Backup Circuit; Board; Tilt Motor Control Circuit; Mr Amplification Circuit - Sony EVI-D100 Service Manual

3-2-9. Backup Circuit

The signal that was power-failure detected using a backup switching circuit (IC1104) is input to pins 32
and 88 of a microcomputer (IC1101). The microcomputer is then put into the sleep mode. After power-
failure detection, the backup switching circuit switches the power supply from the external power and
battery.
3-3. MDR-17 Board

3-3-1. Tilt Motor Control Circuit

A tilt PWM pulse is input to a polarity selector (IC1303) and inverter (IC1301). The PWM pulse inverted
using an inverter is also input to IC1303. In IC1303, the polarity of coil is determined by select signals
(TILT POL U, V, and W). The output signals are input to a phase selector (IC1302). In IC1302, the
phase used is selected using select signals (TILT PHASE U, VV, and W). The output signals, and TILT
PHASE U, V, and W signals are input to the control signal input pin of a microcomputer driver (IC1305
and IC1306) to control the motor.

3-3-2. MR Amplification Circuit

The MR sensor output signal from a motor is amplified using an operational amplifier (IC1304) and sent
through a buffer (IC1307) to a microcomputer (IC1101) on the MDR-16 board.

3-3-3. Tilt Position Detection Circuit

When the tilt position reaches the end point, a signal is output from a photo-interrupter (PH1301 and
PH1302) and sent to the microcomputer (IC1101) on the MDR-16 board.
3-4. SE-616 Board

3-4-1. Pan Position Detection Circuit

When the pan position reaches the end point, a signal is output from a photo-interrupter (PH1401 and
PH1402) and sent to the microcomputer (IC1101) on the MDR-16 board.

3-5. SW-1074 Board

3-5-1. Switch Block

Switch S201 for data saving switches the battery backup ON/OFF operation. Switch S202 switches
channels 1, 2, and 3 of a remote controller.
3-3
EVI-D100/EVI-D100P