Sharp ER-A410 / ER-A420 (serv.man3) Service Manual ▷ View online
ER-A410/ER-A420
DIAGNOSTIC PROGRAM
– 15 –
CHAPTER 5. DIAGNOSTIC PROGRAM
1. TEST ITEMS
The test items are as follows:
*
Starting DIAG.
Mode switch: SRV
key operation: Above code + “TL” key
2. DESCRIPTION OF EACH DIAG PROGRAM
1) DISPLAY BUZZER TEST
1
Key operation
100
3
2
Test procedure
The decimal point on the LED and the cursor on the LCD will shift
from the lower digit to the upper digit in steps of 1 digit (every 200
from the lower digit to the upper digit in steps of 1 digit (every 200
msec)
After that, all segments will turn on (about 1 sec)
These two modes are repeated.
These two modes are repeated.
At the same time, the buzzer sounds continuously.
3
Check that:
A) Each position is correctly displayed.
B) The brightness of each number is uniform.
C) The buzzer sound is normal.
4
End of testing
You can exit the test mode by pressing any key. The following is
printed.
printed.
1 0 0
2) KEY CODE
1
Key operation
101
3
2
Test procedure
3
Check that:
4
End of testing
You can exit the test mode by turning the mode switch to a position
other than the PGM mode. The printer prints as follows:
other than the PGM mode. The printer prints as follows:
1 0 1
Code
Description
1)
100
Display buzzer test
2)
101
Key code
3)
102
Printer test
4)
104
Keyboard test
5)
105
Mode switch test
6)
106
Printer sensor test
7)
107
Clock test
8)
110
Drawer 1 open & sensor test
9)
111
Drawer 2 open & sensor test
10)
116
LCD CG test
11)
120
External RAM test
12)
121
CPU internal RAM test
13)
130
FLASH ROM test
14)
160
AD conversion port test
15)
500
RS232 ch1 test
16)
501
RS232 ch2 test
17)
510
EFT self test
KEYBOARD: 1: Normal type 0: Flat type
KEY code:
Every time a key is pressed, the hard code of that key
is displayed as a decimal number.
is displayed as a decimal number.
When a key is pressed twice or pressed in an incor-
rect manner, --- will be displayed.
rect manner, --- will be displayed.
TL
D I S P
B U Z Z E R
S R V
0 1 2 3 4 5 6 7 8 9 A B C D E F
OP display
Rear display
4.5.6.7.8.9.0.
TL
K E Y
C O D E
S R V
OP display
KEY CODE
KEYBOARD
ER-A410/ER-A420
DIAGNOSTIC PROGRAM
– 16 –
3) PRINTER TEST
1
Key operation
102
3
2
Test procedure
At the receipt side, the logo is also printed and the receipt is issued.
3
Check that:
The print is free from contamination, blur, and uneven density.
4
End of testing
The test will end automatically.
4) KEYBOARD TEST
1
Key operation
_ _ _ _104
3
2
KEY check sum code
2
Test procedure
The keyboard is checked using the sum check code of the key
code.
If the sum check code is not entered, the check is made using the
sum check code of the default keyboard arrangement
The sum check data for each model is entered to the front 4 digits
of the DIAG code, and that data is compared with the key data
added until the final key (CA/AT) is pressed.
Both data are the same, the test ends, printing the number given
below.
If both data are different, the printer prints the error message.
3
Check:
A) The content of completion print
4
End of testing
Note: Calculation of key sum check data
Hard codes (hexadecimal number) at the position (excluding
feed key) where there is an input data contact are added.
feed key) where there is an input data contact are added.
However, the end key (TL) is not added.
This data to which hard codes have been added is converted into
a decimal number value, which will become the sum check data
a decimal number value, which will become the sum check data
that will be entered when DIAG is started.
5) MODE SWITCH TEST
1
Key operation
105
3
2
Test procedure
The above X must be read in the correct order. (If the contact is
open, 9 will be displayed.)
3
Check:
The display during testing and the content of the completion print.
4
End of testing
6) PRINTER SENSOR TEST
1
Key operation
106
3
2
Test procedure
Check the status of the paper end sensor and head up sensor.
3
Check the following.
4
End of testing
You can exit the test mode by pressing any key and the printer
prints the following.
1 0 6
7) CLOCK TEST
1
Key operation
107
3
2
Test procedure
3
Check that:
“–“ blinks and the clock counts up.
When the test ends normally:
1 0 4
When an error occurs:
E – ~ –
1 0 4
TL
R / J
P R I N T E R
S R V
OP display
5 lines of 24 digits are printed.
Enlargement
TL
K E Y
B O A R D
S R V
OP display
KEY CODE
1 0 4
When the test ends normally
1 0 5
When an error occurs:
E – ~ –
1 0 5
X: 1 - Paper present at the receipt side
O - No paper at the receipt side
Y: 1 - Paper present at the journal side
O - No paper at the journal side
TL
M O D E
1 0 5
S W
X
S R V
OP display
MODE: SRV_PGM2_PGM1_OFF_OP X/Z_REG_MGR_X1/Z1_X2/Z2__SRV
X :
1
0
0
2
9
3
4
5
6
7
TL
R / J
S E N S O R
S R V
X
Y
OP display
1 0 6
TL
T I M
C H E C K
S R V
OP display
Hour
Blinks at an interval of 0.5 sec.
Min.
Sec.
1 0 7
E R
ER-A410/ER-A420
DIAGNOSTIC PROGRAM
– 17 –
4
End of testing
When any key is pressed, the date and time are printed and the
test mode will be terminated.
8) DRAWER 1 OPEN & SENSOR TEST
1
Key operation
110
3
2
Test procedure
3
Check that:
A) The drawer 1 opens normally.
B) The sensor correctly indicates the status of the drawer 1.
4
End of testing
You can exit the test mode by pressing any key. The printer prints
the following.
the following.
1 1 0
9) DRAWER 2 OPEN & SENSOR TEST
1
Key operation
111
3
2
Test procedure
3
Check that:
A) The drawer 2 opens normally.
B) The sensor correctly indicates the status of the drawer 2.
4
End of testing
You can exit the test mode by pressing any key. The printer prints
the following.
the following.
1 1 1
10) LCD CG TEST
1
Key operation
116
3
2
Test procedure
To check the display CG, 256 pieces of built-in CG's are grouped
into 16 blocks and each 16 characters is displayed on the dot dis-
into 16 blocks and each 16 characters is displayed on the dot dis-
play.
At first, CG code of 00H ~ 0FH is displayed. By pressing any key,
each block is displayed in sequence.
each block is displayed in sequence.
3
Check that:
A) Displays are clear.
B) Free from blur, chip-off, unevenness.
4
End of testing
You can exit the test mode by pressing any key. The printer prints
the following.
1 1 6
11) EXTERNAL RAM TEST
1
Key operation
120
3
2
Test procedure
The standard 256 Kbyte RAM is checked.
The contents of memory must be stored before and after this test.
RAM (08000H~7FFFFH area and 28000H~2FFFFH area) is tested
in the following procedure:
a) Store data in the test areas
b) Write “00H”
c)
Read and compare “00H” and then write”55H”
d) Read and compare “55H” and then write “AAH”
e) Read and compare “AAH”
f)
Restore stored data
If an error occurs at a step, the error is printed.
If any error does not occur, the following addresses are checked in
turns.
Addresses to be checked:
08000H, 08001H, 08002H, 08004H, 08008H, 08010H, 08020H,
08040H, 08080H, 08100H, 08200H, 08400H, 08800H, 09000H,
0A000H, 0C000H, 10000H, 18000H, 28000H (BANK 0),
28000H (BANK 3), 30000H, 40000H
28000H (BANK 3), 30000H, 40000H
3
Check:
A) The completion print.
4
End of testing
The program ends after printing as follows:
When an error occurs, the printer outputs the error message and the
address where the error has occurred in the area
*****
.
107
X X X X X X
X X X X X X
year
month
day
hour
min.
sec.
TL
D R A W E R
S R V
X
OP display
X : O = DRAWER OPENED
C = DRAWER CLOSED
1
TL
D R A W E R
S R V
X
OP display
X : O = DRAWER OPENED
C = DRAWER CLOSED
2
TL
When the test ends normally:
120
When the test end abnormally:
Ex – ~ –
120
*****
x = 1: Data error
x = 2: Address error
X Y
S R V
OP display
"XY" indicates the code at the head of each block
in hexadecimal number.
(Example: 10, A0)
in hexadecimal number.
(Example: 10, A0)
"O" indicates the CG display position.
TL
R A M
S R V
OP display
1 2 0
ER-A410/ER-A420
DIAGNOSTIC PROGRAM
– 18 –
12) CPU INTERNAL RAM TEST
1
Key operation
121
3
2
Test procedure
The test program tests internal RAM (10 Kbytes) of the CPU.
The contents of memory must be stored before and after this test.
The contents of memory must be stored before and after this test.
RAM (00400H ~ 02BFFH area) is tested in the following procedure.
a) Store data in the test area.
b) Write “00H”
c) Read and compare “00H” and then write “55H”
d) Read and compare “55H” and then write “AAH”
e) Read and compare “AAH”
f)
Restore stored data
If an error occurs at a step, the error is printed.
If any error does not occur, the following addresses are checked
If any error does not occur, the following addresses are checked
in turns.
Addresses to be checked:
01000H, 01001H, 01002H, 01004H, 01008H
01010H, 01020H, 01040H, 01080H,
01010H, 01020H, 01040H, 01080H,
01100H, 01200H, 01400H, 01800H,
02000H
3
Check:
The completion print.
4
End of testing
If an error occurs, the printer outputs the error message and the
address where the error has occurred in the area
*****
.
13) FLASH ROM TEST
1
Key operation
130
3
2
Test procedure
The test program checks that the checksum of the flash ROM
(BANK0F80000H ~ FFFFFH).
(BANK0F80000H ~ FFFFFH).
The lower two digits of the checksum should be 10H. (pending)
3
Check:
The completion print.
4
End of testing
The test will automatically be terminated and the printer prints as
follows:
14) AD CONVERSION PORT TEST
1
Key operation
160
3
2
Test procedure
The test program displays the voltage of each AD conversion port.
3
End of testing
You can exit the test mode by pressing any key. The printer prints
the following.
1 6 0
15) RS232 CH1 TEST
Install the RS232 loopback connector.
1
Key operation
500
3
2
Test procedure
The test program checks the control signals.
Data communication check
A loopback test of 256-byte data between is performed.
A loopback test of 256-byte data between is performed.
DATA: $00 - $FF BAUD RATE:9600 BPS
3
Check:
The completion print.
4
End of testing
The test program ends after printing.
When the test ends normally:
121
When the test ends abnormally:
Ex – ~ –
121
*****
x = 1: Data error
x = 2: Address error
When the test ends normally:
130
ROM
********
(Model name)
********
(Version)
When the test ends
abnormally:
abnormally:
E – – ~ – –
130
ROM
********
(Model name)
********
(Version)
TL
R A M
C P U
S R V
OP display
1 2 1
TL
R O M
F L A S H
S R V
OP display
1 3 0
OUTPUT
INPUT
/ER1
/RS1
/DR1
/CI1
/CD1
/CS1
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
ON
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
ON
ON
ON
Completion print
RS TEST
OK
Error print
RS TEST
**NG**ERxx
xx
Contents of error
01
ER DR error
02
ER CI error
03
RS CD error
04
RS CD error
05
SD RD error
DATA error
06
SD RD error
DATA error/framing error
TL
T M
S R V
OP display
Display
1 6 0
=
V R F
S R V
OP display
1 6 0
=
V P T E S T
S R V
OP display
1 6 0
=
Repeat
TL
R S
T E S T
S R V
OP display
5 0 0
2 3 2
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