HP 8550 Service Manual - Page 279
Controlling the belt motor, compares the belt motor clock signal BCLK1 against the rotation
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Controlling the belt motor The belt motor is a dc motor. The microprocessor (Q1) on the DADF controller PCB sends the belt motor drive signal (BMON), belt motor rotation direction signal (BDIR), and belt motor rotation speed control signal (BMPWM) to the drive circuit. When the belt motor begins to rotate, the belt motor clock sensor (S10) sends the belt motor clock signal (BCLK1) to the microprocessor (Q1). In response, the microprocessor (Q1) compares the belt motor clock signal (BCLK1) against the rotation speed stored in memory to vary the belt motor rotation speed control signal (PMPWM) to make a match, causing the belt motor (M3) to rotate at a specific speed at all times. Figure 169. Control of belt motor EN ADF 277
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EN
ADF
277
Controlling the belt motor
The belt motor is a dc motor.
The microprocessor (Q1) on the DADF controller PCB sends the belt
motor drive signal (BMON), belt motor rotation direction signal
(BDIR), and belt motor rotation speed control signal (BMPWM) to the
drive circuit.
When the belt motor begins to rotate, the belt motor clock sensor
(S10) sends the belt motor clock signal (BCLK1) to the
microprocessor (Q1). In response, the microprocessor (Q1)
compares the belt motor clock signal (BCLK1) against the rotation
speed stored in memory to vary the belt motor rotation speed control
signal (PMPWM) to make a match, causing the belt motor (M3) to
rotate at a specific speed at all times.
Figure 169.
Control of belt motor