LQ-2180 Revision A
Operating Principles Control Circuit 26
The following table lists the each function of the main components of
the C272 MAIN board.
Table 2-1. Functions of the Main Board
2.1.2 System Reset Circuit
The reset IC (IC2) outputs a reset signal under the conditions below to
feed back the status to the CPU and the gate array:
† The printer is turned on or off.
† The voltage level drops due to abnormal condition.
Receiving the signal, the CPU and the gate array immediately shut off
the operation of each IC to prevent the printer from falling into abnormal
status caused by unstable power supply.
Figure 2-3. Reset Circuit
IC Name Location Function
CPU IC4
Detects conditions of various sensors and
controls phase change for the CR motor.
Gate Array IC3
Control the functions below:
• Memory management
• Printhead drive
• Phase change for the PF motor
EEPROM IC5
Contains such information as the factory
setting values for the various adjustments
and the operational record of the printer.
ROM IC10 Contains the control program.
RAM IC8
Manages the following functions:
• Buffer used to receive data
• Data Extension
• CPU working area
CG-ROM IC7 Contains font data.
SLA7024M IC11 Constant current drive IC for CR Motor
A2917 IC12 Constant current drive IC for PF Motor
G.A(IC3)
1
2
3
4
PS T592(IC 2)
Vout
MRES
Vcc
GND
CPU(IC4)
23
/R S T
74
/R S T
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