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4102-P01
DRAM Test
This test checks the validity of DRAM on the System Board. The test
writes patterns of data to DRAM to verify that each bit in memory
can set and read correctly.
To run the DRAM Test:
1. Select DRAM Test from the Diagnostic Menu.
2. If no problems are found, the printer returns immediately to the
Diagnostic Menu.
Access Cover Sensor Test
To run the Access Cover Sensor Test:
1. Turn the power on.
2. Raise the access cover.
The printhead cartridge carrier should move to the center of the
printer (loading position). If this fails, check all cable connections,
sensor switch lever, and carrier transport motor. If the switch is bad,
replace the system board. If the transport motor is bad, replace the
engine frame assembly.
End-of-Forms (EOF) Sensor Test
To run the test:
1. Turn off printer.
2. Insert a single sheet of paper into the sheet feeder to depress
the EOF flag.
3. Turn on printer. Paper ejects from printer.
If paper does not eject from printer, check for a 17 V dc pulse
between J3F and ground as the paper feed motor is running during
the POST sequence. If the voltage is incorrect, replace the system
board. Check paper feed motor for shorts. If motor checks bad,
replace engine frame assembly. Go to
Check" on page
3-4
Service Manual
2-8.
"Paper Feed Service
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