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