Cpu Fan Control - Samsung R710 Service Manual

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4. Troubleshooting

6) CPU Fan Control

1. Checking the work of FAN
One can turn the fan on & off and check the fan's operational conditions wirhout system
disassembly
Pic (1) Fan off status
- SAFC's default setting is "Fan off" or "Minimum Fan Speed"
- Press "On" in "ON/OFF Control" Fan is turned on to maximum fan speed.
- Press "OFF" in "ON/OFF Control" Fan returns to defalt setting.
2. Checking the normal Working State of FAN Control
Off
Low
Middle 1
Middle 2
Middle 3
High
Pic(3) Adjust FAN State
[Fan Voltage Measurement]
- Read Fan RPM indicated in SAFC
[Fan Voltage Pass/Fail determination]
- If Fan RPM satisfies "rpm spec+/-10%", then Fan test is "PASS"
Pic(2) Fan on status
FAN[RPM]
0
2200
2500
2800
3100
3400
4-23
FAN Input Voltage [V]
Board Level
0
2.8
3.2
3.7
4.2
4.9
System Level
0
3.0
3.4
3.9
4.4
4.9