Parallel Wrap Test; Rom Memory Test - Lexmark C720 Service Manual

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Parallel Wrap Test

This test is used with a wrap plug to check operation of the parallel
port hardware. Each parallel signal is tested.
To run the parallel wrap test:
1. Disconnect the parallel interface cable and install the wrap plug
(P/N 1319128).
2. Select the Parallel Wrap Test from the menu.
The power indicator blinks indicating the test is in progress. The
test runs continuously until canceled.
When the test finishes, the screen updates. If the test passes,
the pass count increases by 1, however if the test fails, one of
the following messages display for approximately 3 seconds:
Sync Busy Error
Strobe Interrupt Request Error
Init Busy Error
Host Busy Error
RAM Data AA Error
RAM Data 55 Error
DMA Address Error
DMA Memory Error
Clear Init Rise Error
Autofeed Rising Interrupt Error
False Autofeed Rise Error
Clear Autofeed Fall Error
Once the maximum count is reached the test stops. The power
indicator goes On solid and the final results display.
3. Press Return/Stop to exit the test.

ROM Memory Test

The ROM memory test is used to check the validity of the system
board code and fonts.
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Service Manual
Interrupt Request Error
Init Fail Error
Init Rise Error
RAM Data FF Error
RAM Data 00 Error
DMA Count Error
DMA Interrupt Error
DMA Background Error
False Init Rise Error
Clear Autofeed Rise Error
Autofeed Falling Interrupt Error