Sony HKDV-900 Maintenance Manual page 19

9. RS-422A test
Connect the connector tool(s) to the RS-422A connectors at the rear. (Refer to Section 2-2-1.)
Set the test item number to "09" using the [+]/[_] button, and then press the "STORE" button to activate
a test.
Outputs data from "0h" to "ffh" to the RS-422A connector and test that the same data can be received.
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The states of the test result display that is displayed on the 7SEG LEDs and the LED inside the CON-
TROL SELECT button will change depending on the number of connector tools to be connected.
The states of both LEDs are as follows:
When using the four tools:
Test result 7SEG LED display
OK "PA"
NG "Er"
When using the three tools or less:
Test result 7SEG LED display
OK "Er"
NG "Er"
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If "Er" is displayed, see Section 2-3-11, "Troubleshooting for RS-422A Test Error" to clarify the cause.
To quit the test, and press the "CANCEL" button. The 7SEG LEDs display returns to the test item
number.
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To quit the self diagnostic mode, set the switch S100-8 (J-3) on the CP-364 board back to OFF.
HKDV-900
LED inside the CONTROL SELECT button
All light off.
LED of an abnormal port :
LED of a normal port :
LED inside the CONTROL SELECT button
LED of a port to which the tool is connected :
LED of a port to which the tool is not connected :
LED of a port to which the tool is connected :
LED of a port to which the tool is not connected :
Blinks.
Lights off.
Lights off.
Blinks.
Blinks.
Blinks.
2-2. Self Diagnostic Mode
2-7 (E)