Dell 3130cn Service Manual page 270

Step
Checking the HARN ASSY R SIDE for continuity
Disconnect P/J28 form the PWBA MCU.
27
Disconnect P/J282 from the HARN ASSY MSI NPP.
Is each cable of P/J28 <=> P/J282 continuous?
Checking the HARNESS ASSY MSI NPP for continuity
Disconnect P/J282 form the HARN ASSY R SIDE.
28 Disconnect P/J2821 from the SENSOR PHOTO (MSI NO
PAPER SENSOR).
Is each cable of P/J282 <=> P/J2821 continuous?
Checking the power to SENSOR PHOTO (MSI NO PAPER
SENSOR)
29 Disconnect P/J28 on the PWBA MCU.
Is the voltage across ground <=> J28-B11pin on the PWBA
MCU, about +3.3 VDC?
Checking the SENSOR PHOTO (MSI NO PAPER SEN-
SOR) for operation
Measure the voltage across ground <=> J28-B13pin on the
30 PWBA MCU.
Does the voltage change, every time the ACTUATOR NO
PAPER MSI of the SENSOR PHOTO (MSI NO PAPER
SENSOR) is operated?
Version 1 2008.02.15
Check
1 - 244
Chapter 1 Troubleshooting
Yes
Go to step 28. HARN ASSY R
Go to step 29. HARN ASSY MSI
Go to step 30. (Refer to Removal
30/Replacement
Replace the
Replace the SEN-
PWBA MCU.
(Refer to Removal
(MSI NO PAPER
30/Replacement
14.)
No
Replace the
SIDE.
Replace the
NPP.
Replace the
PWBA MCU.
14.)
SOR PHOTO
SENSOR).