Canon NP6251 Service Bulletin Download

Page: 39 / 67

6251-014 Rev. 2

2 / 3 -

<Procedure>
1.

Install the new parts as shown in the figure below (Fig. 2). This part is called the high voltage
connector unit.

•

Insert the shaft section of the flag (FB2-8521) into the hole (2mm diameter) of the flag holder
(FB2-8520).

•

Be sure the installation direction of the microswitch of the high-voltage SW cable (FG6-3420) is
correct.

•

After installing all new parts, check that the flag (FG2-8521) moves smoothly and presses the
microswitch.

Remove the fixing/waste toner drive assembly. (See the Service Manual for details of how to
remove the unit.)

Remove the high voltage connector unit.

4. Install the high voltage connector unit at the place where the transfer high voltage connector was

installed.

5. Remove the connector J780 of the waste toner relay cable (FG5-5045-000) connected to the

microswitch (MSW4) for the waste toner feedscrew locking condition. (See Fig. 3.)

6. Connect the cable connected to the microswitch of the high voltage connector unit between the two

middle connectors of the connector J780 (which were formerly directly joined) removed in Step 5.
(See Fig. 3.)

7. Reinstall the removed parts at their original locations.

Fig. 3 Microswitch wiring

High voltage connector unit

High voltage connector

[Old]

[New]

Fig. 2 High voltage connector

FH2-9230

FB2-8520

J780

FB2-8521

Connector here is
connected between
the two middle
connectors of the
connector J780

XB1-2400-609

FG6-3420

MSW4

FG5-5045

Summary of Contents for NP6251

Page 1: ...und wire After replacing the lens stage attach the cable following the same path as before so that the movement of the lens stage is not affected 4 Move the mirror 1 mount to the left direction 5 Remove the light blocking curtain 3 in Figure 1 2 locations The light blocking curtain is pasted to the lens with two sided tape be careful when peeling off the light blocking curtain so as to avoid teari...

Page 2: ...time the tip of the screwdriver must go through the oval hole on the cam plate located under the side hole See Figures 4 and 5 2 4 6251 001 Fig 2 Lens stage cable enlargement Fig 3 Light blocking curtain enlargement Fig 4 Lens stage Fig 5 Detailed side hole section Cable clamp Ground cable Jeweler s screwdriver Lens Side hole section Cam plate Cam plate oval hole Lens round hole 2 mm in diameter C...

Page 3: ...d part of Figure 8 against the side of the rail toward the lens 7 After attaching the removed parts turn the power switch ON and check the image for DIRECT copying If good resolution is not obtained repeat Steps 1 to 6 again When good resolution is obtained bond lock the cam plate fixing screw Fig 8 Fixing cam shaft Fig 6 Lens stage Fig 7 Positional relationship of round hole and oval hole when th...

Page 4: ...ghten the fixing screw See Figure 9 Check images again and if the lens still fails to yield good resolution bend the rail in the opposite direction When good resolution is obtained bond lock the lens rail fixing screw Fig 9 Lens rail Service Parts NP6251 P C 210 Old New Old 1 New No Description Part number Q ty 0 1 FG5 9408 000 Stage lens Inter change ability 1 Y direction Rail fixing screw 200 en...

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Page 6: ...henomenon Paper pick up fault Cause The sponge part of the separation roller becomes damaged because of a decrease in durability Factory measures A bearing has been added to the separation roller support Measures for servicing If the above phenomenon occurs replace the parts below or the deck pick up assembly 1 3 FB2 7602 000 replace New part Old part Deck right pick up assembly FF5 3213 000 repla...

Page 7: ... Arm roller Arm roller Shaft separation Shaft separation Spring tension Spring tension Bearing Deck right pick up ass y Deck right pick up ass y Inter change ability 1 1 1 1 No Yes 1 Interchangeable by replacing all 4 parts at the same time FB2 7709 000 replace XD2 1100 402 eliminated FB3 9207 000 FF5 6397 000 XG9 0243 000 new FB3 9207 000 FS6 2678 000 FB2 7709 000 replace FS5 2984 000 replace FF5...

Page 8: ... 5804 000 FG5 5804 120 Arm separation left Arm separation Shaft separation Shaft separation Spring tension Spring tension Ring E Bearing Deck left pick up assembly Deck left pick up assembly Inter change ability 2 2 2 2 2 No Yes Affected Machines LPS version Deck right pick up assembly CJB 00001 and later DJB 00001 and later Deck left pick up assembly CJB 01881 and later DJB 00571 and later 313 16...

Page 9: ...the fixing assembly waste toner drive assembly this pulley has been changed to a stronger type Details Phenomenon Jamming of the paper reaching the fixing assembly Cause Cracking of the 49T pulley of the fixing assembly waste toner drive assembly Factory measures The 49T pulley has been changed to a stronger type Old New Fig 49T pulley Servicing When the aforementioned phenomenon occurs replace th...

Page 10: ...80 13 New PULLEY 49T FS6 0864 000 0 1 2 Old WASTE TONER DRIVE ASSEMBLY FG5 8721 070 1 0 280 New WASTE TONER DRIVE ASSEMBLY FG5 8721 080 0 1 Affected machines Japanese version NP6251 NHU00039 and later NGT00005 and later NJE00001 and later Affected machines LPS version NP6251 CJB00701 and later DJB00283 and later No Yes No Yes ...

Page 11: ...above symptom Factory measure 1 A circuit to remove the noise has been added to the holding tray driver PCB 2 Grounding wire has been added to the side cable 3 Grounding wire has been added to the motor cable 4 Grounding wire has been added to the connect cable Servicing Replace all the parts shown below simultaneously when the above symptom occurs Item Part Number Quantity Remarks HOLDING TRAY DR...

Page 12: ...d from the side guide mount The method for installing cables is described on the next page Fig 1 Location for replacement parts Additional part Holding tray assembly Side guide mount Side guide plate rear assembly Additional Tighten the ground wire terminal of the connect cable along with the screw Side cable Tighten the ground wire terminal of the motor cable along with the screw Motor cable Conn...

Page 13: ... to the side guide mount see Fig 3 Mount the side guide plate rear to the side guide mount Be sure to insert the motor cable into the place as shown circled in Fig 3 Mount the side cable to the side guide mount Temporarily clamp the cable ties at three locations and insert them into the respective holes in the side guide mount Tighten the cable ties while avoiding too much slack in cable cut exces...

Page 14: ...IVER PCB ASS Y FG5 8758 000 1 0 335 21 New HOLDING TRAY DRIVER PCB ASS Y FG5 8758 020 0 1 5 Old SIDE LIMIT ASS Y FG5 4422 040 1 0 338 New SIDE LIMIT ASS Y FG5 4422 070 0 1 6 Old HOLDING TRAY ASSEMBLY FG5 8666 000 1 0 338 New HOLDING TRAY ASSEMBLY FG5 8666 110 0 1 1 Interchangeable only when all the parts are replaced simultaneously Side cable Locking wire saddles locations parts Motor cable 1 1 1 ...

Page 15: ...6251 005 Rev 1 5 5 Affected machines NHU 00081 and later NGT 00005 and later NJE 00161 and later Affected machines LPS version NP6251 CJB 15406 and later DJB 11456 and later ...

Page 16: ...t is set using COPY_LIM in service mode 5 Version 7 accepts such an input but displays an alarm message in response to a press on the Copy key prompting the user to enter an appropriate number for the number of copies to request 3 Changing the method of counting two sided copies The method of counting two sided copies for the Copy Data Controller A1 has been changed so that the total copy count is...

Page 17: ...wing changes have been made to comply with the requirements of Energy Star Tire2 1 Default mode is now from one sided original to one sided copy instead of from one sided original to two sided copy However default mode for Inch configuration remains the same as from one sided original to two sided copy The notation 2SIDE_SL in service mode 5 is disabled and dimmed 2 New function which enables a sw...

Page 18: ...able as a Temporary Measure A DIP switch DIPSW 102 consisting of two circuits has been added to the existing DC controller PCB Compliance Non Compliance with Energy Star Tire2 Note that bit 2 is not used ON 1 2 SW102 DC Controller PCB for temporary use DC Controller PCB Available as a Permanent Measure The change made provides four circuits instead of three for a DIP switch DIPSW101 on the DC Cont...

Page 19: ...an ID number acceptance has been already made This problem has been corrected 6 Correcting a message The jam icon appearing in front of the message Insert Control Card has been removed 7 Correcting a bug If the Start key is pressed for a single original in from one sided original to two sided copy mode using the RDF the machine indicates the message Place Two or More Originals and stops while issu...

Page 20: ...arts No Description Part number Q ty Inter change ability P C 1 Old EP ROM FF3 2369 060 1 0 930 1 New EP ROM FF3 2369 070 0 1 2 Old EP ROM FF3 2370 060 1 0 930 2 New EP ROM FF3 2370 070 0 1 3 Old EP ROM FF3 2371 00G 1 0 930 1 New EP ROM FF3 2371 07G 0 1 4 Old EP ROM FF3 2372 00G 1 0 930 2 New EP ROM FF3 2372 07G 0 1 5 Old EP ROM FF3 2373 00G 1 0 930 1 New EP ROM FF3 2373 07G 0 1 6 Old EP ROM FF3 2...

Page 21: ...CB ASS Y FRE FG5 9313 06G 0 1 13 Old DC CONTROLLER PCB ASS Y GER FG5 9314 05G 1 0 930 New DC CONTROLLER PCB ASS Y GER FG5 9314 06G 0 1 14 Old DC CONTROLLER PCB ASS Y ITA FG5 9315 05G 1 0 930 New DC CONTROLLER PCB ASS Y ITA FG5 9315 06G 0 1 15 Old DC CONTROLLER PCB ASS Y FG5 9317 050 1 0 930 New DC CONTROLLER PCB ASS Y FG5 9317 060 0 1 Affected machines LPS version NP6251 version 7 CJB 01409 and la...

Page 22: ...V 240V machines two heaters have been installed to comply with the flicker and harmonic controls which are part of the radio interference controls The major differences in part numbers between the Parts Catalog and the Canon Giessen made 220 240V machine are listed in the table below Description Parts Catalog GSN 220V 240V Q ty Heater H1 FH7 4441 000 FH7 4551 000 1 Heater H2 FH7 4552 000 1 Fixing ...

Page 23: ...nt of the transfer separation corona assembly and copying is continued leakage can lead to a serious quality problem Cause When making a double sided copy a jam is likely to occur if a sheet stacked on the holding tray assembly curls greatly When the fixing feeding unit is slid out in in this condition the base plate of the unit can hook the curled paper causing the paper to get trapped along the ...

Page 24: ...guide into the hole of the roller mount found at the center of the inlet guide assembly 3 Fit the upper guide retainer to the holding tray upper guide 4 Fit the upper guide lower retainer to the upper guide from under the holding tray upper guide and secure it in place with screws The upper guide lower retainer has its own orientation Be sure to fit it on the upper guide retainer in advance It can...

Page 25: ...4x8 XA9 0628 000 0 1 5 Old HOLDING TRAY ASSEMBLY FG5 4405 210 1 0 335 New HOLDING TRAY ASSEMBLY FG5 4405 300 0 1 6 Old HOLDING TRAY ASSEMBLY FG5 8666 110 1 0 335 New HOLDING TRAY ASSEMBLY FG5 8666 210 0 1 7 Old New UNIT UPPER GUIDE HOLDING TRAY FG6 3412 000 0 1 1 Interchangeable by replacing all 4 parts at the same time Affected Machines LPS version NP6251 CJB 15178 and later DJB 11396 and later A...

Page 26: ... to the organic matters in the toner ingredients The lowered resistance causes the charge on the drum surface to shift sideways with the consequence of smearing and blurring of images Servicing If any of the following symptoms caused by the photosensitive drum occur in the field use the drum cleaning powder CK 0429 and follow the cleaning procedure described below Also when replacing the cleaning ...

Page 27: ...itive drum with new lint free paper If the surface is still uneven go back to step 3 Increase the strokes as necessary 5 Rotate the drum over 5 to 10 cm and repeat steps 2 to 4 Repeat until the entire surface of the drum has been covered Notes for servicing Adhered foreign matters cannot be removed just with solvent alcohol always be sure to use cleaning powder CK 0429 Clean the photosensitive dru...

Page 28: ...an come into contact with the electrode of the scanning lamp Cause A spacer was added under the vertical size plate to accommodate the change of the thickness of the copyboard glass from 3 to 4 mm As a result the gap between the vertical size plate and the control panel has increased to allow intrusion of objects The problem in question is not relevant to machines with a 3 mm glass sheet Factory m...

Page 29: ...rol panel of a machine which was provided with a field use protective sheet make sure that the field use protective sheet is under the control panel Attaching the Field Use Protective Sheet 1 Remove the vertical size plate and the left stay cover 2 Insert the protective sheet between the upper left stay and the control panel and attach it to the upper left stay according to the reference points in...

Page 30: ...escription Part number Q ty Inter change ability P C 1 Old New SHEET PROTECTION FB4 9953 000 0 1 Affected machines NP6251 220V PCV00511 and later 240V RBK00566 and later Giessen factory 220V CJB02926 and later 240V DJB01046 and later ...

Page 31: ...can suffer an open circuit leading to E000 To prevent this problem the sub thermistor will be changed to another type Details Symptom E000 is indicated and in about 5 sec the power switch turns Off Cause The sub thermistor suffers an open circuit Factory Measures The sub thermistor will be changed to a new type See the illustrations below Old type New type COPIER Connector white Connector yellow C...

Page 32: ... Service Parts No Description Part number Q ty Inter change ability P C 1 Old HOLDER THERMISTOR FG5 8812 000 1 0 810 44 New HOLDER THERMISTOR FG5 8812 040 0 1 Affected machines NP6251 220V PCV 00441 and later 240V RBK 00301 and later Affected machines LPS version NP6251 CJB 14081 and later DJB 11396 and later No Yes ...

Page 33: ...onsequence of poor engagement of the cassette rail 16T gear fan type and the pick up assembly lift plate gear the related parts have been changed Details Phenomenon Lifter fails to rise Cause Poor engagement due to warping of the 16T gear and jolting of the lift plate gear Factory measure Addition of a reinforcement rib to the 16T gear Fig 1 Addition of a shim washer to the lift plate Fig 2 Additi...

Page 34: ...arts No Description Part number Q ty Inter change ability P C 1 Old GEAR 16T FB2 7882 030 4 0 104 New GEAR 16T FB2 7882 050 0 4 2 Old PLATE LIFT FF5 3063 000 1 0 310 311 New PLATE LIFT FF5 3063 030 0 1 3 Old 310 311 New SHIM XD1 1106 216 0 1 Affected machines NP6251 220V PCV00515 and later 240V RBK00816 and later Affected machines LPS version NP6251 CJB16301 and later DJB13296 and later No Yes No ...

Page 35: ...ails Symptom E020 indication Cause The hopper toner sensor fails to perform toner level detection correctly due to a deformation of the stirring spring over its use life Factory measure Change the shape of the stirring spring so that this part which has been a one piece unit is now subdivided into three separate parts Old parts New parts Fig 1 Before and after changing to the new parts COPIER Scre...

Page 36: ...r assembly upon replacing the stirring spring since this spring is used inside the hopper Special precautions to take in installing the new parts see Fig 2 1 Insert the protruding point of the stirring spring separator onto the crevice point of the stirring spring holder 2 Push the stirring rod into the hole of the shaft until it stops and fasten with a screw Fig 2 Installing the new parts Screw C...

Page 37: ... 1100 502 3 2 620 New 6 Old HOPPER ASSEMBLY FG5 4387 130 1 0 620 New HOPPER ASSEMBLY FG5 4387 150 0 1 7 Old HOPPER ASSEMBLY FG5 8656 040 1 0 620 New HOPPER ASSEMBLY FG5 8656 090 0 1 8 Old HOPPER ASSEMBLY FG5 8808 000 1 0 620 New HOPPER ASSEMBLY FG5 8808 100 0 1 9 Old HOPPER ASSEMBLY FG5 8868 000 1 0 620 New HOPPER ASSEMBLY FG5 8868 050 0 1 1 Interchangeable by replacing all five parts at the same ...

Page 38: ...am paper detection has been installed near the main unit side contact section main drive assembly of the transfer separation corona assembly This microswitch displays error code E013 upon detecting jammed papers E013 code originally served the purpose of detecting waste toner feedscrew error Now this code is also used to detect paper jams Servicing The position and installation procedure for the p...

Page 39: ...Install the high voltage connector unit at the place where the transfer high voltage connector was installed 5 Remove the connector J780 of the waste toner relay cable FG5 5045 000 connected to the microswitch MSW4 for the waste toner feedscrew locking condition See Fig 3 6 Connect the cable connected to the microswitch of the high voltage connector unit between the two middle connectors of the co...

Page 40: ...E FH2 9230 000 0 1 5 Old 250 New SCREW MACHINE M4 6 XB1 2400 609 0 2 6 Old MAIN DRIVE ASSEMBLY FG5 4457 100 1 0 250 New MAIN DRIVE ASSEMBLY FG5 4457 220 0 1 7 Old MAIN DRIVE ASSEMBLY FG5 8718 000 1 0 250 New MAIN DRIVE ASSEMBLY FG5 8718 090 0 1 1 Interchangeable by replacing all five parts at the same time Affected machines NP6251 220V PCV00676 and later PJY00001 and later 240V RBK00816 and later ...

Page 41: ...e replacing the air filter in the field Details Symptom Light image Cause If the machine is located in a place where there is a lot of dust the dust collects inside the lens unit and a large amount adheres to the lens surface As a result of this the amount of light from the original illumination lamp increases to result in a light image Factory measure To reduce the amount of dust inside the machi...

Page 42: ...at the filter can be attached on the top and the rim of the filter is positioned toward you See Fig 1 2 The farther end of the air filter U and the section provided with the rim is to be inserted to the slot of the inner cover shown shaded in View A Air Filter Air Filter U 2 FF5 7572 Air Filter FB4 6224 Air Filter Electrostatic FB4 6225 Inner Cover Left FF5 7571 New Old Fig 1 Old and New parts Sec...

Page 43: ...change ability P C 1 Old 101 New COVER LEFT FF5 7571 000 0 1 2 Old 101 New FILTER AIR FF5 7572 000 0 1 3 Old 101 New FILTER AIR FB4 6224 000 0 1 4 Old 101 New ELECTROSTATIC FILTER AIR FB4 6225 000 0 1 1 Interchangeable by replacing the two parts at the same time 1 1 ...

Page 44: ... enabling to push the tab on the front side size plate becomes displaced 4 The control panel indicates an Inch size paper when an AB size paper is selected Cause 1 The strength of the handle latch is not adequate 2 The strength of the release arm is not adequate 3 If the locking plate of the front side size plate does not fit into the positioning slot smoothly one may try to forcefully move the la...

Page 45: ...trength Figure 1 2 Use POM instead of ABS as the material for the release arm to increase its strength Figure 1 Handle latch New type modification in shaded area Old type Reinforced Figure 2 Release arm New type POM FB1 8478 T1 FB1 8478 T1 Old type Identified as POM above the part No notation ...

Page 46: ...ith the new type 2 Damage to the release arm Replace the release arm FB1 8478 with the new type 3 Displacement of the torsion spring Replace the latch FB1 8699 with its tab and the front side size plate FF5 1510 with the new type 4 Wrong setting of the paper width If the user is not using Inch papers attach the sheet FB3 8711 for preventing wrong paper width setting on the inside of the cassette F...

Page 47: ...over the slots marked D F H K and L in achieving the affixing requirements Caution 1 Make sure that the protective sheet is affixed in such a way that it is firmly pressed to the paper guide plate of the cassette with no bulges 2 Do not accidentally cover the slot marked A because this slot is to be used for registration of the paper width standard value Affix the protective sheet by using the fro...

Page 48: ...1 0 300 New LATCH FB1 8699 020 0 1 3 Old PLATE SIZE SIDE FRONT FF5 1510 000 1 0 300 New PLATE SIZE SIDE FRONT FF5 1510 030 0 1 4 Old 300 New SHEET FB3 8711 000 0 1 5 Old ARM RELEASE FB1 8478 020 1 0 300 New ARM RELEASE FB1 8478 030 0 1 1 Interchangeable by replacing the two parts at the same time Affected machines LPS version NP6251 CJB00001 and later DJB00001 and later No Yes No Yes 1 1 ...

Page 49: ...osen and detach as the result of vibration or heat If the screw detaches it can in the worst case fall down into the space between the thermoswitch and the reciprocating shaft to permit a short circuit This is to communicate a procedure to follow with machines in the field to prevent this problem Servicing During visits for servicing replace the 6mm screw retaining the bushing plate with the 8mm s...

Page 50: ...web 2 Removing the flywheel mount Remove the 2 screws 1 and remove the flywheel mount 3 Removing the flywheel Remove one E ring 2 and remove the flywheel 4 Removing the heater support plate and the heater cord guide Remove the 2 screws 3 and remove the heater support plate and the heater cord guide 1 Flywheel mount Fixing web front side 2 Flywheel Heater cord guide Heater support plate 3 ...

Page 51: ...inner side of the drive support plate Remove one end of the spring at front which is hooked to the arm guide plate 7 Removing the drive support plate Remove the 2 screws 7 and remove the drive support plate While removing the plate be careful not to deform the leftward section where the screw is used to retain the plate 5 6 4 Unhook this part Drive support plate Spring at front Arm guide plate Do ...

Page 52: ...B7 2100 409 to the screw and tighten it firmly While the nut is being tightened restrain the movement of the screw with the use of the screwdriver to prevent rotation of the screw 9 Assembly Follow the procedure in reverse for assembly Service Parts No Description Part number Q ty Inter change ability P C 1 Old SCREW MACHINE M4x6 XB1 2400 609 1 0 811 or 810 New SCREW M4x8 XB1 2400 807 0 1 2 Old 81...

Page 53: ...will be available in addition to the currently used roller FB2 7200 000 DETAILS The new type roller has a hard layer which prevents both sticking of the OHP to the fixing roller and digging of the separation claws into the surface of the roller It is noted that the image quality in the grey scale may differ with the new type roller the soft roller type has a better grey scale fixing SERVICING If O...

Page 54: ...ry measures A strong polishing pad will be used to improve the cleaning of the corona wire Because of this changes were made to the cleaner cleaning block felt folder and guide pin Servicing When the above problem is noted replace at the same time the corona wire cleaner cleaning block felt holder and guide pin of the primary corona assembly or transfer corona assembly with the new parts Also in o...

Page 55: ...l be used 3 The methods to identify between the old and new corona wire cleaner guide pin and felt holder are as follows See tabulated information and the Figures below Corona wire Background color for the label Blue White Cleaner New Part Old Part Color of the cleaning block Blue Black Color of the felt folder Blue Creamy white Guide pin New Part Old Part Width of pin assembly plate 9mm 6mm Coron...

Page 56: ...84 000 0 3 5 Old WIRE CORONA 0 06MM 100M FY3 0040 000 AR 550 570 580 New WIRE CORONA 0 06MM 20M FB4 3687 000 AR 6 Old HOLDER FB2 7091 000 1 0 580 New HOLDER FELT FB3 8349 000 0 1 7 Old PRIMARY CORONA ASSEMBLY FG5 4378 030 1 0 550 New PRIMARY CORONA ASSEMBLY FG6 3416 000 0 1 8 Old TRANSFER SEPARATE CORONA ASS Y FG5 4550 090 1 0 580 New TRANSFER SEPARATE CORONA ASS Y FG6 3417 000 0 1 9 Old TRANSFER ...

Page 57: ...s change enables attachment of the hinge shaft with one hinge stop plate instead of two Details A brim was added to the new hinge shaft with the consequence that the bottom hinge stop plate of the hinge shaft is no longer needed See Figure below Servicing When replacing the hinge shaft with a new one attach it with the end with the brim at the bottom COPIER New hinge shaft Old hinge shaft Stopper ...

Page 58: ...nge ability P C 1 Old SHAFT HINGE FB2 7867 000 1 0 101 New SHAFT HINGE FB2 7867 020 0 1 2 Old PLATE HINGE STOP FB2 7866 000 2 1 101 New 1 Interchangeable by replacing all two parts at the same time Affected Machines LPS version NP6251 CJB00001 and later DJB00001 and later 1 1 ...

Page 59: ...of the lens mount with your hand do not turn the pulley attached to the motor for movement in Y direction with your hand The edge of the pulley is sharp and the practice of turning the pulley in an attempt to move the mount can lead to injuring your hand Following the instructions given in the service manual first remove the plug for the power supply hold the lens mount near where it engages with ...

Page 60: ...cate items to note so that service personnel will clean the fixing assembly oil pan safely Details When cleaning the fixing assembly oil pan do so while removing it from the main unit as little as possible In cases where the oil pan is removed clean it while taking care not to scratch yourself on its edges especially the inner edge COPIER Fig 1 Fixing Unit Oil pan Important ...

Page 61: ...l come in contact with the plate on the rear side of the main unit If the lead wire coating or the faston s protective tube are damaged there is the chance of a short against the rear plate See Fig 1 COPIER Fig 1 Example of Lead Wire Making Contact This lead wire does not exist in some 200V machines which have only 1 heater If this heater terminal is bent in the direction of the arrow there is the...

Page 62: ...ensions as shown in Fig 2 Measure by placing the scale directly against the heater cover 2 When removing and attaching the faston to and from the heater terminal when replacing the fixing heater do not bend the heater terminal or scratch the faston s protective tube See Fig 3 If the heater terminal is bent replace it 3 After replacing the fixing heater check the dimensions as shown in Fig 2 Scale ...

Page 63: ...rs So as not to damage the protective tube ó Grip the narrow section of the faston with the part of the tips wrapped with paper or cloth ì Gently remove or attach the faston to or from the heater terminal Needlenose pliers Faston Heater terminal Fig 3 How to Remove Attach Faston Section wrapped with paper or cloth ...

Page 64: ... deck paper stock assemblies The factory countermeasure will consist of removing burrs from the edges Servicing When servicing in the field lightly feel the edge of the paper limit plate If there are any sharp burrs follow the steps below to tape them Procedures 1 Pull out the right and left front deck paper stock assemblies 2 Clean the edge of the paper limit plate é Use 5 or 6 sheets of lint fre...

Page 65: ...6251 024 2 2 Cut off Cut off Protective tape Figure 1 Affix the protective tape ...

Page 66: ...ving the fixing assembly from the main unit if the AC line is not shut off there may be an arc discharge between the fixing assembly and the main unit connectors causing the connectors to be burned In order to prevent this the following procedure which is already described in the service manual should be observed carefully COPIER Fig 1 Fixing assembly rear side 1 Before sliding out the fixing asse...

Page 67: ...in unit If there is any faulty connection replace the cable described below which is attached to the AC connector with a new one Location Description Part number Fixing assembly CABLE FIXING 115V 120V FG5 8857 000 ASSEMBLY 220V 240V FG5 8858 000 Rear side plate WIRE AC FG5 9420 000 Use FG5 8857 000 for a machine equipped with two fixing heaters ...

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Summary of Contents for NP6251

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Canon NP6251, Service Bulletin

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Summary of Contents for NP6251

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