Apple MC408LL Apple Technician Guide - Page 85

System Runs Hot, Symptoms, Quick Check, Check, Result, Action

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2010-08-03 System Runs Hot Quick Check Symptoms System Runs Hot • System feels very hot • Fan not operating • Fan running fast • System is noisy Quick Check 1. Verify that the vents on the bottom are free of dust and other obstructions that might inhibit proper airflow through the system. 2. Verify that the computer is not exposed to direct sunlight which may heat up the enclosure making it feel hot to the touch. 3. Verify the computer is not running hotter than expected for normal operation. 4. Launch Applications/Utilities/Activity Monitor. Determine whether an application or process is consuming a high percentage of CPU bandwidth. CPU intensive applications can cause the fans to run fast in order to maintain the proper internal system temperatures. If needed, quit the application or restart the system to resolve the issue. 5. Reset SMC by unplugging power cord for ~15 seconds. Deep Dive Check 1. Run latest available service utilities for thermal sensor or fan functional state. Was an error generated? 2. Does noise sound like fan is running faster than expected? 3. Remove bottom cover, disconnect AirPort antenna and remove shield, disconnect and remove fan and rotate its blades. Verify that fan blades spin smoothly without interference from fan housing. Result Action Yes Suspect possible fan or sensor error. Check fan cable connection to the interconnect board. No Go to step 2. Yes Fan running fast. Reset SMC by disconnecting power cord for ~15 seconds then retest. If issue continues go to step 3. No Go to step 3. Yes Fan reseated, blades rotate. No Replace affected fan. Go to step 4. Code X22 Mac mini (Late 2009) Symptom Charts - Mechanical 85

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Mac mini (Late 2009) Symptom Charts — Mechanical
85
2010-08-03
System Runs Hot
Quick Check
Symptoms
Quick Check
System Runs Hot
•
System feels very hot
•
Fan not operating
•
Fan running fast
•
System is noisy
1.
Verify that the vents on the bottom are free of
dust and other obstructions that might inhibit
proper airflow through the system.
2.
Verify that the computer is not exposed to
direct sunlight which may heat up the enclosure
making it feel hot to the touch.
3.
Verify the computer is not running hotter than
expected for normal operation.
4.
Launch Applications/Utilities/Activity Monitor.
Determine whether an application or process is
consuming a high percentage of CPU bandwidth.
CPU intensive applications can cause the fans
to run fast in order to maintain the proper
internal system temperatures. If needed, quit the
application or restart the system to resolve the
issue.
5.
Reset SMC by unplugging power cord for ~15
seconds.
Deep Dive
Check
Result
Action
Code
1.
Run latest available service
utilities for thermal sensor or
fan functional state. Was an
error generated?
Yes
Suspect possible fan or
sensor error. Check fan
cable connection to the
interconnect board.
No
Go to step 2.
2.
Does noise sound like fan is
running faster than expected?
Yes
Fan running fast. Reset SMC
by disconnecting power cord
for ~15 seconds then retest. If
issue continues go to step 3.
No
Go to step 3.
3.
Remove bottom cover,
disconnect AirPort antenna
and remove shield, disconnect
and remove fan and rotate
its blades. Verify that fan
blades spin smoothly without
interference from fan housing.
Yes
Fan reseated, blades rotate.
No
Replace affected fan. Go to
step 4.
X22