Dell 2135cn Service Manual page 352

Step
Checking after replacing the TRANSFER ASSY
Replace the TRANSFER ASSY or ADC Sensor. (Refer to
7 Removal 48/Replacement 12.)
Does the error still occur when the power is turned OFF and
ON?
Version 1 2008.02.01
Check
1 - 324
Chapter 1 Troubleshooting
Remedy
Yes
Replace the
PWBA MCU.
(Refer to Removal End of work.
31/ Replacement
29.)
No