Samsung RF28R7201 AA Series Service Manual page 81

4) Mid Drawer Room Damper Heater has trouble (OPTION)
ERROR Code
Measure the voltage of Resistance
between #25-#27 after
CN40 connector open / 1350 ohm ± 7%
Initial power
Heater off
MICOM #91
On
condition
3.5V ~ 4.8V 3.5V ~ 4.8V
normal?(about135ohm)
Is MAIN PCB connector
(CN40) inserted correctly?
Working
Is the input voltage of
heater
IC01 MICOM #91 normal?
0V
☞ Checking method of Mid Drawer Room Damper resistance
CN40-"25"(Brown) ↔ "27"(Black)
** Ω∞: Open (wire disconnection, heater disconnection) trouble / 0Ω: Short trouble
Start Start
Is Damper Heater
YES YES
YES YES
YES YES
Normal(recheck)
81
TROUBLESHOOTING
NO
Bad contact of
connector/ insert correctly
NO
1) Wire connector
2) Replace Heater
NO
1) Recheck the wire
2) Replace PCB MAIN
PIN Number