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Inspect the printhead shutter for proper operation and make sure the
actuator on top of the cartridge is present and extends into the
printhead shroud when the printer top cover is closed. A failed
printhead will cause a 931 Service error rather than blank output.
Check the continuity of the HVPS cable. The HVPS and transfer roll
contacts should be clean and spring back when pressed. Make sure
the transfer roll contact under the left bearing is making contact with
the HVPS.
Make the following voltage checks while running the print test
continuously and again while idling.
10R/12R/12C/
12L
J20-1 to J20-4
J20-2 to J20-4
J20-3 to J20-4
J20-8 to J20-4
16
Service Manual
16L
J17-1 to J17-4
J17-2 to J17-4
J17-3 to J17-4
J17-8 to J17-4
Voltage while
Printing
Less than
1VDC
Greater than
1VDC
The meter
should fluctu-
ate slightly
between each
page.
Less than
1VDC
Voltage while
Idling
+21-26VDC
Less than
5VDC
Less than
5VDC
+21-26VDC
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