Sharp Retail Network Diagnostics; Srn Self Check - Sharp ER-A750 Service Manual

2 Display
Rear Display Check
3 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-A750
•
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)

1) 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 transmis-
sion/reception 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.
b4 An interruption of send complete cannot be made.
(DMAC TC UP interruption)
b3 An interruption of carrier OFF cannot be made. The
mirror image of carrier OFF shows carrier ON.
b2 An interruption of CTC CH2 or CH3 cannot be made.
(Timer interruption)
b1 ROM sum check error
b0 TAM 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.
b0 An interruption of send complete cannot be made.
(DMAC TC UP interruption)
•
Execute diagnostics command 5. The error status is displayed.
The names and the directions of the signals which are subject
to diagnostics 5 command are as shown in the table below.
Signal name
Power interruption notice
Power interruption ON initialization
Power interruption ON continuation
Power interruption process complete
CH1 reception data present.
CH2 reception data present.
Check that the target bit of two statuses obtained by diagnos-
tics 5 command is "0" for ST1 and "1" for ST2. (The other bits
must be masked.) In the other cases, the error status is dis-
played with the error occurrence bit as "1." The normal bit
shows "0."
The error status from the host to the controller is as shown in
the table below.
b7 Not used. ("0" is always displayed.)
b6 Power interruption notice
b5 Not used. ("0" is always displayed.)
b4 Not used. ("0" is always displayed.)
b3 Not used. ("0" is always displayed.)
b2 Not used. ("0" is always displayed.)
b1 Power ON continuation
b0 Power ON initializing
The error status from the controller to the host is as shown in
the table below.
b7 Not used. ("0" is always displayed.)
b6 Power interruption notice
b5 Not used. ("0" is always displayed.)
b4 CH2 reception data exits.
b3 CH1 reception data exits.
b2 Power interruption process complete
b1 Not used. ("0" is always displayed.)
b0 Not used. ("0" is always displayed.)
2 Display
SRN Self Check
DATA RETRY CNT.=xxx
ACK RETRY CNT.=x
xx
DIAG 0
xxxx—
DIAG 1
xxxx—
_DIAG 5 H C
xx—
DIAG 5 H C
xxx—
3 Terminating procedure
Press the CANCEL key to terminate the check. After terminating,
perform the service reset.
6 – 8
Direction
Host Controller
Host Controller
Host Controller
Host Controller
Host Controller
Host Controller
The number of resending is displayed
in xxx with a decimal number.
In the sequence of b7, b6, ..., b0 from
the left. "1" is displayed in case of an
:xxxx error, and "0" when normal.
In the sequence of b7, b6, ..., b0 from
the left. "1" is displayed in case of an
error, and "0" when normal.
:xxxx
In the sequence of b7, b6, ..., b0 from
the left. "1" is displayed in case of an
error, and "0" when normal.
In the sequence of b7, b6, ..., b0 from
:xxxxxx
the left. "1" is displayed in case of an
error, and "0" when normal.
:xxxxx