Lexmark C77X, Service Manual

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Service Manual
5061
Serial Wrap Test
Use this test to check the operation of the Serial Port Hardware using a wrap plug. Each signal is tested.
To run the Serial Wrap Test:
1.
Disconnect the serial interface cable, and install the wrap plug.
2.
Select the appropriate Serial Wrap Test from HARDWARE TESTS in the Diagnostics mode. Values
include Serial Wrap , Serial 1 Wrap , Serial 2 Wrap, or Serial 3 Wrap . P and F represent the same
numbers for DRAM.
The power indicator
blinks , indicating the test is running.
3.
This test runs continuously unless canceled by pressing Back ( ) or Stop ( ).
Each time the test finishes, the screen updates with the result. If the test passes, the Pass Count increases by 1.
However, if the test fails, one of the following failure messages appears for approximately three seconds, and
the Fail Count increases by 1:
Receive Status Interrupt Error
Status Error
Receive Data Interrupt Error
Transmit Data Interrupt Error
Transmit Empty Error
Threshold Error
Receive Data Ready Error
Break Interrupt Error
Framing Error
Parity Error
Overrun Error
Data Error
Data 232 Error
Data 422 Error
FIFO Error
DSR Error
DSR PIO Error
DSR Interrupt Error
CTS Error
CTS PIO Error
CTS Interrupt Error
Once the maximum count is reached, the test stops. The power indicator goes on solid and the final results are
displayed.
Press Back ( ) or Stop ( ) to exit the test.