IBM 8681 Hardware Maintenance Manual - Page 200

Error Symptom I/O Fans (all) are not turning, but the CPU fans are turning. I/O Fans (only) continuously running fast. Fan (one only) not running. Fans (multiple) not running. Fans (all) not running. Fans (all) continuously run fast. Note This may be proper operation for a system in an elevated ambient temperature environment. Fans (multiple) run fast and there is no video. FRU/Action 1. Midplane 2. Power control card 1. Power Control Card 1. Swap fans to see if the fan is defective. If the fan still does not run in the new position, replace the fan. 2. Midplane (I/O fan) 3. LED Card (CPU fan) 4. Power Control Card 1. Power control card (if both I/O and CPU fans are not running) 2. Midplane (I/O fans) 3. LED card (CPU fans) 1. Power control card 2. midplane 3. Power supply 4. AC power source 1. Check all power supplies for AC Good and DC Good LEDs. 2. Power control card 3. Front panel cable 4. Front panel assembly 5. I/O function card 6. System Management Adapter 7. I/O board 1. Check all power supplies for AC Good and DC Good LEDs. 2. Check all fans. Swap positions to see if the problem follows the fan. Replace any fans not turning or if their fault LEDs are lit. 3. If all power supply LEDs and all fans are okay, replace FRUs in the following order: a. Operator panel b. Operator panel cable c. System management adapter d. System management adapter cable 192 Netfinity Server HMM