Riken Keiki GD-3EC, Technical Manual

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7. Maintenance 7-3 Performing tests (test mode)
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7-3-4 Performing LED test
Perform an LED display test.
1 Press the ▲ or ▼ key in maintenance mode several times
to select [2-0], then press the SET key.
2 Press the ▲ or ▼ key to select [2-0.3], then press the SET
key.
3 Press the ▲ or ▼ key to select [on], then press the SET
key.
4 Check to confirm that all LEDs light up.
5 Once the LED test is complete, press the ▲ or ▼ key to
select [oFF], then press the SET key.
The LED test ends.
The LED test can also be ended by pressing the MENU/ESC key.