Samsung ML-1610XBH Service Manual

Also see for ML-1610 Series: Manual Manual Del Usuario User manual Service manual User guide

Contents

Circuit DescriptionSamsung ElectronicsService Manual 12-3Explanation about the condition of Normal OperationIf the fuser (P3.7) port becomes high, the Q6 is activated. A heat lamp starts operating by the activity.As the temperature of the heat lamp is increased, the resistance value of the thermister is decreased.Therefore, the electric potential of the circled A becomes low.On/Off operation of the Q6 is only controlled by the fuser (P3.7) port because 5(+) of theU11(Comparator) is always higher than 6 (-) within the normal control temperature rage.Functions of the Malfunction Protection:If the fuser port (P3.7) is turned on regardless of controlling due to system malfunction, the tempera-ture of the heat roller goes abnormally high. At this time, the resistance value of the thermister becomeslow.When the resistance value of the thermister becomes low, the electric potential of the circled A gets low,and when the temperature goes over the certain temperature, the comparator (U11) gets a low output.As a result, even though the fuser port is abnormally activated, it is disable to be over the regular tem-perature. For maintaining a regular temperature, a protect circuit consists in it (This protection is set upto start operating at the rage between 205°~210°)12.1.2 PWM ControllerFunction DescriptionPWM TIMER consists of each sub block which has various functions. The sub block is divided based onthis block diagram. The entire diagram of the PWMTIMER is organized as below.PWM TIMER OPERATION is figured out if calculating PHCLK by the value selected by the register settingand the divider. PHCLK is created by count block at the PWM TIMER