Samsung DMT300 Series Service Manual page 46

4. Troubleshooting
Error type Error mode
4-17
Checking Method
3) Check the driving signals for the power relay
: Measure the voltage between pin 6 (amber) and pin 1 (black) of the
CN7 connector on the main PBA.
• When the door is open or before the cycle starts.
• Normal: 9.5 to 12.5 V
• After the cycle has started by closing the door and pressing the
Power key.
• Normal: 2 V
4) Check the operation of the Power Relay
: Start the cycle by pressing the Power Key.
Measure the operation voltage between the terminal (black wire + black
wire) of the Heater Relay and the terminal (yellow wire+ amber wire)
of the Power Relay
CAUTION
Check the color of the wires of the Power Relay and the Heater Relay.
• Nomral: 120V
Corrective actions
Faulty: Replace the main PBA assy.
•
Remove Retainer.
Check voltage
• Faulty: Replace the power relay.
He a te r Re la y Te rmina l
P owe r Re la y Te rmina l
(Bla ck wire + Bla ck wire )
(Ye llow wire + Ambe r wire )
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