6-4. C Board6-6. MB Board
The C board circuit is the CRT drive circuit.1. Character Display and Internal Signal
The R-signal that is input to CN702 is amplified by aboutGenerator
25 dB and inverted by the cascaded amplifier consisting ofIC1107 is the character generator IC such as menu charac-
Q730, Q732 and Q733, and is sent to the cathode.ters. IC1110 generates the 4:3 marker and the various
This amplifier has the frequency compensation characteris-signals for automatic adjustments.
tics (peaking characteristics) by R733, C730, C776, R746Outputs of the two IC are mixed by IC1100 and is output.
and L730. Q702 is the auto cut-off circuit that allows to
flow the output pulse through R704 via Q735 when Q7022. Serial Communication Driver
is ON.IC1105 is the communication controller for the serial
The reference pulse that is current-to-voltage converted byremote control. It performs the transmission and reception
R704, is input to IC1401 pin-25 through a buffer in the Bof the serial remote communication together with the RS-
board in order to activate the auto cut-off circuit.485 driver of IC1103 and IC1106.
The above-described circuit operations are applied to theIC1108 (communication controller) and IC1109 (RS-232
G-signal and B-signal.driver) performs the transmission and reception of the
OPTION terminals.
6-5. MA Board3. Parallel Remote Control
IC1112 reads out the status of the parallel remote terminal
1. System Controland transfers it to the CPU in the MA board.
IC106 (system control CPU) controls the monitor in
accordance with the program that is installed in IC108
(flash EEPROM). The program in IC108 can be re-written
by the boot loader program in IC106. Various settings are
saved in the SRAM (IC111) that is backed up by battery.
2. Internal Bus inside Monitor
Most blocks of the deflection circuits and the signal
circuits are controlled by the I2C bus that is driven by
IC103 (5/6), (6/6). The I2C bus is controlled of its opera-
tion by controlling the general purpose port of IC106 by
software.
IC112 is an expansion I/O unit that is used to control the
internal bus and the TALLY LED.
3. Connection to Options
The respective option boards are controlled by IC101 (1/4),
(2/4), (3/4), IC103 (1/6), (2/6), (3/6), (4/6) and IC104. The
data communication with the option slot bus uses the
strobe/hand-shake method using the SLOT ID signal. Data
is transferred by MISO/MOSI/SCLK. The MISO/MOSI/
SCLK signal is also used for communication between the
MA board and the MB board.
IC112 is the RS-422 driver that establishes communication
to read the key data or knob information of the internal
controller or the control unit and to turn on/off the LED.
6-6BVM-D14H1U/D14H5U/D14H1E/D14H5E/D14H1A/D14H5A |
ACEC
