Riken Keiki GD-3EC, Техническое руководство

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7. Maintenance 7-3 Performing tests (test mode)
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7-3-5 Performing memory test (RAM test)
Perform a memory 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 [2-0.4], then press the SET
key.
3 Press the SET key.
The memory test starts.
3 Check the memory test result.
No problems with memory:
[PASS] appears.
Problems with RAM:
[F-rA] appears.
Problems with ROM:
[F-rO] appears.
Problems with both RAM and ROM:
[F-rA] and [F-rO] are displayed alternately.
4 Once you have checked the result, press the SET key.
Returns to the [2-0.4] display.