Samsung RS257BABB Service Manual page 45

11. Diagnostics
11-1) If power is not ON
Caution!
At the power of main PCB, the 115V power and a high-voltage over DC
170V occur. Please take care of yourself on repair and measurement.
- Check the connections of main PCB.
- Check the connections between upper
hinge and CABI-door.
- Check the connections between door and
panel PCB.
Start
Is 115V AC fuse down?
Is power 115V
both terminals of CN10?
Is fuse on main PCB down?
Is DC 170V impressed to both
terminals of BD1?
Top S/W 233Y
Is the voltage impressed DC 5.8V
between C and S ?
Is 12V impressed to both
terminals of C102?
Is the load such as relay normal?
Is normal the load, such as
relay?
Is there any PCB soldering, short or broken?
Normal
45
To check the main PCB, please apply
descriptions of operation and
references in the manual.
YES
Check the exchange of fuse and
disconnection cause.
NO
Check the assembly and connection of
electric wires.
YES
Exchange fuse
115V 2A?
NO
Check the PCB pattern and replace BD1.
NO
Replace PCB assembly.
NO
1) Replace D104 (D5S6M).
2) Replace PCB assembly.
NO
Replace REG1(KA7805)
NO
1) Check the assembl y of el e ctri c wi r es and troubl e shoot.
2) Repl a ce the panel PCB.
NO
1) Replace the corresponding relay.
2) Check lead wire for contact.
NO
Replace PCB assembly.