No Power - Samsung DMT SERIES Service Manual

#1. No Power

1-1. No Power
Symptom
ㆍDishwasher will not turn on.
Causes
ㆍNo Voltage at electrical outlet
ㆍSub or main PBA defective
Check Point
Step 1 : Voltage at Electrical Outlet
Check if the voltage at electrical outlet is approximately AC 120V.
The dishwasher should be connected to dedicated breaker
Step 2 : Sub PBA
Check all the connections of the Sub PBA connector.
Check for LED and Input Key Check for LED and Input Key
- Push 'Normal' + 'Heavy' + 'Power Key'
- Push 'Normal' Key 4 times
- Push all key.
If all LEDs do not light, replace sub PBA.
Step 3 : Main PBA (1)
Verify the AC power lines into the Main PBA.
- Measure the voltage between the black wire and
the yellow wire of CN101.
If the voltage is not AC120V, check for bad
connections or open circuits of the power part.
Step 4 : Main PBA (2)
Check for the voltage between pin 4 (orange) of the main PBA CN302 connector and
pin 7 (pink) of the CN301 connector.
The normal voltage : DC 4.5V ~ 5.5V
Check for the voltage between pin 10 (blue) of the main PBA CN302 connector and
pin 9 (white) of the CN302 connector.
The normal voltage : DC 9.5V ~ 12.5V (Power key on)
If the voltage is not normal, replace main PBA.
Voltage at the outlet, sub PBA, main PBA
DC 5.5V ~ 7.0V (Power key off)
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