Browse By Category. On this page, you will find the Frequently Asked Questions that servicers have asked about the Ricoh service manuals we sell: Do you supply the actual Ricoh service manuals as instant pdf downloads?
Ricoh has been around since and is the leader of copiers, but does make other products as well. At the end of these paragraphs, you can see the full list Ricoh service manuals we stock, which are available as a PDF download or hard copy. The V L pattern White stuck underneath the original scale is exposed on the drum.
The main control board measures V L through the drum potential sensor and adjusts it to a target value by adjusting the exposure lamp voltage V LAMP. The adjusted exposure lamp voltage V LAMP is stored in memory until the next process control data initial setting.
During the check cycle, the V D and V L patterns are exposed and the drum potential on the area where exposed by each pattern is checked by the potential sensor. Compare the curve of the V D and V L compensated drum potential with the curve of the new drum, they are parallel but the compensated potential is still higher V R than the new drum potential. To prevent dirty backgrounds due to increased residual potential, development bias V BB is applied as follows:.
The following graph shows the sequence of events during process control data initial setting. Potential sensor calibration. By measuring the output of the drum potential sensor when — V and — V are applied to the drum, the sensor output V and V is calibrated automatically See page for details.
V D and V L corrections. Then the V D pattern is measured again and V D is detected again. The above process continues until both V D and V L fall within specifications. In this case, nothing is indicated on the machine but the SC counter is incremented. Development bias is also decided by using V R as follows.
ID sensor pattern potential detection. The details are explained in the development control section see page B: V OUT is within the specification. Developer consists of carrier particles iron and toner particles resin and carbon.
Inside the development unit, developer passes through a magnetic field created by coils inside the toner density sensor. When the toner concentration changes, the voltage output by the sensor changes accordingly. When new developer with the standard toner concentration 2. This is done by changing the gain data, see below. If the data is high, V OUT becomes high, and the sensor output voltage becomes high.
As a result, the sensor characteristic becomes as illustrated by curve A. If the data is low, V OUT becomes low, and the sensor output voltage becomes low. As a result, the sensor characteristic shifts as illustrated by curve C.
Now, the sensor characteristic is illustrated by curve B and the TD sensor initial setting is completed. The selected gain data is stored in memory, and V OUT from the auto gain control circuit stays constant during the toner sensor detection cycle. At every copy cycle, toner density in the developer is detected once. The toner supply amount is calculated at every copy. The toner supply amount is determined by using the following factors. By referring to these factors, the machine recognizes the difference between the current toner concentration and the target toner concentration.
The machine also understands how much toner concentration has changed and predicts how much the toner supply amount will probably change.
By changing the toner supply amount precisely, toner concentration image density is kept at a constant level. The image on the OPC drum changes due to variation of toner chargeability influenced by the environment even if the toner concentration is constant. NOTE: 1 Toner end condition is detected by the toner end sensor see the development section for details.
The ID sensor is located underneath the drum cleaning section. There is no ID sensor pattern in the optics, however, a pattern image is made on the OPC drum by the charge corona unit [B] and the erase lamp [C]. V SG is the ID sensor output when checking the erased drum surface. To compensate for any variation in light intensity from the sensor LED, the reflectivity of both the erased drum surface and the pattern on the drum are checked. V SG is detected every time the machine starts copying.
During V SG detection, the development sleeve rollers do not rotate and no development bias is applied. V SP is detected after copying is completed if 10 or more copies have been made since V SP was last detected.
While developing the ID sensor pattern, ID sensor bias is applied. ID sensor bias is determined during process control data initial setting as follows:. Check the drum potential V P of the latent image created by the charge with — V grid. V IDB is not changed until the next process control data initial setting is done. V REF is updated not only at the above case.
But also during developer initial setting and during process control data initial setting. Whenever V SG falls under 2. Whenever V TD rises over 4. In this condition, the CPU never stops the toner supply. V TD is still detected as usual during the abnormal condition and if its output returns to a normal level, the CPU returns the toner concentration control to normal mode.
Whenever V rises over 0. The drum unit consists of the components as shown in the above illustration. An organic photoconductor drum diameter: mm is used for this model.
Being able to accept a high negative electrical charge in the dark. The electrical resistance of a photoconductor is high in the absence of light. Dissipating the electrical charge when exposed to light.
Exposure to light greatly increases the conductivity of a photoconductor. Dissipating an amount of charge in direct proportion to the intensity of the light.
That is, where stronger light is directed to the photoconductor surface, a smaller voltage remains on the OPC. Being less sensitive to changes in temperature when compared to selenium F type drums. Being less sensitive to changes in rest time light fatigue. This makes it unnecessary to compensate development bias voltage for variations in rest time. This copier uses a double corona wire scorotron system for drum charge. The stainless steel grid plate makes the corona charge uniform and controls the amount of negative charge on the drum surface by applying the negative grid bias voltage.
The exhaust fan [A] located above the fusing unit provides an air flow to the charge corona unit to prevent uneven built-up of negative ions that can cause an uneven charge of the drum surface as shown.
An ozone filter [B] absorbs the ozone O 3 around the drum. The exhaust fan rotates slowly during stand-by and rotates quickly during copying to keep the temperature inside the machine constant. The drum cooling fan cools the drum unit to remove the heat from the duplex tray. To prevent foreign matters from entering the copier inside, a dust protection filter is installed in the entrance [C] of the duct. The flow of air around the charge corona wire may deposit toner particles on the corona wires.
These particles may interfere with charging and cause low density bands on copies. The wire cleaner pads [A] automatically clean the wires to prevent such a problem. The wire cleaner is driven by a dc motor [B]. Normally the wire cleaner [C] is located at the front end position home position. When the wire cleaner moves from the rear to the home position black arrow in the illustration , the wire cleaner pads clean the wires.
There are no home position and return position sensors. The CPU monitors the input voltage 5 V. When the wire cleaner reaches the end, it is stopped and the motor is locked. At this time, input voltage slightly decreases to about 4 V and the CPU judges to rotate the motor in reverse. Welcome to ManualMachine. We have sent a verification link to to complete your registration. Log In Sign Up. Forgot password? Enter your email address and check your inbox.
Please check your email for further instructions. Enter a new password. Information Overall. Zoom: Copying Speed: Warm-up Time:. First Copy Time: 3. A copier Four sheet paper trays Optional 3,sheet large capacity tray 3, AV Floor type 3,sheets large capacity sorter stapler tray A A or Floor type sorter stapler with punch A, A AV Finisher A 3,sheets large capacity tray A AV ERASE The erase lamp illuminates the areas of the charged drum surface that will not be used for the copy image.
The development bias voltage applied to the development roller shaft controls two things: 1 The threshold level if toner is attracted to the drum or toner remains on the development roller.
Exposure Lamp 5. Lens 6. Cleaning Brush 7. Cleaning Blade 8. Quenching Lamp 9. Charge Corona Unit OPC Drum Erase Unit Drum Potential Sensor Toner Hopper Development Unit Pre-Transfer Lamp Pick-up Roller After placing order we'll send You download instructions on Your email address.
See below for delivery information The manual is available only in language s : English. See below for delivery information The manual is available only in language s : English Link to manual will be sent on Your email address after You place order. Write Review. Click to see text excerpt from the manual. Is the non-image area dirty? YesNo Is the optics section dirty?
NoYes Clean the optics. Is the exposure lamp light intensity too weak due to deterioration? NoYes Replace the exposure lamp. Is the development bias applied to the development roller shaft?
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