Detection Circuits Connected to the Generalpurpose Ports

Figure 2-20 shows a block diagram of the general-purpose ports assigned to detect signals. As shown below, sensor signals from the various mechanisms are assigned to the general-purpose ports of the CPU and the E05A 16GA. The data latched at the general-purpose ports of the E05A 16GA is transferred to the CPU.

Some of the signals from the mechanisms are input to the main board via the driver board.

Table 2-19. General-purpose Ports Assigned to Detect Circuit Signals

Port

Signal Name

Function

Operation

6 G A

IN6

CUT.HP

Detects the cutter home position signal when the optional cutter unit is mounted.

Controls the optional cutter.

P.TRCT

Detects the optional tractor unit.

Controls the optional tractor unit.

IN5

CUTTER

Detects the optional cutter unit installation.

Controls the optional cutter.

PAO

TRCT. SEL

Detects which is selected, the front or rear tractor.

Controls paper feeding (for confirming the front/rear paper switching mechanism; Paper feed error warning).

IN4

GAP A

Detects the platen gap sensor signal.

Controls the PG mechanism (controls the PG measure and PG setup operations by detecting the amount of the PG motor rotation).

IN3

GAP B

c P u

PO 7

HNERR

Detects a defective driver board head driver IC.

(NPN transistor array)

Indicates a head drive error.

P06

HPERR

Detects a defective driver board head driver IC.

(PNP transistor array)

P24

CR. HP.

Detects the carriage home position sensor signal.

Controls the carriage position. Indicates a carriage error.

P25

T.PE

Detects the top paper end sensor signal.

Controls paper feeding (for confirming the paper load/eject operation and front/rear paper switch operation; Paper feed error warning).

P26

F.PE

Detects the front paper end sensor signal.

P33

R.PE

Detects the rear paper end sensor signal.

CUT. H P CUTTER

I CONTROL PANEL

HNERR

HPERR

DRIVER BOARD

PA 1 IN6 IN5

PAO IN4 IN3

-k address

:05A16G

P07 P06 P24 P25 P26 P33

MAIN BOARD

data

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