The HPD-20 contains an Auto-Off feature which shuts down the power automatically after 4 hours has elapsed since it was last played or operated. This feature can be disabled if desired.
Here's how.
1. Press MENU.
2. Press the cursor right arrow (>) button to highlight the "SYS" icon, and then press ENTER.
3. Press cursor down to highlight "Options," and then press ENTER.
4. Cursor down to select "Auto Off."
5. Press the ( - ) button to choose "OFF."
6. Press KIT to return to the main menu. The new settings are saved automatically.