Blank Page; Blurred Or Fuzzy Print - IBM 3112 Service Manual

correct, replace the engine board.
Connector
J13-1 to J13-4
J13-2 to J13-4
If no other trouble is found replace the HVPS.

Blank Page

Inspect the printhead shutter for proper operation and make sure the
actuator on top of the cartridge is present and extends into the print-
head 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.
Run the Print Test with the RIP Board removed. Make the following volt-
age checks:
Connector
J13-1 to J13-4
J13-2 to J13-4
J13-3 to J13-4
J13-8 to J13-4
If the voltages are not correct replace the engine board.

Blurred or Fuzzy Print

This can be caused by a damaged gear train or by paper slippage in the
16
Service Manual
Voltage while
Printing
+4.5VDC
+4VDC
Voltage while
Printing
Less than
5VDC
Less than
5VDC
(Fluctuates
between
pages)
+1.5VDC
Less than
1VDC
Voltage while
Idling
0VDC
0VDC
Voltage while
Idling
0VDC
0VDC
0VDC
+6VDC