Read Sharp XE-A207 (serv.man3) Service Manual online
XE-A207/A217/A307
DIAGNOSTIC PROGRAM DESCRIPTION
– 35 –
10. RS232C
The RS232C loopback test is performed.
1) Connect the DSUB9pin loopback connector.
2) Select the test item with the [
2 ] / [ 4 ] key.
3) Select “NORMAL.”
4) Conduct the test by pressing the [TL/NS] key.
5) Select “EXIT” to end the test.
• Below is shown the connection diagram of the loopback connector to
be used for RS232C check.
10-1. NORMAL
(1) Test Items
<Check of Control Signals>
It performs the Read and Check of the above input.
<Check of Data Transfer>
The transfer of 256 bytes loop back data of 00H to 0FFH is conducted.
A found error is displayed.
Press the [TL/NS] key to end the test.
Caution: To have printout of test results, as XE-A307 has 2 sheets for
the printer, be sure to use both printers to print it out.
RS232C
CH1
EXIT
LCD display
LCD display
RS232C CH1
NORMAL
5V SUPPLY
EXIT
EXIT
1
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
DCD
RxD
TxD
DTR
GND
DSR
RTS
CTS
RI
RxD
TxD
DTR
GND
DSR
RTS
CTS
RI
FG
FG
Output
Input
DTRn
RTSn
DSRn
RIn
DCDn
CTSn
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
ON
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
ON
ON
ON
No.
Display
1
DTR-DSR
2
DTR-RI
3
RTS-DCD
4
RTS-CTS
5
RI INT
6
DCD INT
7
CTS INT
8
TXEMP
9
TXEMP INT
10
TXRDY
11
TXRDY INT
12
RCVRDY
13
RCVRDY INT
14
SD-RD(DATA)
15
SD-RD(FRAME)
OK
LCD display (when the test result is NG.)
RS232 CH1
NG
DTR-DSR,DTR-RI,
RTS-DCD,RTS-CTS
NG
DTR-DSR,DTR-RI,
RTS-DCD,RTS-CTS
LCD display (when the test result is OK.)
RS232 CH1
Printout (when the test result is NG.)
RS232C CH1 NG---ERROR NO.
Printout (when the test result is OK.)
RS232C CH1 OK
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