Page 1 IMPORTANT SAFETY NOTICES PREVENTION OF PHYSICAL INJURY 1. Before disassembling or assembling parts of the copier and peripherals, make sure that the copier power cord is unplugged. 2. The wall outlet should be near the copier and easily accessible. 3. Note that some components of the copier and the peripherals are supplied with electrical voltage even if the main switch is turned off.
Page 2: Observance Of Electrical Safety Standards
OBSERVANCE OF ELECTRICAL SAFETY STANDARDS 1. The copier and its peripherals must be installed and maintained by a customer service representative who has completed the training course on those models. 2. The RAM board on the main control board has a lithium battery which can explode if replaced incorrectly.
Page 3: Overall Machine Information
SECTION 1 OVERALL MACHINE INFORMATION...
Page 4: Specifications
31 December 1992 SPECIFICATIONS 1. SPECIFICATIONS Configuration: Table top Copy Process: Electrostatic transfer system Original Feed: Sheet feed Original Size: Maximum: 914 x 3,600 mm Minimum: 182 x 257 mm (B5 lengthwise) Copy Size: Same as "Original Size" Copying Speed: Manual feed: 6 cpm (A1/D sideways) Sheet &...
Page 5 SPECIFICATIONS 31 December 1992 Image Transfer: Single wire dc corona (negative charge) with pre-transfer lamp Paper Separation: Dual wire ac corona and pick-off pawls Cleaning: Cleaning blade Quenching: Photo quenching by LEDs Paper Feeding: Manual feed (sheet and roll feeder optional) Image Fusing: Heat and pressure type, teflon (upper) and silicone rubber (lower) rollers...
Page 6: Machine Configuration
31 December 1992 MACHINE CONFIGURATION 2. MACHINE CONFIGURATION This copier can be equipped with optional equipment as show above. 1. Copier (A098) 2. Sheet Feeder (A453) 3. Roll Feeder (A454) and Connector (A384) 4. Roll Feeder (A454) and Sheet Feeder (A453)
Page 7: Drum Processes
DRUM PROCESSES 31 December 1992 3. DRUM PROCESSES 1. Charge In the dark the charge corona unit applies a negative charge to the drum. The grid plate ensures the charge is applied uniformly. The charge remains on the surface of the drum because the photoconductive drum has a high electrical resistance in the dark.
Page 8 31 December 1992 DRUM PROCESSES 3. Development The magnetic developer brush on the development roller comes in contact with the latent image on the drum surface. Toner particles are electrostatically attracted to the negatively charged latent image areas. 4. Pre-Transfer Lamp The pre-transfer lamp illuminates the drum prior to image transfer.
Page 9: Mechanical Component Layout
MECHANICAL COMPONENT LAYOUT 31 December 1992 4. MECHANICAL COMPONENT LAYOUT...
Page 10 31 December 1992 MECHANICAL COMPONENT LAYOUT 1. Front Original Feed Roller 19. Pressure Roller 2. Exposure Lamp 20. Transport Belt 3. 1st Press Rollers 21. Pick-off Pawls 4. Fiber Optic Array 22. T/S Corona Unit 23. Paper Registration Rollers 5. Platen Roller 6.
Page 11: Drive Layout
DRIVE LAYOUT 31 December 1992 5. DRIVE LAYOUT 1. Original Drive Belt 2 11. Toner Supply Clutch 22. Drum Drive Belt 2. Rear Original Feed Rollers 12. Development Motor 23. Feed/Fusing Drive Belt 1 24. Transport Roller Sprocket 3. Original Drive Clutch 13.
Page 12: Electrical Component Descriptions
31 December 1992 ELECTRICAL COMPONENT DESCRIPTIONS 6. ELECTRICAL COMPONENT DESCRIPTIONS Refer to the electrical component layout on the reverse side of the Point to Point (Water proof paper) index numbers. Name Function Index. No. Motors Main Drives all mechanical components except the development unit and the fans.
Page 13 ELECTRICAL COMPONENT DESCRIPTIONS 31 December 1992 Name Function Index. No. Switch Back Lifts the switch back gate to the up position. Gate Original Stopper Moves the original stopper down to prevent an original from being inserted. Switches Main Supplies power to the copier. Upper Safety Cuts ac 100 volt power when the upper unit is opened.
Page 14 31 December 1992 ELECTRICAL COMPONENT DESCRIPTIONS Name Function Index. No. Switch Back Detects if the switch back gate moves to the Gate up position during the original switch back. Original Exit Detects jams in the original exit section. Recycle Gate Detects whether the recycle gate is in the up or down position.
Page 15 ELECTRICAL COMPONENT DESCRIPTIONS 31 December 1992 Name Function Index. No. Fusing Provides heat to the fusing unit. Pre-Transfer Reduces the charge on the drum surface prior (PTL) to image transfer. Power Packs Charge/Bias/Grid Provides high voltage power for the charge Power Pack corona, charge grid, and development bias.
Page 16 31 December 1992 ELECTRICAL COMPONENT DESCRIPTIONS Name Function Index. No. Vacuum Fan Motor start capacitor. Motor Capacitor 1-13...
Page 17 ORIGINAL AND PAPER PATH 31 December 1992 7. ORIGINAL AND PAPER PATH Repeating Copy Except for A0/E, A1/D Lengthwise A: Upper Copy Exit B: Lower Copy Exit 1-14...
Page 18 31 December 1992 ORIGINAL AND PAPER PATH A0/E, A1/D Lengthwise Switching Back : Switching Back 1-15...
Page 19: Detailed Section Descriptions
SECTION 2 DETAILED SECTION DESCRIPTIONS...
Page 20 31 December 1992 DRUM DRUM 1.1 DRUM CHARACTERISTICS The organic photoconductor (OPC) drum has the following characteristics: • It is able to accept a high negative electrical charge in the dark. (The electrical resistance of the OPC drum is high in the absence of light.) •...
Page 21: Drum Drive
DRUM 31 December 1992 1.2 DRUM DRIVE The OPC drum [A] is 80 millimeters in diameter and 970 millimeters long. It turns constantly when the main motor [B] is on. When the main motor turns on, drive is transmitted to the drum as follows: ⇒...
Page 22 31 December 1992 CHARGE CHARGE 2.1 OVERVIEW Charge Grid This model uses a single wire corona unit [A] to charge the OPC (organic photoconductor) drum [B]. The corona wire generates a corona of negative ions when a high negative voltage is applied to it by the charge/grid power pack [P1].
Page 23: Charge Corona Circuit
CHARGE 31 December 1992 2.2 CHARGE CORONA CIRCUIT Charge/Bias/Grid PP DC Power Charge / Bias Grid PP CN1-1 24V Va CN1-2 CN107 Main Board -B14 DC/DC CN1-3 Converter Charge CN110 Grid Drive CN1-6 DC/DC Grid monitor CN1-10 Converter The DC power supply board supplies +24 volts (Va) to the charge/bias/grid power pack as the power supply source.
Page 24 31 December 1992 EXPOSURE EXPOSURE 3.1 OVERVIEW Light from the exposure lamp [A] reflects off the original and through the fiber optics [B] to the OPC drum [C]. The reflector plate [D] aides the exposure lamp intensity for high original moving speed. During exposure, the original moves across the exposure glass at the same speed as the drum’s peripheral velocity.
Page 25: Original Feed
EXPOSURE 31 December 1992 3.2 ORIGINAL FEED 3.2.1 Basic Operation [H] [G] When the original is inserted on the original table [A], it activates the original set sensor [B]. The main motor then turns on. Two seconds later the original feed clutch turns on to start turning the front original feed rollers [C], rear original feed rollers [D], and original registration rollers [E].
Page 26 31 December 1992 EXPOSURE The main CPU determines the original length for synchro cutting by counting the generated pulses after the 1st original transport sensor detects the leading edge of the original until the original set sensor detects the trailing edge of the original.
Page 27 EXPOSURE 31 December 1992 3.2.2 Drive Mechanism Drive power from the main motor is transmitted to the relay pulley [A]. When the original forward feed clutch [B] is energized, the rear original feed roller shaft [C] starts turning the original drive belt 3 [D] forward through the original drive belt 2[E].
Page 28 31 December 1992 EXPOSURE 3.3 ORIGINAL STOPPER MECHANISM Originals should not be inserted during a copy cycle. To prevent originals from being inserted, the machine locks the feeler of the original set detector in the down position while copying. This is accomplished by the original stopper solenoid [A].
Page 29: Exposure Lamp Control
EXPOSURE 31 December 1992 3.4 EXPOSURE LAMP CONTROL [PCB4] CN1-1 [L1] CN3-1 LAMP Exp. Lamp CN3-2 CN1-2 REGULATOR CN2-1 CN3-4 CN3-5 CN2-2 Lamp OFF (+5V) Lamp ON (GND) CN2-2 T = 1.0 ms Duty = 15% to 100% The lamp regulator receives 100 volts ac at CN1-1 and CN1-2. It also receives +5 volts, which is used in the lamp regulator’s control circuit, from the main board at CN2-1.
Page 30 31 December 1992 EXPOSURE 3.5 MANUAL ID CONTROL VS ADS Light Sensor Light Sensor Manual ID Level Manual ID Level Output [V] Output [V] 0.74 1.21 0.80 1.25 0.81 1.29 0.82 1.33 0.84 1.37 0.86 1.41 0.90 1.45 0.94 1.50 0.99 1.54 1.05...
Page 31 EXPOSURE 31 December 1992 3.5.2 ADS Control Vod/Vsd VS [V] Vod/Vsd VS [V] 0 ~ 0.18 1.74 0.66 ~ 0.69 1.21 0.19 ~ 0.46 1.74 0.70 ~ 0.73 1.15 0.47 ~ 0.49 1.64 0.74 ~ 0.75 1.05 0.50 ~ 0.53 1.54 0.76 ~ 0.80 1.05...
Page 32 31 December 1992 EXPOSURE 3.6 AUTO DENSITY SENSOR (ADS) Center Line 10mm 18 mm Sampled Area 33.5 mm 20 mm The ADS [A] measures the reflectivity of the original’s background. Based on the originals background image density, the CPU automatically adjusts the development bias and exposure light intensity to achieve a good copy image.
Page 33 EXPOSURE 31 December 1992 3.6.1 ADS Circuit R404 R401 C404 CN401-1 Vcc(+5V) CN401-3 IC401 ADS:OUT D401 ADS ADJUST IC401 CN401-5 C401 R402 R403 C402 CN401-2 C-GND C403 ADS RESET CN401-4 Vcc(+5V) CN401-6 LAMP401 SENSOR LAMP CN401-7 The ADS circuit is powered by +5 volts, which is provided at CN401-1 for the detection circuit and CN401-6 for the lamp.
Page 34 31 December 1992 EXPOSURE 3.7 LAMP HEATER This copier uses a fluorescent lamp [A] as the exposure light source. The output of the exposure lamp varies depending on the temperature; low temperatures especially degrade the light output. To prevent fluctuations in temperature from affecting the copy image, the lamp heater [B] keeps the lamp’s temperature at 40°C.
Page 35 EXPOSURE 31 December 1992 3.8 LAMP HEATER CONTROL CIRCUIT AC 100 V CN401 PCB5 PCB1 CN107 CN407 CN406-1 L. Heater ON CN406-2 CN408 CN407-4 Short Comparator Circuit CN407-3 Control Open Main PCB AC Controller 2 The lamp thermistor, which is mounted together with the lamp heater, monitors the lamp temperature.
Page 36 31 December 1992 DEVELOPMENT DEVELOPMENT 4.1 OVERVIEW When the development motor turns on, the paddle roller [A] and development roller [B] start turning. The paddle roller picks up developer in its paddles and transports it to the development roller. Internal magnets in the development roller attract the developer to the development roller sleeve.
Page 37: Drive Mechanism
DEVELOPMENT 31 December 1992 4.2 DRIVE MECHANISM To reduce load on the main motor, the development unit uses a separate drive motor [A]. The development drive pulley turns the development drive belt [B] which turns the development drive gear [C]. The development drive gear turns the development roller gear [D] and the paddle roller gear [E].
Page 38: Cross Mixing
31 December 1992 DEVELOPMENT 4.3 CROSS MIXING "Crossmixing" keeps the toner and carrier evenly mixed in the developer and evenly distributes the developer within the development unit. Crossmixing also agitates the developer to generate the necessary triboelectric charge on the toner and carrier particles. The arrows in the above illustration show the developer movement directions within the machine.
Page 39: Toner Density Control
DEVELOPMENT 31 December 1992 4.4 TONER DENSITY CONTROL ID Sensor Check Toner Sensor Check Toner ID sensor density normal? low? Toner density sensor Abnormal, High Low, Normal Toner supply solenoid ON Original longer than 1220 mm? Low, Normal, High Toner Toner density sensor density...
Page 40 31 December 1992 DEVELOPMENT 4.4.1 Image Density Sensor 0.2V Toner is supplied Voltage No toner is supplied. Thres- hold Level Standard Intensity LED Light Intensity Weak Strong Toner density is detected by develop- ing the sensor pattern and by check- ing its reflectivity with the image density sensor (photosensor).
Page 41 DEVELOPMENT 31 December 1992 (If service program mode #21 is set to "1", the toner density will be checked every 610 mm regardless of Vsp/Vsg.) The toner supply amount (%) can be adjusted using service program mode #17. Using service program #34, Vsp, Vsg, and Vsp/Vsg can be displayed in the copy counter.
Page 42 31 December 1992 DEVELOPMENT 4.4.2 Toner Density Sensor Toner Density Sensor (S2) Main Board (PCB1) CN101-1 [24V] Va Control Toner Density Sensor [7.0V] (Control) Circuit Coils The toner density sensor works in conjunction with the ID sensor to control the amount of toner in the developer mixture. It has three basic functions. First, it controls the toner supply in case the toner density is greater than the upper limit and the toner density is less than the lower limit.
Page 43 DEVELOPMENT 31 December 1992 The active sensing element is a very small transformer with three coils. When iron ferrite (carrier) is near the sensing element, the inductance of the coils changes, causing the current through the transformer to change. As the amount of toner in the developer increases, the effect of the carrier particles decreases and the voltage applied to CN101-2 decreases.
Page 44: Development Bias
31 December 1992 DEVELOPMENT 4.5 DEVELOPMENT BIAS 4.5.1 Basic Concept When the drum is exposed, most of the negative charge is eliminated from the areas where light strikes the drum. This leaves a negative charge pattern corresponding to the dark areas of the original. After exposure however, a small residual charge of about –100 volts (for white paper) remains in the exposed areas.
Page 45 DEVELOPMENT 31 December 1992 Lighter Normal Darker -300 -280 -260 -220 -260 -240 -180 -220 -200 -160 -200 -180 0.88 0.80 0.75 ADS Vod/Vsd Vod: Original Density Detecting Voltage (ADS out put voltage) Vsd: Standard Pattern (White Plate) Density Detecting Voltage 4.5.3 Auto Image Density Bias The above chart shows the development bias when in ADS mode.
Page 46 31 December 1992 DEVELOPMENT 4.6 IMAGE DENSITY SENSOR BIAS The ID sensor bias is similar to the development bias; however, it is applied only when developing the ID sensor pattern. Basically, the ID sensor bias is fixed. The normal ID bias level is –200 volts, but it can be changed using service program #18.
Page 47: Toner Supply
DEVELOPMENT 31 December 1992 4.7 TONER SUPPLY To allow a compact design, the toner supply mechanism is built into the toner cartridge. An agitator [A] in the toner cartridge turns when the toner supply solenoid is on (toner supply spring clutch engaged). As the agitator rotates, mylar strips [B] on the ends of the agitator force toner through small holes (0.5 mm) in a plastic strip [C] along one side of the toner cartridge.
Page 48: Image Transfer And Paper Separation
31 December 1992 IMAGE TRANSFER AND PAPER SEPARATION IMAGE TRANSFER AND PAPER SEPARATION 5.1 PRE-TRANSFER LAMP (PTL) After the latent image is developed but before the image is transferred to the copy paper, the drum surface is illuminated by the pre-transfer lamp [A]. This illumination reduces the negative potential on the drum surface.
Page 49: Pick-Off Mechanism
IMAGE TRANSFER AND PAPER SEPARATION 31 December 1992 5.4 PICK-OFF MECHANISM The pick-off pawl solenoid [A] is energized 12 pulses after the registration clutch turns on to feed the copy paper to the drum. The pick-off lever [B] then rotates clockwise and pushes up the pawl holder [C]. This releases the two pick-off pawls [D], allowing them to rotate against the drum.
Page 50 31 December 1992 IMAGE TRANSFER AND PAPER SEPARATION 5.5 T/S CORONA CIRCUIT +24 (Va) Transfer/Separation Power pack CN1-1 Main Board CN107 -B12 T. Trig DC/DC -A13 Converter T. Sel -B13 -5.0 kV S. Trig DC/DC Converter -B11 DC/AC S. Sel Inverter (Not Used) AC 4.0 kV...
Page 51 CLEANING 31 December 1992 CLEANING 6.1 OVERVIEW The cleaning blade [A] removes any toner remaining on the drum after the image is transferred to the copy paper. The toner that is wiped off by the cleaning blade drops onto the toner collection coil [B], which then moves it to the used toner tank.
Page 52 31 December 1992 CLEANING 6.2 COLLECTION OF USED TONER The toner collection coil moves used toner from the cleaning unit through the used toner pipe [A] to the used toner tank [B]. The used toner tank can hold about 800 grams of toner. On average, about 10,000 A2 sized copies can be made before the used toner tank needs to be emptied.
Page 53: Toner Overflow Sensor
CLEANING 31 December 1992 6.3 TONER OVERFLOW SENSOR +5 (Vc) Toner Overflow Sensor Main Board CN107 Freq. -B22 Detec- Rectifier tion The toner overflow sensor [A] signals the CPU when the toner collection bottle is full. A small tuning fork [B] is used as the sensing element of the toner overflow sensor.
Page 54 31 December 1992 QUENCHING QUENCHING +24 V Quenching Lamp Main Board CN104 (-B9) After the drum is cleaned by the cleaning blade, light from the quenching lamp neutralizes any charge remaining on the drum. The quenching lamp turns on and off at the same time as the main motor. The quenching lamp consists of two PCBs containing 49 LEDs (light emitting diodes) each.
Page 55: Paper Feed And Registration
PAPER FEED AND REGISTRATION 31 December 1992 PAPER FEED AND REGISTRATION 8.1 OVERVIEW In this copier, paper is fed either manually [A], or by the sheet feeder [B] (option), or roll feeder [C] (option). For manual feed, the copy paper is inserted until it contacts the manual feed rollers [D].
Page 56: Drive Mechanism
31 December 1992 PAPER FEED AND REGISTRATION 8.2 DRIVE MECHANISM Drive power from the main motor is provided to the paper feed and registration drive mechanism from feed/fusing drive belt 2 [A] through the manual feed/registration sprocket [B]. When the manual feed solenoid [C] is energized, the paper feed drive chain [D] drives the manual feed roller [E].
Page 57: Paper Transport
PAPER TRANSPORT 31 December 1992 PAPER TRANSPORT After separation from the drum, the copy paper rides on the transport belts [A] and transport rollers [B] to the fusing unit. Airflow directly from the vacuum fan [C] holds the paper firmly against the belts so that there is enough friction between the paper and the belts for smooth transportation of the paper.
Page 58: Fusing And Paper Exit
31 December 1992 FUSING AND PAPER EXIT 10. FUSING AND PAPER EXIT 10.1 OVERVIEW Two rollers fuse the image to the copy paper by applying heat and pressure. The hot roller [A] is made of carbon-teflon and the pressure roller [B] is made of silicone rubber.
Page 59 FUSING AND PAPER EXIT 31 December 1992 The hot roller strippers [F] separate the copy from the hot roller and direct it to the fusing exit rollers [G]. After the fusing exit rollers, the exit gate [H] directs the copy to either the upper rollers [I] or lower exit [J]. When the exit gate solenoid is on, the exit gate directs the copy paper down through the lower copy exit path.
Page 60 31 December 1992 FUSING AND PAPER EXIT 10.2 DRIVE MECHANISM 10.2.1 Fusing Drive The hot roller is turned by the fusing drive chain as shown. The pressure roller is friction driven by the hot roller. The fusing rollers turn constantly when the main motor [A] is on, driven via the gears [B], through feed/fusing drive belts 1 [C] and 2 [D], the sprockets [E] and the fusing drive chain [F], to the hot roller sprocket [G].
Page 61 FUSING AND PAPER EXIT 31 December 1992 10.2.2 Exit Roller Drive The upper [A] and lower [B] exit rollers are driven by the main motor [C] via a set of gears [D]. Finally, the exit roller drive chain [E] drives the exit rollers through a sprocket as shown above.
Page 62: Fusing Temperature Control
31 December 1992 FUSING AND PAPER EXIT 10.3 FUSING TEMPERATURE CONTROL Overheat Protection AC115,220,240 AC Controller 1 T304 T306 IC107 1.3K CN301 Q101 PC301 CN107-A25 Drive Circuit RA301 CN107-A15 A.GND CN107-B25 T309 T310 T308 T307 T305 CN110-12 CN110-11 CN110-9 CN110-10 RA301: U.S.A.
Page 63 FUSING AND PAPER EXIT 31 December 1992 10.3.2 Overheat Protection The overheat protection circuit on the main board turns off the fusing lamp if the temperature goes too high. The input from TH1 goes to pin 5 of IC107 as well as to the CPU. As the temperature of TH1 increases, its resistance decreases and therefore the voltage at pin 5 of IC107 increases.
Page 64: Temperature Control
31 December 1992 FUSING AND PAPER EXIT 10.4 TEMPERATURE CONTROL Hot Roller Temp. (°C) HIGH NORMAL Operating temp. (Low) Lower Limit (Low) 75 80 Pressure Roller Temp. (°C) The main board monitors the temperature of the hot roller through TH1 and the temperature of the pressure roller through TH2.
Page 65 FUSING AND PAPER EXIT 31 December 1992 The ready condition When the hot roller temperature reaches the ready temperature, the copier goes in to ready condition. Copying is possible. The ready temperature is any where between 3° lower than the hot roller operating temperature. When the mode of the fusing temperature is changed using the Fusing Temperature key on the copier operation panel, the hot roller and pressure roller start to rotate to change to the appropriate operating temperature.
Page 66: Pulse Generator
31 December 1992 OTHERS 11. OTHERS 11.1 PULSE GENERATOR Main Board [PCB1] [S4] CN112-1 CN112-3 CN112-2 The CPU controls the timing of all machine operations based on the number of pulses it receives from the pulse generator. Pulses are generated by rotating a disk with slots in it within a photointerruptor.
Page 67: Operation Panel
OTHERS 31 December 1992 11.2 OPERATION PANEL MAIN BOARD OPERATION PANEL CN106 CN201 -A11 Scan1 -A13 Scan2 -B11 LED Matrix Scan3 Matrix -B13 Scan4 -A12 Scan5 Scan6 CN106 -B15 CN202 -1 Key 1 -B16 Key 2 -A16 Key 3 Seg a Seg b Seg c Seg d...
Page 68: Installation
SECTION 3 INSTALLATION...
Page 69 31 December 1992 ENVIRONMENT 1. ENVIRONMENT 1. Temperature Range: C to 30 C (50 F to 86 2. Humidity Range: 15% to 90% RH 3. Ambient Illumination: Less than 1,500 Lux (do not expose to direct sunlight). 4. Ventilation: Minimum space 20 m Room air should turn over at least 30 m /hr/person.
Page 70: Minimum Space Requirements
ENVIRONMENT 31 December 1992 1.1 MINIMUM SPACE REQUIREMENTS 600 mm 600 mm 600 mm 1000 mm 1. Front: 1,000 mm (39.5 in) 2. Back: 600 mm (24 in) 3. Right: 600 mm (24 in) 4. Left: 600 mm (24 in)
Page 71: Power Source
31 December 1992 ENVIRONMENT 1.2 POWER SOURCE 1. Input Voltage Level: 115 V/60 Hz More than 15 A (for U.S.A. version) 220 V/230 V/240 V/50 Hz More than 7 A (for European version) ± 2. Permissible Voltage Fluctuation: 3. Do not set anything on the power cord. NOTE: a) Make sure the plug is firmly inserted in the outlet.
Page 72: Accessory Check
ACCESSORY CHECK 31 December 1992 2. ACCESSORY CHECK 8, 9 Check the accessories and their quantities according to the following list: 1. Copy Guide ................1 pc 2. Original Guide ................. 2 pcs 3. Left Inner Cover Bracket............1 pc 4.
Page 73: Installation Procedure
31 December 1992 INSTALLATION PROCEDURE 3. INSTALLATION PROCEDURE 1. Stick mylar sheets (large [A] and small [B]). 0 ± 3 0 ~ 3 0 ± 3 0 ~ 3 2. Install the copier on the table. Align the 2 pins [C] and 2 holes [D]. Fix the rear side (1 screw and spacer each) and the front right side (2 bolts).
Page 74 INSTALLATION PROCEDURE 31 December 1992 3. Remove all strips of shipping tape and accessories. 4. Open the original feed unit [A] and remove the two spacers [B]. Remove the protective sheet from the exposure glass. 5. Remove the right middle cover [C] (4 screws).
Page 75 31 December 1992 INSTALLATION PROCEDURE 6. Open the main board [A] (1 screw). 7. Remove the plate [B] (4 screws), fixing the right portion of the upper unit to the lower unit. (Keep two screws for mounting the fixing plate later.) 8.
Page 76 INSTALLATION PROCEDURE 31 December 1992 CAUTION: Make sure that the middle unit is closed completely before carrying out step 9. Otherwise, the middle unit could open suddenly. 9. Remove the screw [A] fixing the left portion of the upper unit to the lower unit. 10.
Page 77 31 December 1992 INSTALLATION PROCEDURE 12. Install the left inner cover bracket [A] (2 screws). 13. Install the pick-off pawl unit [B] (2 connectors [C], 2 knob screws [D], and 2 positioning pins). [B] [C] 14. Remove the drum protection sheet [E] by turning the main motor [F] counterclockwise.
Page 78 INSTALLATION PROCEDURE 31 December 1992 15. Reset the cleaning blade by pulling the release lever [A] towards the front side. Then close the middle unit and open the original feed unit. 16. Open the toner cartridge cover [B], and place a level [C] in the space between the cartridge cover and the developer entrance.
Page 79 31 December 1992 INSTALLATION PROCEDURE 18. 220/230/240 V version machines only. If the voltage of electrical power supply from the wall outlets is 230 V or 240 V, change the voltage as follows: a) Open the lower registration guide plate [A] (4 screws [B]) as shown.
Page 80 INSTALLATION PROCEDURE 31 December 1992 21. Set the leading margin indicator [A] to 00 and the trailing margin indicator [B] to 01 as follows: a) Press the margin key [C]. The leading margin indicator will blink. b) Press the margin set key [D] to set the leading margin indicator to 00. The trailing margin indicator will blink.
Page 81 31 December 1992 INSTALLATION PROCEDURE 26. Remove the sealing tape [A] on the cartridge and turn the knob [B] clockwise until it stops. 27. Lift up the release handle [C] and open the middle unit. 3-13...
Page 82 INSTALLATION PROCEDURE 31 December 1992 28. Install the right inner cover [A] and the bracket [B] on the lower unit. (Use 2 pan-head screws for the bracket. Use 1 flat-head screw and 3 pan-head screws for the right inner cover.) 29.
Page 83 31 December 1992 INSTALLATION PROCEDURE 32. Set the two original guides [A]. 33. Lower the lever [B] of the rear table. 34. Install the copy exit support [C], gear [D], and spring [E] as shown (4 bushings, 1 Allen screw [F]).
Page 84 INSTALLATION PROCEDURE 31 December 1992 37. Stick 4 Velcro seals [A] to the copier and table as shown. Set the 2 copy guide mylar strips [B] as shown. 0 ~ 3 0 ± 3 0 ~ 3 0 ± 3 3-16...
Page 85 31 December 1992 INSTALLATION PROCEDURE 38. Plug in the power supply cord. Turn on DIP SW101-8 on the main board and turn on the main switch. 39. Set the leading margin indicator [A] to 00 and the trailing margin indicator [B] to 40.
Page 86: Service Tables
SECTION 4 SERVICE TABLES...
Page 87: Preventive Maintenance Schedule
31 December 1992 PREVENTIVE MAINTENANCE SCHEDULE 1. PREVENTIVE MAINTENANCE SCHEDULE 1.1 PM TABLE Symbol key: I = Inspect L = Lubricate R = Replace A = Adjust C = Clean A. Original Feed_________________________________________________ 3.6km 7.2km 10.8km 14.4km 18km Notes (6k) (12k) (18k) (24k)
Page 88 PREVENTIVE MAINTENANCE SCHEDULE 31 December 1992 C. Development_________________________________________________ 3.6km 7.2km 10.8km 14.4km 18km Notes (6k) (12k) (18k) (24k) (30k) ( ) A1 sideways/ D size 1. Developer 2. Side seals Replace if damaged 3. Development filter 4. Toner supply Mobil Temp. 78 clutch D.
Page 89 31 December 1992 PREVENTIVE MAINTENANCE SCHEDULE E. Cleaning ____________________________________________________ 3.6km 7.2km 10.8km 14.4km 18km Notes (6k) (12k) (18k) (24k) (30k) ( ) A1 sideways/ D size 1. Cleaning blade To prevent the cleaning blade edge from being damaged, clean it with your finger. Replace at 40 K (A1 sideways/ D size)
Page 90 PREVENTIVE MAINTENANCE SCHEDULE 31 December 1992 H. Fusing ______________________________________________________ 3.6km 7.2km 10.8km 14.4km 18km Notes (6k) (12k) (18k) (24k) (30k) ( ) A1 sideways/ D size 1. Hot roller Replace at 48K (A1 sideways/ D size). 2. Pressure roller Replace at 120K (A1 sideways/ D size).
Page 91 31 December 1992 PREVENTIVE MAINTENANCE SCHEDULE J. Sheet Feeder _________________________________________________ 3.6km 7.2km 10.8km 14.4km 18km Notes (6k) (12k) (18k) (24k) (30k) ( ) A1 sideways/ D size 1. Feed roller Water Replace at 40 K (A1 sideways/ D size). 2. Friction pad Water 3.
Page 92: Regular Pm Procedure
PREVENTIVE MAINTENANCE SCHEDULE 31 December 1992 Every 6 K ( A1 sideways/D size) 1.2 REGULAR PM PROCEDURE Every 12 K (A1 sideways/D size) Make a copy of OS-A1 chart at manual image 1. Make a Copy density level 7. Clean the platen roller, white plate, auto image 2.
Page 93 31 December 1992 PREVENTIVE MAINTENANCE SCHEDULE Clean the charge corona endblocks and casing Around Drum with dry cloth. (every 12 K) 20 K Replace the charge corona wires and wire Around Drum cleaner pads. (every 20 K) 1. Empty used toner tank. 5.
Page 94 PREVENTIVE MAINTENANCE SCHEDULE 31 December 1992 30 K Replace the developer (every 30 K) 1. Clean the manual feed rollers and 7. Paper feed registration rollers with water. (every 6 K) 2. Clean the manual feed table and manual feed guide with water. 18 K 3.
Page 95 31 December 1992 PREVENTIVE MAINTENANCE SCHEDULE 1. Replace the ozone filter. 10. Others (every 6 K) 2. Inspect the timing belts, chains and gears. Lubricate the chains and gears. Others (every 12 K) Clean the feed roller, friction pad and relay 11.
Page 96 PREVENTIVE MAINTENANCE SCHEDULE 31 December 1992 Clean the relay rollers. 13. Roll Feeder Connector (every 6 K) 18 K Lubricate the spring clutch. Roll Feeder Connector (every 18 K) 14. Copy Quality 1. Check the copy quality. 2. Adjust the light sensor voltage by turning VR102 on the main board.
Page 97: Test Points
31 December 1992 SERVICE TABLES 2. SERVICE TABLES 2.1 TEST POINTS Main Board NUMBER FUNCTION TP101 Original registration sensor Adjusts the voltage to +2.6 ± 0.1 volts by VR101 TP102 ID sensor (Vsg) Adjusts the voltage to +4.0 ± 0.1 volts by VR104 TP103 Toner density sensor Adjusts the voltage to +4.0 ±...
Page 98 SERVICE TABLES 31 December 1992 Charge/Grid/Bias Power Pack NUMBER FUNCTION VR101 Adjusts charge corona current VR102 Factory use VR201 Adjusts grid voltage VR301 Adjusts development bias voltage Transfer/Separation Power Pack NUMBER FUNCTION Adjusts low (normal) transfer corona current (T.Trig) Adjusts high transfer corona current (T.Sel) Adjusts ac current of separation corona Adjusts dc current of separation corona Not used...
Page 99: Dip Switches
31 December 1992 SERVICE TABLES 2.3 DIP SWITCHES Main Board NUMBER DPS101-1 Normal Free run (A1 sideways/D size feed cycle) DPS101-2 Normal Forced ready condition (no warm-up) DPS101-3 Length counter Copy counter (for total counter) (for total counter) DPS101-4 *Millimeters **Inches DPS101-5 Normal...
Page 100: Service Tools
SERVICE TOOLS 31 December 1992 3. SERVICE TOOLS 3.1 SERVICE PROGRAM MODE The service program (SP) mode is used to check electrical data and change modes or adjustment values. 3.1.1 Access Procedure 1. Turn on the main switch. 2. Turn on DPS101-8 on the main board. NOTE: The Call Service [A] and Add Toner [B] indicators will blink.
Page 101 31 December 1992 SERVICE TOOLS 3. Enter the desired SP mode number as follows: a) Press the Margin key [C]. "00" will blink in the Leading Margin indicator [D]. Enter the desired SP mode number using the Plus [E] or Minus [F] key (The SP mode numbers are given in the Service Program Mode Table).
Page 102 SERVICE TOOLS 31 December 1992 3.1.2 Service Program Mode Table 1. In the Function column, comments are in italics. 2. In the data column, the default value is printed in bold letters. 3. A "#" after the mode number means that you only need to press the Copy Exit Way key directly without pressing the Plus or Minus key to enter the desired value or mode.
Page 103 31 December 1992 SERVICE TOOLS Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Toner Density Sensor Control Cancel 0: Normal 1: Toner density Cancel the toner density sensor function. sensor When the toner density sensor function is control canceled, ID sensor is only used to control canceled.
Page 104 SERVICE TOOLS 31 December 1992 Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Key Tone ON/OFF 0: ON ° 1: OFF Selects key tone on or off. Default ID Setting 0: ADS ° 1: Manual ID level 7 Specifies whether the copier defaults to ADS or manual ID level 7 when the main switch is turned on.
Page 105 31 December 1992 SERVICE TOOLS Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Image Bias Adjustment 0: Normal (V 1: Darkest Adjust image bias output if the image + 40V) density at ID level 7 cannot be adjusted by 2: Darker the light sensor adjustment.
Page 106 SERVICE TOOLS 31 December 1992 Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator 0: ± 0 mm Leading Edge Blank Margin Adjustment 1: –5 mm Adjusts the leading edge blank margin 2: –4 mm (1 mm/step). 3: –3 mm 4: –2 mm 5: –1 mm 6: +1 mm...
Page 107 31 December 1992 SERVICE TOOLS Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Fusing Temperature Display "F"= Hot roller Temperature Displays the hot roller and pressure roller "P"= Pressure temperature. roller temperature Displays the hot roller and pressure roller temperature in the following order.
Page 108 SERVICE TOOLS 31 December 1992 Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Toner Density Sensor Adjustment "A"= Toner density sensor Adjusts toner density sensor voltage. voltage. Adjusts toner density sensor voltage to +4.0 ± 0.1 volts using VR105 on the main board.
Page 109 31 December 1992 SERVICE TOOLS Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Total Original Misfeeds "J" = Total number of original Displays the total number of original misfeeds. misfeeds (4 digits). To stop the display, press the Copy Exit Way key.
Page 110 SERVICE TOOLS 31 December 1992 Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Total Paper Misfeeds "J" = Total number of paper Displays the total number of paper misfeeds. misfeeds (4 digits). To stop the display, press the Copy Exit Way key.
Page 111 31 December 1992 SERVICE TOOLS Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Exposure Lamp Abnormal Display "–" = Normal "E" = Abnormal Displays when the voltage from the light sensor is less than 0.45 volts for 20 seconds.
Page 112 SERVICE TOOLS 31 December 1992 Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Density Level Display "dL" = Density level (0 ~4) Shows the density level (0 ~ 4) after the initial conditioning (SP#5) is performed. Density Level Vsp/Vsg x 100 0 –10 10 –...
Page 113 31 December 1992 SERVICE TOOLS Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator 0: ± 0 mm Rough Cut Length Adjustment –Synchro Cut Mode 1: –5 mm 2: –4 mm Adjusts the cut length of the synchro cut 3: –3 mm mode to match the original length 4: –2 mm...
Page 114 SERVICE TOOLS 31 December 1992 Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Cut Error Correction 3 –Preset Cut 0 ~ 9 297 mm Correct cut error for preset cut 297 mm. Input the number according to the decal on the roll feeder right cover (0.1 mm/step).
Page 115 31 December 1992 SERVICE TOOLS Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Maximum Copy Paper Length 0: 1 to 1copy–3.6 m Multi copy–1.2 m Limits the maximum copy paper length for 1: 1 to 1 copy–3.6 m the one-to-one copy mode and multi copy Multi copy mode...
Page 116 SERVICE TOOLS 31 December 1992 Mode No. Leading Trailing Function Data Margin Margin Indicator Indicator Cut Error Correction 3 – Synchro Cut 0 ~ 9 297 mm Correct cut error for synchro cut 297 mm. Input the number according to the decal on the roll feeder right cover (0.1 mm/step).
Page 117: Input Check Mode
SERVICE TOOLS 31 December 1992 3.2 INPUT CHECK MODE The input check mode allows you to check the current status electrical components (such as sensors, switches, etc.) from the operation panel. 3.2.1 Access Procedure 1. Turn on the main switch. 2.
Page 118 31 December 1992 SERVICE TOOLS 3. Enter the desired input check number as follows: a) Press the Margin key [C]. "00" will blink in the Leading Margin indicator [D]. Enter the desired input check number using the Plus [E] or Minus [F] key.
Page 119 SERVICE TOOLS 31 December 1992 3.2.2 Input Check Mode Table Input check No Status Upper Exit Lower Exit Leading Trailing Sensor/Switch/Signal Indicator Indicator Margin Margin Indicator Indicator Original Set Sensor Original detected Original not detected 1st Original Transport Sensor 2nd Original Transport Sensor Original Registration Sensor...
Page 120 31 December 1992 SERVICE TOOLS Input check No Status Upper Exit Lower Exit Leading Trailing Sensor/Switch/Signal Indicator Indicator Margin Margin Indicator Indicator Toner Overflow Sensor Used toner Used toner not overflow overflowed Exposure Lamp Heater ON Exposure Lamp Open Not open Thermistor Open (Normal) Exposure Lamp...
Page 121: Output Check Mode
SERVICE TOOLS 31 December 1992 3.3 OUTPUT CHECK MODE The output check mode allows you to turn the current individual electrical components ON/OFF from the operation panel. 3.3.1 Access Procedure 1. Turn on the main switch. 2. Turn on DPS101-7 and 101-8 on the main board. NOTE: The Call Service [A] and Used Toner Tank [B] indicators will blink.
Page 122 31 December 1992 SERVICE TOOLS 3. Enter the desired output check number as follows: a) Press the Margin key [C]. "00" will blink in the Leading Margin indicator [D]. Enter the desired output check number using the Plus [E] or Minus [F] key.
Page 123 SERVICE TOOLS 31 December 1992 3.3.2 Output Check Output Check No Leading Trailing Electrical Component Margin Margin Indicator indicator Main Motor Development Motor Original Stopper Solenoid Recycle Gate Solenoid Original Forward Feed Clutch Manual Feed Solenoid Paper Stopper Solenoid Registration Clutch Pick-off Solenoid Exit Gate Solenoid Pattern Shutter Solenoid...
Page 124 31 December 1992 SERVICE TOOLS Output Check No Leading Trailing Electrical Component Margin Margin Indicator indicator Development Bias (Levels 0 to 9) Copy Counter Indicator Dev. Bias Voltage 0 volt – 60 volts – 60 volts – 80 volts –100 volts –120 volts –140 volts –160 volts...
Page 125 SERVICE TOOLS 31 December 1992 Output Check No Leading Trailing Electrical Component Margin Margin Indicator indicator Grid Voltage (Levels 0 to 9) Copy Counter Indicator Grid Voltage – 0 volts –380 volts –400 volts –420 volts –440 volts –460 volts –480 volts –500 volts –520 volts...
Page 126 31 December 1992 SERVICE TOOLS Output Check No Leading Trailing Electrical Component Margin Margin Indicator indicator Paper Feed Motor (Roll Feeder) Cutter Motor (Roll Feeder) Original Reverse Feed Clutch Switch Back Gate Solenoid 4-41...
Page 127 SERVICE TOOLS 31 December 1992 3.4 MEMORY CLEAR MODE 3.4.1 Misfeed Counter Clear Procedure NOTE: This procedure clears the following counters: SP42 ~ SP48 (Original Misfeed Counters) SP50 ~ SP56 (Paper Misfeed Counters) 1. Turn on the main switch. 2. Turn on DPS101-5 and 101-8 on the main board. NOTE: The Call Service ( ), Misfeed ( ), Used Toner Tank (...
Page 128 31 December 1992 SERVICE TOOLS 3. Press the Plus or Minus key to display "9" on the Copy Counter indicator. 4. Press the Copy Exit Way key to clear memory. 5. Turn off DPS101-5 and 101-8. 6. Clean the optics, sensors, and inside of the copier if necessary. 7.
Page 129: Jam Code List
JAM CODE LIST 31 December 1992 4. JAM CODE LIST When a document (original) jam or paper jam occurs, the cause of the jam is displayed by using the following jam code. 4.1 ACCESS PROCEDURE 1. When a document jam or paper jam occurs, press and hold down the Clear/Stop key.
Page 130 31 December 1992 JAM CODE LIST Code SP Mode No Cause of Jam (DJ =) (Original Misfeed Counter) Original is too small. (Minimum: B5 lengthwise) SP43 (Upper transport section) Original is pulled out from the rear original table after the original registration sensor turns on but before the original registration rollers start turning.
Page 131: Paper Jam Code
JAM CODE LIST 31 December 1992 Code SP Mode No Cause of Jam (DJ =) (Original Misfeed Counter) Recycle gate does not move to down position SP47 when the recycle gate solenoid turns on. (Recycle gate/switch back gate) Switch back gate does not return to the original position (down position) when the switch back gate solenoid turns off.
Page 132 31 December 1992 JAM CODE LIST Code SP Mode No Cause of Jam (PJ =) (Paper Misfeed Counter) Pulse generator (roll feeder) abnormal. SP56 (Roll feeder) Upper exit sensor ON check. SP54 (Exit) Upper exit sensor leading edge OFF check. Lower exit sensor ON check.
Page 133: Special Tools And Lubricants
SPECIAL TOOLS AND LUBRICANTS 31 December 1992 5. SPECIAL TOOLS AND LUBRICANTS DESCRIPTION PART NO. REMARKS Digital Multimeter 54209507 BECKMAN RMS3030 Deluxe Test Lead 54209508 BECKMAN DL241 Accessory Kit Grease – Mobil Temp.78 54479078 400 g/can Current Measuring Drum A0239520 0.35 mm DG Gauge A0989105 0.5 mm DG Gauge...
Page 134: Service Remarks
31 December 1992 SERVICE REMARKS 6. SERVICE REMARKS 6.1 DRUM The organic photoconductor drum is comparatively more sensitive to light and ammonia gas than a selenium drum. 1. Never expose the drum to direct sunlight. 2. Never expose the drum to direct light of more than 1,000 Lux for more than a minute.
Page 135: Charge Corona
SERVICE REMARKS 31 December 1992 6.2 CHARGE CORONA 1. Clean the charge corona wire by turning the gear of the wire cleaner pads clockwise until it stops, then turn the gear counterclockwise and the wire cleaner pads move to the original position. The wire can also be cleaned with a blower brush.
Page 136: Transfer And Separation
31 December 1992 SERVICE REMARKS 6.4 DEVELOPMENT 1. Be careful not to nick or scratch the development roller. 2. Clean the drive gears after removing used developer. 3. Initial conditioning (SP#5) and toner density sensor voltage adjustment (SP#35) are necessary when the developer is replaced. 4.
Page 137: Cleaning Unit
SERVICE REMARKS 31 December 1992 6.7 CLEANING UNIT 1. Be careful not to damage the edge of the cleaning blade. 2. Dispose of used toner according to local regulations. 6.8 FUSING UNIT 1. Be careful not to damage the edges of the hot roller strippers and tension springs.
Page 138 31 December 1992 SERVICE REMARKS 6.12 OTHERS 1. When replacing the main board, if the RAM on the old main board is still usable, remove and place it on the new main board. Then, install the new main board in the copier. 2.
Page 139 SERVICE REMARKS 31 December 1992 8) Perform the following SP modes in sequence. (1) SP#13: Pheripherals Installation (If pheripherals are installed) (2) SP#80 ~ SP#85, SP#90 ~ SP#95: Cut Error Corrections (If the roll feeder is installed) (3) SP#5: Initial Conditioning (4) SP#35: Toner Density Sensor Adjustment (5) SP#33: Vsg Adjustment (6) SP#37: ADS Reference Voltage Adjustment...
Page 140: Replacement And Adjustment
SECTION 5 REPLACEMENT AND ADJUSTMENT...
Page 141: Exterior Covers
31 December 1992 EXTERIOR COVERS 1. EXTERIOR COVERS 1.1 LEFT SIDE COVER REMOVAL 1.1.1 Middle Left Cover 1. Open the original feed unit [A]. 2. Remove the middle left cover [B] (2 screws, loosen 2 screws [C]). 1.1.2 Top Left Cover 1.
Page 142: Right Side Cover Removal
EXTERIOR COVERS 31 December 1992 1.2 RIGHT SIDE COVER REMOVAL 1.2.1 Middle Right Cover 1. Open the original feed unit [A]. 2. Remove the middle right cover [B] (2 screws, loosen 2 screws [C]). 1.2.2 Top Right Cover 1. Open the original feed unit. 2.
Page 143: Exposure Glass Removal
31 December 1992 OPTICS 2. OPTICS 2.1 EXPOSURE GLASS REMOVAL 1. Open the original feed unit. 2. Remove the two exposure glass holders [A]. (2 hexagon head screws each.) 3. Remove the exposure glass [B]. NOTE: When reinstalling the exposure glass, make sure that the beveled edge [C] of the exposure glass must be positioned upward as shown.
Page 144 OPTICS 31 December 1992 2.2 FIBER OPTICS ARRAY REMOVAL/CLEANING 1. Remove the exposure glass. (See Exposure Glass Removal.) 2. Remove the light sensor board [A] (1screw and 1 connector). 3. Remove the two shoulder screws [B] and washers [C] securing the fiber optics unit [D].
Page 145 31 December 1992 OPTICS 2.3 EXPOSURE LAMP/EXPOSURE LAMP HEATER REPLACEMENT –To Remove– 1. Remove the middle left cover, front left cover and left horizontal cover. (See Left Horizontal Cover Removal.) 2. Remove the middle right cover. (See Middle Right Cover Removal.) 3.
Page 146 OPTICS 31 December 1992 –To Install– 10. Place the exposure lamp heater [A] on the exposure lamp [B] as shown. NOTE: The heater fits over the white part [C] of the lamp. Make sure that the heater does not cover the lamp aperture [D]. 11.
Page 147: Drum Replacement
31 December 1992 DRUM 3. DRUM 3.1 DRUM REPLACEMENT –To Remove– 1. Open the middle unit and press the cleaning unit release lever [A] to the rear. 2. Remove the pick-off pawl unit [B] with ID sensor [C] (2 knob screws and 2 connectors).
Page 148 DRUM 31 December 1992 7. Support the drum [A] with your left hand and turn the drum lock knob [B] counterclockwise with your right hand. NOTE: Never touch the drum surface with your bare hands. Use a sheet of paper between your hand and the drum to avoid contact. 8.
Page 149 31 December 1992 DRUM –To Install– 1. Remove the left [A] and right [B] drum holders from the back side of the main board bracket [C]. 2. Disconnect the transfer [D] and separation [E] connectors. 3. Lift the T/S corona unit [F] and disconnect the ground wire connector [G]. 4.
Page 150 DRUM 31 December 1992 6. Put the new drum [A] with the drum protective sheet [B] on the drum holders [C] as shown. NOTE: The seals [D] on the drum protective sheet must be beneath the drum. 7. Close the middle unit [E] and turn the drum lock knob [F] clockwise until it locks.
Page 151 31 December 1992 DRUM 10. Reinstall the cover plate [A] (1 ground screw). NOTE: The right positioning pin [B] is inserted in the hole [C] while the left positioning pins [D] are inserted in the holes [E]. 11. Reinstall the pick-off pawl unit [F] (2 knob screws and 2 connectors). NOTE: Make sure the two positioning pins [G] are inserted in the two holes [H] of the pick-off pawl unit.
Page 152 CORONA 31 December 1992 4. CORONA 4.1 CHARGE CORONA WIRE AND GRID WIRE REPLACEMENT 1. Remove the drum. (See Drum Replacement.) NOTE: Cover the drum with paper to prevent the drum from being exposed to light. 2. Disconnect the ground lead [A] and remove the "+" shoulder screw [B] securing the right charge corona cover [C].
Page 153 31 December 1992 CORONA 5. Remove the left [A] and right [B] gird holders. 6. Remove the 4 grid wires [C] (4 springs). 7. Remove the grid wire terminal [D] (1 screw). 8. Remove the left [E] and right [F] endblock covers. 9.
Page 154 CORONA 31 December 1992 11. Reinstall the wire cleaner [A]. NOTE: Make sure that the corona wire [B] is positioned between the cleaner pads [C]. 12. Reinstall the endblock-covers and grid wire terminal. 13. Install 4 new grid wires [D] and grid holders [E]. NOTE: 1) Make sure that the wires are correctly placed on the eight slots [F] and in the eight holes [G].
Page 155 31 December 1992 CORONA 4.2 CHARGE GRID VOLTAGE ADJUSTMENT VR201 ADJUSTMENT STANDARD Adjusting VR –460 ± 2 V VR201 1. Remove the middle right and left cover. 2. Set the multimeter range to dc 1500 V and connect the multimeter leads as shown.
Page 156: Drum Current Adjustment
CORONA 31 December 1992 4.3 DRUM CURRENT ADJUSTMENT NOTE: a) The drum currents vary with environmental conditions such as humidity and atmospheric pressure. Generally it is not necessary to adjust the drum currents because they have already been adjusted for a wide range of environments at the factory. b) Drum current adjustment is necessary whenever the power packs are replaced;...
Page 157 31 December 1992 CORONA NOTE: Do steps 3 and 4 before adjusting the transfer corona current or separation corona current. 3. Install the current measuring drum [A]. NOTE: 1) Position the connectors [B] to the right side as shown. 2) The harness leads should be positioned as close as possible to the development roller [C] so that they are not in the way of any corona units.
Page 158 CORONA 31 December 1992 4.3.2 Charge Corona Current Adjustment VR101 ADJUSTMENT STANDARD Adjusting VR DC 1.1 ± 0.01 mA VR101 1. Turn off the main switch. 2. Disconnect the Charge/Grid/Bias power pack connector [A] from the charge corona terminal [B]. 3.
Page 159 31 December 1992 CORONA 4.3.3 Transfer Corona Current Adjustment ADJUSTMENT STANDARD Adjusting VR Low (normal): DC –120 ± 5 µA DC –250 + 5/–10 µA High: 1. Turn off the main switch. 2. Remove the lower rear cover [A] (5 screws) and upper rear cover [B] (4 screws).
Page 160 CORONA 31 December 1992 8. Adjust the low (normal) transfer corona current to –120 ± 5 µA by turning T1 on the Transfer/Separation power pack [A]. 9. Turn off the main switch. 10. Select dc 2 mA on the digital multimeter. 11.
Page 161 31 December 1992 CORONA 4.3.4 Separation Corona Current Adjustment ADJUSTMENT STANDARD Adjusting VR AC 220 ± 5 µA DC –10 + 0.5 µA 1. Turn off the main switch. 2. Remove the lower rear cover [A] (5 screws) and upper rear cover [B] (4 screws).
Page 162 CORONA 31 December 1992 8. Adjust the ac separation corona current to 220 ± 5 µA by turning D1 on the Transfer/Separation power pack [A]. 9. Turn off the main switch. 10. Select dc 200 µA on the digital multimeter. 11.
Page 163: Developer Removal
31 December 1992 DEVELOPMENT 5. DEVELOPMENT 5.1 DEVELOPER REMOVAL NOTE: When replacing the developer, make sure that the drum is must be installed. 1. Remove the middle right cover. (See Middle Right Cover Removal.) 2. Open the main board bracket (1 knob screw). 3.
Page 164 DEVELOPMENT 31 December 1992 8. Turn on the main switch. 9. Turn on the DPS101-7 and 101-8 on the main board to enter the output check mode. 10. Enter output check No.1 to turn on the development motor. (See Output Check Mode Access Procedure.) The development rollers will start turning and the remaining developer [A] inside the development unit will pour out onto the paper [B].
Page 165 31 December 1992 DEVELOPMENT 5.2 TONER DENSITY SENSOR VOLTAGE ADJUSTMENT ADJUSTMENT STANDARD Adjusting VR 4 ± 0.1 V VR105 SP#35 NOTE: This adjustment must be done only when the new developer is installed. 1. Remove the middle right cover. 2. Turn on the main switch. 3.
Page 166 DEVELOPMENT 31 December 1992 5.3 DEVELOPMENT FILTER REMOVAL 1. Open the middle unit. 2. Remove the middle right cover. 3. Open the main board bracket (1 screw). 4. Remove the development filter [A] (1 screw). 5-26...
Page 167 31 December 1992 DEVELOPMENT 5.4 DEVELOPER DISTRIBUTION ADJUSTMENT NOTE: If uneven image density appears on copies or the service call code "Ed" is displayed, this adjustment is required. 1. Open the original feed unit. 2. Open the toner cartridge cover and take out the toner cartridge. 3.
Page 168: Toner Density Sensor Replacement
DEVELOPMENT 31 December 1992 5.5 TONER DENSITY SENSOR REPLACEMENT 1. Open the middle unit. 2. Open the toner cartridge cover and take out the toner cartridge. 3. Remove the development filter. (See Development Filter Removal.) 4. Remove the original exit guide [A] (2 screws). 5.
Page 169: Development Bias Voltage Adjustment
31 December 1992 DEVELOPMENT 5.6 DEVELOPMENT BIAS VOLTAGE ADJUSTMENT ADJUSTMENT STANDARD Adjusting VR DC –200 ± 2 V VR301 1. Remove the middle right and left cover. 2. Set the multimeter range to dc 1500 V and connect the multimeter leads as shown.
Page 170: Toner Supply Clutch Lubrication
DEVELOPMENT 31 December 1992 5.7 TONER SUPPLY CLUTCH LUBRICATION 1. Remove the C/B/G power pack unit [A] (4 screws, 3 terminals, and 4 connectors) and the development motor unit [B] (5 screws). 2. Remove the toner supply clutch [C] (2 Allen screws) and take it apart. 3.
Page 171: Doctor Gap Adjustment
31 December 1992 DEVELOPMENT 5.8 DOCTOR GAP ADJUSTMENT Both ends..0.5 ± 0.05 mm ADJUSTMENT STANDARD Center....0.35 ± 0.05 mm CAUTION: The doctor gap was adjusted at the factory using special tools. Therefore, this adjustment is not normally required in the field. This adjustment is required only when the development roller, mixing auger or paddle roller is replaced.
Page 172 DEVELOPMENT 31 December 1992 9. Remove the front exposure glass holder [A] (4 screws). NOTE: Do not loosen the two paint locked screws securing the holder. 10. Loosen the two screws [B] securing the doctor blade [C]. 11. Insert the 0.35 mm DG gauge [D] in the center position of the doctor gap. 12.
Page 173 31 December 1992 DEVELOPMENT 5.9 PHOTOCONDUCTOR GAP ADJUSTMENT 1.0 ± 0.1 mm ADJUSTMENT STANDARD CAUTION: The photoconductor gap was adjusted at the factory using special tools. Therefore, this adjustment is not normally required in the field. This adjustment is required only when the development roller, mixing auger or paddle roller is replaced.
Page 174 DEVELOPMENT 31 December 1992 7. Remove the front left cover [A], and remove the development motor [B] (5 screws). 8. Loosen the adjustment screws [C][D] at both ends of the development roller [E]. 9. Insert the 1.0 mm thickness gauge [F] between the drum and the development roller.
Page 175 31 December 1992 DEVELOPMENT 5.10 DEVELOPMENT ROLLER REPLACEMENT 1. Remove the developer. (See Developer Removal.) 2. Remove the exposure glass. (See Exposure Glass Removal.) 3. Remove the fiber optics array unit. (See Fiber Optics Array Removal.) 4. Remove the exposure lamp. (See Exposure Lamp Replacement.) 5.
Page 176 DEVELOPMENT 31 December 1992 9. Remove the front exposure glass holder [A] (4 screws). NOTE: Do not loosen the two paint locked screws securing the holder. 10. Remove the doctor blade [B] (2 screws and 1 connector). 11. Take out the toner cartridge. 12.
Page 177 31 December 1992 DEVELOPMENT 14. Remove the lamp regulator/CBG power pack assembly [A] (4 screws, 3 terminals, and 4 connectors). 15. Remove the front left cover [B] and remove the development motor [C] (5 screws). 16. Disconnect the bias terminal [D] (1 screw). 17.
Page 178 DEVELOPMENT 31 December 1992 19. Open the main board bracket (1 screw). NOTE: Mark the original position of the magnet adjusting plate [A] before removing the plate. 20. Remove the magnet adjustment plate (2 screws). 21. Remove the right positioning gear [B] (1 screw and 1 spacer). 22.
Page 179 31 December 1992 DEVELOPMENT 26. Peel off the side seal and pull out the development roller [A]. 27. After replacing the development roller, put the side seal at the same location on the new roller. 28. Adjust the doctor gap and the photoconductor gap. (See Doctor Gap Adjustment and Photoconductor Gap Adjustment.) 5-39...
Page 180 DEVELOPMENT 31 December 1992 5.11 PADDLE ROLLER REPLACEMENT 1. Remove the development roller. (See Development Roller Replacement.) 2. Remove the paddle roller bearing [A] and drive gear [B]. 3. Remove the right [C] paddle roller shaft (1 E-rings, 1 spacer, 1 bushing) and replace the paddle roller [D].
Page 181: Cleaning Blade Replacement
31 December 1992 CLEANING CLEANING CLEANING BLADE REPLACEMENT 1. Remove the drum. (See Drum Replacement.) NOTE: Cover the drum with paper to prevent the drum from being exposed to light. 2. Place a sheet of A1 size (D size) paper [A] on the paper transport section. 3.
Page 182: Used Toner Removal
CLEANING 31 December 1992 USED TONER REMOVAL 1. Remove the middle right cover and open the main board [A] (1 screw). 2. Open the used toner tank cover [B] (1 screw). 3. Disconnect the toner overflow sensor connector [C]. 4. Turn the toner collection lever [D] counterclockwise and pull out the used toner tank [E].
Page 183 31 December 1992 QUENCHING QUENCHING QUENCHING LAMP CLEANING 1. Remove the charge corona unit. (See Charge Corona Wire Replacement.) 2. Clean the quenching lamp [A] with a blower brush [B]. 5-43...
Page 184: Quenching Lamp Replacement
QUENCHING 31 December 1992 QUENCHING LAMP REPLACEMENT 1. Remove the middle left and middle right covers. 2. Remove the left and right horizontal covers. (See Left and Right Horizontal Cover Removal.) 3. Remove the cooling fan motor [A] (2 screws and 1 connector). 4.
Page 185: Paper Feed
31 December 1992 PAPER FEED PAPER FEED PAPER FEED CLUTCH LUBRICATION 1. Open the middle unit. 2. Remove the left inner cover [A] (7 screws). 3. Remove the clutch collar [B] (Loosen 2 allen screws). 4. Remove the clutch sleeve [C] and spring clutch [D]. 5.
Page 186 PAPER FEED 31 December 1992 1ST/2ND FEED SENSOR REPLACEMENT 1. Remove the middle right cover. 2. Remove the upper guide plate [A] (2 screws). 3. Remove the 1st feed sensor bracket [B] with the paper stopper solenoid [C] (2 screws and 2 connectors). 4.
Page 187: Registration Sensor Replacement
31 December 1992 PAPER FEED REGISTRATION SENSOR REPLACEMENT 1. Remove the middle right cover. 2. Remove the cover plate [A] (1 screw). 3. Remove the registration sensor bracket [B] (2 screws and 1 connector). 4. Remove the sensor [C] from the bracket (2 screws). 5-47...
Page 188: Fusing Unit Removal
FUSING 31 December 1992 FUSING FUSING UNIT REMOVAL 1. Make sure that the main switch is turned off and the power supply cord is unplugged. 2. Open the middle unit and the original feed unit. 3. Remove the middle right, top right, front right and the right horizontal covers.
Page 189 31 December 1992 FUSING [F] [M] 13. Open the exit guide unit [A]. 14. Remove the left [B] and right [C] screws securing the exit guide unit. 15. Remove a ground screw [D]. 16. Disconnect the two connectors [E]. 17. Slide the exit guide unit to the left (rear view) and take it out from the copier frame.
Page 190 FUSING 31 December 1992 21. Disconnect the two connectors [A] and remove the paper exit unit [B]. 22. Remove the lower rear cover [C] (5 screws) and upper rear cover [D] (4 screws). 23. Remove the small left [E] and right [F] covers (2 screws each). 24.
Page 191 31 December 1992 FUSING 27. Close the middle unit. 28. Remove the fusing drive chain [A] from the hot roller gear [B]. 29. Remove the fusing lamp connector [C]. 30. Remove the hot roller thermistor connector [D] and the pressure roller thermistor connector [E].
Page 192: Fusing Lamp Replacement
FUSING 31 December 1992 FUSING LAMP REPLACEMENT 1. Remove the fusing unit. (See Fusing Unit Removal.) 2. Disconnect the lamp connector [A]. 3. Remove the right lamp holder [B] (1 screw). 4. Remove the 2 wire clamps [C] from the left fusing frame (1 screw each). 5.
Page 193 31 December 1992 FUSING HOT ROLLER/PRESSURE ROLLER REPLACEMENT 1. Remove the fusing unit. (See Fusing Unit Removal.) 2. Remove the fusing lamp. (See Fusing Lamp Replacement.) 3. Remove the fusing upper cover [A] (4 screws) and the exit guide plate [B] (4 screws).
Page 194: Fusing Thermofuse Replacement
FUSING 31 December 1992 FUSING THERMOFUSE REPLACEMENT 1. Remove the fusing unit. (See Fusing Unit Removal.) 2. Remove the fusing upper cover (4 screws). 3. Take the thermofuse harness [A] out from the clamps [B] (7 clamps, 1 screw each). 4.
Page 195 31 December 1992 FUSING HOT ROLLER/PRESSURE ROLLER THERMISTOR REPLACEMENT [H] [F] 1. Remove the fusing unit. (See Fusing Unit Removal.) 2. Remove the fusing upper cover (4 screws). 3. Take the hot roller thermistor wire out from the clamps [A] (3 clamps, 1 screw each) and remove the hot roller thermistor holder [B] (2 screws).
Page 196 FUSING 31 December 1992 FUSING PRESSURE DISTRIBUTION ADJUSTMENT 1. Remove the fusing unit. (See Fusing Unit Removal.) 2. Remove the hot roller and the pressure roller [A]. (See Hot Roller/Pressure Roller Replacement.) 3. Slide the pressure roller shaft [B] out from the pressure roller. 4.
Page 197: Copy Quality Adjustment
31 December 1992 COPY QUALITY ADJUSTMENT 10. COPY QUALITY ADJUSTMENT – General Information – Image density is affected by the following factors: (1) Light Intensity (2) Bias Voltage (3) Toner Density (4) Grid Voltage (5) Charge Corona Current The items listed above must be kept in balance to maintain correct image density.
Page 198: Light Sensor Adjustment
COPY QUALITY ADJUSTMENT 31 December 1992 10.1 LIGHT SENSOR ADJUSTMENT 1. Every Call 2. When replacing the following part When: • Exposure lamp • Light sensor • Drum • RAM on the main board Purpose: To maintain the correct light intensity. Level 2 (10%) of the 9 step gray scale on the OS- Adjustment A1 chart should be slightly visible when the 7th...
Page 199: Image Bias Adjustment
31 December 1992 COPY QUALITY ADJUSTMENT 10.2 IMAGE BIAS ADJUSTMENT 1. The image is blurred even though the image density in black solid areas is acceptable. When: 2. Dirty background, where the problem is not caused by excess toner and cannot be solved by adjusting the light sensor voltage.
Page 200: Toner Density Adjustment
COPY QUALITY ADJUSTMENT 31 December 1992 10.3 TONER DENSITY ADJUSTMENT Customer wants to change the overall image When: density of the copies. To change toner concentration inside Purpose: development unit. Perform: SP #18 Change the development bias voltage for the ID How: sensor pattern by SP #18 10.4 TONER SUPPLY RATIO SELECTION...
Page 201 31 December 1992 COPY QUALITY ADJUSTMENT 10.5 ID SENSOR VOLTAGE (Vsg) ADJUSTMENT 1. Check Vsg at every call, and adjust Vsg if it is not within the adjustment standard. 2. At replacement of the following parts: • ID sensor When: •...
Page 202: Ads (Auto Image Density Sensor) Adjustment
COPY QUALITY ADJUSTMENT 31 December 1992 10.6 ADS (Auto Image Density Sensor) ADJUSTMENT When: ADS voltage is not within the adjustment standard. Purpose: To maintain correct ADS mode operation. ADS Reference Voltage = 3.0 ± 0.1 volts Adjustment Standard: Perform: SP #37 Change the ADS reference voltage by VR103.
Page 203: Registration Adjustment
31 December 1992 COPY QUALITY ADJUSTMENT 10.7 REGISTRATION ADJUSTMENT 10.7.1 Registration Adjustment for Manual Feed and Sheet Feeder When: Registration is not within the adjustment standard. Purpose: To maintain proper registration. 0 ± 2 mm (0 ± 0.08") Adjustment Stand- ard: SP #26 (0.25 mm/step, 9 steps) or Perform:...
Page 204 COPY QUALITY ADJUSTMENT 31 December 1992 10.7.2 Registration Adjustment for Roll Feeder. When: Registration is not within the adjustment standard. Purpose: To maintain proper registration. 0 ± 3 mm (0 ± 0.12") Adjustment Standard: SP #78 (0.25 mm/step, 9 steps) or Perform: SP #79 (1 mm/step, 10 steps) Change the registration roller start timing by SP...
Page 205: Original Skew Adjustment
31 December 1992 COPY QUALITY ADJUSTMENT 10.8 ORIGINAL SKEW ADJUSTMENT When: Original skew is not within the adjustment standard Purpose: To correct skew 0 ± 2 mm (0 ± 0.08")/400 mm (15.7")..A1 Sideways Adjustment (10 multi copies) 0 ± 2.5 mm (0 ± 0.10")/400 mm (15.7")... A0 Lengthwise Standard: (5 multi copies) Perform:...
Page 206 COPY QUALITY ADJUSTMENT 31 December 1992 6. Loosen the screw [A] securing the tension bracket [B] and move the bracket upward. 7. Loosen the four screws [C] securing the rear turn guide bracket [D]. 8. Turn the eccentric cam [E] clockwise or counterclockwise. Copy paper Copy image If copy image...
Page 207 31 December 1992 OTHERS 11. OTHERS 11.1 LOWER OZONE FILTER REPLACEMENT NOTE: If the sheet feed is not installed, skip step 1. 1. Open the sheet feeder unit [A] and remove the safety switch cover [B] (2 screws). 2. Open the middle unit. 3.
Page 208 OTHERS 31 December 1992 11.2 ORIGINAL ENTRANCE SENSOR AND SWITCH BACK GATE SENSOR 1. Open the original feed unit. 2. Remove the top right cover. 3. Set the rear original table [A] to the down position. 4. Remove the original feed rear cover [B] (3 screws). 5.
Page 209: Troubleshooting
SECTION 6 TROUBLESHOOTING...
Page 210 31 December 1992 TROUBLESHOOTING FOR COPY IMAGE 1. TROUBLESHOOTING FOR COPY IMAGE 1.1 ABNORMAL COPY IMAGE 1.1.1 Low Image Density (Entire Copy Image) Is toner supplied to the development unit? Toner the cartridge set properly? Set the toner cartridge properly or replace the cartridge if broken. Toner density in the development tank may be too low.
Page 211 TROUBLESHOOTING FOR COPY IMAGE 31 December 1992 1.1.3 Uneven Copy Image Developer level in the development unit? Developer may not be level in the development unit. ⇒ Check and correct the machine level. Charge corona height may not be even. ⇒...
Page 212: Dirty Background
31 December 1992 TROUBLESHOOTING FOR COPY IMAGE 1.2 DIRTY BACKGROUND 1.2.1 Dirty Background (entire Copy Image) Is the original background pure white? Was ADS or Manual ID control selected? Manual Is image density of solid areas high? Light intensity may be too low. ⇒...
Page 213 TROUBLESHOOTING FOR COPY IMAGE 31 December 1992 1.2.2 Partial Dirty Background Does the dirty background area change position at each copy cycle? Is image density of solid areas high? Dirty optics or foreign material may obstruct the light path. ⇒ Clean optics and check the light path. Cleaning function may not work properly.
Page 214 31 December 1992 TROUBLESHOOTING FOR COPY IMAGE 1.2.3 Dirty Background Band Vertical band? Horizontal band? The fusing rollers may be dirty if background only appears at the copy leading edge. ⇒ Clean or replace fusing rollers. Lead from development unit if bands occur at 37 mm intervals. ⇒...
Page 215 TROUBLESHOOTING FOR COPY IMAGE 31 December 1992 1.2.4 Dirty Background Lines Vertical lines? Horizontals? The fusing rollers may be dirty if lines appear only at the copy leading edge. ⇒ Clean and/or replace the fusing rollers. Drum scratch if lines appear 251 mm interval. ⇒...
Page 216 31 December 1992 TROUBLESHOOTING FOR COPY IMAGE 1.3 VOID COPY IMAGE 1.3.1 Vertical Void Band Do vertical void bands appear only on solid areas (not on half tone image areas)? Charge corona wire may be dirty. ⇒ Clean or replace transfer corona wire. Transfer corona wire may be dirty.
Page 217 TROUBLESHOOTING FOR COPY IMAGE 31 December 1992 1.3.3 Partial Void Image Paper wrinkling at void area? Does paper wrinkling still occur after replacing paper? Does paper wrinkling still occur when using manual feed? Check and repair the paper feed and transfer section. Paper has absorbed moisture.
Page 218 31 December 1992 TROUBLESHOOTING SC CODES 2. TROUBLESHOOTING SC CODES 2.1 SERVICE CALL (SC) CONDITION 2.1.1 SC Code E2 - Fusing Thermofuse Open Definition: The temperature detected by the hot roller thermistor does not reach 100°C within 4 minutes after the main switch is turned on. <Points to check>...
Page 219 TROUBLESHOOTING SC CODES 31 December 1992 2.1.4 SC Code E5 - Pressure Roller Thermistor Open Definition: The resistance of the pressure roller thermistor is more than 1 mΩ within 2 minutes after the main switch is turned on. <Points to check> Pressure roller thermistor •...
Page 220 31 December 1992 TROUBLESHOOTING SC CODES 2.1.8 SC Code EA - Fusing Warm-up Error Definition: The temperature detected by the hot roller thermistor does not reach the tar- get ready temperature within 12 minutes. <Points to check> Hot roller thermistor •...
Page 221 TROUBLESHOOTING SC CODES 31 December 1992 2.1.12 SC Code No Code (SP58) - *Exposure Lamp Abnormal Definition: The light sensor voltage is less than 0.45 volts for 20 seconds. <Points to check> Exposure lamp • Light sensor • Lamp Regulator (CN1-1/CN1-2 for AC input voltage, CN3-1/CN3- •...
Page 222 31 December 1992 TROUBLESHOOTING SC CODES 2.1.14 SC Code No Code (SP61) - *ID Sensor Abnormal Definition: Vsg goes below 2.5 volts or Vsp goes above 2.5 volts. <Points to check> ID sensor • ID sensor pattern • Toner supply mechanism •...
Page 225 9 10 11 12 55 56...
Page 226 Name Index. No. P to P Name Index. No. P to P Location Location Motors Rear Safety Main Toner Cover Development Sheet Feeder Exhaust Fan Rear Feeder Cooling Fan Feed Pressure Vacuum Fan Unit Set Paper Feed Upper Door Cutter Safety Middle Door Magnetic Clutches...
Page 227 Name Index. No. P to P Name Index. No. P to P Location Location Fusing Exit Transfer/ Separation Upper Exit Lower Exit Thermistors Paper Entrance Hot Roller Paper End Pressure Roller Paper End Exposure Lamp Left Cutter Right Cutter Thermofuses Leading Edge Fusing Pulse Generator...

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