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(4) Servo control block (MDC-5 board and HN-224
board (2/2))
. MDC-5 board
The MDC-5 board has the two MPUs. MPU1 controls
the mode control and capstan servo system while
communicating with the system control CPU in serial
communication. MPU2 controls the drum servo system
while interfacing with MPU1.
The drum motor and capstan motor are controlled by the
PWM switching drive of the feedback servo systems
between FG and PG pulses and between FG and CTL
pulses, respectively. The threading motor is controlled
by a bidirectional motor driver.
DNV-5
(5) Power supply system (CNB-1 board (2/2),
RE-118 board, and RE-119 board)
. CNB-1 board (2/2)
The input DC 12 V from the battery pack or DC IN
connector is input to the CNB-1 board (2/2) where the
input 12 V passes through a circuit breaker, is turned on
or off by the "POWER" switch and is output as an
UNREG +12 V.
This output voltage is sent not only to the camera and
VTR blocks but also to the RE-119 board.
. RE-118 and RE-119 boards
The RE-118 and RE-119 boards make up a DC-DC
converter. The UNREG +12 V supplied from the CNB-1
board (2/2) is converted to the various output DC
voltages which are sent to the camera and VTR.
The converter system uses an highly efficient PWM
switching regulator system.
The PWM switching regulator is equipped with a short-
circuit protection system which turns off all power
outputs when any of the output power is shorted to
GND. The PWM switching regulator is also equipped
with the cut-off circuit which shuts down the output
power when the input voltage decreases below the
guaranteed operating voltage.
4-3
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