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Chapter 2 Operating Principles
2-2. Operation of Control Parts
CL-S700/CL-S703/CL-S700R 2-16
Major functions of individual components are described below:
(1) AC Inlet & Power Switch/Filter & Power Supply section
Consists of a fuse, a filter circuit to eliminate external electric noise, and a switching type
regulator to transform an AC input to +5V DC and +24V DC outputs required to drive the
printer.
(2) Main PCB
Controls the entire operations of the printer. It consists of CPU, Flash ROM, S-DRAM, Custom
IC (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
This is a flash ROM of 32M bits (4M bytes) that stores the firmware and CG (character
generator).
(c) S-DRAM (Synchronous dynamic RAM)
This is an S-DRAM of 128M bits (16M bytes) that is used as working area, input buffer and
download buffer.
(d) Custom IC (Gate Array)
The custom IC incorporates a control circuit for the interface I/O port, motor, print head,
etc.
(e) PF motor driver
This is a circuit to drive the PF Motor. The PF Motor is a stepping motor.
(f) Buzzer
The buzzer is driven when an alarm, etc. occurs.
(g) Fan
This is a cooling fan at the left rear of the printer. Rotation of the fan is controlled by the
CPU and the fan rotates during printing. The CPU monitors fan lock signal to check for any
fan abnormality. If the fan stops during printing, ERROR LED blinks and “Error Fan Lock” is
displayed on the operational panel.