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PCB MAIN
TEST MODE Wave ROM check MAIN: IC12, IC18
Procedure
1. Press and hold the two E keys shown below, and then turn on the power switch. 2. Select the POP GROUND sound. 3. Reduce the MAIN VOLUME level low enough.
When set to the self-diagnostic mode, the Wave ROM outputs a sine wa The Wave ROMs correspond to the keyboard keys as shown in the diagram to the right. When a key is pressed, the corresponding sine wa sound is produced. If no sound is produced, or if the sound is distorted the Wave ROM corresponding to that key is defective. This method allo to diagnose also the output routes (L/R) from the Wave ROM. -The key number indicates the Wave ROM number.
(I-1: IC12, I-2: IC18)
CPL CPR
Control Panel buttons Press and hold the two F keys shown below, and then turn on the powe LED lighting check switch.
Control Panel LED display check
Press the buttons on the control and confirm that the corresponding LE light. Press and hold the two G keys shown below, and then turn on the powe switch.
MKB
Keyboard ROM (IC1) check
The numbers are displayed automatically and repeatedly on the display Press and hold the two A keys shown below, and then turn on the powe switch.
If the keyboard ROM (IC1) is OK, only the TOUCH SENSITIVITY LIGHT L flashes. If it is defective, the LEDs (LIGHT and NORMAL, or LIGHT, NORMAL and HEAVY) flash.
9. PRECAUTIONS BEFORE SERVICING
9.1. Precautions for measuring of the output waveforms 1. The waveform was measured with a �National Digital Storage
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