Dell 2135cn Service Manual page 244

Step
Checking the power to the FAN
Disconnect J503 from the PWBA LVPS.
Is the voltage across P503-1pin <=> ground on the PWBA
LVPS, about +24 VDC when the interlock switch (HARN
ASSY INTERLOCK) is pushed?
8
Checking after replacing the PWBA LVPS
Replace the PWBA LVPS. (Refer to Removal 25/
9 Replacement 35.)
Does the error still occur when the power is turned OFF and
ON?
Version 1 2008.02.01
Check
1 - 216
Chapter 1 Troubleshooting
Remedy
Yes
Replace the FAN.
(Refer to Removal
Go to step 9.
26/ Replacement
34.)
Replace the
PWBA MCU.
(Refer to Removal End of work.
31/ Replacement
29.)
No