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2.R4 Mechanism employs PWM (Pulse Width Motor) as Capatan Motor Drive Signal in REC or PLAYBACK mode
To improve power consumption value, R4-Mechanism uses PWM signal as Capstan Motor drive signal instead of Linear driving
signal which is used in Z-Mechanism.
CAPSTAN MOTOR DRIVING SIGNAL
Z-Mechanism (Linear drive signal)
R4-Mechanism (PWM drive signal)
PWM CAPSTAN MOTOR DRIVE
Half wave
Full wave
Fig.MD1
ADVANTAGE OF PWM DRIVE
PWM drive turns on the Transistors for half time of duty.
In other than above time, motor is driven with the reverse
electromotive force.
ON / OFF
Always ON
52
A3
A2
A1
B2
B1
B3
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