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KX-MB2061CXB/KX-MB2061CX2/KX-MB2062CXB
6.9.2.2.
OCP (Over Current Protection) circuit
1. Functions
By parts failure or other reason, if Vref voltage exceeds 0.9V, extreme current is supplied to the motor. This may cause motor
over heat and damage.
To prevent this problem, over current protection circuit is provided.
If Vref voltage becomes over 0.9V, Q522 or Q700 turns on. Then PS signal (pin20 of motor driver) becomes "L" and motor
driver stops output the motor current.
2. Circuit Diagram
Refer to the circuit diagram in Motor current control circuit (P.46).
6.9.2.3.
FB (Flat Bed) Motor Drive Circuit
1. Functions
This motor functions for main operations including FAX transmission, FB copy and PC scan.
This motor feeds CIS unit with synchronizing for reading.
2. Motor operation
During motor driving, pin A8 of IC 300 become "H" level, then motor driver IC502 is activated.
Stepping pulses are output from IC300 pins A9, B9, C9, A10, B10, and C10, causing driver IC502 pin 4, 6, 7 and 9 to drive the
motor coil.
A 1-step rotation of this motor feeds 0.021mm of CIS unit.
3. Circuit Diagram
48
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Troubleshooting
