9
Two sensors are in the both sides of a heat sink.
There are two ways of checking.
One of way, Remove either sensor and connect the test
resister. Other one, remove both sensors. And one connects
0 ohm and another connects test resistor.
The check of the thermo sensors RN69 and RN70 for Fan
uses a drier etc.
And check the resistance of a sensor. (RN69 and RN70)
Ambient temperature 20 to 30 degrees centigrade: Over 50
ohm
If overheat is detected, 2nd pin of J124 (_HEAT_DET) is led
to GND by a transistor.
Normally, it is high impedance (open-collector).
Function Test Resister Value Temperature
1 Normal 0 - 220 ohm (0 ohm) Under 110 °C
2 Heat Protection (Stand-by) Over 4.7k ohm (10k ohm) Over 110 °C
ǻȳǵȸƸȒȸȈǷȳǯɲ 2 ሖƴƋǓLJƢŵ
౨௹ƴƸʚᡫǓƷ૾ඥƕƋǓLJƢŵ
ƻƱƭƸŴǻȳǵȸǛ༾૾ƣƭƸƣƠƯ౨௹৽৴ǛዓƢǔ૾
ඥŴNjƏƻƱƭƸ
2 Ʒ౨௹৽৴ǛဇƠƯŴɲ૾Ʒǻȳǵȸ
ǛٳƠ༾ƴ˯৽৴
(0) ǛӕǓ˄ƚNjƏ༾૾ƴ౨௹৽৴Ǜ
ዓƢǔ૾ඥƕƋǓLJƢŵ
Heat ဇภࡇǻȳǵȸ RN69 ŴRN70 ƷȁǧȃǯƸภࡇǻȳǵȸ
ƴȉȩǤȤȸƳƲư༏ǛɨƑƯᘍƍLJƢŵ
RN69 ŴRN70 ƷǷȧȸȈƷȁǧȃǯƸ RN69 ŴRN70 Ʒ৽৴
ǛยǓLJƢŵᲢࠝภᲢ
25éᲣư 50 ˌɥᲣ
Heat Protect Ǜ౨ЈƢǔƱŴJ124 Ʒ 2 ဪȔȳ (_HEAT_DET)
ƕȈȩȳǸǹǿư GND ƴࡽƔǕLJƢŵ
ᡫࠝƸȏǤǤȳȔȸȀȳǹ ǪȸȗȳdzȬǯǿȸЈщ ưƢŵ
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