Troubleshooting
7-5
There are three diagnostic groups that may be used as follows:
1. SCAN – This single diagnostic displays the action of every control.
2. LCD – This diagnostic tests the memory of the display module.
3. ENGINE – These diagnostics test various parts of the internal sound board.
To proceed to a diagnostic group, press the associated soft button.
Scan Diagnostic
When the Scan Diagnostic is selected, the initial screen will be like this;
At this point, any key press, button press, or control movement will display what moved and
what its value is. Response to each of the controls is described below.
Keys
When a key is pressed very slowly halfway down, the display will first change to:
“POS:25” means that key number 25 (Middle C, C4) was pressed. The key numbers range
from 1 (C2) to 61 (C6). “1ST” and “2ND” show the status of the key’s two switches, 0=Off and
1=On. Since the key is halfway down, only the first switch is on. After pressing the
remaining distance, the second switch turns on and the display changes to:
Now both key switches are on. After the key is down, pressing harder will activate the
aftertouch (pressure) sensor and the “PSR” value will increase:
Firm pressure should be required to get the reading up to 126 or 127. If it is too difficult or
too easy to reach values near 127, a service center may need to adjust the pressure sensitivity.
Finally, when the key is released, the two key switches turn off in the opposite order they
turned on: 2ND first then 1ST and displayed as follows:
Properly functioning keys will go through the sequence just described. If one of the
switches doesn’t turn on or the 0/1 indication flickers, it means that the keyswitches need
cleaning by a service center.
KEYBRD POS:25
1ST:0 2ND:0 PRS:0
KEYBRD POS:25
1ST:1 2ND:1 PRS:78
KEYBRD POS:25
1ST:1 2ND:1 PRS:0
KEYBRD POS:25
1ST:1 2ND:0 PRS:0
SCAN DIAG
PRESS ANY KEY
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