Dram Test; Serial Wrap Test - Konica Minolta bizhub 4020 Service Manual

To run the Button test:
1. From the Diagnostics menu, navigate to:
HARDWARE TESTS >Button Test
2. With no buttons pressed, a pattern matching the control panel buttons is displayed. Press each
control panel button one at a time, and the panel highlights the represented button in the matching
pattern.
3. Release the button, and the highlight disappears.
4. Press X or Back to exit the test.

DRAM Test

This test checks the validity of DRAM, both standard and optional. The test repeatedly writes patterns of
data to the DRAM to verify that each bit in the memory can be set and read correctly.
To run the DRAM test:
1. From the Diagnostics menu, navigate to:
Hardware Tests >DRAM Test
2. Testing... appears, followed by Resetting the Printer.
3. After the printer resets, the results of the test appear: DRAM Test [x] P:###### F:######.
[x]—Represents the size of the installed DRAM.
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P:######—Represents the number of times the memory test has passed and finished
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successfully, with the maximum pass count being 999,999.
F:#####—Represents the number of times the memory test has failed and finished with errors,
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with the maximum fail count being 999,999.
4. After the maximum pass count or fail count is reached, or when all the DRAM has been tested, the
test stops and the final results appear.

Serial Wrap Test

Use this test to check the operation of the Serial Port Hardware using a wrap plug. Each signal is tested.
If the test fails, replace the controller board.
To run the Serial Wrap Test:
1. Disconnect the serial interface cable, and install the wrap plug.
2. From the Diagnostics menu, navigate to HARDWARE TESTS >Serial Wrap Test.
3. Select the appropriate Serial Wrap Test from the list. Values may include Serial Wrap, Serial 1
Wrap, Serial 2 Wrap, or Serial 3 Wrap. Each time the test finishes, the screen updates with the
result. P and F represent the same numbers for DRAM. 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
bizhub 4020/3320 Service Manual
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