1. Prior to trouble settlement, check if the power socket is electrified and the connecting power
supply spec. is normal.
2. Check if the power botton on display is pressed or not.
3. If other troubles are found, please refer to the remarks on the next page to make an
inspection.
Primary Inspection
Y
Y
Y
N
22
Y
N
N
N
Start
Is primary voltage of the
transformer ok ?
Is secondary voltage of
Transformer ok ?
Is display ok ?
Power on again
Normal
Check and repair the
wire assembly
replace the transformer
Repair or replace the
display
Replace the mainboard
subassembly
Test the 7812 output woltage
Test the 7805 output woltage
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