Samsung DMR78 Series Service Manual

Also see for DMR57 Series: User manual Installation guide User manual User manual Installation guide

4. Troubleshooting4-20Error type Errormode Checking Method Corrective actionsPower Relay error None3. Check the driving signals for the power relay: Measure the voltage between pin 6 (amber) and pin1 (black) of the CN7 connector on the main PBA.When the door is open or before the cycle starts.➢ Normal: 10.5 to 13 VAfter the cycle has started by closing the door and➢pressing the Power key. Normal: 1 VNew PBA3-1.Check the driving signals for the power relay: Measure the voltage between pin 6 (amber) and pin1 (black) of the CN302 connector on the main PBA.When the door is open or before the cycle starts.➢ Normal: 9.5 to 13 VAfter the cycle has started by closing the door and➢pressing the Power key. Normal: 1 V- Faulty: Replace the main PBA assy.4. Check the operation of the Power Relay: Start the cycle by pressing the Power Key.Measurethe operation voltage between the terminal (black wire+ black wire) of the Heater Relay and the terminal(yellow wire+ amber wire) of the Power RelayCautionCheck the color of the wires of the Power Relay andthe Heater Relay.Nomral: 120V➢- Faulty: Replace the power relay.Heater Relay Terminal(black wire + black wire)Power Relay Terminal(yellow wire + amber wire)All manuals and user guides at all-guides.com