09/2007
6-39
Phaser 8860/8860MFP Service Manual
Electrical Troubleshooting, DADF Malfunction
Diagnostics
Initial Issue
7.
Measure between the right most pin under the Ink Loader and (again) the lowest pin on
the AC input connector (J8). If the meter measures 0 ohms, F2 has not been damaged.
8.
The heater triacs are not accessible for measurement and are disconnected from loads if
the switch is off or the system is powered down.
Measuring DC Voltages
1.
Check the Power Supply Status LEDs (
Figure 2
), they should be bright.
2.
If the system is operational, use the Service Diagnostics Monitor Voltages test to check
DC voltage levels.
DADF Malfunction
DADF Lamp Does Not Turn On
1.
Is there power at the DADF? Place media in the DADF input tray. If the paper feeds, the
DADF has power, and the lamp circuit is faulty. Replace the DADF (
REP 1.0.15
).
2.
Is there power at the scanner? Lift the DADF and observe the scanner lamp and scan-
head motion. If the lamp is on and the scanhead moves, the Scanner Power Supply is
operating correctly. Replace the DADF (
REP 1.0.15
).
3.
Is there power to the Exit Module? The Exit Module elevator should cycle up and down
after the Scanner Assembly is raised and lowered. The Exit Module Control Board
receives power from the Scanner Power Supply, so if the elevator cycles the Scanner
Power Supply is operating correctly. Replace the Scanner Assembly (
REP 1.0.11
).
4.
Check the
Scanner Power Supply
.
DADF Does Not Feed Media
1.
Is there power at the DADF? Lift the DADF and verify the DADF lamp is on and the cali-
bration strip moves into position. If so, the Scanner Power Supply is operating correctly.
2.
If there is no power at the DADF, perform Steps 1 and 2 from
Scanner Lamp Does Not
Turn On
.
3.
Run the Service Diagnostics Exercise Feed Motion test. If the test fails, replace the DADF
(
REP 1.0.15
).
4.
Clean or replace the Pick Rollers and Separator Pad.
5.
Check the DADF Front and Upper Cover for obstructions or damage.
6.
Print a Usage Profile and look for repeating DADF or Scanner errors that could cause the
problem.
NOTE:
If the system encounters scanner or document feeder errors, the system can lose
communication with scanner and document feeder. If the system cannot re-establish com-
munication with the document feeder the document feeder will be unable to feed paper.
7.
Replace the DADF (
REP 1.0.15
).
Summary of Contents for Phaser 8860
Page 1: ...705P01205 September 2007 Phaser 8860 8860MFP Service Documentation...
Page 4: ...09 2007 iv Phaser 8860 8860MFP Service Manual Initial Issue Introduction...
Page 28: ...09 2007 1 2 Phaser 8860 8860MFP Service Manual Initial Issue Service Call Procedures...
Page 34: ...09 2007 2 2 Phaser 8860 8860MFP Service Manual Initial Issue Error Messages and Codes...
Page 94: ...09 2007 3 2 Phaser 8860 8860MFP Service Manual Initial Issue Image Quality...
Page 126: ...09 2007 4 2 Phaser 8860 8860MFP Service Manual Initial Issue Repairs and Adjustments...
Page 208: ...09 2007 5 2 Phaser 8860 8860MFP Service Manual Initial Issue Parts List...
Page 222: ...09 2007 6 2 Phaser 8860 8860MFP Service Manual Initial Issue Diagnostics...
Page 274: ...09 2007 7 2 Phaser 8860 8860MFP Service Manual Initial Issue Wiring Data...
Page 294: ...09 2007 8 2 Phaser 8860 8860MFP Service Manual Initial Issue Theory of Operation...
