6-4
DNW-A220
DNW-A220P
(5) System Control Block and Servo Block (SY-259/259A, SY-260, and SV-194
Boards)
This unit contains two CPUs (SY1 CPU and SY2 CPU) for system control and one CPU (Servo CPU) for
servo control.
SY1 CPU (IC106 on the SY-259/259A board) uses RISC CPU, and the operation clock is 20 MHz.
The SY1 CPU controls the operation below.
Switch and LED control on the control panel
Receive and transmit the signals with external control equipment
Sub-LCD display
Superimposition of characters on the monitor output and LCD monitor
Like SY1 CPU, SY2 CPU (IC108 on the SY-260 board) also uses RISC CPU, and the operation clock is
20 MHz.
The SY2 CPU controls the operation below.
Control of each main board
Self diagnosis of each main board
LTC signal read and write
Servo CPU uses a 16-bit CPU, and the operation clock is 10 MHz.
The servo CPU controls the operation below.
Control of drum and motors
Detection of sensor and FG/PG
The communication between SY1 CPU and SY2 CPU is carried out via the dual port RAM (IC400) on
the SY-259/259A board.
The communication between SY2 CPU and servo CPU is carried out via the dual port RAM (IC300) on
the SV-194 board.
(6) Power Supply Block (RE-150, RE-158, and PSW-63 Boards)
The
+
12 V DC voltage input from the battery or DC IN connector is sent through the breaker on the RE-
158 board to the RE-150 board. The voltage is then turned on and off using the power switch on the
PSW-63 board and sent to each board as an UNREG
+
12 V. Moreover, various DC voltages are generat-
ed using the DC-DC converter based on a synchronous PWM switching regulator and supplied to each
board.