Pan Motor Control Circuit; Mr Amplification Circuit; Pan Position Detector Circuit; Visca Communication With Camera Module - Sony SNC-RZ30N Service Manual

4-2-3. Pan motor Control Circuit

The PWM pulse (PAN_PWM) output from a microcomputer (IC1005) is input to a polarity selector
(IC1008) and inverter (IC1015). The PWM pulse inverted using an inverter (IC1015) is also input to
IC1008. In the polarity selector (IC1008), the polarity of a coil is determined by select signals
(PAN_POL_U, V, and W). This output signal is input to a phase selector (IC1007). In IC1009, the phase
used is selected by select signals (PAN_PHASE_U, V, and W). This output signal and the
PAN_PHASE_U, V, and W signals are input to a motor driver circuit (IC1009, IC1010, and IC1016) to
control a motor.

4-2-4. MR Amplification Circuit

The MR sensor output signal from a pan motor is amplified using an operational amplifier (IC1012)
because it is very small in amount and sent to a microcomputer (IC1005) through a buffer (IC1011).

4-2-5. Pan Position Detector Circuit

When the pan position reaches the end point, a photo-interrupter signal is input from CN1004 (pin 4) and
sent to a microcomputer.

4-2-6. Visca Communication with Camera Module

A microcomputer (IC1005) internally communicates with the microcomputer of a camera module and
controls a camera. A communication signal is passed through the SY-303 board via interface connector
CN1005 (pin 12) on the SY-303 board and sent to the camera module.

4-2-7. Visca Communication with HD6417615

A microcomputer (IC1005) internally communicates with HD6417615 (IC007) and exchanges pan/tilt
control information and camera control information with HD6417615. A communication signal is sent to
interface connector CN1005 (pin 12) on the SY-303 board.

4-2-8. Microcomputer Backup Circuit

The signals that were power failure-detected using a backup switching circuit (IC1104) are input to a
microcomputer (IC1005). The microcomputer (IC1104) detects the state of these signals and shifts to the
sleep mode. The backup switching circuit (IC1104) switches the normal power to the battery power
simultaneously when it detects a power failure. Moreover, the backup switching circuit outputs a reset
signal to reset a microcomputer (IC1005) when the voltage of a battery decreases.
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SNC-RZ30N (E)