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PCB
TEST MODE
MAIN Wave ROM check
MAIN: IC106
Control Panel buttons
CPL
LED lighting check
CPR
LCD check
LCD
8. PRECAUTIONS BEFORE SERVICING
8.1. Precautions for measuring of the output waveforms
1. The waveform was measured with a "National Digital Storage
Oscilloscope VP-5730A". Therefore the waveforms of musical
tone signals shown may differ somewhat due to the difference in
the timing of triggering.
1. Press and hold the two E keys shown below, and then turn on the power switch.
2. Select the GROUND sound.(SINE WAVE TEST)
3. Reduce the MAIN VOLUME level low enough.
When set to the self-diagnostic mode, the Wave ROM outputs a sine
The Wave ROM correspond to the keyboard keys as shown in the
When a key is pressed, the corresponding sine wave sound is produced.If
no sound is produced, or if the sound is distorted, the Wave ROM
corresponding to that key is defective.
Select UPRIGHT sound.(OUTSEL TEST)
This method allows to diagnose also the output routes (L/R) from
Wave ROM.
-
Select ELECTRIC / MODERN / MALLET & ORCH PERC sound.
You can test HIGH / LOW / 10dB down sound.
Press and hold the two F keys shown below, and then turn on the
switch.
Press the buttons on the control and confirm that the corresponding
light.
Press and hold the two G keys shown below, and then turn on the
switch.
When set to the self-diagnostic mode, the test pattern is shown on
display. Monitor the display to confirm that the characters appear
Procedure
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