Yamaha PSR-F50 Service Manual - Page 16

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Yamaha PSR-F50 Service Manual
PSR-F50
■ DM Circuit Board Test Method
The DM Circuit Board is provided with test points for service check purposes.
Check the test points on the DM Circuit Board if the following symptoms appear.
Symptoms and check items
No LED display with Power SW ON -- > Check items 1 to 5 sequentially
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