Technics SX-KN930

switch.
LCD Display check
switch.
[No. [PCB] TEST MODE
Wave ROM check Press and hold the two E keys shown below, and then turn on the power
MAIN: IC25 switch.
When set to the self-diagnostic mode, the Wave
ROM outputs a sine wave. The Wave ROMs
correspond to the keyboard keys as shown in the
diagram to the right. When a key is pressed, the
corresponding sine wave sound is produced. If no
sound is produced, or if the sound is distored, the
Wave ROM corresponding to that key is defective.
Press and hold the two F keys shown below, and then turn on the power
cP LED & SW check
All the LEDs turn off after lighting once. Confirm that all the LEDs light.
Press and hold the two G keys shown below, and then turn on the power
All dots of the LCD screen light for 10 seconds, after which different displays appear in succession.
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E keys
The key number indicates the Wave ROM number.
(1:1C25)
| KEY | C# D D#E F F# G A A# B
ae ERP EEE EE!
UTIL TAL LST
——
F keys
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G keys