Temp. Control Circuit.(Rotary S/W); Freezer Temp. - Samsung SR-61KTC Service Manual

9-5. TEMP. CONTROL CIRCUIT.(ROTARY S/W)

A. FREEZER TEMP.
Temp. control is changed KNOB of contructed ROTARY S/W in the freezer and it is possible the temp. control 1 step
to 8 step.
Temp. control SETTING become partial pressure for R 501 resistance and ROTARY S/W resistance.
(Row composition resistance of resistance charge to R 908 and ROTARY S/W direction)
And partial pressure is delivered to MICOM through R 503 resistance and recognited temp. control and it become
SETTING to temp. contol.
Voltage or resistance charge of MAIN PCB MICOM input for SUB PCB Ass's ROTARY S/W cross spot direction is
same the below.
(When Measure the resistance charge, connector of MAIN PCB CN 30 is separated and measure the connector
terminal.)
Section 1 STEP
(9PIN)
Voltage 2.77
±0.15V
(R504)
Resistance 6.54㏀±
(CN30⑥~⑦) 1%
※ To upside, when measure the resistance charge isn't appeared the resistance in the case SUB PCB ASSY
connection is disconnection or crack situation of PCB board.
2 STEP 3 STEP 4 STEP
(8PIN) (7PIN) (6 PIN)
2.94 3.12 3.33
±0.15V ±0.15V ±0.15V
5.66㏀± 4.76㏀± 3.84㏀±
1% 1% 1%
－30－
※CAUTION
It is appeared the S/W cross spot of ROTARY
S/W circuit ①∼⑩
5 STEP 6 STEP 7 STEP
(5 PIN) (4 PIN) (3PIN)
3.57 3.84 4.16
±0.15V ±0.15V ±0.15V
2.91㏀± 1.96㏀± 0.99㏀±
1% 1% 1%
8 STEP WHEN OPEN
(2 PIN) THE OPEN SPOT
4.54
0.1~ 0.7V
±0.15V
0Ω
100㏀±1%