PART IV
TROUBLESHOOTING - CHECK LIGHT FLASHING
E-34
ENGLISH
Check power supply transformer
The CHECK indicator light on the control panel is flashing but the green and red light
on the power supply does not illuminate or flash go to investigate the power supply
transformer.
1. Put the unit on the repair table.
2. Open the bottom plate by removing 4 screws with cross screwdriver. The green and
red light on the power supply does not illuminate.
4. Set the ohmmeter at the Volt ac range of 200V ac. Check the voltage at transformer
green plug on the power supply, it should read somewhere close to 18V ac. If yes, the
power supply has problem. If not, you will go to check the main circuit board.
5. Check the voltage on the transformer connection on the main circuit board. It should
read somewhere close to 110V ac. If yes, the transformer or the transformer power
cord has problem. You need to replace the transformer.
Check main circuit board
When you cannot check out the voltage on the power supply transformer connection of the main circuit board (see above
picture) and the CHECK indicator light on the control panel flashes you need to replace the main circuit board.
1. Set the ohmmeter at 200V ac.
2. Check power voltage on the
power supply cord plug. It
should read somewhere close to
18V ac.
3. Check voltage on power supply
connection of the main circuit board.
It should read somewhere close to
ac.
Check power supply
transformer
Step 3
Check main circuit board
Step 4
The green and red light on the
power supply do not illuminate.
To replace power supply
transformer see IMPORTANT
PART-POWER SUPPLY AND
TRANSFORMER on page 26.
Helpful hints
If the green or red lights on the power supply
illuminates or flashes the transformer is OK you
need not check or replace the power supply
transformer.
To replace main circuit board
see IMPORTANT PART-MAIN
CIRCUIT BOARD on page 19.
