DOWNLOAD Sharp ER-A280 / ER-A280N / ER-A280F (serv.man5) Service Manual ↓ Size: 5.62 MB | Pages: 56 in PDF or view online for FREE

Model
ER-A280 ER-A280N ER-A280F (serv.man5)
Pages
56
Size
5.62 MB
Type
PDF
Document
Service Manual
Brand
Device
ECR / ER-A280 Service Manual
File
er-a280-er-a280n-er-a280f-sm5.pdf
Date
PREV: Sharp ER-A280 / ER-A280N / ER-A280F (serv.man4) Service Manual

Sharp ER-A280 / ER-A280N / ER-A280F (serv.man5) Service Manual ▷ View online

ER-A280F/A280N (V)
HARDWARE DESCRIPTIONS
4 – 9
8)
KEY I/F
KEY control is made by the KEY strobe signal generated from ST3 -
ST0 and the KEY return signal inputted to the G/A. 
The KEY port kind and paper feed operation are monitored directly by
the PCU port. 
KEY return signal
9)
BUZZER
The output of 4kHz is made by the MPU, and the buzzer sound is gen-
erated. 
10) SD I/F
The MPU UART ch1 and the general-purpose port are used for control.
The SD card detect and the write protect information can be checked by
reading the address 2e038h bit 4 and 3. 
11) DRAWER
There are 2ch of DRAWER ports. 
The DRAWER OPEN signal ON time is 45ms (min) to 50ms (max). 
The DRAWER OPEN SENSOR is not supported. 
12) RS232
2ch of D-SUB type I/F and 2ch of RJ-45 type I/F are provided.
13) EFT UNIT UP-I04EF (OPTION) 
This option board is set for the Europe models only. 
Assigned to 29000h - 2A000h on the memory map. Exclusive-use I/F
with RS232 ch1 set on the G/A.
14) A/D CIRCUIT
The A/D value is calculated by referring to the external reference volt-
age of the MPU P104/AN4 VREF and correcting it. 
A voltage of typ. 2.495V (regulator specifications) is supplied to the
MPU P104/AN4 VREF. 
1. Printer head monitor
31.25% of the printer head voltage is supplied to the MPU P101
(AN1). 
15) BACKUP BATTERY
It is recommended that the backup battery is replaced after 5 years of
use, which is an estimated life of the product, where it is used at ambi-
ent temperature under normal conditions. (Replacing a battery is
chargeable.)
However, under the following usage conditions, you are recommended
to replace the battery as required by conditions.
• Using the machine continuously under high temperature conditions
(for about 3 years)
• Resume using the machine after a long period of disuse (for about 1
year)
Area
Address
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bir
1
Bit
0
CS1#
(G/A)
2 B 0 0 0 h -
30000h
2e03ch
K R
_7
K R
_6
K R
_5
K R
_4
K R
_3
K R
_2
K R
_1
K R
_0
Signal name
Port name
I/O
Functional description
BUZZER
MPU P80
O
Operates at BUZZER signal
Out-H 4kHz.
Signal name
Port name
I/O
Functional description
SDTXD
MPU P67
O
Serial output signal for communi-
cation with the SD card
SDRXD
MPU P66
I
Serial input signal for communi-
cation with the SD card
SDCLK
MPU P65
O
Clock signal for communication
with the SD card
SDCS#
MPU P64
O
Select signal for communication
with the SD card
SDPOW
MPU P61
O
The SD CARD I/F buffer circuit is
turned ON. 
Address 2e038h 
Signal name G/A port
I/O
Functional description
Bit4
SDWP
GA GPIO_04 
(READ only)
I
SD CARD Write Protect
check
Bit3
SDCD
GA GPIO_03 
(READ only)
I
S D   C A R D   D E T E C T
check
Head voltage 
monitor 
ER-A280F/A280N (V)
HARDWARE DESCRIPTIONS
4 – 10
5. POWER-RELATED CIRCUIT DESCRIP-
TIONS
1)
RESET/POFF DETECTION/ACOFF DETECTION
“Reset/POFF/ACOFF” in the power circuit decryptions mean as follows:
“Reset” means the reset signal if the MPU.
“POFF” signal means the “POFF#” interruption signal to the MPU port,
and the power OFF signal when viewed from the MPU.
The “ACOFF” signal is the “ACOFF#” interrupt signal to the MPU port,
and the AC POWER OFF signal when viewed from the MPU.
2)
POWER SECTION CONTROL SIGNAL 
6. STAND-BY CONTROL 
The stand-by state is supported by software control. 
Signal
name
Port
name
Functional descriptions
RESET#
MPU
P84/INT2#
• MPU reset signal
•  After canceling reset, the MPU is initialized.
• The whole set including the external RAM
is initialized by executing the master reset
(reset operation + pressing a certain key). 
POFF#
MPU
P82/INT0#
•  Power off (POFF) detection signal 
• Within 10msec from Low level of POFF#,
the MPU completes the service interruption
process.
• Under the condition below, it goes into the
state below.When there is no power supply,
it becomes Low level.
•  When there is no power supply, it becomes
Low level.
ACOFF#
MPU P81
•  Not used.
Signal
name
Port
name
Functional description
DEVRES# MPU
•  Device reset signal
• After completion of service interruption pro-
cess, the MPU drives DEVRES# to LOW
level. As a result, the SRAM goes into the
sleep state. It must be driven to LOW level
within 10msec from POFF LOW. 
LCDON
G/A
•  LCD backlight power ON signal
• Only when the G/A turns ON LCDON (High
level), the LCD backlight lights up. 
•  The brightness can be adjusted by PWM con-
trol.
ER-A280F/A280N (V)
DIAGNOSTIC PROGRAM
5 – 1
CHAPTER 5. DIAGNOSTIC PROGRAM
1. TEST ITEMS
The test items are as follows:
Caution:
1.  The software timer should not be used.
(It may be used if there is no problem in the operations when
the operating frequency is changed.)
2.   Do not enter the sleep mode during the diag operation. 
(Except for the sleep mode diag.)
3.   Unless otherwise specified, the receipt print and the journal
print are the same.)
2. STARTING DIAG
1.
Execute MASTER RESET. (Refer to CHAPTER3)
2.
Immediately after MASTER RESET, select DIAGNOSTIC PRO-
GRAM on the LCD screen. The password entry menu is displayed.
3.
Enter the 4-digit password “907”, and the DIAG initial menu is dis-
played. 
Every time when one digit of the password is entered, “
 
*
 
” is dis-
played on the “_” section of the display. 
If the password is erroneously entered, the display shifts to the
menu after MASTER RESET.
DIAG initial screen
4. Press “TL” key to execute. 
Caution:
•  Do not use the software timer. 
•  Do not enter the sleep mode during execution of diagnostics.
3. DESCRIPTION OF EACH DIAG PROGRAM
Select a SERVICE in the DIAG menu, and the following is displayed on
the LCD.
The selected item among the displayed menu items is highlighted.
Shift the selected item with “
2” “4” keys, and press “TL” key to execute. 
1)
KEY
1. Press a key other than Paper Feed key and TL key,
2. Then press TL key.
3. Take the sum of the pressed key codes in the above process, and
compare it with the proper check sum after pressing the last key. 
Note: If the operation is performed erroneously, press CL key three
times to restart from the beginning. 
After displaying and printing the result, press TL key again to
return to the previous screen. 
• LCD
• PRINT
NO.
TEST CONTENTS
1
KEY
2
SENSOR
3
SD CARD ID READ
4
EFT
5
LED&BUZZ
6
LCD BRIGHTNESS&CONTRAST
7
LCD PATTERN DISPLAY
8
A/D
9
CLOCK
10
USB
11
DRAWER
12
RS232 CH1-CH4
13
PRINTER
14
ROM
15
RAM
PASSWORD?
DIAG MENU
 1 
SERVICE
SERVICE DIAG
1 
KEY
2 SENSOR
3 SD CARD
4 EFT
5 LED&BUZZ
6 LCD
7 A/D
8 CLOCK
 9  DRAWER
11 RS232
11 PRINTER
12 ROM
13 RAM
 
KEY FLAT (NORMAL) 
KEY CODE =XXX 
SUM1=XXXX 
SUM2=YYYY 
OK (NG)
Automatic 
identification
Changes every time when 
SUM key is pressed.
Specified SUM 
Display of the result 
KEY XXXX-YYYY – OK (NG) 
ER-A280F/A280N (V)
DIAGNOSTIC PROGRAM
5 – 2
2)
SENSOR
1.
Check the sensor status.
2.
Press TK key to terminate.
• LCD
• PRINT
3) SD CARD
1.
SD card detection and write protect status are displayed. The SD
card register value is also displayed.
2.
Press TL key to terminate.
• LCD
• PRINT
4)
EFT
The EFT (UPI04EF) is checked. 
1. Set all DIPSW S(W1) to OFF.
2. Turn OFF/ON the power of the ECR with the loop back connector
connected to the RS-232 CH4 , and the EFT is automatically
checked. 
• LCD
When the power is turned ON, the following operations are executed.
1. “LOOP BACK” is displayed and the LOOP BACK tests of ER-DR,
ER-CI, and RS-CS are executed for RS232 CH2. 
2. “DIP SW” is displayed. The operator turns on DIPSW (SW1) from
SWITCH1 to 8 one by one.
3. “ROM” is displayed, and the sum check of the ROM on the UP-
I04EF is executed.
4. “RAM” is displayed, and the write/read check of the RAM on the UP-
I04EF is executed.
Press TL key to terminate the operation.
• LCD 
• PRINT
SENSOR  
CONNECTOR             OK(NG) 
HEAD                          UP(DOWN) 
RECEIPT PAPER       OK(NO) 
JOURNAL PAPER      OK(NO) 
AC INPUT                   OK(NO) 
OK     at     CHK_KEY 
(GPIO_05)= "H"
NG at "L" 
SENSOR  
CONNECTOR             OK(NG) 
HEAD                          UP(DOWN) 
RECEIPT PAPER       OK(NO) 
JOURNAL PAPER      OK(NO) 
AC INPUT                   OK(NO) 
 
SD CARD 
CARD DETECT      YES(NO) 
WRITE PROTECT    YES(NO) 
CID:XXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXX 
CSD:YYYYYYYYYYYYYYYYYYY 
YYYYYYYYYYYYYYYYYYYYYYY 
OCR:ZZZZZZZZ 
 
SD CARD 
CARD DETECT        YES(NO) 
WRITE PROTECT    YES(NO)  
CID:XXXXXXXXXXXXXXXXXXXX  
XXXXXXXXXXXXXXXXXXXXXXX 
CSD:YYYYYYYYYYYYYYYYYYY 
YYYYYYYYYYYYYYYYYYYYYYY  
OCR:ZZZZZZZZ  
After 2 second, plug it again.
EFT
Unplug the AC plug 
from wall outlet. 
 
 
   
 
EFT
LOOPBACK                   OK(NG) 
DIP SW                          OK(NG) 
ROM 27040RBF2I          OK(NG) 
RAM 256K SRAM          OK(NG)
The character string returned 
from the EFT is displayed.
ROM version outputted 
by UP-I04EF 
EFT   
LOOPBACK               OK(NG) 
DIP SW                       OK(NG) 
ROM 27040RBF2I      OK(NG) 
RAM 256K SRAM       OK(NG) 
The character string returned 
from the EFT is displayed.
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