Brother International HL 1850 Service Manual - Page 171

HL-1850/1870N SERVICE MANUAL CHAPTER 6 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 damp. [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 on paper, refer to subsection 3.5 `Paper' in CHAPTER 1. (3) Consumable parts Check if: • The "TONER LOW" message appears on the LCD display on the printer control panel when a toner cartridge is installed in the printer. [If the message appears, replace the cartridge with a new one.] For further information on consumable parts, refer to 1. `CONSUMABLE PARTS' in CHAPTER 5. 6-1