Serial Wrap Test - Lexmark C920 Service Manual

5056-XXX

Serial Wrap Test

The Serial Wrap Test is used to check the operation of the serial port hardware using a wrap plug. Each serial
signal is tested.
To perform the wrap test, follow these steps:
1.
Disconnect the serial interface cable, and install the serial wrap plug.
2.
Select "HARDWARE TESTS" from the Diagnostics Menu.
3.
In the HARDWARE TESTS menu, select the appropriate serial wrap option.
When a user selects this test, the panel displays "Serial Wrap [x] Testing..." and then transitions to a screen that
shows "P:[xxxxxx] F:[xxxx]" on a separate line. "P" represents the number of times the serial port hardware has
passed the test, and "F" represents the number of times it has failed the test.
The largest number that is displayable by either field is 999,999. Initially, only 4 digits appear for "F"; a fifth and
sixth digit will appear if required.
Each time the printer finishes a test, it increments "P" or "F" by one according to the success or failure of the
serial port hardware.
While the serial port hardware test executes, the power indicator light blinks green. A user can cancel this test by
pressing Stop. When a test is canceled, the panel displays "Serial Wrap [x] Test Canceled". Or, once the
maximum pass count or fail count is reached, the test is stopped, and the final test results are displayed.
If a test fails, one of the following errors is displayed:
•
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
3-12
Service Manual