How do I perform diagnostics or a hard reset (factory defaults) on the various Kurzweil Mark series?

RG100 and MARK 2
The only way to "HARD RESET," this unit, is to run diagnostics. Turn unit off. Hold down the "FUNCTION" button. Turn the unit on, and hold the function button three (3) seconds. Only the "SELECT," AND "POWER" LED's should be lit. Press and release the "REVERB" button. Let the tests run for 5 minutes. Turn the unit off. The unit is now reset.

RG200 and Mark 3
The only way to "HARD RESET," this unit, is to run diagnostics. Turn unit off. Turn unit on. Press and release the "FUNCTION," button. Press and release the sixth E flat from the left. Just the "POWER," and "PLAY" LED's should be lit. Press and release the , "STAGE/ROOM," button. Let the tests run for 5 minutes. Turn the unit off. The unit is now reset.

MARK 5
Turn the unit off. Hold down the "TRANSPOSE," "MIDI," and, "DEMO" buttons. Turn unit on. Wait 5
seconds then release all buttons. Press and release the "CHORUS/ECHO/SYMPHONIC," button. Let the tests run for 5 minutes. Turn the unit off, the MARK 5 is now reset.

MARK 6
Turn the unit off. Hold down the , "KEY START," "PEDAL START," and, "METRONOME," buttons down.
Turn the unit on. Wait 5 seconds, then release all buttons. Press the, "CHORUS/ECHO/SYMPHONIC,"
button. Wait 5 minutes, turn the unit off. The MARK 6 is now reset.

MARK 8
Turn the unit off. Hold down the, "BROADWAY/CLASSICAL," and "16 BEAT-1/16 BEAT" and "FILL TO
ORIGINAL," buttons. Turn the unit on. Wait 5 seconds, then release all buttons. Press the,
"CHORUS/ECHO/SYMPHONIC," button. Wait 5 minutes, turn the unit off. The MARK 8 is now reset.

MARK 10/110/150
Turn the unit off. Hold down the, "SWING WALTZ," AND "START/STOP," buttons. Turn the unit on and
swiftly press and hold the "TRACK 1," button. Wait 5 seconds and release all three (3) buttons. The display should now read, "000". Press the up arrow button until the display reads, "003". Press and release the "VARIATION" button. After a few seconds, the "CHORD HOLD," LED should flash, indicating the test passed. Turn the unit off, the unit is now reset.

MARK 12/112/152
Turn the unit off. Hold down the "KEY START," "KEY STOP," AND "LAYER VOLUME," buttons. Wait 5
seconds then release all the buttons. Select, "RUN DIAGS." Press the UP arrow until the display reads, "RAM TEST." Press the "START/STOP," button to run the test. When the display reads, "SUCCESS." Turn the unit off, the unit is now reset.

*There is no hard reset or diagnostic available for the MARK 1.