What to do if refrigerators are causing interference with my Optimus CONCERTMATE 690 42-4035?
If your Optimus Electronic Keyboard is experiencing interference, especially with appliances like refrigerators or washing machines, try using an AC outlet on a different electrical circuit, located away from the interfering appliance.
How to troubleshoot power supply issues with my Optimus CONCERTMATE 690 42-4035 Electronic Keyboard?
If your Optimus Electronic Keyboard has a power supply problem, make sure the adapter is properly connected. Also, check if the batteries are installed correctly and are fresh.
Why does my Optimus Electronic Keyboard not play chords when in FINGERED mode?
When the MODE is set to FINGERED on your Optimus Electronic Keyboard, ensure that you press at least three keys for a chord.
General| Brand | Optimus |
|---|---|
| Model | CONCERTMATE 690 42-4035 |
| Category | Electronic Keyboard |
| Language | English |
Select from 100 unique instrument or sound effect voices.
Provides a steady beat for various music styles.
Instructions for powering the keyboard using batteries or adapters.
Step-by-step guide to turning on and operating the keyboard.
Steps to choose and play one of the 100 preset instrument sounds.
Guide to choosing and activating preset rhythmic patterns.
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