Rear & Pole Display Diagnostics; Rear & Pole Display Check; Sharp Retail Network Diagnostics; Srn Self Check - Sharp ER-A770 Manual

Reversed pattern of the above
The outermost peripheral of the LCD's active area is displayed
in one-dot line.
"H" pattern. "H" is displayed in 40 digits and 15 lines. The 15th
line only has 39 digits of "H."
Terminating procedure
Press the ENTER key at the final pattern, or press the CANCEL
key to terminate the check.
3-7. Rear & Pole Display Diagnostics
The rear display is checked.
The test program displays the following patterns. When the CANCEL
key is pressed, the display returns to the diagnostics menu.
1) Rear & Pole Display Check
Check content
The test patterns are displayed in the following sequence. When
the ENTER key is pressed, the next pattern is displayed.
(i) The test pattern below is displayed.
0 1 2 3 4 5 6 7 8 9 ; A a B b C
DOT DISPLAY :
0. 1. 2. 3. 4. 5. 6. 7. 8. 9. -.
7SEG DISPLAY :
(ii) The screen displays a test pattern showing that all digits are lit.
Display
Rear Display Check
Terminating procedure
Press the CANCEL key to turn off all the elements of the rear
display.

3-8. SHARP Retail Network Diagnostics

The SRN test is performed.
To perform this test, the following composition is required.
ER-A770
Terminal resistor
Branch (trunk) cable (only for data transfer test)
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 individual diagnostics
program is completed, the display returns to this menu screen. When
the CANCEL key is pressed, the display returns to the diagnostics
menu.
SRN Diagnostics
Self Check
Flag Send Check
Data Send Check
Data Check (Satellite Machine)
Data Check (Master Machine)

SRN Self Check

1)
Check content
The ROM and RAM for SRN are checked, and CTC interruption and
carrier sense are checked. Also ADLC function and transmission/re-
ception DMA check is made by using the self loop function of ADLC
(MC6854). In addition, the other signals are checked. The check
procedure is as follows:
Execute diagnostics command 2. The number of resending is
displayed.
Execute diagnostics command 0. The error status is displayed.
The error status is as shown in the table below. When an error
occurs in this test, the following tests are not performed.
b7 An error occurs. (The error print is always 1.)
b6 An unexpected interruption is made.
b5 A collision is generated.
An interruption of send complete cannot be made.
b4
(DMAC TC UP interruption)
An interruption of carrier OFF cannot be made. The
b3
mirror image of carrier OFF shows carrier ON.
An interruption of CTC CH2 or CH3 cannot be made.
b2
(Timer interruption)
b1 ROM sum check error
b0 RAM error
Execute diagnostics command 1. The error status is displayed.
The error status is as shown in the table below.
b7 An error is generated. (The error print is always 1.)
b6 An unexpected interruption is generated.
b5 DMA sent data and received data are different.
b4 The number of data received in DMA is abnormal.
b3 The number of data transmitted in DMA is abnormal.
b2 An overrun error is generated.
b1 An underrun error is generated.