Chapter 5. Diagnostic Program - Sharp ER-A410 Service Manual

CHAPTER 5. DIAGNOSTIC PROGRAM

1. TEST ITEMS
The test items are as follows:
Code
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
*Starting DIAG.
Mode switch: SRV
key operation: Above code + "TL" key
Description
ER-A410/ER-A420 DIAGNOSTIC PROGRAM
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2. DESCRIPTION OF EACH DIAG PROGRAM
1) DISPLAY BUZZER TEST
1 Key operation
100 3
TL
2 Test procedure
OP display
D I S P
0 1 2 3 4 5 6 7 8 9 A B C D E F
Rear display
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
msec)
After that, all segments will turn on (about 1 sec)
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.
1 0 0
2) KEY CODE
1 Key operation
101 3
TL
2 Test procedure
OP display
C O D E
K E Y
KEYBOARD
3 Check that:
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.
When a key is pressed twice or pressed in an incor-
rect manner, --- will be displayed.
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:
1 0 1
B U Z Z E R S R V
4.5.6.7.8.9.0.
S R V
KEY CODE