BOSS DD 7 SERVICE NOTES
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2 May. 2008 DD-7 Cautionary Notes Before beginning the procedure, please read through this document. The matters described may differ according to the model. No User Data This product cannot save user data. Backing up user data during servicing is not required. Parts List A component whose part code is ******** cannot be supplied as a service part because one of the following reasons applies. - Because it is supplied as an assembled part (under a different part code). - Because a number of circuit boards are grouped together and supplied as a single circuit board (under a different part code). - Because supply is prohibited due to copyright restrictions. - Because reissuance is restricted. - Because the part is made to order (at current market price). Circuit Diagram In the circuit diagram, NIU is an abbreviation for Not in Use, and UnPop is an abbreviation for Unpopulated. They both mean non-mounted components. The circuit board and circuit board diagram show silk-screened indications, but no components are mounted.
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3 May. 2008 DD-7 Main Specifications DD-7: Digital Delay Nominal Input Level -20 dBu Input Impedance 1 MΩ Nominal Output Level - 20 dBu Output Impedance 1 kΩ Recommended Load Impedance 10 kΩ or greater Delay Time 1 ms to 6400 ms * Values may vary according to the mode and connections. Maximum Recording Time 40 seconds (in HOLD mode) Controls Pedal switch E.LEVEL knob, F.BACK knob, D.TIME knob, MODE knob Indicator CHECK indicator (Used for indication of TEMPO, HOLD, and to check battery) Connectors INPUT-A (MONO) jack, INPUT-B jack OUTPUT-A (MONO) jack, OUTPUT-B jack TEMPO/EXP jack, AC adaptor jack (DC 9 V) Power Supply DC 9 V: Dry battery 6F22 (9 V) type (carbon) Dry battery 6LR61 (9 V) type (alkaline) AC Adaptor (PSA-series: optional) Current Draw 55 mA (DC 9 V) Expected battery life under continuous use: Carbon: 1.5 hours Alkaline: 6 hours * These figures will vary depending on the actual conditions of use. Dimensions 73 (W) x 129 (D) x 59 (H) mm 2-7/8 (W) x 5-1/8 (D) x 2-3/8 (H) inches Weight 440 g / 1 lb (including battery) Accessories Owners Manual English (#G2507366R0) Mode Sticker (#G2547154R0) Application Sticker (#G2547160R0) Leaflet (USING THE UNIT SAFELY, IMPORTANT NOTES, and Information) (#********) Dry battery/9 V type (6LR61) (#********) * The battery that was supplied with the unit is for temporary use-intended primarily for testing the units operation. We suggest replacing this with an alkaline dry cell. Options AC adaptor (PSA-series) * 0 dBu = 0.775 Vrms * In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice.