Chapter 55-15.1 Measurement and Adjustment5.1.1 Initial Checkup5.1.1.1 Initial Check 0008-1741Check the following items before you diagnose malfunction. If any failure isfound, a service engineer is to clear the problem and to give the instructionto a user.1) Installation environmenta. The power voltage is -/+10 % of the rated voltage.b. The printer is securely installed on a level surface.c. The room temperature is kept between 10 and 30 deg C, and the relativehumidity, between 10 and 80 %.d. Avoid sites generating ammonia gas, high temperature or high humidity(near water faucet, kettle, or humidifier), cold places, open flames, dustyarea and sites the wind blows in from the air-conditioning duct.e. Avoid sites exposed to direct sunlight. If unavoidable, advise the customerto hang curtains.f. A well-ventilated place.g. Make sure that the power cord is inserted to the machine and the outletsecurely.2) Paper checksa. The recommended paper for the printer is used.b. Paper is not damp.c. Paper is not dirty.3) Paper setsa. The amount of paper in the pick-up source is within specifications.b. Paper is correctly set on the selected pick-up source.c. The size guides are aligned with paper.4) Cartridge setsa. Make sure the EP-87 toner cartridges in each color are set in the printerproperly.b. Make sure the EP-87 drum cartridge is set in the printer properly.5) Fixing unit setsa. Make sure the fixing unit is set in the printer properly.6) External cover setsa. Make sure the top cover and memory cover are closed securely.7) CondensationDuring winter, if the printer is brought from a cold place such as a warehouseinto a warm room, condensation will appear inside the printer, causing vari-ous problems.Ex.)a. Condensation in the optical system (four-sided mirror, reflective mirror,lens, etc.) will result in a light print image.b. As the photosensitive drum is cold, the resistance of the photoconductivelayer is high; this will lead to incorrect contrast.If condensation appears, either wipe the parts with dry cloth, or leave theprinter on for 10 to 20 minutes.If the toner cartridges are opened soon after being moved from a coldroom to a warm room, condensation may appear inside the cartridge andmay cause various problems.Be sure to instruct the user that it is necessary to leave the printer for oneto two hours at a room temperature to allow it to acclimatize to thetemperature.5.1.2 Test Printing5.1.2.1 Test Print 0008-1742The machine permits printing of engine test prints. Try printing out testprints so that you may use them for identifying the location of a printer error.In test printing, the machine prints out the following text pattern in 4 colors(magenta, cyan, yellow, black):F-5-1To Print out Engine Test Prints- When the machine is in a standby state, press [COLOR START KEY] onthe control panel to generate a color print.- Open the machine's manual feed tray, and press the test print switch [1]found on the front left to generate a single test pattern.F-5-25.1.3 Electrical Adjustment5.1.3.1 Work After Replacing the Laser/Scanner Unit 0008-1740The flash ROM mounted on the SCNT board retains PWM adjustment set-tings that are specific to individual laser/scanner units, requiring you to up-date the settings whenever you have replaced a laser/scanner unit.Be sure to execute PWM adjustment in service mode, thereby updating thePWM settings retained in the flash ROM on the SCNT board.Executing PWM Adjustment1) Press [MENU] and then [#] to enter service mode.2) Go to [#TEXT MODE], and press [OK] and [*] in sequence to start [AD-JUST TEST].3) Press [1] to start PWM adjustment.4) When done, see that the indication has changed to "OK".Yellow Magenta CyanBlackFeeding Direction[1]
