BOSS BF 3A SERVICE NOTES
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2 Jun. 2011 BF-3(T) Identifying the BF-3(T) The BF-3(T) exists in two types that have different circuit structures. In this Service Notes, the older type is called the BF-3, and the newer type is called the BF-3A. Both have Flanger BF-3 inscribed on the pedal and appear at a glance to be completely identical, but they can be distinguished as indicated in the following table. After identifying the type of the product being serviced, refer to the corresponding Service Notes for information on required parts and test methods. BF-3: SERVICE NOTES (#17058043E0) BF-3A: SERVICE NOTES 2ND EDITION (#17058043E1) This version of Service Notes is for the BF-3A. Cautionary Notes Before beginning the procedure, please read through this document. The matters described may differ according to the model. User Data Cannot Be Backed Up The setting for the sleep mode is saved on the Main Board even when the power has been switched off, but neither verification of its status (ON or OFF) nor backing up the setting is possible. When the Main Board has been replaced, the sleep mode is returned to its default (ON). For more information about the sleep mode, refer to About Sleep Mode (Owners Manual, p. 14). No user data other than the setting for the sleep mode is saved. Part Replacement When replacing components near the power-supply circuit or a heat- generating circuit (such as a circuit provided with a heat sink or including a cement resistor), carry out the procedure according to the instructions with respect to the part number, direction, and attachment position (mounting so as to leave an air gap between the component and the circuit board, etc.). Parts List A component whose part code is ******** will not 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). - Because it is carried in electronic data on the Roland web site. - Because it is a package or an accessory irrelevant to the function maintenance of the main body. - Because it can be replaced with an article on the market. (battery or etc.) 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. BF-3 BF-3A Production number Up through H**8559 H**8560 and after Style of component mounting on the circuit board Single-side mounting Double-side mounting System version Version 1.00 Version 2.00 or later
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3 Jun. 2011 BF-3(T) Specifications BF-3: Flanger (BF-3A) 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 0.3 mS–14.4 mS (GUITAR IN) 0.3 mS–6.3 mS (BASS IN) LFO Speed 100 mS–18 S Residual Noise -95 dBu (IHF-A Typ.) Controls Pedal Switch MANUAL Knob RES (resonance) Knob DEPTH Knob RATE Knob MODE Knob Indicator CHECK Indicator (Serves also as tempo and battery check indicator) Connectors GUITAR IN Jack BASS IN Jack OUTPUT A (MONO) Jack OUTPUT B 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 40 mA (DC 9 V) * Expected battery life under continuous use: Carbon: 3 hours Alkaline: 10 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 435 g /1 lb (including Battery) Accessories Owners Manual (#5100021063) Leaflet (USING THE UNIT SAFELY, IMPORTANT NOTES, and Information) (#********) Dry battery/9 V type (6F22) (#********) * The battery that was supplied with the unit is for temporary use intended primarily for testing its operation. Options AC Adaptor PSA-series * 0 dBu = 0.775 Vrms * Printed matters will not be supplied after the end of the production. Then, download the electronic file from the Roland web site. * In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice.