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Technical Bulletin

No. RTB-012

SUBJECT: Off-set Image Problem

DATE: Dec. 31, ’93
PAGE: 1 of 2

PREPARED BY: S. Orita
CHECKED BY:

FROM: 2nd Technical Support Section

CLASSIFICATION:

Action Required
Troubleshooting
Retrofit Information

Revision of service manual
Information only
Other

MODEL: E7 series

(A076/A077)

(Phenomenon)
Toner sticks to the hot roller and then is transferred to the copy paper from the hot roller
forming an off-set image.

(Cause)
This problem may or may not occur depending on the type of copy paper used. If the dust
from the copy paper contains a large amount of calcium carbonate, it tends to adhere to
the graphite in the teflon layer of the hot roller. If that happens toner sticks and gradually
accumulates at the same place on the hot roller. The greater the amount of the calcium
carbonate containing the copy paper, the more easily the toner sticks to the hot roller.

(Solution)
It is difficult to control the type of paper used and more kinds of paper including recycled
paper, which contains more additives, will be used in the future. Therefore, we have
decided to remove the graphite from the hot roller in order to expand the tolerance to
paper types and reduce the toner sticking problem.
The cut-in serial number of this change is as follows:

Machine Code

Cut-in Serial

Number

Machine Code

Cut-in Serial

Number

A076-10

2913110001

A077-10

2933100001

A076-15

3030110001

A077-15

5131000001

A076-16

2913100001

A077-16

2933100021

A076-17

A2943100001

A077-17

A2953100151

A076-19

A2944010426

A077-19

A295403XXXX

A076-22

2903100001

A077-22

2923120001

A076-25

2903100424

A077-25

2923100001

A076-26

3B71030001

A077-26

3B81030001

A076-27

A2943100348

A077-27

A2953110001

A076-28

A2943121414

A077-28

A295403XXXX

A076-29

A2944010625

A077-29

A2953100021

Reissued on March 31 ’94

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Содержание A076-10

Страница 1: ... can now be reset two ways by opening and closing the front cover or by opening and closing the paper tray Previously opening and closing the paper tray had no effect 2 The VL correction factor is newly added to the exposure lamp voltage control Refer to page 2 19 of the service manual VL Correction Factor The light intensity may decrease because of dust accumulated on the optics parts The exposur...

Страница 2: ...rker SP34 0 or 1 Lighter SP34 2 K TL1 160 200 TL1 K TL2 200 240 TL2 K TL3 240 280 TL3 K TL4 280 320 TL4 K TL5 320 360 TL5 K 360 400 Increase of the exposure lamp data 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 TL1 0 80 0 85 0 90 0 95 1 00 1 05 1 11 1 16 1 20 1 23 TL2 0 75 0 80 0 84 0 88 0 92 0 97 1 01 1 06 1 11 1 16 TL3 0 70 0 74 0 78 0 82 0 86 0 90 0 94 0 99 1 03 1 08 TL4 0 61 0 65 0 69 0 ...

Страница 3: ... once the drum is replaced Action Required Perform the drum initial setting by SP66 to clear the OPC counter when installing the copier If the copier has been installed already do not perform the drum initial setting Use the Total Copies SP103 instead of the OPC Counter SP69 to monitor the total number of copies made with the drum Units Affected Model Code Units Affected A076 25 S N 2902030133 and...

Страница 4: ...accessory to the E7 DF A365 from the July production The cut in serial numbers will be informed by the MB Contents of the Kit Upper Unit Stand P N A3651485 1pc Magnet P N A3651486 1pc Instruction Decal P N A3652080 1pc Stepped Screw long P N 54465832 1pc Stepped Screw short P N AA143183 1pc Screw driver P N A3656001 1pc When the DF is installed to the copier in the field this kit should also be in...

Страница 5: ... keep the upper unit open as shown in the illustration 4 After a paper misfeed removal replace the upper unit stand in its original position New DF Installation Procedure The new DF installation procedure is as follows CAUTION When installing the DF make sure that the copier is unplugged 1 Remove the platen cover A from the copier 2 Remove the strips of tape from the DF A ...

Страница 6: ...opier upper cover 4 Secure the DF to the copier 2 thumb screws D 5 Remove the seal E from the outlet of the copier 6 Plug in the optics fiber cable F to the DF and the copier as shown 7 Plug in the power supply cord G of the DF to the outlet of the copier rear cover as shown 8 Install the original table H as shown B C D E F G H ...

Страница 7: ... 11 Remove 2 screws I 12 Tighten the shorter stepped screw J 13 Install the upper unit stand K 1 longer stepped screw L 14 Stick the magnet M as shown 15 Stick the decal N as shown 16 Close the upper unit and the front cover 17 Check the operation of the DF 18 Instruct key operators how to use the upper unit stand I J K L I M M N ...

Страница 8: ...evelopment unit cleaning unit or drum unit is removed from the machine the upper unit becomes lighter If the upper unit is released under this condition it tends to open very abruptly The service engineer might be injured if he is leaving over the machine at this time Also the machine might move due to the shock of the upper unit opening abruptly To avoid possible injury or machine damage the serv...

Страница 9: ...nual ID Level 1 2 3 4 5 6 7 Base Bias Voltage volts 120 160 160 160 160 200 240 Note Exposure Lamp Data Grid Voltage volts Vo 4 Vg 0 Vo 4 Vg 0 Vo 2 Vg 0 Vo 0 Vg 0 Vo 2 Vg 0 Vo 2 Vg 50 Vo 4 Vg 50 Correct Manual ID Level 1 2 3 4 5 6 7 Base Bias Voltage volts 120 160 160 160 160 200 240 Note Exposure Lamp Data Grid Voltage volts Vo 4 Vg 0 Vo 4 Vg 0 Vo 2 Vg 0 Vo 0 Vg 0 Vo 2 Vg 0 Vo 2 Vg 50 Vo 4 Vg 50 ...

Страница 10: ...vel 1 2 3 4 5 6 7 Base Bias Voltage volts 120 160 160 160 160 200 240 Note Exposure Lamp Data Grid Voltage volts Vo 4 Vg 0 Vo 4 Vg 0 Vo 2 Vg 0 Vo 0 Vg 0 Vo 2 Vg 0 Vo 2 Vg 50 Vo 4 Vg 50 Vo Exposure Lamp Data for ID level 4 SP48 Vg Standard Image Grid Voltage 680 volts 2 Service Manual Page 2 18 Sensing measurement for ADS mode The correction is bolded Incorrect Correct 1 Sampling starts 10 millimet...

Страница 11: ...lletin No RTB 005 SUBJECT Service Manual Correction DATE July 15 92 PAGE 2 of 4 3 Service Manual Point to Point Directions of arrows are reversed The correction is circled Reissued on August 31 92 Incorrect Correct ...

Страница 12: ...Technical Bulletin No RTB 005 SUBJECT Service Manual Correction DATE July 15 92 PAGE 3 of 4 Reissued on August 31 92 Incorrect Correct Incorrect Correct ...

Страница 13: ...the SP111 if you enter the SP mode by key operation 2 Access to SP111 3 Press and hold the Interrupt key 4 Select the desired number 1 or 2 1 Paper Feed 2 Exit by the Quantity Increase or Decrease key while holding the Interrupt key and then release the Interrupt key 5 Press the ADS key 111 will blink and then press the ADS key again 6 The first two digits for the number of misfeeds are displayed ...

Страница 14: ...ocedure 1 Remove the following covers Upper rear cover 2 screws Lower rear cover 2 screws AC drive board cover 2 screws 2 Enter SP51 and check whether the exposure lamp data becomes 126 or not If yes go to step 3 If no exit SP51 and enter SP48 Adjust the SP48 data using the Increase or Decrease key to display 126 in SP51 then exit SP48 3 Turn off the main switch 4 Set the multimeter range to ac 20...

Страница 15: ...Intensity Adjustment See service manual page 5 82 NOTE The exposure lamp voltage can be adjusted by SP48 Shifting SP48 by one will shift the voltage as follows 115 V machine about 0 5 volt 220 230 240 V machine about 1 volt However if VR401 is not adjusted properly this voltage shift is changed As a result the exposure lamp corrections VL correction VR correction drum temperature correction reprod...

Страница 16: ... copies as follows Phenomenon 1 Bent image The bent image appears at around 50 mm from the trailing edge of copy paper as shown 2 Paper skewing The rear side of the copy paper feeds ahead of the front side and skewed images appear on copies as shown In addition when paper skewing appears as described above lines also may be bent at around 50 mm from the trailing edge of the copy paper Rear Front P...

Страница 17: ...ressure lever does not move up and down smoothly and or the paper feed unit position is not parallel to the OPC drum position 2 Paper skewing The paper feed unit position is not parallel to the OPC drum position 3 Optical skewing The 4th 5th mirror position is not parallel to the OPC drum position Copy paper Copy image Vertical lines on the copy im age are parallel to the edge the copy paper Paper...

Страница 18: ...he front and rear pressure springs A and B from b to a as shown below 3 Close the exit cover 4 Open the upper unit 5 Apply the Mobil Temp 78 to the area between the front side fusing pressure lever C and fusing unit side frame as shown below CAUTION Make sure not to bend the lever 6 Close the upper unit and check the copy quality NOTE If the bent image still appears check for paper skewing and per...

Страница 19: ...age confirm the following items 1 The copier is placed on a flat table 2 The leading edge of the original is aligned with the left scale 3 When the copy paper is loaded into the paper tray confirm that the front rear and end guides of the paper tray securely hold the paper Check that the copy image is within specification as shown 200 mm A B Less than 1 5 mm Paper feed direction Copy paper Copy im...

Страница 20: ...itch and unplug the power supply cord 2 Remove the DF if installed 3 Remove the paper tray 4 Open the front cover 5 Open the upper unit by pushing the release lever 6 Remove the harness cover A 2 screws 7 Remove the lower rear cover 2 screws 8 Loosen the two front screws B and one rear screw C securing the paper feed unit D A B C D Reissued on Dec 15 92 ...

Страница 21: ...shown b Tighten the screw F while pushing the front side of the paper feed unit to the drum unit side as shown Then tighten the other screw G 10 Reinstall all covers and units 11 Check the copy quality NOTE When paper skewing is corrected the bent image at around 50 mm from the trailing edge is also corrected If the finer adjustment is required follow method B E Front side of the paper feed unit F...

Страница 22: ... 92 PAGE 7 of 10 Method B 1 Follow steps 1 to 7 of method A 2 Remove the DC power supply unit A 4 screw and all connectors 3 Remove three clutch connectors B 4 Remove the rear side plate C 4 screws 6 wire clamps and 1 connector 5 Remove the timing belt tightener D 1 spring E A B D E C Reissued on Dec 15 92 ...

Страница 23: ...from the pulley 7 Remove two connectors G from the paper feed unit H 8 Remove the paper feed unit 4 screws 9 Cut and file the front positioning pin I of the paper feed unit NOTE File the front positioning pin until it is even with the bottom plate J 10 File the front screw holes K of the paper feed unit as shown G F H I I J J K 2 mm Reissued on Dec 15 92 ...

Страница 24: ...hown Then secure the other screw O NOTE When sliding the front side of the paper feed unit to the drum unit side make sure that the paper feed unit does not overlap the screw P securing the earth plate 12 Reinstall all covers and units 13 Check the copy quality If the paper now skews in the opposite direction front side of copy paper feeds ahead push the front side of the paper feed unit to the ma...

Страница 25: ... image are not parallel to the edge of the copy paper follow the adjustment for optical skewing 3 Optical skewing Adjust the 4th 5th mirror height This adjustment is described in the service manual on page 5 95 NOTE This adjustment should be performed after the vertical lines on the copy image are parallel to the edge of the copy paper Reissued on Dec 15 92 ...

Страница 26: ...l Magnification Adjustment The correction is bolded Incorrect Correct Adjustment Standard Adjustment Standard Less than 0 8 40 difference Less than 0 5 difference between original and copy 2 Service Manual Page 5 89 Adjustment Standard for Vertical Magnification Adjustment The correction is bolded Incorrect Correct Adjustment Standard Adjustment Standard Less than 0 8 difference Less than t 1 0 di...

Страница 27: ...e correction is bolded Incorrect Correct 2 Turn on the main switch front 2 Turn on the main switch front cover safety switch and grid cover safety switch and using SP9 38 development bias using SP9 38 3 Adjust the grid voltage to 3 Adjust the development bias 500 10 V by turning VRB on voltage to 500 10 V by turning the CC Grid Bias power pack VRB on the CC Grid Bias power A pack A ...

Страница 28: ...on is applied until 160 Note The total corrections for the exposure lamp VL correction VR correction Drum temperature correction Reproduction ratio correction are applied until 170 This is the same as that of the old ROM 2 New procedure for accessing of SP111 Number of misfeeds by location A076 copier only The previous access procedure of SP111 for the A076 copier is explained in E7 RTB No 5 The f...

Страница 29: ...s been changed so that the DF motor is energized after the previous original scanning is completed The cut in serial numbers for the new ROM A0775105A are as follows Machine Code Cut in Serial number A076 10 291303XXXX A076 15 3021000001 A076 16 2913010001 A076 17 A2942101135 A076 19 A294303XXXX A076 22 2902100001 A076 25 2902100140 A076 26 3B71020001 A076 27 A2942100001 A076 28 A2943030569 A076 2...

Страница 30: ...per feeds One part of the torque roller surface gets worn out and J1 misfeeds occur Solution The inner diameter of the slip clutch spring has been decreased from 15 80 mm to 15 84 mm so that the slip torque of the slip clutch is decreased refer to E7 MB No 8 As a result the amount of decrease of the feed roller diameter has been smaller and the expected lifetime of the torque roller is now more th...

Страница 31: ...mmediately stops and a paper misfeed might occur This is to prevent the key counter from being removed before the key counter counts up For the above reason a coin lock cannot be used with the old ROM Solution At the field s request the ROM has been changed to permit use the coin lock According to this change the machine can be set so that no paper misfeed occurs even if the key counter is removed...

Страница 32: ...er size is detected properly The cut in serial numbers for the new ROM A0775105B are as follows Machine Code Cut in Serial number A076 10 291309XXXX A076 15 303090XXXX A076 16 2913070001 A076 17 A294309XXXX A076 19 A294309XXXX A076 22 2903080001 A076 25 2903060050 A076 26 3B70830001 A076 27 A2943070001 A076 28 A2943060001 A076 29 A2943060021 A077 10 2933040081 A077 15 5130500001 A077 16 2933040001...

Страница 33: ...ium carbonate containing the copy paper the more easily the toner sticks to the hot roller Solution It is difficult to control the type of paper used and more kinds of paper including recycled paper which contains more additives will be used in the future Therefore we have decided to remove the graphite from the hot roller in order to expand the tolerance to paper types and reduce the toner sticki...

Страница 34: ...t roller has not been changed only a suffix change To distinguish the new hot roller from the old one a red mark or an extra groove has been added to the rear edge of the new hot roller as shown The new hot roller has been stocked in SPC since the end of August C ring groove A red mark or an extra groove has been added here Rear New Hot Roller Reissued on March 31 94 ...

Страница 35: ...bracket properly As a result service code E52 may be displayed because of an incorrect gap between the thermoswitch and the hot roller To prevent this a note on thermoswitch bracket installation has been added to the FUSING THERMOSWITCH REPLACEMENT procedure Please correct your service manual page 5 77 Service Manual Page 5 77 7 6 FUSING THERMOSWITCH REPLACEMENT 1 Turn off the main switch and unpl...

Страница 36: ...ver A 1 screw 7 Remove the thermoswitch bracket B 1 screw 8 disconnect two thermoswitch connectors C 9 Remove the thermoswitch D from the bracket 2 screws NOTE When installing the thermoswitch bracket E make sure that the projection F on the thermoswitch bracket enters into the hole G on the fusing unit frame H G H F E This is newly added ...

Страница 37: ...raphite from the hot roller last year to reduce the toner sticking problem P N AE011009B C To further increase the tolerance to the problem this time we have changed the kind of Teflon coating of the hot roller With this change pin holes on the hot roller surface which hook the mixture of toner particles and paper additives have been reduced and the roller surface has become more smooth Old P N Ne...

Страница 38: ... to the main body with two hinge shafts P N 52161374 and two retaining rings P N 07200025E P N Description A0771355 Platen Cover Ricoh A0776354 Platen Cover Gestetner A0776355 Platen Cover Nashua A0776356 Platen Cover NRG A0776755 Platen Cover Savin A0776155 Platen Cover Infotec However the previous type covers are no longer available Though the part numbers for the covers remain unchanged the par...

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