Read Sharp ER-A410 / ER-A420 (serv.man3) Service Manual online
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
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