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6. Temperature Controller (Rotary S/W) Circuit
Temperature controlling is carried out by changing ROTARY S/W KNOB assembled inside
the refrigerator from level 1 to level 8.
The voltage of temperature controlling SETTING is divided by combined resistance of DC5V
resistance R503 and resistance value of ROTARY S/W(this is a combined parallel
resistance of R908 and resistance value of ROTARY S/W position) and resistance R502.
Divided voltage is supplied to MICOM through resistance R501 and recognizes temperature
controlling then carries out temperature controlling SETTING.
Input Voltages and Resistance values of MAIN PCB MICOM input unit for ROTARY S/W
contact position of SUB PCB ASS'Y are like below.(In case of resistance value estimation,
connector terminal should be estimated after the connector of MAIN PCB CN01 is
disassembled).
❈
On the above Table, resistance value is not calculated when SUB PCB ASS'Y connecting
line is disconnected or there are any cracks on PCB board.
Class
Voltage
(R502 each end)
Resistance
(CN01 7-8 each end)
1 Step
2 Step
3 Step 4 Step 5 Step
6 Step
7 Step
8 Step Contact Point
(2nd pin) (3rd pin)
(4th pin)
(5th pin)
(6th pin)
(7th pin)
(8th pin)
(9th pin) when opened
4.54
4.16
3.84
3.57
3.33
3.12
2.94
2.77
±
0.15v
±
0.15v
±
0.15v
±
0.15v
±
0.15v
±
0.15v
±
0.15v
±
0.15v
0.1
∼
0.7V
❈
Caution: Number
①
~
⑩
in ROTARY
S/W Circuit shows S/W contact
number.
0
Ω
0.99
㏀±1%
1.96
㏀±1%
2.91
㏀±1%
3.84
㏀±1%
4.76
㏀±1%
5.66
㏀±1%
6.54
㏀±1%
100
㏀±1%