Sony IPELA SNC-RZ30N, Service Manual

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4-6
SNC-RZ30N (E)
4-2-9. LED Circuit
The LED control signal from interface connector CN1005 (pin 12) on the SY-303 board is input to the
LED buffer (IC1013) so as to turn on and off the LAN LED (D1004) and POWER LED (D1005).
Usually, the LAN LED (D1004) indicates the Ethernet state, and the POWER LED (D1005) indicates the
power supply state.
4-3. MDR-19 Board
4-3-1. Tilt Motor Control Circuit
The PWM pulse (TILT_PWM) that is output from the microcomputer (IC1005) on the MDR-19 board
through connectors (CN1007 to CN1101 (pin 23)) is input to a polarity selector (IC1102) and inverter
(IC1108). The PWM pulse inverted using an inverter (IC1108) is also input to IC1102. In the polarity
selector (IC1102), the polarity of a coil is determined by select signals (TILT_POL_U, V, and W). This
output signal is input to a phase selector (IC1101). In IC1101, the phase used is selected by select signals
(TILT_PHASE_U, V, and W). This output signal and the TILT_PHASE_U, V, and W signals are input
to a motor driver circuit (IC1103, IC1104, and IC1109) to control a motor.
4-3-2. Tilt Position Detector Circuit
When the tilt position reaches the end point, a signal is output from photo-interrupters (PH1101 and
PH1102) and sent through connectors (CN1101 to CN1007) to the microcomputer (IC1005) on the MDR-
19 board.
4-4. SE-656 Board
4-4-1. Pan Position Detector Circuit
When the pan position reaches the end point, a signal is output from photo-interrupters (PH1201 and
PH1202) and sent through connectors (CN1201 to CN1004 (pin 4)) to the microcomputer (IC1005) on the
MDR-19 board.