Sharp ER-A770 Service Manual download pdf (Page 20)

3) SSP Check

Check content

By starting this check program, the SSP setting for checking is

automatically performed and the SSP check is executed and the

result is displayed.

The SSP check sets data for check in the vacant space in the

SSP entry register, and deletes the data for check after comple-

tion of checking. Therefore, the already set data are not changed

by this check.

Display

Terminating procedure

After displaying the check result, press the CANCEL key to termi-

nate the check.

3-4. Timer & Keyboard & Clerk Switch Diagnostics

The operation of the clock crystal of CKDC, the keyboard, and the

clerk switch are tested.

When the CANCEL key is pressed, the display returns to the diagnos

tics menu.

1) Timer Check

Check content

The operation of the clock crystal of CKDC9 is checked.

The screen displays "YY/MM/DD & MM:HH:SS". Make sure that

the time displayed is updated.

2) Keyboard Check

Check content

The A770 main body keyboard input test is performed. The posi-

tion code corresponding to the inputted key is displayed in three

digits. The key layout corresponding to the input is displayed on

the LCD screen. Press the corresponding key to input. The display

of the inputted key is changed from white square to black

square and a catch sound is generated.

3) Clerk SW Check (Not used for "U" and "A" version)

Check content

The code of the key which is inserted into the clerk key switch is

displayed in a decimal number.

3-5. RS232 I/F Diagnostics

The main PWB and the option PWB (RS232 interface of ER-A7RS)

are checked. Attach the 9-pin D-Sub loop back connector (UKOG-

6717RCZZ) of wiring in Fig. 3-11.

Fig. 3-11. Wiring diagram of loop back connector (UKOG-6717RCZZ)

The following menu is displayed. The cursor position is highlighted.

Use

key and key to 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 CANCEL key is pressed,

the display returns to the diagnostics menu.

When setting channels of RS232, do not set two or more ports to

one channel. In the ER-A770, max. two units of ER-A7RS can be

installed. In each PWB, do not set two or more ports to the same

channel. If two or more ports should be set to one channel, the

hardware would be destroyed.

1) CHANNEL Check

Check content

The CHANNEL setting of the connected RS232 is displayed. The

display content and the setting of DIP SW for CHANNEL setting

on the RS232 I/F PWB are compared.

Since the RS232 on the main PWB of the ER-A770 is fixed to

CH1 and CH8, that in the ER-A7RS must be set to CH2 ~ CH7.

Relationship between the physical channel and logical

channel of the ER-A770’s RS232.

The ER-A770 comes equipped with 2 channels of the RS232C inter-

face as standard.

These two channels are expressed as physical channels "CH1" and

"CH2" on the cabinet and application. On hardware, however, the

"CH2" is defined as a logical channel "CH8" because it has a different

circuit configuration.

Therefore, the relationship of channel definitions between the cabinet

indication and the RS232 I/F Diag is as shown in the table below.

Cabinet indication Logical channel Definition in Diag. Application

CH1 CH1 CH1 CH1

CH2 CH8 CH8 CH2

SSP Check

SSP (NMI) Check : PASS!!(ERROR!!)

Timer & Keyboard & Clerk SW Diagnostics

DATA & TIME = YY/MM/DD & HH:MM:SS

KEY CODE = *** CLERK CODE = ***

CD 1pin

2pin

3pin

4pin

5pin

6pin

7pin

8pin

9pin

GND

RS232 I/F Diagnostics

CH1 Check

CH2 Check

CH3 Check

CH4 Check

CH5 Check

CH6 Check

CH7 Check

CH8 Check

CHANNEL Check

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 88 89

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Sharp ER-A770 Service Manual Page 20

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