Boss DD-7超级数码延迟效果器维修手册,本音响维修电路图为电子版，页数：24页------Connect an AC adaptor.
2. Turn down all controls all the way counterclockwise.3. Holding down the foot pedal and inserting a plug into the INPUT jackmakes the CHECK LED light up. Continue holding down the pedal until the LED goes dark.After approximately 2 seconds, the CHECK LED goes dark.* The CPU and DSP checks are performed before the LED goes dark as justdescribed. If a problem is found in the CPU, DSP, or the like, the LED may not
