Troubleshooting - Samsung RSE8KPAS Service Manual

6. Troubleshooting

6-1) If power is not ON
Caution!
At the power of main PCB, the 230V power and a high-voltage over about
DC 320V occur. Please take care of yourself on repair and measurement.
Check the voltage of CN70 connector
etween NO 3 and NO 13.
- 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 230V AC fuse down?
NO
Is power 230V
both terminals of CN70?
YES
Is fuse on main PCB down?
NO
Is DC 320V impressed to both
terminals of BD1?
YES
Top S/W 233Y
Is the voltage impressed DC 5.8V
between C and S ?
YES
Is 12V impressed
(1000㎌/35V) of C102?
YES
Is 5V impressed of REG1 OUT↔ GND?
YES
Is normal the load, such as
relay?
YES
Is there any PCB soldering, short or broken?
YES
Normal
44
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
250V/ 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
2) Replace the panel PCB.
NO
1) Replace the corresponding relay.
2) Check lead wire for contact.