Interrupt Port Detection Circuit

Figure 2-19 shows the interrupt detection signal assignment block diagram for the CPU.

The CPU includes an interrupt controller, and executes forced interrupt operation in accordance with the priority of the interrupt.

Table 2-18. Interrupt Port Detection Signal Functions

Port

Signal

Function

Operation

NMI

s o

Detects voltage drop at the primary power supply (power off)

Backs up the memory (refer to Section 2.3.3).

INTO

ON LINE

Detects the ON LINE switch.

Switches between ON LINE and OFF LINE.

INT1

ENCAB

Detects the carriage motor encoder output bypass signal (E05A38NA).

Starts interrupt operation for carriage motor position/speed control.

INT2

CL

Detects power supply overload.

Reduce the printing speed (see NOTE).

INT5

COVER SW

Detects the cover open sensor status.

Sets the printer OFF LINE when top cover open is detected.

NOTE: CL is detected for each line. If an overload is detected, printing speed is lowered to one third of normal.

POWER SUPPLY BOARD J" SÖ'

POWER SUPPLY BOARD J" SÖ'

Figure 2-19. CPU Interrupt Port Detection Signal Assignment

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