Chapter 5. Diagnostic Program - Sharp XE-A302 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 display test
8) 110 Drawer 1 open & sensor test
9) 120 External RAM test
10) 121 CPU internal RAM test
11) 130 FLASH ROM test
12) 160 AD conversion port test
13) 500 RS232C test
*Starting DIAG.
Mode switch: PGM
Key operation: Above code + "RCPT/PO" key
Description
XE-A302U DIAGNOSTIC PROGRAM
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2. DESCRIPTION OF EACH DIAG PROGRAM
1) DISPLAY BUZZER TEST
1 Key operation
100 3
RCPT/PO
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:
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
RCPT/PO
2 Test procedure
OP display
K E Y
3 Check:
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 incorrect
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 P G M
4.5.6.7.8.9.0.
C O D E P G M
KEY CODE