor . . . . . . . . . . . . . . . . 5-23

5.7. PCBs . . . . . . . . . . . . . . . . . . . . . . . 5-24

5.7.1. PSU . . . . . . . . . . . . . . . . . . . . . . 5-24

5.7.2. NCU . . . . . . . . . . . . . . . . . . . . . . 5-24

5.7.3. FDU and FCE . . . . . . . . . . . . . . . . . . 5-25

5.7.4. Power Pack . . . . . . . . . . . . . . . . . . . 5-26

5.8. OTHERS . . . . . . . . . . . . . . . . . . . . . . 5-26

5.8.1. Ozone Filter and Fan Moto r . . . . . . . . . . . . . 5-26

5.8.2. Toner End Sensor . . . . . . . . . . . . . . . . . 5-27

5.9. ADF . . . . . . . . . . . . . . . . . . . . . . . . 5-27

5.9.1. ADF Roller Asssembly an d Covers . . . . . . . . . . 5-27

5.9.2. Pick-up Roller . . . . . . . . . . . . . . . . . . 5-28

5.9.3. Feed Roller . . . . . . . . . . . . . . . . . . . 5-28

5.9.4. Separation Roller . . . . . . . . . . . . . . . . . 5-29

5.9.5. ADF Mot or a nd Covers . . . . . . . . . . . . . . . 5-29

5.9.6. R0 and R1 Rollers . . . . . . . . . . . . . . . . . 5-30

5.9.7. R2 Roller . . . . . . . . . . . . . . . . . . . . 5-30

5.9.8. Document Se nsor and Width Sensor . . . . . . . . . 5-31

5.9.9. Scan Line Sensor . . . . . . . . . . . . . . . . . 5-32

5.9.10. Cover Sensors . . . . . . . . . . . . . . . . . . 5-32

5.10. 100 SHEET PAPER CASSETTE (OPTIONAL) . . . . . . . 5-34

5.10.1. Relay Conne cto r and Gea r Cover . . . . . . . . . . 5-34

5.10.2. Paper End Senso r and Drive Co mpo ne nt s . . . . . . . 5-35

5.10.3. Paper Size Sen sor . . . . . . . . . . . . . . . . 5-36

5.11. IMAGE ADJ USTMENT . . . . . . . . . . . . . . . . 5-37

5.11.1. Overview . . . . . . . . . . . . . . . . . . . . 5-37

5.11.2. Scanner Parameters . . . . . . . . . . . . . . . 5-38

1. Contrast . . . . . . . . . . . . . . . . . . . . . 5-38

2. Margins . . . . . . . . . . . . . . . . . . . . . 5-38

5.11.3. Printer Parameters . . . . . . . . . . . . . . . . 5-40

1. Margin (Main Scan Directio n) . . . . . . . . . . . . . 5-40

2. Margin (Sub Scan Direction ) . . . . . . . . . . . . . 5-41

5.11.4. Scanner Video Proce ssing Parameters . . . . . . . . 5-42

1. Contrast . . . . . . . . . . . . . . . . . . . . . 5-42

2. Image P rocessing Paramete rs Ad just ment . . . . . . . . 5-43

6. TROUBLESHOOTING

6.1. COPY QUALITY TROUBLESHOOTING . . . . . . . . . . 6-1

6.1.1. Blank Copies . . . . . . . . . . . . . . . . . . . 6-2

6.1.2. Black Copies . . . . . . . . . . . . . . . . . . . 6-4

6.1.3. Dirty Background . . . . . . . . . . . . . . . . . 6-5

6.1.4. Uneven Image Den sity . . . . . . . . . . . . . . . 6-6

6.1.5. Vertical Black Lines . . . . . . . . . . . . . . . . 6-7

6.1.6. Horizontal Black Lines . . . . . . . . . . . . . . . 6-8

6.1.7. Vertical White Lines . . . . . . . . . . . . . . . . 6-9

6.1.8. Horizontal White Lin es . . . . . . . . . . . . . . . 6-10

6.1.9. Black Dots/Spots . . . . . . . . . . . . . . . . . 6-11

6.1.10. White Spots in Black Image Areas . . . . . . . . . . 6-12

6.1.11. Faint Copies . . . . . . . . . . . . . . . . . . 6-13

6.1.12. Vertical Black Band . . . . . . . . . . . . . . . . 6-15

6.1.13. Unfused Copies . . . . . . . . . . . . . . . . . 6-16

6.1.14. Ghost Image . . . . . . . . . . . . . . . . . . 6-16

6.1.15. Toner on the Back o f t he Prin ter Paper . . . . . . . . 6-17

6.1.16. Misaligned Outpu t (Dat a shif te d to the right or left ) . . . 6-18

6.1.17. Misaligned Output (Image shifted vertically)/Reduced Image 6-18

6.2. MECHANICAL PROBLEMS . . . . . . . . . . . . . . 6-19

6.2.1. ADF . . . . . . . . . . . . . . . . . . . . . . 6-19

1. Non Feed . . . . . . . . . . . . . . . . . . . . 6-19

2. Jam . . . . . . . . . . . . . . . . . . . . . . . 6-20

3. Skew . . . . . . . . . . . . . . . . . . . . . . 6-21

4. Multi-feed . . . . . . . . . . . . . . . . . . . . 6-21

6.2.2. Book Scanner . . . . . . . . . . . . . . . . . . 6-22

1. Abnormal Noise . . . . . . . . . . . . . . . . . . 6-22

2. Scanner Home Position Error (Erro r Co de 9-11) . . . . . 6-22

3. Automatic P ap er Selection Error . . . . . . . . . . . . 6-23

4. Scanning Start Position Erro r (Error Cod e 1-0 9) . . . . . 6-23

6.2.3. Printe r . . . . . . . . . . . . . . . . . . . . . 6-24

1. Non-feed . . . . . . . . . . . . . . . . . . . . . 6-24

2. Paper Jam - Inside the Print er . . . . . . . . . . . . 6-25

3. Jam - Fusing Exit . . . . . . . . . . . . . . . . . 6-26

4. Skew . . . . . . . . . . . . . . . . . . . . . . 6-27

5. Multi-feed . . . . . . . . . . . . . . . . . . . . 6-27

6.3. SERVICE CALL CONDITIONS . . . . . . . . . . . . . 6-28

6.4. ERROR CODES . . . . . . . . . . . . . . . . . . . 6-32

6.5. ELECTRICAL COMPONE NT DEFECTS . . . . . . . . . 6-39

6.5.1. Defe ctive Sensor Table . . . . . . . . . . . . . . . 6-39

6.5.2. Blown Fuse Table . . . . . . . . . . . . . . . . . 6-40

May 22nd, 1995 OVERALL MACHINE INFORMATION

SPECIFICATIONS

1. OVERALL MACHINE INFORMATION

1.1. SPECIFICATIONS

Type

Desktop transceiver

Circuit

PSTN, PABX

Connection

Direct couple

Book Scanner
Document Size:
Smaller than 257 x 364 mm

[10.1 x 14.3 ins]

Thickness: Less than 30 mm
Weight: Less than 5 kg

ADF

Document Size
Length: 105 - 364 mm

[4.1 - 16.5 ins]

Up to 1200 mm [47.2 ins],

manually assisted

Width: 148 - 257 mm

[5.8 - 10.1 ins]

Thickness: 0.05 to 0.2 mm [2 to 8 mils]

(equivalent to 50 - 90 g/m

0.04 to 0.4 mm [1.6 to 16 mils],

manually assisted

(equivalent to 40 - 120 g/m

Document Feed

Automatic feed, face up

ADF Capacity

30 sheets (using 20 lb paper)

Scanning Method

Contact image sensor, with xenon lamp

Maximum Scan Width

256 mm [10.1 ins] ± 0.25%

Scan Resolution
Fax mode

Standard: 8 x 3.85 lines/mm [203 x 98 dpi]
Detail: 8 x 7.7 lines/mm [203 x 196 dpi]
Fine: 8 x 15.4 lines/mm [203 x 392 dpi]

Copy mode:

16 x 15.4 lines/mm [406 x 392 dpi]

Memory Capacity
ECM: 64 or 128 kB; single or double buffer
SAF: 576 kB (45 pages/A4)

2

)

2

)

Protocol

Group 3 with ECM

Compression

MH, MR, EFC, MMR, SSC (MMR only with
ECM)
Storage to SAF memory for tx: MMR and/or
raw data

Modulation

V.29 (QAM), V.27ter (PHM), V.21 (FM)

Data Rate (bps)

9600/7200/4800/2400, Automatic fallback

I/O Rate

With ECM: 0 ms/line
Without ECM: 2.5, 5, 10, 20, or 40 ms/line

Transmission Time

9 s at 9600 bps; Measured with G3 ECM us­ing memory for a CCITT #1 test document
(Slerexe letter) using standard resolution

Printing System

Laser printing, plain paper, dry toner

Printing Time

10 ppm for A4 size paper

Paper Size
Standard Cassette:

USA: Half-Letter, Letter, Legal
Europe/Asia: A4, A5, B5, F, F4

Optional 100 Sheet Cassette:

USA: Half-letter, Letter, Legal
Europe/Asia: A4, A5, B5 lengthwise, F/F4

Paper Capacity
Standard Cassette: - 250 sheets
Optional 100 Sheet Cassette:

- 100 sheets

Bypass Feeder: - 1 page
Maximum Printing Width

248 mm [9.8 ins]

Printer Resolution
Fax/Copy Mode: 16 x 15.4 lines/mm

[406 x 392 dpi]

Printer Mode: 300 x 300 dpi
Power Supply

USA: 115 ± 20 Vac, 60 ± 1 Hz
Europe/Asia: 220 Vac +20/-10%, 50 ± 1 Hz

1-1

OVERALL MACHINE INFORMATION May 22nd, 1995
SPECIFICATIONS

Power Consumption
Standby: Minimum 2 W, Normal 70 W
Transmitting: 35 W
Receiving: 200 W
Copying: Normal 300 W, Maximum 800 W

Operating Environment
Temperature: 17 - 28 °C [63 - 82 °F]
Humidity: 40 - 70 %Rh

Dimensions (W x D x H)

555 x 555 x 342 mm [21.9 x 21.9 x 13.5 ins]
Excluding handset, trays, and optional units

Weight

30 kg [66 lbs]
Excluding handset, trays, and optional units

1-2

May 22nd, 1995 OVERALL MACHINE INFORMATION

FEATURES

1.2. FEATURES

KEY: O = Used, X = Not Used

A = With optional 100 sheet cassette only
B = With optional counter only
C = With optional handset only
D = With printer interface only

Equipment

ADF O
Book scanner O
Built-in handset X
Bypass feed: 1 sheet O
Optional cassette: 100 sheets A
Cabinet X
Counter B
Cutter X
Handset C
Hard disk X
Manual feed mechanism X
Marker (Stamp) O
Monitor speaker O
Printer interface option D

Video Processing Features

Contrast O
Auto image density control O
Halftone (Basic & Error Diffusion) O
MTF O
Reduction (Fax) O
Resolution O
Smoothing to 16 x 15.4 l/mm

(Fax)

Communication Features - Auto

Automatic fallback O
Automatic redialing O
Confidential reception X
Dual Access O
Substitute reception O

Communication Features -

User Selectable

Action as a transfer broadcaster X
AI Redial (last ten numbers) X
Answering machine interface X
Authorized Reception O
Auto-answer delay time X

Communication Features -

User Selectable

Auto dialing (pulse or DTMF) O
Auto Document X
Auto image density selection O
Automatic Voice Message X
Batch Transmission X
Broadcasting O
Chain Dialing X
Communication Result Display X
Confidential ID Override X
Confidential Transmission X
Direct Fax Number Entry O
Economy Transmission X
Fax on demand X
Forwarding X
Free Polling X
Groups (3 groups) O
Group Transfer Station X
Hold X
ID Transmission Option X
Immediate Redialing O
Immediate transmission O
Keystroke Programs X
Memory transmission O
Multi-step Transfer X
Next Transfer Station X
OMR X
On Hook Dial O
Ordering Toner X

O

Page Count O
Personal Codes X
Personal Codes with Conf. ID X
Polling Reception O
Polling Transmission X
Polling tx file lifetime in the SAF X
Quick Dial (20 stations) O
Reception modes (Fax, Tel,
Reduction O
Remote control features X
Remote Transfer X
Restricted Access X
Secured Polling X
Secured Polling with Stored ID

Override
Secure Transmission X
Send Later O

Auto) O

X

1-3

OVERALL MACHINE INFORMATION May 22nd, 1995
FEATURES

Communication Features -

User Selectable

Silent ringing detection X
Specified Image Area X
Speed Dial (50 stations) O
Super Fine Resolution

(16 x15.4 l/mm : 400 x 400 dpi)
Telephone Directory X
Tonal Signal Transmission O
Transfer Request X
Transmission Deadline (TRD) X
Turnaround Polling X
Two- step Transfer X
Two in one X
Voice Request (immed. tx only) X

Communication Features -

Service Selectable

AI Short Protocol O
Auto-reduction override option O
Busy tone detection O
Closed Network (tx and rx) X
Continuous Polling Reception X
Dedicated tx parameters O
ECM O
EFC O
Inch-mm conversion X
Page retransmission O
Page separation mark O
Protection against wrong conn. O
Resol’n stepdown override option X
Short Preamble X
Well log O

Copier Features

Auto Image Density O
Auto Paper Select (Book mode) O
Reduction/Enlargement O
Erase center/border O
Distribution number printing O
Center marks O

Other User Features

Area Code Prefix X
Auto Service Call O
Center mark O
Checkered mark X

X

Other User Features

Clearing a memory file O
Clearing a polling file O
Clock O
Confidential ID X
Copy mode O
Copy Mode Restriction X
Counters O
Daylight Saving Time (USA only) O
Destination Check X
Direct entry of names O
File Retention Time X
File Retransmission O
Function Programs X
ID Code X
Label Insertion ("From xxx") X
Language Selection O
LCD contrast control Service
Memory Lock X
Memory Lock ID X
Modifying a memory file X
Multi Sort Document Reception X
Multicopy mode (up to 99) O
Own telephone number X
Power Saver (Night Timer and

standby mode)
Print density control O
Printing a memory file O
RDS on/off O
Reception Mode Switching Timer X
Reception time printing X
Remaining memory indicator O
Remote ID X
Reverse Order Printing X
RTI, TTI, CSI O
Secure ID X
Service Report Transmission O
Speaker volume control O
Specified Cassette Selection X
Substitute reception on/off O
Telephone line type O
Toner saving mode O
TTI on/off O
User Function Keys X
User Parameters O
Wild Cards O

O

1-4

May 22nd, 1995 OVERALL MACHINE INFORMATION

FEATURES

Reports - Automat ic

Charge Control Report X
Communication Failure Report O
Confidential File Report X
Error Report O
Memory Storage Report O
Mode Change Report X
Polling Clear Report X
Polling Reserve Report O
Polling Result Report O
Power Failure Report O
TCR O
Toner Cassette Order Form X
Transfer Result Report X
Transmission Result Report O

Reports - User-initiated

Authorized Reception List O
Charge Control Report X
File List O
Forwarding List X
Group List O
Personal Code List X
Program List X
Quick Dial List O
Specified Cassette Selection List X
Speed Dial List O
TCR O
Transmission Status Report X
User Function List X
User Parameter List O

Service Mode Features

Auto Paper Select Test O
Back-to-back test O
Bit switch programming O
Book Test O
Buzzer test O
Cable equalizer O
Comm. parameter display O
Counter check O
Country code O
DTMF tone test O
Echo countermeasure O
Effective term of service calls O
Error code display O
Excessive jam alarm O

Service Mode Features

File Transfer O
Hex Dump List E
LCD contrast adjustment O
Line error mark O
Memory file printout (all files) O
Modem test O
NCU parameters O
Operation panel test O
Periodic service call O
PM Call O
Printer mechanism test X
Printer test patterns O
Programmable attenuation X
Protocol dump list O
RAM display/rewrite O
RAM dump O
RAM test O
Ringer test X
Scanner lamp test O
Scanner mechanism test O
Sensor initialization X
Serial number O
Service monitor report O
Service station number O
Software upload/download O
SRAM data download O
Status Sheet D
System parameter list O
Technical data on the TCR O
Thermal head parameters X
Transmission Status Report X
User data transfer O

Memory Files

Max. number of files: 100
Max. number of stations/ file : 10 0
Max. number of stations ove rall: 200
Max. number of pages overall: 150

1-5

15
23

OVERALL MACHINE INFORMATION May 22nd, 1995
COMPONENT LAYOUT

1.3. COMPONENT LAYOUT

1.3.1. Mechanical Components

3

5

4

6

7

8

10

9

11

12

13 14

16

17

18

19

20

21

22

2

1

25 24

No. Name Description

Scanner Contains a contact image sensor and a xenon lamp

1
2 R1 Roller Feeds the document through the scanner.

3 R0 Roller Feeds the document into the scanner.

Separation roller Prevents more than one sheet from feeding into the

4
5 Document Feed Roller Feeds the document into the scanner.

Pick-up Roller Picks up pages of the document from the document

6
7 R2 Roller Feeds the document through the scanner.

Laser Unit This consists of the LDDR (Laser Diode Driver),

8

driver.

scanner.

table one at a time.

Focusing lens, Fθ Lenses, Hexagonal mirror motor, and
other laser optic components.

H521V501.wmf

1-6

May 22nd, 1995 OVERALL MACHINE INFORMATION

COMPONENT LAYOUT

No. Name Description

Toner Supply Bar This stirs up and transfers toner to the toner application

9

10 Toner Application Roller This roller transfers toner to the development roller.
11 Development Roller This roller applies toner to the latent image on the drum.

Platen Cover This covers the original which was placed on the

12
13 Exposure Glass Book scanner reads the original on it.

CTM (Cleaning Toner

14

Magazine)
OPC Drum The latent image is written to this Organic

15
16 Hot Roller Heat from this roller fuses the toner to the copy paper.

Cleaning Pad This cleans up and spreads silicone oil on the surface

17
18 Hot Roller Strippers These take the paper off the hot roller after fusing.

19 Paper Feed-out Rollers These feed the paper out of the printer.
20 Fusing Pressure Roller This applies pressure to the paper during fusing.

Transfer Roller This applies a charge to the paper to pull the toner off

21

Paper Feed Rollers (100

22

Sheet Cassette)

23 Registration Roller This carries out the registration process.

Paper Feed Pressure

24

Rollers
Paper Feed Rollers These pick up the top sheet of paper from the stack in

25

roller.

exposure glass.

This consists of the toner cartridge, cleaning unit, used
toner tank, charge corona unit, and quenching lamp.

Photoconductor Drum.

of the hot roller.

the drum and onto the copy paper.
These pick up the top sheet of paper from the stack in

the optional 100 sheet cassette and feed it into the
printer.

These feed paper from the cassette or bypass feed slot
into the printer.

the cassette and feed it into the printer.

1-7

1

25

26

37

38

OVERALL MACHINE INFORMATION May 22nd, 1995
COMPONENT LAYOUT

1.3.2. Electrical Components

5

4

3

2

16

15

14

6

7

8

9

10

11

12

13

42

17

41

18

19

20

40

21

H521V503.wmf

22

23

24

27

28

29

30

31

32

33

34

35

36

H521V504.WMF

39

1-8

May 22nd, 1995 OVERALL MACHINE INFORMATION

COMPONENT LAYOUT

1. PCBs

No. Name Description

FDU (Facsimile Driver

3

Unit)

FCE (Facsimile Control

2

Engine)
NCU (Network Control

5

Unit)
OPU (Operation Panel

1

Unit)
PSU (Power Supply Unit) This board supplies power to the machine, and

7

LDDR (Laser Diode

15

Driver)
Power Pack This supplies high voltages to the corona wire, transfer

14

Contact Image Sensor
and Xenon Lamp

9

IC Card This contains a DRAM which is used as page memory

16

This board contains drivers for the motors, a dc-dc
converter, the energy saving mode cpu, and other drive
electronics.

This board controls the machine. It contains the main
cpu, flash ROM, system RAM, and so on.

This board contains a relay and switches for interfacing
the machine to the network and the handset.

This board controls the operation panel.

switches the fusing lamp on/off.
This board drives the laser diode.

roller, and development bias terminal.
This sensor reads and converts the light reflected from

the document into an analog video signal. It uses an
RMLA (Roof Mirror Lens Array ) sensor unit.
The xenon lamp which illuminates the document is
contained in this unit.

for 400 x 400 dpi printing of incoming B4 faxes.

2. Motors and Clutches

No. Name Description

6 ADF Motor This stepper motor drives the scanner.

Main Motor This brushless dc motor drives the drum, fusing unit,

10

Paper Feed Motor This stepper motor drives the registration roller and the

12

Hexagonal Mirror Motor This high-speed dc motor drives the hexagonal mirror

8

Ozone Fan Motor This removes ozone-laden air from the vicinity of the

41
29 Cooling Fan Motor This cools the interior of the machine.

4 Scanner Motor This stepper motor drives the book scanner.

Paper Feed Clutch This transfers main motor drive to the cassette and

11

development unit, and CTM.

paper feed mechanisms in the cassettes.

in the laser printer optics.

drum, and filters out the ozone.

bypass tray paper feed mechanisms.

1-9

OVERALL MACHINE INFORMATION May 22nd, 1995
COMPONENT LAYOUT

3. Sensors

No. Name Description

17 Document Sensor This detects the presence of a document in the feeder.

Scan Line Sensor This detects when a page is approaching the auto

19

Document Width Sensor This detects when a B4 width [10.1"] document has

20
39 Toner End Sensor This detects when the toner has run out.

Paper Size Detector This detects the paper size installed in the cassette.

40
33 Paper End Sensor This detects when the paper in the cassette has run out.

Registration Sensor This detects when paper has reached the registration

37

Paper Feed-out Sensor This detects when the paper has been fed out of the

31

Paper Exit Cover Switch This detects whether the paper feed-out cover is open

32

Bypass Feed Sensor This detects when a sheet of paper has been inserted

36

21 ADF Cover Switch This detects whether the ADF cover is open or closed.

Scanner Home Position

28

Sensor

2324Paper Size Sensors These detect the size of the paper which was placed

25 Platen Cover Sensor This detects whether the platen cover is open or closed.
22 ADF Switch This detects whether the ADF unit is open or closed.

shading position.

been placed in the feeder.

The user must install the correct actuator.

roller.

printer.

or closed.

into the bypass feed slot. Then the registration roller
feeds the paper a short distance into the machine to
prepare for printing, and stops.

This detects when the image sensor is at home position.

on the exposure glass.

4. Interlock Switches

No. Name Description

Fusing Unit Cover

27

Interlock Switches

30

If the fusing unit cover and/or top cover are open, these
interlock switches interrupt the +5VLD power supply for
the laser diode and the +24VD power supply for the
power pack, motors, and other components.

1-10

May 22nd, 1995 OVERALL MACHINE INFORMATION

COMPONENT LAYOUT

5. Others

No. Name Description

Stamper Ass’y This stamps a red circle on each page that is

18

Thermostat This interrupts the ac power supply to the fusing lamp if

38

35 Thermistor This monitors the temperature inside the fusing unit.
34 Fusing Lamp This fuses the toner to the paper.

Monitor Speaker This allows the user to listen to the condition of the

42

Zener Diode This ensures that the charge given to the drum by the

26
13 Lamp Stabilizer This supplies power to the xenon lamp.

successfully fed through the scanner.

the temperature of the thermostat surface exceeds
400°C.

telephone line.

charge corona wire does not exceed -750 volts.

1-11

OVERALL MACHINE INFORMATION May 22nd, 1995
COMPONENT LAYOUT

6. Options

12

3

4

7

6

5

No. Name Description

Printer Interface This allows the machine to be connected to a computer

1

RS232C Interface Board* This allows the machine to be connected to a computer

2

Paper Feed Clutch (100

3

Sheet Cassette)
Paper End Sensor (100

4

Sheet Cassette)
Paper Size Detector (100

5

Sheet Cassette)
Paper Feed Roller (100

6

Sheet Cassette)

7 Counter This counts the number of prints.

100 Sheet Cassette This increases the paper capacity of the machine, and

8

as a laser printer.

as an external fax device for example.
This transfers motor drive to the mechanisms in the

100 sheet cassette.
This detects when the paper in the optional 100 sheet

cassette has run out.
This detects the paper size installed in the optional 100

sheet cassette.
This feeds paper from the 100 sheet cassette into the

machine.

allows the machine to have more than one paper size
available at the same time.

H521V505.wmf

* This option may not be available in some countries.

1-12

May 22nd, 1995 OVERALL MACHINE INFORMATION

OVERALL MACHINE CONTROL

1.4. OVERALL MACHINE CONTROL

Optional

RS232C I/F

Optional

100 Sheet

Cassette

Optional

Printer I/F

PSU

Fusing

Lamp

Memory

FDU

Energy

Saver

CPU

DC-DC

Converter

Page

Handset

FCE

FCE

MDM

FCIP

Hybrid IC

(HIC)

SpeakerNCU

System

RAM

Control
Signals

CPU
RU8

Power

Pack

DRAM

ECM/SAF

Memory

Page

Memory

DATA/ADDRESS BUS

DMAC DCR DIP LIF

System

ROM

(Flash)

External I/O (EXIO)

Driver

Optional
Counter

Scanner

and

printer

components

and

sensors

Operation

Panel

System

RAM

(SRAM)

Drivers

(FPD)

PSIF

Sensors

PRIF

Video

SRAM

Driver

Paper

feed

motor

Amp

Book scanner

components

and

ADF sensor

LDDR

Thermistor

Contact

Image

Sensor

ADF

and

book

scanner

motors

H521V506.wmf

The FCE (Facsimile Control Engine) board contain s the FCIP (Facsimile Con­trol and Image Processor), DRAM, SRAM, Syst em ROM, and video
processing memory, and it controls the entire system throug h th e FDU (Fa c­simile Driver Unit) board.

There are two cpus in the mach ine: the main cpu (FCIP) on the FCE bo ard
and the energy saver cpu on the FDU board. In energy save r mo de, the main
CPU switches off and the energy saver CPU takes over.

The FCIP consist s of th e following component blocks:

• MDM - Modem• RU8 CPU - Main CPU

• DMAC - DMA Controller• LIF- Laser Interface

• DIP - Digital Image Processor• PRIF - Printer Interface

• DCR - Data Compression and Reconstruction

The 4 MB DRAM contains the SAF memory, ECM buffer memory, work area,
and page memory. For B4 size copies at 16 x 15.4 dot/mm resolution, a page
memory IC card is installed. A rechargeable battery ba cks up the DRAM for
one hour.

The system ROM uses a 512 KB (4 Mbits) fla sh ROM. Sof twa re in th is RO M
can be rewritten from the IC card slo t or by RDS.

1-13

OVERALL MACHINE INFORMATION May 22nd, 1995
VIDEO DATA PATH

1.5. VIDEO DATA PATH

1.5.1. Transmission

Original

Contact Image Sensor Assembly

Xenon Lamp

Image Sensor

FDU

Amplifier

Video

Processing

Memory

DRAM

DIP: Digital Image Processor

Line
Buffer
/FIFO

Memory

FCIP

DCR

DATA/ADDRESS BUS

ECM/

SAF

Memory

DIP

MDM

Amplifier

FCE

Attenuator

HIC

NCU

DCR: Data Compression and Reduction
MDM: Modem

To the network

H521V507.wmf

Immediate Transmission:

Scanned data form the contact imag e sen sor pa sses to the DI P block in the
FCIP. Afte r an alo g/ digital video processing, the DCR block compresses t he
data for transmission. The compressed data then passe s either to the FIFO
memory or to the ECM memory, before it is sent to the telephone line through
the modem.

Memory Transmission:

First, the scanned data is sto red in the SAF memory after compression in the
DCR block.
At the time for transmission, the DCR block decompre sses th e data from the
SAF memory, then compresses it again after handshakin g with the oth er te r­minal is done. The compressed data then passes either to the FI FO me mory
or to the ECM memory, before it is sent to the telephone line through th e mo­dem.

1-14

May 22nd, 1995 OVERALL MACHINE INFORMATION

VIDEO DATA PATH

1.5.2. Reception

MDM: Modem
DCR: Data Compression and Reduction
LIF: Laser Interface

H521V508.wmf

Data from the line p asse s to the modem throu gh th e NCU a nd hyb rid IC. Af­ter the modem demodulate s the data, the dat a passes to the DCR blo ck,
through either the FIFO or the ECM memory, where the data is decom­pressed to raster image data. At the same time, the compre ssed data passes
to the SAF memory as a backup in case of mecha nical problems during print­ing (substitute rece ption).

The raster image data is the n passe d to the page memory for printing. After a
page of data has been stored in the page memory, the data is sent to the
LDDR through the LIF block.

1-15

OVERALL MACHINE INFORMATION May 22nd, 1995
VIDEO DATA PATH

1.5.3. Copying

DIP: Digital Image Processor
DCR: Data Compression and Reduction
LIF: Laser Interface

H521V509.wmf]

The scanned data passe s to th e pa ge memory after video processing in the
DIP block. After a page of data ha s be en stored in the page memo ry, the data
is sent to the LDDR through the LIF block.

Reproduction/Enlargem ent Rati os

The following reproduction ratios are available:

Reduction 50% 65% 71% 74% 77% 82% 87% 93%
US Yes Yes No Yes Yes No No Yes
Europe/Asia Yes No Yes No No Yes Yes Yes
Enlargement 115% 121% 122% 129% 141% 155% 200%
US NoYesNoYesNoYesYes
Europe/Asia Yes No Yes No Yes No Yes

1-16

Scanner

Page Memory

Printer

Original

May 22nd, 1995 OVERALL MACHINE INFORMATION

VIDEO DATA PATH

Reduction and Enlargement

The reduction/e nlargement process
is done in two steps, one at th e scan­ner, and the other at the printer.

At the scanner, the machine changes
the motor speed to get a reduced/en­larged image in the sub -scan
direction. For example , th e machine
doubles the motor speed to get 50%
reduction (halving the numb er of
scan lines), and slows the motor
speed down by half to get 200% en­largement (doubling the number of
scan lines). The scanne r always

Full Size

H521V513.wmf

scans the full B4 (216 mm) width in
the main scan direction. The sca nn ed

Scanner

data is then stored in the page mem­ory for printing.

At the printer, the machine deletes

Original

Page Memory

certain specified bits from ea ch line
to reduce the printing image in the

Printer

main-scan direction. For e xamp le,
every other bit is delete d to get a
50% reduced image.
Also, the machine chang es the laser
pulse width for each pixel to enlarg e
the printing image in the main-scan
direction. For example , th e machine

50% Reduction

H521V514.wmf

doubles the pulse width to ge t a
200% enlarged image.

Scanner

Page Memory

Original

Printer

H521V515.wmf

200% Enlargement

1-17

PRIF: Printer Interface
LIF: Laser Interface

OVERALL MACHINE INFORMATION May 22nd, 1995
VIDEO DATA PATH

1.5.4. Printing using the Optional Printer Inter fac e

Optional Printer

Interface

FDU

FCE

PRIF

FCIP

LIF

LDDR

Copy

Paper

H521v512.wmf

After a page of data has been stored in the prin te r inte rface’s page memory,
the data is sent directly to the LIF through the PRIF (Printer Inte rfa ce) blo ck.

1-18

May 22nd, 1995 OVERALL MACHINE INFORMATION

POWER DISTRIBUTION

1.6. POWER DISTRIBUTIO N

1.6.1. Distribution Diagram

AC Switching

Circuit

Fusing Lamp

ON/OFF

Switching

Circuit

AC115V or 230V

Fusing

Lamp

AC

Main

Power

Main Switch

PSU

24VIN

Card

IC

+24V

+12VP
+5V
+5VD

+12VD

+5VD

+5V

24VM

24VD

Optional
Counter

DC-DC

Converter

DC-DC

Converter

Interlock

Switch

+24VD

-5V

Optional 100

Cassette

+5VBAT

Sheet

+24VM
+5V

12VP

+5V

+5VE

+5vv

+5VLD

FCE

+5VLD

LDDR

Optional

Printer I/F

+24V

+5VE

NCU

+24V
+5V

DC-DC

Converter

+5V

Optional

RS232C I/F

+5V

FDU

+24VM

+5V

+5VV

Image Sensor

Xenon Lamp

-5V

+24VM

+24VM

+24VD

+24VD

+24VD

+5V

+5V

+5V

+5VE
+24VM

+24VM
+5V

+24VD

+5V

Motors

Feed Clutch

Cooling Fan

Ozone Fan

Power Pack

Thermistor

Printer Sensors

Operation Panel

Book Scanner

Optional ADF

Stamp

H521V510.wmf

The PSU supplies +24V dc power to the FDU. The FDU co nve rts t he +24 V
dc power supply to the following supplie s.

+5V This is normally on when the main switch is on.

+5VE

+5VLD

+5VV This is a more stable power supply than +5V. It is used for the image sensor.

+5VD

+5VBAT

+24V This is normally on when the main switch is on.

+24VD This is interrupted if the fusing unit cover interlock switch opens.

+24VIN

+24VM This is interrupted if the machine enters energy saving mode.

-5V This is used for the image sensor.

+12VP This is used for the page memory card.

This is used for watching the activation signal when the machine is in energy
saving mode.

This supplies the laser diode. It is interrupted if the fusing unit cover interlock
switch opens.

This supplies the DRAM and the page memory card on the FCE to back up the
stored data for one hour, if the power is switched off and some data is stored in
them. A rechargeable lithium battery is used to generate +5VD.

This supplies the system RAM on the FCE to back up the programmed data, if
the power is switched off. A lithium battery is used to generate +5VBAT.

This supplies +24V to the fusing unit on/off switching circuit. It is interrupted if
the fusing unit cover interlock switch opens.

1-19

[A]

OVERALL MACHINE INFORMATION May 22nd, 1995
POWER DISTRIBUTION

1.6.2. Memory Back-up Circuit

FDU

FCE

CN1-92

CN1-94

1VDET

1SAFFG

Page

Memory

+5V

Switching

Circuit

POWERS

5RTCCS

FCIP

[B]

+5VE

+5VBAT

System

RAM

+5V

+5VD

DC/DC

Converter

[IC12]

+5V

DRAM

CN1-96

+5VD

Q5

+5V

D

+5VBAT

H521V511.wmf

The +5VBAT supply from the lithium batte ry [ A] backs up the syst em RAM
which contains system para met ers an d pro gra mmed telephone numbers,
and the real time clock in the main cpu. The 5R TCCS sig nal te lls th e main
cpu whether the back-up powe r (+5VBAT) is coming from the battery or from
the +5V power supply.

A rechargeable lithium batt ery [B] and the dc/dc converter on the FDU back
up the DRAM (SAF memory) for one hour, if there is data in the SAF memory
and the power is switched off. While the main power is on, the +5 VE supply
recharges the batte r y. The battery recharg es in o ne or t wo d ays.

The battery [B] generates ab ou t 3 volt s (max. 3. 2 vo lts). The dc/dc converter
(IC12) lifts this voltage to 5 volt s so it can be used as the +5 VD sup ply fo r
SAF backup. The CPU monit ors th e voltage of the +5VD sup ply wit h t he
1VDET signal. Whe n th e ba tt ery ha s run do wn, and the volta ge is lower tha n

4.4 volts, the CPU stops the dc/dc converter by dropping 1SAFFG to low and
the machine stops backing up th e memory.

There is no battery switch for the battery [B].

1-20

[F]

May 22nd, 1995 DETAILED SECTION DESCRIPTIONS

SCANNER

2. DETAILED SECTION DESCRIPTIONS

2.1. SCANNER

2.1.1. Overview

[D]

1. Book Scanner

[C]

[E]

[I]

[H]

[A]

[G]

[B]

H521D01 1.wm f

The scanner motor [A] drives th e scanner [B] through th e timin g be lt [C] and
drive wire [D]. The shaft [E] gu ide s scann er move ment in the sub-scan direc­tion. Inside the scann er [B] are a contact image senso r (co nt aining a sensor
element and xenon lamp) and a xenon lamp driver.

The scanner [B] consist s of a con tact image sensor and a xenon la mp drive r.
The original width sensor [F] and length sensor [G] together detect the size of

the original placed on the exposu re glass.
The scanner home position senso r [ H] allo ws the scann er ret urn to th e same

position after scanning.
The platen cover switch [I] detects if the cover is opened or not .

2-1

[F]

DETAILED SECTION DESCRIPTIONS May 22nd, 1995
SCANNER

2. ADF

[C]

[D]

[B]

[A]

[E]

[H]

[G]

H521D008.wmf

The sheet through type ADF feed s the docu men t f rom t he to p page of the
document stack on th e table.

The pick-up [A] and feed ro ller [B ] feed the original into the scan ne r, and the
separation roller [C] help s to fe ed one shee t at a time. Then , t he R0 [ D], R1
[E], and R2 [F] rollers feed the documen t th rou gh the scanner.

At the time of scannin g the document, the scanner ([B] on the previous page)
moves down to the scanning posit ion under the exposure glass [ G]. The shad­ing plate [H] pushes t he docu men t to the exposure glass at the scan line, so
that the document is within the image sensor’s range of focus.

After scanning, the ADF feeds out the d ocument onto the pla ten cover, and
the scanner moves back to its ho me posit ion at the right end of the scann er.

Unlike a copier’s ADF, this ADF does not have a document length sen sor. So,
some of the copier features a re n ot available when the ADF is used. Refer to
“Original Detection - ADF” later in this chapter.

2-2