Chapter 5. Test Function - Sharp ER-A450 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-A450.
The diagnostic program is stored in the external ROM which will be
executed by the CPU (H8/510) which requires the following diag-
nostic 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 properly.
2. Operational procedure
To start the diagnostic program, you must enter the following com-
mand.
®
3-digit test item number key in the SRV mode.
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. After any option 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.
Master reset: Turn power on in the SRV' mode and change it to
the SRV mode with the JF key pressed.
Journal print: MASTER RESET ***
Program reset: Turn power on in the SRV' mode and change it to
the SRV mode.
Journal print: PRG. RESET ***
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 osckllator 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
119 A/D conversion test
200 Option RAM test
500 RS-232 loop back test
DESCRIPTION
4. Test contents
[1] Display & Buzzer test
1) Key operation
100 TL
2) Functional description
Display 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 lower number of digit by one digit (per
200m sec.).
Next, display the following segments (for approx. 1 sec.).
8. 8. 8. 8. 8. 8. 8. 8. 8. 8.
Repeat the above two kinds of displays.
Sound a buzzer 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 posi-
tion.
c) Abnormal buzzer sound is not allowed.
4) Test termination
Press any key. The test terminates with the test and message printed
[2] Key code & Cashier key test
1) Key operation
101 TL
2) Functional description
Key code, MRS switch state and Cashier code are displayed.
5 – 1
1 0 0
Key code
(Not used)
Cashier code