PART IV
TROUBLESHOOTING - NO POWER
E-39
ENGLISH
Check main circuit board
Step 6
Check main circuit board
transformer
Step 5
Check main circuit board transformer
If the fuse is OK, you will go ahead to check the main circuit board transformer.
1. Set the ohmmeter on AC 200V.
2. Check the red wire voltage, it should read about 110~120V ac.
3. Check the blue wire voltage, it should read about 12V. If it reads 00.0, the transformer has problem. You need to
replace the main circuit board transformer.
Replace the main circuit board transformer
1. Unplug the unit power cord.
2. Unplug the transformer connection from the main circuit board.
3. Unscrew 2 screws from the transformer. When installing the transformer you will do simply the reverse
operation.
1. Unplug the transformer wire
connection from the main circuit
board.
2. Remove 2 screws from the
transformer.
If the ohmmeter reads close to
110V ac, the transformer is OK.
Set the ohmmeter at
the range of 200V ac.
If it reads close to 12V ac, the
transformer is OK.
If you confirm the interlock switch, fuse, main circuit board transformer are OK and all wires are connected tightly, go to
replace the main circuit board. However, you should remember the main circuit board is not easily broken.
To replace main circuit board
see IMPORTANT PART-MAIN
CIRCUIT BOARD on page 19.
Helpful hints
If the unit has no power but has melody
the display circuit board is loosened.
