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Manafacture: Boss Audio Systems File size: 859.59 kb File name: OC-20G_OM.pdf Language of manual:

Using an AC adapter makes possible long performances with no worry about batteries going dead. GK IN Connector This connector is for connecting your guitar with a GK cable. NORMAL PU MIX Switch When Master is on, this switch determines whether or not the normal pickup sounds (or the sounds input to the GUITAR RETURN) are mixed. By mixing the normal pickup sound, you can create a sound that makes your guitar sound come alive. GUITAR OUT Jack Normal pickup signals input through the GK-2A are output. When a cable is connected to this jack, the output of the normal pickup from the OUTPUT jack stops. Application Examples Using in Combination with Other Effect Devices OUTPUT INPUT Guitar with GK-2A or other GK-compatible guitar AC Adaptor PSA-series (sold separately) External Effector Guitar Amp Application Examples Using in Combination with Another GK EFFECT (WP-20G) OC-20G US-20 GK IN WP-20G AC Adaptor PSA-series AC Adaptor PSA-series Guitar Amp Guitar with GK-2A or other GK-compatible guitar (sold separately) (sold separately) 13 Application Examples Using in Combination with the GR-33 fig.12 US-20 GR-33 Power Amp + Speaker guitar amp simulator: ON GK GK IN MIX OUT RETURN Guitar with GK-2A or other GK-compatible guitar AC Adaptor PSA-series (sold separately) Troubleshooting The power doesn’t come on. . Is the external device connected correctly to the OUTPUT jack? . Check the connections again. * When running off batteries, the unit won’t switch on unless there’s something plugged into the OUTPUT jack. This helps conserve the batteries. . Have the batteries run down? . Replace with fresh batteries (p. 2). . Is the specified AC adaptor (PSA-series sold separately) connected correctly? . Check the connections again (p. 3, 4). There is no sound/volume is too low. . Is the other equipment connected correctly? . Check the connections again (p. 3, 4). . Is the volume turned down on the connected guitar amp, effects processor, or other device? . Check the settings on the connected equipment (p. 3, 4). . Is the GK-2A correctly installed and connected? . After reading the instructions in the GK-2A Owner’s Manual, check the installation once more. Also, confirm that the guitar and the GK-2A have been connected properly, using the supplied cable. . Is the GK-2A’s SYNTH VOL turned down? . Check to make sure the GK-2A’s SYNTH VOL is not lowered. . Is the GK-2A’s selection switch set to “MIX?” . When set to “GUITAR” or “SYNTH,” the necessary signals may not be input to the unit, which may prevent sounds from being produced. Troubleshooting No effects are being applied. . Is the GK-2A’s selection switch set to “MIX?” . When set to “GUITAR” or “SYNTH,” the necessary signals may not be input to the unit, which may prevent effects from being applied. . No effects are applied to sounds input to GUITAR RETURN and normal pickup sounds. Noise is produced. . Is the external device connected to the GUITAR RETURN jack working properly? . When the GUITAR RETURN jack is used, the signals input to this jack are used instead of the normal pickup sound. Therefore, noise may be produced when you’ve failed to switch on the external device’s power, or you haven’t hooked it up properly. . Is the GK cable securely connected? . When connecting the GK cable, insert the connector completely, until it is locked. 16 Sample Settings Warm Octave Sound fig.13 Acoustic Sound (String 5, 6: Bass) fig.14 Heavy Distortion Sound fig.15 Specifications OC-20G: GK EFFECT Controls Master On/Off Pedal Distortion On/Off Pedal TYPE Knob STRING SELECT Knob OCTAVE LEVEL Knob GK LEVEL Knob DISTORTION Knob TONE Knob LEVEL Knob NORMAL PU MIX Switch Indicator POWER Indicator (serves also as battery check indicator) MASTER ON/OFF Indicator DISTORTION ON/OFF Indicator Connectors GUITAR OUT Jack GUITAR RETURN Jack GK IN Connector OUTOUT Jack DC IN Jack (DC 9 V) Nominal Input Level -20 dBu Input Impedance 1 M. Nominal Output Level -20 dBu Output Impedance OUTPUT : 1 k. GUITAR OUT : 100 . Recommended Load Impedance 10 k. or greater Residual Noise Level -96 dBu (GK IN: terminated, Effects: OFF, Normal PU Mix: OFF, IHF-A, typ.) Power Supply DC 9 V: Dry Battery x 6, AC Adaptor Current Draw 150 mA (9 V, with GK-2A) * Expected battery life under continuous use: Carbon : 2 hours Alkaline : 6 hours These figures will vary depending on the actual conditions of use. Dimensions 173 (W) x 158 (D) x 57 (H) mm 6-13/16 (W) x 6-1/4 (D) x 2-1/4 (H) inches Weight 1.1 kg / 2 lbs 7 oz (including batteries) Accessories Dry Battery (LR6 (AA) type) x 6 Owner’s Manual Roland Service (Information sheet) Options AC Adaptor : PSA series Divided Pickup: GK-2A (Roland) Unit Selector : US-20 (Roland) GK Connecting Cable: C-13B (10 m: Roland) * 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. Used for instructions intended to alert the user to the risk of death or severe injury should the unit be used i...

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