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Make/Model Information:

  • Brand:   Ricoh
  • Models included:
    • Ricoh FW740 (Ricoh A163)
    • Ricoh FW750 (Ricoh A251)
    • Ricoh FW760 (Ricoh A252)
    • Ricoh FW770 (Ricoh B047)
    • Ricoh FW780 (Ricoh B048)

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English
  • Number of pages:   726
  • File size:  ∼ 23.55 MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   BMRH-1008

NOTE:  This list was created by program script and may not accurately represent the text from the source pages.   For full preview please click on 'Download sample':

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001317MIU
RICOH GROUP COMPANIES
SERVICE MANUAL
A163/A251/A252
B047/B048
LEGEND
COMPANY PRODUCT CODE
GESTETNER RICOH SAVIN
A163 N/A FW740 N/A
A251 N/A FW750 N/A
A252 N/A FW760 N/A
B047 A040 FW770 7700W
B048 A041 FW780 7800W

DOCUMENTATION HISTORY
REV. NO. DATE COMMENTS
* Original Printing
1 5/95 Revised Pages
2 5/96 Reprint
3 6/98 A251/A252 Addition
4 8/2001 B047/B048 Addition
Table of Contents
OVERALL MACHINE INFORMATION
1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2. PAPER PATH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3. DRUM PROCESSES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
4. MECHANICAL COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . 1-6
5. DRIVE LAYOUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
6. ELECTRICAL COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . 1-8
DETAILED SECTION DESCRIPTIONS
1. DRUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
1.1 DRUM CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
1.2 DRUM DRIVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2. CHARGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.1 OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2 CHARGE CORONA CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.3 CORONA UNIT VENTILATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
3. EXPOSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
3.1 OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
3.2 PAPER AND ORIGINAL FEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
3.2.1 Basic Operation (Manual Feed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
3.2.2 Original Jam Check Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
3.2.3 Drive mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
3.3 FL REGULATOR CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
3.4 MANUAL ID CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
3.4.1 Manual ID Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
4. DEVELOPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
4.1 OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
4.2 DRIVE MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
4.3 CROSS-MIXING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
4.4 TONER DENSITY CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
4.4.1 Toner Near End Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Rev. 06/2004
SM i A163
4.4.2 Recovery From Toner (Near) End condition . . . . . . . . . . . . . . . . . . . . . . 2-17
4.4.3 Toner Density Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
4.5 DEVELOPMENT BIAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
4.5.1 Basic Concept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
4.5.2 Manual Image Density Bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
4.6 TONER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
5. IMAGE TRANSFER AND PAPER SEPARATION . . . . . . . . . . . . 2-21
5.1 PRE-TRANSFER LAMP (PTL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
5.2 IMAGE TRANSFER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
5.3 PAPER SEPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
5.4 PICK-OFF MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
5.5 T/S CORONA CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
6. CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
6.1 OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
6.2 COLLECTION OF USED TONER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
7. QUENCHING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
8. FUSING AND PAPER EXIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
8.1 OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
8.2 DRIVE MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28
8.2.1 Fusing Unit Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28
8.3 FUSING TEMPERATURE CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
8.3.1 Fusing Circuit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
8.3.2 Overheat Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30
8.4 TEMPERATURE CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31
8.5 ENERGY SAVER FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34
8.6 FUSING ENTRANCE GUIDE HEIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35
9. ROLL CUTTING RAIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36
9.1 ROLL CUTTING RAIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36
INSTALLATION
1. ENVIRONMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
1.1 MINIMUM SPACE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
1.2 MACHINE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
1.3 POWER SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Rev. 06/2004
A163 ii SM
1.4 INSTALLATION PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
1.5 INSTALLATION PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
1.6 INSTALLATION PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
SERVICE TABLES
1. PREVENTIVE MAINTENANCE SCHEDULE . . . . . . . . . . . . . . . . . 4-1
1.1 PM TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
1.2 REGULAR PM PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
2. SERVICE TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
2.1 TEST POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
2.2 VARIABLE RESISTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
3. SERVICE TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
3.1 SERVICE PROGRAM MODE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
3.1.1 Service Program Mode Access Procedure . . . . . . . . . . . . . . . . . . . . . . . . 4-8
3.1.2 Service Program Mode Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
3.2 INPUT/OUTPUT CHECK MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
3.2.1 INPUT/OUTPUT CHECK MODE ACCESS PROCEDURE . . . . . . . . . . 4-27
3.2.2 INPUT CHECK MODE TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28
3.2.3 OUTPUT CHECK MODE TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29
3.3 POWER ON INITIAL SETTING MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30
4. JAM CODE LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
4.1 ACCESS PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
4.2 JAM CODE TABLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
5. SPECIAL TOOLS AND LUBRICANTS . . . . . . . . . . . . . . . . . . . . . 4-33
6. SERVICE REMARKS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34
6.1 DRUM UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34
6.1.1 Drum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34
6.2 CHARGE CORONA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-35
6.3 OPTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36
6.4 DEVELOPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36
6.5 TRANSFER AND SEPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37
6.6 CLEANING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37
6.7 FUSING UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38
6.7A PRESSURE ROLLER EVALUATION PROCEDURE . . . . . . . . . . . . . . . . . 4-38
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SM iii A163
6.8 ORIGINAL FEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39
6.9 PAPER FEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39
6.10 ROLL FEEDER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39
6.11 OTHERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39
REPLACEMENT AND ADJUSTMENT
1. EXTERIOR COVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
1.1 LEFT SIDE COVER REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
1.1.1 Left Upper Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
1.1.2 Left Lower Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
1.2 RIGHT SIDE COVER REMOVAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
1.2.1 Right Upper Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
1.2.2 Right Lower Front, Right Lower Middle, and Right Lower Rear Covers . . 5-1
1.3 REAR COVER REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
1.3.1 Rear Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
2. OPTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
2.1 ORIGINAL FEED UNIT REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
2.2 EXPOSURE GLASS REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
2.3 EXPOSURE LAMP REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
2.4 FIBER OPTICS ARRAY REMOVAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
2.5 LIGHT SENSOR REPLACEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
3. DEVELOPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
3.1 DEVELOPMENT UNIT REMOVAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
3.2 DEVELOPER REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
3.3 TONER DENSITY SENSOR REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . 5-9
3.4 PTL REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
3.5 DEVELOPMENT BIAS VOLTAGE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . 5-11
3.5.1 Bias Voltage for Image Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
3.5.2 Bias Voltage for Non-image Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
4. DRUM UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
4.1 DRUM UNIT REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
4.2 DRUM REPLACEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14
4.3 CLEANING BLADE REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
4.4 CHARGE CORONA UNIT REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
4.5 CHARGE CORONA WIRE REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
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4.6 PICK-OFF PAWL UNIT REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18
4.7 GRID VOLTAGE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19
4.8 DRUM CURRENT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
4.8.1 Charge Current Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22
4.8.2 Transfer Current Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23
4.8.3 Separation Current Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
5. FUSING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26
5.1 FUSING UNIT REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26
5.2 HOT ROLLER REPLACEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28
5.3 PRESSURE ROLLER REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-29
5.4 PRESSURE ROLLER THERMISTOR REPLACEMENT . . . . . . . . . . . . . . . . 5-30
5.5 PRESSURE ROLLER STRIPPER UNIT REPLACEMENT . . . . . . . . . . . . . . 5-30
5.6 HOT ROLLER STRIPPER UNIT REPLACEMENT . . . . . . . . . . . . . . . . . . . . 5-30
5.7 HOT ROLLER THERMISTOR REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . 5-31
5.8 FUSING THERMOFUSE REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . 5-31
5.9 FUSING TEMPERATURE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . 5-32
6. T & S CORONA UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-33
6.1 T & S CORONA UNIT REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-33
6.2 TRANSFER AND SEPARATION CORONA WIRE REPLACEMENT . . . . . . 5-34
6.2.1 Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-34
6.2.2 Separation Corona Wire Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 5-35
6.2.3 Transfer Corona Wire Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-35
7. OTHERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-36
7.1 OZONE FILTER REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-36
7.2 ANTICONDENSATION HEATER INSTALLATION . . . . . . . . . . . . . . . . . . . . 5-37
8. COPY QUALITY ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . 5-38
8.1 LIGHT SENSOR ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-39
8.2 IMAGE BIAS ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-40
8.3 TONER DENSITY ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-41
8.4 REGISTRATION ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-41
TROUBLESHOOTING
1. COPY QUALITY TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . 6-1
1.1 LOW IMAGE DENSITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Rev. 06/2004
SM v A163
1.2 UNEVEN COPY IMAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
1.3 DIRTY BACKGROUND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
1.4 BLACK LINE OR BAND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
1.5 ENTIRELY BLANK COPY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
1.6 PAPER CREASING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
2. SERVICE CALL CONDITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
2.1 SC Code E-1: Exposure Lamp Abnormal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
2.2 SC Code E-2: Fusing Thermofuse Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
2.3 SC Code E-3: Hot Roller Thermistor Open. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
2.4 SC Code E-4: Hot Roller Thermistor Short. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
2.5 SC Code E-5: Pressure Roller Thermistor Open . . . . . . . . . . . . . . . . . . . . . . . 6-8
2.6 SC Code E-6: Pressure Roller Thermistor Short . . . . . . . . . . . . . . . . . . . . . . . 6-9
2.7 SC Code E-7: Fusing Overheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
2.8 SC Code E-8: Fusing Warm-up Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
2.9 SC Code E-9: Toner Density Sensor Abnormal . . . . . . . . . . . . . . . . . . . . . . . 6-10
2.10 SC Code E-10: Main Motor Abnormal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
2.11 SC Code E-11: Toner Density Sensor adjustment Error . . . . . . . . . . . . . . . 6-11
3. BLOWN FUSE TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
3.1 POWER SUPPLY UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
ROLL FEEDER
1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
2. MECHANICAL COMPONENT AND DRIVE LAYOUT . . . . . . . . . 7-2
3. ELECTRICAL COMPONENT DESCRIPTIONS . . . . . . . . . . . . . . . 7-3
4. MECHANICAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
4.1 BASIC OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
4.2 CUTTER UNIT OPENING AND CLOSING MECHANISM . . . . . . . . . . . . . . . 7-6
4.3 CUTTER OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
5. SERVICE TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
5.1 TEST POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
5.2 BLOWN FUSE CONDITION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
6. INSTALLATION PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
7. REPLACEMENT AND ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . 7-16
Rev. 06/2004
A163 vi SM
7.1 EXTERIOR COVER REMOVAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
7.1.1 Front Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
7.1.2 Left and Right Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
7.2 CUTTER UNIT REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
7.3 PAPER FEED ROLLER REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18
7.4 PAPER FEED MOTOR TIMING BELT TENSION ADJUSTMENT . . . . . . . . 7-19
7.5 CUT LENGTH ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-20
7.5.1 Preset Cut : Adjustment standards: 3 mm (for length shorter than 420 mm)
5 mm (for 420 to 1189 mm)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-20
7.6 ROLL FEED PAPER SKEW ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . 7-21
Rev. 06/2004
SM vii A163
A251/A252
Service Manual
The A251/A252 machines are based on the A163 copier.
Only the differences from the base copier are described in the following pages.
Therefore, this documentation should be treated as an insert version of the base
copier’s service manual. It should always be utilized together with the base
copier’s service manual.
TOC i A251/A252
TABLE OF CONTENTS
1. OVERALL MACHINE INFORMATION
1.1 SPECIFICATIONS
1.2 PAPER PATH
1.4 MECHANICAL COMPONENT
1.5 DRIVE LAYOUT
1.6 ELECTRICAL COMPONENT DESCRIPTIONS
2. DETAILED SECTION DESCRIPTIONS
2.1 DRUM
2.1.2 DRUM DRIVE
2.3 EXPOSURE
2.3.2 PAPER AND ORIGINAL FEED (A252 ONLY)
2.4 DEVELOPMENT
2.4.2 TONER DENSITY CONTROL
2.8 FUSING AND PAPER EXIT
2.8.1 OVERVIEW (A252 COPIER)
3. INSTALLATION
3.1 INSTALLATION REQUIREMENTS
3.1.1 ENVIRONMENT
3.1.2 MINIMUM SPACE REQUIREMENTS
3.1.3 MACHINE LEVEL
3.1.4 POWER SOURCE
3.2 INSTALLATION PROCEDURES
3.2.1 COPIER
3.2.2 TABLE (A836)
3.2.3 COPY TRAY (A836-10)
3.2.4 ROLLER FEEDER (A571)
4. SERVICE TABLES
4.3 SERVICE TOOLS
4.3.1 SERVICE PROGRAM MODE
4.3.2 INPUT/OUTPUT CHECK MODE
4.4 JAM CODE LIST
4.4.2 JAM CODE TABLE
4.6 SERVICE REMARKS
4.6.12 AC DRIVE BOARD
5. REPLACEMENT AND ADJUSTMENT
5.2 OPTICS
5.2.1 ORIGINAL FEED UNIT REMOVAL (A252 ONLY)
5.2.2 EXPOSURE GLASS REMOVAL (A252 ONLY)
5.2.3 FIBER OPTICS ARRAY REMOVAL (A252 ONLY)
5.2.4 EXPOSURE LAMP REMOVAL
5.2.5 LIGHT SENSOR REPLACEMENT (A252 ONLY)
5.2.6 SYNCHRO-CUT LENGTH ADJUSTMENT (A252 ONLY)
5.4 DRUM UNIT
5.4.1 DRUM UNIT REMOVAL
A251/A252 ii TOC
5.5 FUSING
5.5.1 FUSING UNIT REMOVAL
5.6 T & S CORONA UNIT
6.5.1 TRANSFER AND SEPARATION CORONA WIRE REPLACEMENT
5.8 COPY QUALITY ADJUSTMENT
5.8.4 REGISTRATION ADJUSTMENT
6. TROUBLESHOOTING
6.2 SERVICE CALL CONDITIION
6.2.12 SC CODE E-14: ZERO CROSS SIGNAL DETECTION ABNORMAL
6.2.13 SC CODE E-15: MAIN SWITCH ABNORMAL (U.S.A. VERSION ONLY)
6.3 BLOWN FUSE TABLE
6.3.1 POWER SUPPLY UNIT
MECHANICAL COMPONENT
A251/A252 1-4 SM
1.4 MECHANICAL COMPONENT
1. 1st Original Feed Roller
2. 1st Press Rollers
3. Copy Tray
4. Exit Rollers
5. Fusing Exit Rollers
6. Hot Roller
7. Pressure Roller
8. Gas Spring
9. OPC Drum
10. T/S Corona Unit
11. Main Drive Unit
12. Table
13. Paper Spool
14. Roll Feeder
15. Paper Registration Rollers
16. Development Unit
17. Toner Cartridge
18. Manual Feed Table
19. Charge Corona Unit
20. 2nd Original Feed Roller
21. Original Table
22. 2nd Original Press Roller
23. Exposure Lamp
24. Fiber Optic Array
25. Cleaning Blade
A252V502.PCX
25 1 2
24 23 22 21
B047/B048
SERVICE MANUAL
Insert Version
The B047/B048 machines are based on the A163/A251/A252 copiers.
Only the differences from the base copier are described in the following pages.
Therefore, this documentation should be treated as an insert version of the base
copier’s service manual. It should always be utilized together with the base
copier’s 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 SPECIFICATIONS
1.2 PAPER PATH
1.3 DRUM PROCESSES
1.4 MECHANICAL COMPONENTS
1.5 DRIVE LAYOUT
1.6 ELECTRICAL COMPONENTS
DETAILED SECTION DESCRIPTIONS
2. DETAILED SECTION DESCRIPTIONS
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
2.3.1 OVERVIEW
2.3.2 PAPER AND ORIGINAL FEED (B048 ONLY)
Basic Operation (Manual Feed)
Original Jam Check Timing
Drive Mechanism
Original Positioning
Scanning
Start Key Enable
2.3.3 FL REGULATOR CONTROL
2.3.4 MANUAL ID CONTROL
Manual ID Control
2.4 DEVELOPMENT
2.4.1 OVERVIEW
2.4.2 DRIVE MECHANISM
2.4.3 CROSS-MIXING
2.4.4 TONER DENSITY CONTROL
Toner Near End Condition
B047/B048 ii SM
Recovery from Toner End Condition
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
2.7 QUENCHING
2.8 FUSING AND PAPER EXIT
2.8.1 OVERVIEW
2.8.2 DRIVE MECHANISM
Fusing Unit Drive
2.8.3 TEMPERATURE CONTROL
Fusing Circuit Operation
Overheat Protection
Hot Roller Temperature Control
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)
INSTALLATION
3. INSTALLATION
3.1 INSTALLATION REQUIREMENTS
3.1.1 ENVIRONMENT
3.1.2 MINIMUM SPACE REQUIREMENTS
3.1.3 MACHINE LEVEL
3.1.4 POWER SOURCE
3.2 INSTALLATION PROCEDURE
3.2.1 COPIER
Accessory Check
B048 copier only (step 21)
B047 copier only (step 22 and 23)
SM iii B047/B048
Both copiers (step 24 and 25)
3.2.2 TABLE (B439)
Accessory Check
3.2.3 COPY tray (B440)
Accessory Check
3.2.4 ROLL FEEDER1 and 2 (B435/b436)
Accessory Check
3.2.5 Roll Cutting Rail (B437)
SERVICE TABLES
4. SERVICE TABLES
4.1 PREVENTIVE MAINTENANCE SCHEDULE
4.1.1 PM TABLE
4.1.2 REGULAR PM PROCEDURE
4.2 SERVICE TABLES
4.2.1 TEST POINTS
Main Board
Charge/Bias/Grid Power Pack
4.2.2 VARIABLE RESISTORS
Charge/Bias/Grid Power Pack
T&S Power Pack
4.3 SERVICE TOOLS
4.3.1 SERVICE PROGRAM MODE
Service Program Mode Access Procedure
Service Program Mode Table
4.3.2 INPUT/OUTPUT CHECK MODE
Input/Output Check Mode Access Procedure
Input Check Mode Table
Output Check Mode Table
4.3.3 POWER ON INITIAL SETTING MODE
4.4 JAM CODE LIST
4.4.1 ACCESS PROCEDURE
4.4.2 JAM CODE TABLE
Fixed Paper Size Pattern Data (SP No. 22)
Default Settings for Each Destination (SP#-1)
4.5 SPECIAL TOOLS AND LUBRICANTS
4.6 SERVICE REMARKS
4.6.1 DRUM UNIT
4.6.2 CHARGE CORONA
4.6.3 OPTICS
4.6.4 DEVELOPMENT
4.6.5 TRANSFER AND SEPARATION
4.6.6 CLEANING UNIT
4.6.7 FUSING UNIT
4.6.8 ORIGINAL FEED
B047/B048 iv SM
4.6.9 PAPER FEED
4.6.10 ROLL FEEDER
4.6.11 OTHERS
4.6.12 AC DRIVE BOARD
Service Remark for 220 ~ 240 V Version
Service Remarks for 120 V Version
REPLACEMENT AND ADJUSTMENT
5. REPLACEMENT AND ADJUSTMENT
5.1 EXTERIOR COVERS
5.1.1 LEFT SIDE COVER REMOVAL
Left Upper Cover
Left Lower Cover
5.1.2 RIGHT SIDE COVER REMOVAL
Right Upper Cover
Right Lower Front, Right Lower Middle, and Right Lower
Rear Covers
5.1.3 REAR COVER REMOVAL
Rear Cover
5.2 OPTICS
5.2.1 ORIGINAL FEED UNIT REMOVAL (A252 ONLY)
5.2.2 EXPOSURE GLASS REMOVAL (A252 ONLY)
5.2.3 EXPOSURE LAMP REMOVAL (A252 ONLY)
5.2.4 FIBER OPTICS ARRAY REMOVAL (A252 ONLY)
5.2.5 LIGHT SENSOR REPLACEMENT (A252 ONLY)
5.2.6 SYNCHRO-CUT LENGTH ADJUSTMENT (A252 ONLY)
5.3 DEVELOPMENT
5.3.1 DEVELOPMENT UNIT REMOVAL
5.3.2 DEVELOPER REMOVAL
5.3.3 TONER DENSITY SENSOR REPLACEMENT
5.3.4 PTL REPLACEMENT
5.3.5 DEVELOPMENT BIAS VOLTAGE ADJUSTMENT
Bias Voltage for Image Area
Bias Voltage for Non-image Area
5.4 DRUM UNIT
5.4.1 DRUM UNIT REMOVAL
5.4.2 DRUM REPLACEMENT
5.4.3 CLEANING BLADE REPLACEMENT
5.4.4 CHARGE CORONA UNIT REMOVAL
5.4.5 CHARGE CORONA WIRE REPLACEMENT
5.4.6 PICK-OFF PAWL UNIT REMOVAL
5.4.7 GRID VOLTAGE ADJUSTMENT
5.4.8 DRUM CURRENT ADJUSTMENT
Charge Current Adjustment
Transfer Current Adjustment
Separation Current Adjustment
SM v B047/B048
5.5 FUSING
5.5.1 FUSING UNIT REMOVAL
5.5.2 HOT ROLLER REPLACEMENT
5.5.3 PRESSURE ROLLER REPLACEMENT
5.5.4 PRESSURE ROLLER THERMISTOR REPLACEMENT
5.5.5 PRESSURE ROLLER STRIPPER UNIT REPLACEMENT
5.5.6 HOT ROLLER STRIPPER UNIT REPLACEMENT
5.5.7 HOT ROLLER THERMISTOR REPLACEMENT
5.5.8 FUSING THERMOFUSE REPLACEMENT
5.5.9 FUSING TEMPERATURE ADJUSTMENT
5.6 T & S CORONA UNIT
5.6.1 T & S CORONA UNIT REMOVAL
5.6.2 TRANSFER AND SEPARATION CORONA WIRE
REPLACEMENT
Preparation
Separation Corona Wire Replacement
Transfer Corona Wire Replacement
5.7 OTHERS
5.7.1 OZONE FILTER REPLACEMENT
5.7.2 ANTICONDENSATION HEATER INSTALLATION
5.8 COPY QUALITY ADJUSTMENT
5.8.1 LIGHT SENSOR ADJUSTMENT
5.8.2 IMAGE BIAS ADJUSTMENT
5.8.3 TONER DENSITY ADJUSTMENT
5.8.4 REGISTRATION ADJUSTMENT
TROUBLESHOOTING
6. TROUBLESHOOTING
6.1 COPY QUALITY TROUBLESHOOTING
6.1.1 LOW IMAGE DENSITY
6.1.2 UNEVEN COPY IMAGE
6.1.3 DIRTY BACKGROUND
6.1.4 BLACK LINE OR BAND
6.1.5 ENTIRELY BLANK COPY
6.1.6 PAPER CREASING
6.2 SERVICE CALL CONDITIONS
6.2.1 SC CODE DESCRIPTIONS
SC Code E-1: Exposure Lamp Abnormal
SC Code E-2: Fusing Thermofuse Open
SC Code E-3: Hot Roller Thermistor Open
SC Code E-4: Hot Roller Thermistor Short
SC Code E-5: Pressure Roller Thermistor Open
SC Code E-6: Pressure Roller Thermistor Short
SC Code E-7: Fusing Overheat
SC Code E-8: Fusing Warm-up Error
SC Code E-9: Toner Density Sensor Abnormal
B047/B048 vi SM
SC Code E-10: Main Motor Abnormal
SC Code E-11: Toner Density Sensor Adjustment Error
SC Code E-13: Total Counter Abnormal
SC Code E-14: Zero Cross Signal Detection Abnormal
SC Code E-15: Main Switch Abnormal
SC Code E-17: Unstable Fusing Temperature
SC Code E-18: Fusing Lamp Continuous Light
6.3 BLOWN FUSE TABLE
6.3.1 POWER SUPPLY UNIT
Europe Version
U.S.A. Version
AC Drive Board
ROLL FEEDER UNIT B435/B436
1. OVERALL MACHINE INFORMATION
1.1 SPECIFICATIONS
1.2 ELECTRICAL COMPONENT DESCRIPTIONS
2. DETAILED SECTION DESCRIPTIONS
2.1 MECHANICAL OPERATION
2.1.1 BASIC OPERATION
2.1.2 ROLL EDITION DETECTION
2.1.3 DRIVE MECHANISM
2.1.4 CUTTER OPERATION
3. REPLACEMENT AND ADJUSTMENT
3.1 CUTTER UNIT REPLACEMENT
3.2 ROLL FEED LEADING EDGE SENSOR REPLACEMENT
3.3 ROLL FEED UNIT REMOVAL
3.4 ROLL FEED CLUTCH REPLACEMENT
3.5 ROLL FEED MOTOR REPLACEMENT
3.6 ROLL END SENSOR REPLACEMENT
3.7 CUT LENGTH ADJUSTMENT
Preset Cut : Adjustment standards: 3 mm (for Length Shorter
than 420 mm) 5 mm (for 420 to 1,189 mm) 11 mm
(3,000 mm)
3.8 SIDE REGISTRATION ADJUSTMENT
TECHNICAL SERVICE BULLETINS
A163/A251/A252/B047/B048
PARTS CATALOG
001316MIU
LEGEND
PRODUCT CODE COMPANY
GESTETNER RICOH SAVIN
A163 N/A FW740 N/A A251 N/A FW750 N/A A252 N/A FW760 N/A B047 A040 FW770 7700W B048 A041 FW780 7800W A571 Roll Feeder A570 Roll Cutting Rail A714 Table A836 Table/Copy Tray
B435/B436 Roll Feeder Type A/B
B437 Roll Cutting Rail Type 770 B439 Table type 770 B440 Copy Tray Type 780
DOCUMENTATION HISTORY
REV. NO. DATE COMMENTS
* 12/94 Original Printing
1 6/98 A251/A252 Addition 2 8/2001 B047/B048 Addition


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