Chapter Iv Maintenance And Troubleshooting; Introduction; Initial Check - Brother HL-820 Service Manual

CHAPTER IV MAINTENANCE AND TROUBLESHOOTING

1.

INTRODUCTION

1.1

Initial Check

(1) Operating environment
Check if :
• The source voltage stays within ±10% from the rated voltage shown on the rating
plate.
• The printer is installed on a solid, level surface.
• The room temperature is maintained between 10°C and 32.5°C. The relative
humidity is maintained between 20% and 80%.
• The printer is not located in a dusty place.
• The printer is not exposed to ammonia fumes or other harmful gases.
• The printer is not located in a hot or humid area (such as near water or a
humidifier).
• The printer is not exposed to direct sunlight.
• The room is well-ventilated.
• The printer is not placed where the ventilation hole of the printer is blocked.
(2) Print paper
Check if :
• A recommended type of print paper is being used. [If the paper is too thick or too
thin, or tends to curl, paper jams or paper feed problems may occur, or printed
images may be blurred.]
• The print paper is damped. [If so, use fresh paper, and check whether the print
quality improves or not.]
• The print paper is short-grained paper or acid paper. [If so, print quality problems
may occur. For further information, refer to paper specifications in Chapter II.]
(3) Consumables
Check if :
• The Toner lamp is not lit on the control panel when a toner cartridge is installed in
the printer. [If the lamp is lit, replace the cartridge with a new one. If blank spots
occur on printouts, take out the drum unit and slowly rock it to redistribute the
toner evenly.]
(4) Others
Condensation:
When the printer is moved from a cold room into a warm room in cold weather,
condensation may occur inside the printer, causing various problems as listed
below:
• Condensation on the optical surfaces such as the scanning mirror, lenses, the
reflection mirror and the protection glass may cause the print image to be light.
• If the photosensitive drum is cold, the electrical resistance of the photosensitive
layer is increased, making it impossible to obtain the correct contrast when
printing.
IV-1