Service manual

7) CH6 Check
Check content
The check procedure, the display, and the terminating procedure
are the same as CH1 Check.
8) CH7 Check
Check content
The check procedure, the display, and the terminating procedure
are the same as CH1 Check.
9) CH8 Check
Check content
When the channel is set, the following check is performed.
• Control signal check
Ern RSn DRn Cin CDn CSn
OFF OFF OFF OFF OFF OFF
OFF ON OFF OFF ON ON
ON OFF ON ON OFF OFF
ON ON ON ON ON ON
The read check of the above inputs.
In the read check, ER and RS are changed over in the above
sequence and the logic states of DR, CI, CD, and CS are
checked.
If the logic differs from that in the table, an error display is made.
"ON" in the table means Active LOW, and "OFF" means Active
HIGH.
The above check is repeated four cycles.
• Data transfer check
The loop back data (256 bytes) of 00H ~ 0FFH are used for
data transfer check. The baud rate is set to 115200BPS.
Display
All the contents of an error must be displayed.
ERROR
No.
ERROR display ERROR content
1 ER-DR:ERROR ER-DR LOOP ERROR
2 ER-CI:ERROR ER-CI LOOP ERROR
3 RS-CD:ERROR RS-CD LOOP ERROR
4 RS-CS:ERROR RS-CS LOOP ERROR
5
6
7
8 TXEMP:ERROR TXEMP is not set.
9 TXEMP INT:ERROR TXEMP interruption is not made.
10 TXRDY:ERROR TXRDY interruption is not made.
11 TXRDY INT:ERROR TXRDY interruption is not made.
12
RCVRDY:ERROR RCVRDY is not set.
(Reception enabled. TR-Q is
generated during check)
13 RCVRDY INT:ERROR RCVRDY interruption is not made.
14
SD-RD:ERROR SD-RD LOOP ERROR (DATA
ERROR)
15
SD-RD:ERROR SD-RD LOOP ERROR
(DATA ERROR, FRAMING
ERROR, etc.)
16
17
Terminating procedure
Press the CANCEL key to terminate the check.
3-6. Liquid Crystal Display Diagnostics
The ER-A770 LCD display is checked.
The test program displays the patterns in the following sequence.
Every time when the ENTER key is pressed, the next pattern is
displayed. When the ENTER key is pressed at the final pattern, or
when the CANCEL key is pressed at the midst of the check, the
display returns to the menu screen.
1) Liquid Crystal Display Check
Check content
The test patterns are displayed in the following sequence. When
the ENTER key is pressed, the next pattern is displayed.
• Black and white pattern at 1 dot pitch
• Reversed pattern of the above
• Vertical stripe pattern at 1 dot pitch
• Reversed pattern of the above
• Horizontal stripe pattern at 1 dot pitch
RS232 CH1 Check
ER-DR : ERROR!!