Table Of Contents; General; System Configuration; Test System - Sharp ER-A750 Service Manual

CHAPTER 6. DIAGNOSTICS
SPECIFICATIONS
CONTENTS
1. General ..........................................................................................1
2. System configuration .....................................................................1
2-1. Test system.........................................................................1
3. Diagnostics ....................................................................................1
1) Master reset procedure..................................................1
2) Program reset (service reset) procedure .......................1
3-1. Execution of diagnostics .....................................................1
3-2. RAM Diagnostics.................................................................2
1) Standard RAM Check ...................................................2
2) VRAM Check ................................................................2
3) ER-03MB Check ...........................................................3
4) ER-04MB Check ............................................................3
3-3. ROM & SSP Diagnostics.....................................................4
1) Standard ROM Check....................................................4
2) SERVICE ROM Check ..................................................4
3) SSP Check ...................................................................4
3-4. Timer & Keyboard & Clerk Switch Diagnostics ...................5
1) Timer Check .................................................................5
2) Keyboard Check ...........................................................5
3) Clerk SW Check ...........................................................5
3-5. RS232 I/F Diagnostics ........................................................5
1) CHANNEL Check ..........................................................5
2) CH1 Check ....................................................................6
3) CH2 Check ....................................................................6
4) CH3 Check ....................................................................6
5) CH4 Check ....................................................................6
6) CH5 Check ....................................................................6
7) CH6 Check ....................................................................6
8) CH7 Check ....................................................................6
3-6. Liquid Crystal Display Diagnostics ......................................7
1) Liquid Crystal Display Check ........................................7
3-7. Rear Display Diagnostics ....................................................7
1) Rear Display Check ......................................................7
3-8. SHARP Retail Network Diagnostics ....................................8
1) SRN Self Check.............................................................8
2) SRN Flag Send Check...................................................9
3) SRN Data Send Check ..................................................9
4) Data Transmission Check .............................................9
3-9. IrDA & ASK Diagnostics ....................................................10
1) IrDA & ASK Check.......................................................10
2) IrDA & ASK Check (checker mode) .............................10
3) Data Transmission Check (Receive mode) .................10
4) Data Transmission Check (Send mode) ......................11
3-10. Magnetic Card Reader Diagnostics ..................................11
1) Magnetic Card Reader Check ....................................11
3-11. Drawer Diagnostics ...........................................................11
1) Drawer 1 Check ...........................................................11
2) Drawer 2 Check ...........................................................11

1. General

This diagnostics program is used for simplified check of the ER-A750
series operations in servicing.
The diagnostics program is built in the standard ROM.

2. System configuration

2-1. Test system

ER-A750 only

3. Diagnostics

Starting the diagnostics
This diagnostics program is written in the external ROM and executed
by the CPU (H8/510). To operate this program, the following condi-
tions must be satisfied.
1 The power for the logic system is proper.
(+5V, VRAM, VCKDC, POFF, +24V)
2 The input/output pins and the internal logic of the CPU are normal.
In addition, CKDC7, MPCA7, the system bus, and the standard
ROM/RAM are normal.
To start the machine for the first time, perform the master reset.
In order to add an option unit when the machine is normally operat-
ing, perform the program reset.

1) Master reset procedure

1 Turn off the power.
2 Set the CKDC reset switch to RESET position.
3 Turn on the power.
4 While pressing the specified key, set the CKDC reset switch to the
normal position.

2) Program reset (service reset) procedure

1 Turn off the power.
2 Set the CKDC reset switch to RESET position.
3 Turn on the power.
4 Set the CKDC reset switch to the normal position. (Do not press
any key.)

3-1. Execution of diagnostics

To start the diagnostics, select "DIAGNOSTICS" with the cursor in the
menu selection in SRV mode, and press the enter key.
The DIAG MAIN MENU is started and the following menu screen is
display. The cursor position is highlighted. Use
move the cursor. Move the cursor to the process you desire and
press the enter key. The selected individual diagnostics program is
executed. When the individual diagnostics program is completed, the
display returns to the menu screen. To terminate the diagnostics,
press the CANCEL key. Then the display returns to the SRV mode
menu screen.
6 - 1
ER-A750
key and key to