Service manual

ER-A242U TEST FUNCTION
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CHAPTER 5. TEST FUNCTION
1. TEST ITEMS
Key turned to PGM. The test items are as follows:
2. DESCRIPTION OF EACH DIAGNOSTIC
PROGRAM
1) DISPLAY BUZZER TEST
1
Key operation
2
Test procedure
The decimal point will shift in steps of 1 digit from the lower digit to
the upper (every 200 m sec).
After that, all segments turn on (about 1 sec)
This mode is 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.
100
2) KEY CODE
1 Key operation
2 Test procedure
3 Check that:
KEY code: Every time a key is pressed, the code of that key is dis-
played 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 SRV mode. The printer prints as follows:
101
3) PRINTER TEST
1 Key operation
2 Test procedure
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
2 Test procedure
The keyboard is checked using the sumcheck data of the key code.
3 Check:
A) The content of completion print
NO. 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 display test
8 110 Drawer 1 open & sensor test
9 120 External RAM test
10 121 CPU internal RAM test
11 140 CPU internal ROM test
12 160 AD conversion port test
13 500 RS232C test
14 550 Sleep mode test
RCPT/PO100
Display at operator side 1.2.3.4.5.6.7.8.9.0.
Display at front side 4.5.6.7.8.9.0.
Display at operator side 8.8.8.8.8.8.8.8.8.8.
Display at front side 8.8.8.8.8.8.8.
RCPT/PO101
Display
KEY CODE
RCPT/PO102
Display 1234567890
ZZZZZZ ----------------ZZZZZ
ZZZZZZ ----------------ZZZZZ
ZZZZZZ ----------------ZZZZZ
3 lines of 24 Z's are printed.
RCPT/PO104
Display 104
KEY CODE