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Operation of Control Parts
2-19 CL-S6621
Major functions of individual components are described below:
(1) AC power supply
Consists of a fuse, a filter circuit to eliminate external electric noise, and a switching type
regulator to transform an AC input to +24V DC output required to drive the printer.
(2) SA, Main PCB
Controls the entire operations of the printer. It consists of CPU, Flash ROM, S-DRAM, FPGA
(Field-Programmable Gate Array), driver circuits, etc.
(a) CPU
The CPU is a microprocessor with 32-bit architecture. The clock fed to the CPU is 16 MHz.
The CPU internally multiplies this 16 MHz by 8 times and uses 128 MHz clock. The CPU
includes cache memory, RAMs, DMA controller, serial I/F, USB function controller, A/D
converter, etc.
(b) Flash ROM
A flash ROM of 64M bits (8M bytes) that stores the firmware and CG (character generator)
(c) S-DRAM (Synchronous dynamic RAM)
An S-DRAM of 256M bits (32M bytes) that is used as working area, input buffer and
download buffer.
(d) FPGA
The FPGA (Field-Programmable Gate Array) incorporates a control circuit for the interface
I/O port, motors, print head, etc.
(e) Serial I/F (RS-232C Driver/Receiver)
This is a circuit to transmit and receive serial data between the printer and the host.
Serial I/F, USB I/F, Parallel I/F (Option), Wired LAN (Option) or Wireless LAN (Option) is
automatically selected when data is received.
(f) USB I/F (High-speed USB2.0 Controller)
This is a circuit to transmit and receive serial data between the printer and the host using
the high-speed USB2.0 I/F.
Serial I/F, USB I/F, Parallel I/F (Option), Wired LAN (Option) or Wireless LAN (Option) is
automatically selected when data is received.
(g) Stepping motor driver
This is a circuit to drive the “SA PF Motor”. The “SA PF Motor” is a stepping motor.
(h) Buzzer
The buzzer is driven when an alarm, etc. occurs.