
2-18 Mechanisms and Operation Rev. A
In order to simplify maintenance, signal lines such as motors and sensors (except for the thermal
head signals) are all connected to the switch circuit board assembly-B by the leads and
connectors, and switch circuit board assembly-B is connected by FFC to the main circuit board
unit-A. The switch circuit board assembly-B is affixed to the arm coming out of the main frame.
The control panel LEDs and push-button are mounted on switch circuit board assembly-B.
Main Circuit Board Unit-A
The main circuit board unit-A is made up of the following electrical circuits:
❏ CPU and CPU Peripheral Logic Circuits
CPU
RAM
ROM
Gate array
Reset circuit
❏ M-T88 Control Circuits
Thermal head drive circuit
Paper feed motor drive circuit
Auto cutter drive circuit
Detector circuits
❏ Operation Panel Control Circuits
❏ DIP Switch Read Circuit
❏ Malfunction Protection Circuit
❏ Drawer Kick Control Circuit
Figure 2.4.22 Switch circuit board assembly-B external configuration
Display panel
Switch board assembly-B
Push-button
LED
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