Samsung DMT300 Series Service Manual page 44

4. Troubleshooting
Error type Error mode
Main PBA None
DC voltage
error
4-15
Checking Method
2) Check the operation of the Door Sensing Switch.
(Remove the connector before measuring.)
: Check the blue wire and the switch connected to the blue wire.
• Normal: OPEN (when the door is open)
• Normal: SHORT (when the door is closed)
Check the DC voltage of the Main PBA.
• Measure the voltage between pin 6 (amber) of the main PBA CN7
connector and pin 7 (pink) of the CN7 connector.
• Normal: 4.5V to 5.5V
Measure the voltage between pin 6 (amber) of the main PBA CN7
•
connector and pin 9 (white) of the CN7 connector.
Normal: 10.5V to 13.0V
•
New PBA
Check the DC voltage of the Main PBA.
• Measure the voltage between pin 6 (amber) of the main PBA CN302
connector and pin 7 (pink) of the CN302 connector.
Normal: 4.5V to 5.5V
•
Measure the voltage between pin 6 (amber) of the main PBA CN302
•
connector and pin 9 (white) of the CN302 connector.
• Normal: 9.5V to 13.0V
Corrective actions
Faulty: Replace the Door Sensing Switch.
•
• Normal: Replace the Main PBA assy.
• Faulty: Replace the Main PBA assy.
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