Sharp ER-01PU Especificações descarregar pdf (Página 65)

ER--O1PU

4) Thermal head control

IC14

CPU

Thermal head

drive circuit

DATA OUT

[

/HEADTM

TM1

Thermal head

temperature

TM2

detecting

circuit

IC22

HC244

/EXS1

IC23A

IC23C

/EXS

74HC32

<b ‘eadrmk

IC19 D8

27C040

Selector circuit

@ Thermal head drive circuit

Print data which has been entered through DATA IN in

synchronization with the CLOCK signal is stored in L4TCH ac-

cording to the timing (832 dots) of the LATCH signal. Stored print

data is output by the /STROBEl, /STROBE2, /STROBE3, afid

/STROBE4 signals to energize the heating element, thus performi-

ng printing. Print data (832 dots) is divided by four STROBE

signals into the following four parts before being output.

RECEIPT JOURNAL

ABC......... ABC.........

‘r

‘r T

Dot No.: 1

384

449 - 832

STROBE

DOT No.

Dots/

No.

Strobe

NOTE

/sTRoBE4

1-192

192

ISTROBE3 193-448

256

/sTRoBE2

449-640

192

Excluding dots 385 to 448

(Nonprintable area)

/STROBE1

641-832

192

setting jumper

@ ~ermalhead temperature detecting circuit

By detecting the resistance of the thermalhead thermistor, the

head temperature is calculated to control the conduction pulse

width of the head.

@ Head rank setting jumper

Since the therrnalhead resistance fluctuates, they are classified

into the following four ranks.

For classification into ranks, identify with J1 and J2 soldering on

the pattern of the head unit.

RANK I HEAD RESISTANCE [Q]

J1, J2

! Al— 1171-1255

ISolder J2 alone

IBI

1091-1170 I No solderinq

1011-1090

Solder J1 alone

927-1010 Solder both J1 and J2

@ Solenoid circuit

The state of J1 and J2 is recognized by the selector circuit.

12-7

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 85 86

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