Chapter 5. Test Function - Sharp ER-A450T Service Manual

CHAPTER 5. TEST FUNCTION

1. General
1) This diagnostic program has been developed for diagnosing ma-
chine functions in the field. The program is contained within the
ER-A450S.
The diagnostic program is stored in the external ROM which will
be executed by the CPU (H8/510) which requires the following
diagnostic operations:
a) Proper power supply voltages are mandatory for logic circuits
(+5V, VDD, POFF, +12.5V, +24V).
b) CPU input/output pins, CPU internal logic, CKDC8, MPCA7,
system bus and common ROM/RAM must be working prop-
erly.
2. Operational procedure
To start the diagnostic program, you must enter the following com-
mand.
SRV mode :
XXX CA/AT
Test code
The key assignment must be properly set and the ROM and RAM
must be operating properly to go into this mode. This is necessary
because the control jumps to the program area in the SRV mode. A
master reset must be performed before operating the ECR for the first
time or the ER-03RA is installed. After any other options is installed, a
program reset is required. When the master reset or program reset is
performed, be sure to check the printout on the journal paper.
For Farther details on the MRS procedures, please refer to page 3-1.
3. Test command list
With the SRV mode and the following test code entry, the test start.
CODE
100 Display & Buzzer test
101 Key code & Cashier key test
102 R/J printer test
104 Keyboard test
105 Mode switch test
106 Printer sensor test
108 Calendar osilator test
109 SSP test
110 Drawer open sensor test (For standard drawer)
111 Drawer open sensor test (For remote drawer)
120 Standard RAM test
130 Standard ROM test
150 Printer dot pulse width adjustment
200 Option RAM test
501 RS-232 channel 1 Loop back check
550 RS-232 channel 8 Loop back check
DESCRIPTION
4. Test contents
[1] Display & Buzzer test
1) Key operation
100 CA/AT
2) Functional description
Displays the following message on the front and the rear display
boards.
1. 2. 3. 4. 5. 6. 7. 8. 9. 0.
A decimal point shifts from the lower number of digit by one digit (per
200m sec.).
Next, the display the following segments (for approx. 1 sec.).
8. 8. 8. 8. 8. 8. 8. 8. 8. 8.
The above two kinds of displays repeat continuously.
The buzzer sounds continuously during test.
3) Check items
a) The display must be correctly shown at each position.
b) The luminosity of displays must be uniform and even at each
position.
c) Abnormal buzzer sound indicate a problem.
4) Test termination
Press any key. The test terminates and the test No. and message is
printed
[2] Key code & Cashier key test
1) Key operation
101 CA/AT
2) Functional description
Key code, MRS switch state and Cashier code are displayed.
Cashier code
5 – 1
1 0 0
Key code
(Not used)