Service manual

ManualsBrandsSharp ManualsBusiness equipmentER-A420

ER-A410U/ER-A420U HARDWARE DESCRIPTION

– 13 –

8. POWER

9. FLASH MEMORY REWRITE PROCEDURE

10. DRAWER

The ER-A410/ER-A420 is provided with 2 separate DRAWER ports.

The DRAWER solenoid energizing time is as shown below.

50ms (max) 45ms(min)

11. PRINT RATIO LIMITATION

Max. 288dot/1line x 140line (Corresponds to black background LOGO

print.)

Ave. 108dot/1line or less (Corresponds to 12.5% of all dots.)

12. BUZZER

A piezo type buzzer is used.

The oscillation frequency is 2.048kHz m 0.5kHz.

13. RESET

The RESET signal is generated under the following condition.

1) When the MODE KEY SWITCH is moved from SRV’ to another

position (except for OFF).

14. POFF

The POFF signal is changed from 0 to 1 when the 5V system power

and the 24V system power reach the operating voltage. When they fall

below the operating voltage, the signal is changed from 1 to 0.

POFF, RESET TIMING CHART

15. I/O

<LED Segment Signal> Write

<Serial I/O ch2 receive signal> Read

<LCD Write Data> Write

<Key Return Signal, Key Exchange Signal> Read

<LCD Read Data> Read

<LCD Control Signal/Key Strobe Signal> Write

<Key Return Signal> Read

<LCD Control Signal/Key Strobe Signal> Write

<EFT Data> Write/Read

<EFT Status> Read

IPL from EP-ROM: Set the IPL SW to ON and turn on the power, and

the EP-ROM will be boosted.

The bank of the EP-ROM program is switched

through S-RAM to transfer the program to the

FLASH ROM.

Service interruption should be performed

within 10ms after generation of /POFF.

TRANS.

LM2574 + TR

24V

DRAWER

PRINTER

PQ1CG2032

VLED 5.7V

VCC 5.0V

VDD 5.0V

BATTERY

/POFF detection point