Roland Boss RC-20XL Service Notes page 18

Sep.2004
Always check the battery after repairing or servicing
the product.
Skipping directly to the desired test
• Enter Test mode.
• The FLASH ROM check will occur automatically, and if there is no
problem, all LEDs other than "PEAK" will light.
• Follow the procedure described in the section for the test you want to
perform.
In order to perform "5. GUIDE volume check," you must
first perform "4. LEVEL volume check."
Exiting Test mode
• Disconnect the plug from the ADAPTOR jack to turn off the power.
Cautions
After repairing or servicing the product, you must check all test items.
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