Samsung NT-R70xxxx Series, Service Manual

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4.
Troubleshooting
6) CPU Fan Control
1) Fan Operation Analysis
- One can turn the fan on & off and check the fan's operational conditions without
system disassembly
Figure (1) Fan off Figure (2) Fan on
- 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 default setting.
2) Fan RPM Pass level.
No Item Mode
rpm Design guideline
SPEC : ± 10%
1 FAN Voltage
Off 0
IDLE 1800 rpm
LOW 2200 rpm
MID 2600 rpm
HIGH 3000 rpm
1단계
2단계
3단계
4단계
Figure (3) Fan Step Control
> 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" .
- This Document can not be used without Samsung's authorization -
Fan rpm : 1800 rpm
SAFC will be upgraded to
include Fan RPM
1st step
2nd step
3rd step
4th step