Sharp ER-A420 Manuel de service télécharger pdf (Page 12)

ER-A410U/ER-A420U HARDWARE DESCRIPTION

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4-2. HEAD CONTROL

HEAD: 864 dots in all Printable range

RECEIPT side 384 dots

JOURNAL side 384 dots

Related PORT

*When turning off the printer power supply, make sure to turn

/STB1,2,3,4 to “H.”

*Do not turn on without paper.

*THERMAL HEAD power supply control: Turn ON when P81 = ”H”;

turn OFF when at “L.” (The power supply for HEAD and STEPPING

MOTOR is shared.) When printing is finished, (when the motor is

stopped), the power should be turned off.

*Before printing or feeding paper, the A/D conversion is performed in

10ms after the printer head is turned on to make sure the voltage is

stable.

5. A/D CONVERSION

The following three kinds of signals are inputted to the A/D conversion

port of the ER-A410/ER-A420.

<CPU’s PORT>

5-1. PRINTER HEAD TEMPERATURE MONITOR

The voltage divided by the resistor and the thermistor for detecting the

temperature of the printer head is inputted to the AN0 pin. As shown

below, the printer head energizing is controlled.

5-2. PRINTER HEAD VOLTAGE MONITOR

A voltage is supplied by the printer head power supply, passed through

the printer, divided by the resistor, and inputted to AN1 pin. Before

reading the A/D conversion value, turn the VHCOM signal (CPU P81) to

“H” and make sure the voltage is stable. Then read the A/D conversion

value.

The printable voltage range for the printer is 15V~26V. The voltage is

calculated from the AN1 value and the A/D conversion value of the ref-

erence voltage of AN2.

5-3. REFERENCE VOLTAGE

The reference voltage (2.495Vm0.085V) generated by KIA431F is input-

ted to AN2 pin.

469 (DEC) t VREF t 557 (DEC)

VREF 469 (DEC) corresponds to VREF = 2.41V at VCC = 5.25V

VREF 557 (DEC) corresponds to VREF = 2.58V at VCC = 4.75V

No. CPU PORT Signal to be used

30 TXD2 SO

29 RXD2 SI

28 CLK2 PCLK

93 P103 /STRB1

92 P104 /STRB2

91 P105 /STRB3

90 P106 /STRB4

89 P107 LATCH

21 P81 VHCOM

/STB1: 1~288dot: 288 dots in all

/STB2: 289~432dot: 144 dots in all

/STB3: 433~576dot: 144 dots in all

/STB4: 577~864dot: 288 dots in all

Total 864 dots

No. CPU PORT

Signal to

be used

Function

97 AN0 TM PRINTER HEAD TEMPERATURE

MONITOR

95 AN1 VPTEST PRINTER HEAD VOLTAGE MONI-

TOR

94 AN2 VREF REFERENCE VOLTAGE

HEAD

TEMPERATURE

A/D CONVERSION

VALUE (DEC)

OPERATION

-10°C or below 929~1023 MOTOR LOCK

-10°C ~ 0°C 869~928 PRINT IN ENERGIZING

TIME AT 0°C

0°C ~ 70°C 232~868 PRINT IN ENERGIZING

TIME SHOWN IN PR-45

CONTROL SPEC

70°C or above 0~231 MOTOR LOCK

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 43 44

Commentaires sur ces manuels

Chrisacend 30 Apr 2024 | 01:02:48

Hello, im noob :)

Sharp ER-A420 Manuel de service Page 12

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