User manual ROLAND TR-808 SERVICE MANUAL

[. . . ] This will help prevent malfunctions and/or damage to speakers or other devices. Placement · Using the unit near power amplifiers (or other equipment containing large power transformers) may induce hum. To alleviate the problem, change the orientation of this unit; or move it farther away from the source of interference. · Do not expose the unit to direct sunlight, place it near devices that radiate heat, leave it inside an enclosed vehicle, or otherwise subject it to temperature extremes. Excessive heat can deform or discolor the unit. 4 Maintenance · For everyday cleaning wipe the unit with a soft, dry cloth or one that has been slightly dampened with water. [. . . ] If this indicator goes dim or no longer lights while an effect is ON, the battery is near exhaustion and should be replaced immediately. 5. Thumbscrew This thumbscrew is loosened to open the pedal, allowing battery replacement. For instructions on how to replace the battery, please refer to "CHANGING THE BATTERY (p. 12). " 6. INPUT Jack This jack accepts input signals (coming from a guitar, some other musical instrument, or another effects unit). * The INPUT jack also serves as the power switch. Power is turned on whenever a plug is inserted into the INPUT jack, and is turned off when the plug is disconnected. When not using the unit, you should disconnect any cord connected to the INPUT jack. 3. OUTPUT Jack The output jack is used to connect the unit to an amplifier or another device. 4. Pedal Switch This switch turns the effects ON/OFF. 7 RATE Knob DEPTH Knob RATE Knob This adjusts the rate of the tremolo. The further you move the knob clockwise, the faster the rate becomes. CHECK DEPTH Knob WAVE RATE DEPTH This adjusts the depth of the tremolo. When it is turned fully counterclockwise, no tremolo effect will be created. WAVE Knob WAVE Knob This controls the waveform of the tremolo. You can go from smooth volume changes to more dramatic ones. 8 MAKING THE CONNECTIONS AC Adaptor BOSS PSA-series (option) OUT 9V DC/200mA Electric Guitar Guitar Amplifier 9 * Inserting a plug into the INPUT Jack will automatically switch the unit on. * Be sure to carefully observe the battery's polarity (+ versus -). Slip the coil spring onto the spring base on the back of the pedal, then close the pedal. * Carefully avoid getting the snap cord caught in the coil spring. Finally, insert the thumbscrew into the guide bush hole and fasten it securely. 2 3 Coil Spring Battery Snap Cord Guide Bush Hole Battery Snap Battery Housing 9V Battery 4 5 12 SETTING EXAMPLES Vintage Tremolo CHECK Electric Piano sound CHECK WAVE WAVE RATE DEPTH RATE DEPTH Switching technique sound CHECK Rotary Speaker sound CHECK WAVE WAVE RATE DEPTH RATE DEPTH 13 SPECIFICATIONS TR-808: Tremolo Nominal Input Level . . . . . . . . 90 to 900 ms Residual Noise Level . . . . . . . . -90 dBu (IHF-A Weighted, Typ. ) Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . Pedal Switch, RATE Knob, DEPTH Knob, WAVE Knob Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . CHECK Indicator (Serves also as battery check indicator) Connectors . . . . . . . . . . . . . . . . . . . . . . INPUT Jack, OUTPUT Jack, AC Adaptor Jack (DC 9 V) Power Supply . . . . . . . . . . . . . . . . . . . DC 9 V: Dry Battery (6F22/ 9 V) AC Adaptor (PSA Series: Optional) Current Draw . . . . . . . . . . . . . . . . . . . 20 mA (DC 9 V) * Expected battery life under continuous use: Carbon: 10 hours These figures will vary depending on the actual conditions of use. 14 Dimensions . . . . . . . . . . . . . . . . . . . . . . [. . . ] Other AC adaptors may use a different polarity, or be designed for a different voltage, so their use could result in damage, malfunction, or electric shock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . · Avoid damaging the power cord. Do not bend it excessively, step on it, place heavy objects on it, etc. A damaged cord can easily become a shock or fire hazard. Never use a power cord after it has been damaged. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . · This unit, either alone or in combination with an amplifier and headphones or speakers, may be capable of producing sound levels that could cause permanent hearing loss. [. . . ]