Roland BOSS Flanger BF-3 (T) Operating and maintenance manual

SERVICE NOTES
Issued by RJA
Copyright © 2011 Roland Corporation
All rights reserved. No part of this publication may be reproduced in any form without the written permission
of Roland Corporation.
CC-KWS17058043E1
Jun. 2011 BF-3(T)
Table of Contents
Identifying the BF-3(T) .....................................................2
Cautionary Notes ..............................................................2
Specifications .....................................................................3
Location of Controls .........................................................4
Exploded View ..................................................................5
Disassembly Procedure ....................................................6
Conversion to the BF-3A ..................................................6
Parts List .............................................................................7
Verifying the Version........................................................9
Data Backup and Restore Operations ............................9
Performing a Factory Reset..............................................9
Updating the System ........................................................9
Test Mode ...........................................................................9
Circuit Board (Main, VR, LED, SW, Output B
Board)................................................................................12
Circuit Diagram (Main, VR, LED, SW, Output B
Board)................................................................................14

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 (Owner’s 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

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 kΩor 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
Owner’s 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.

4
Jun. 2011 BF-3(T)
Location of Controls
fig.panel.eps
16
17
18
No. Part Code Part Name Description Q’ty
1 5100014487 COMPACT PSA LABEL (22537538R0) 1
2 5100021036 PANEL 1
3 5100021031 CASE 1
4 22480220 P R-KNOB (INTERNAL) (SS) BF BLK/LCG 1
22480221 P O-KNOB (EXTERNAL) (OUTER) S BLK/LCG 1
5100018911 ROTARY POT(F3229220R0) RD912DF-20-20FWH-B50K-60009A2 1
40128923 HEX NUT M7 1
5 5100001341 6.5MM JACK HTJ-064-12DMP (13449150R1) 1
5100003926 PLAIN WASHER 9X13.5X0.5T NI(H5039158R0) 1
5100008086 INT TOOTH WASHER 9.5X12.5X0.5 NI RTC(H5039205R0) 1
5100003918 JACK NUT M9X12X2 NI RTC(H5039510R0) 1
5100015893 PLAIN WASHER 9.2X14X1.6 NI (H5039104R0) 1
5100015900 PLAIN WASHER 9.6X14XW11X1.0 AL (22137709R0) 1
6 13449105R0 6.5MM JACK HTJ-064-14I 1
5100003926 PLAIN WASHER 9X13.5X0.5T NI(H5039158R0) 1
5100008086 INT TOOTH WASHER 9.5X12.5X0.5 NI RTC(H5039205R0) 1
5100003918 JACK NUT M9X12X2 NI RTC(H5039510R0) 1
7 5100008294 PEDAL PLATE (22357304R0) 1
8 5100006632 BOTTOM COVER (22027851R0) 1
9 5100006633 BOTTOM FOOT (22357305R0) 1
10 5100006631 CAUTION SEAL PSA (FCC/EMI)(G2537516R2) 1
11 5100007512 THUMB SCREW (H5029820R0) 1
12 F3439875R0 ADAPTOR JACK KM02018ABM1P 1
13 F5029423R0 LED L-3VEGW 1
5100002339 LED SPACER 304 1
14 04567601 P R-KNOB MF BLK/LCG(22480260R0) 1
5100014193 R.POTENTIOMETER (F3279853R0) RD901F-20-15FB-B50K-04 1
40128923 HEX NUT M7 1
15 04567601 P R-KNOB MF BLK/LCG(22480260R0) 2
F3279852R0 POTENTIOMETER RD901-20-15FW-B54-006 2
40128923 HEX NUT M7 2
16 5100020609 6.5MM JACK SCJ614M2NCS3B11G 1
5100003926 PLAIN WASHER 9X13.5X0.5T NI(H5039158R0) 1
5100008086 INT TOOTH WASHER 9.5X12.5X0.5 NI RTC(H5039205R0) 1
5100003918 JACK NUT M9X12X2 NI RTC(H5039510R0) 1
17 5100006457 6.5MM JACK HTJ-064-14D(13449140R0) 1
5100003926 PLAIN WASHER 9X13.5X0.5T NI(H5039158R0) 1
5100008086 INT TOOTH WASHER 9.5X12.5X0.5 NI RTC(H5039205R0) 1
5100003918 JACK NUT M9X12X2 NI RTC(H5039510R0) 1
18 5100021035 PEDAL 1

5
Jun. 2011 BF-3(T)
Exploded View
fig.bunkaizu.eps
1
2
3
45
6
7
8
9
10
a
b
c
d
No. Part Code Part Name Description Q’ty
1 13129710R0 SWITCH(PUSH) JM-0404 1
2 5100007503 BATTERY CUSHION (22267333R0) 1
3 5100007872 BATTERY CONNECTOR 006P BATTERY SNAP (F3419102R0) 1
4 5100006631 CAUTION SEAL PSA (FCC/EMI)(G2537516R2) 1
5 5100006633 BOTTOM FOOT (22357305R0) 1
6 5100006632 BOTTOM COVER (22027851R0) 1
7 5100022073 INSULATING SHEET 1
8 5100007505 PEDAL GUIDE BUSH (22157702R0) 1
9 5100007504 COIL SPRING (22177109R0) 1
10 5100008294 PEDAL PLATE (22357304R0) 1
a 5100008092 PLAIN WASHER 3X6X0.5 RESIN RTC(H5039708R0) 2
b 40010267 SCREW M3X10 BINDING MACHINE FE BZC 2
c 5100007965 SCREW 3X6(H5029325R0) PAN TAPPING B1 BZC 4
d 5100007512 THUMB SCREW (H5029820R0) 1

6
Jun. 2011 BF-3(T)
Disassembly Procedure
1. Remove No. 6 Bottom Cover, and No. 7 Insulating Sheet.
2. Lift the Main Sheet Assy.
3. Remove the VR Board (1), and then the OUTPUT B jack (2).
fig.bunkai.eps
Conversion to the BF-3A
When converting from the BF-3 (older type) to the BF-3A (new type), replace the components shown in the following chart.
fig.insulating-sheet.eps
5100023214 INSULATING SHEET 36X14X0.5
BF-3 BF-3A
Part Code Part Name Description Part Code Part Name Description
75D6439001 MAIN BOARD ASSY
->
5100020562 MAIN SHEET ASSY
******** MAIN BOARD ******** MAIN BOARD
******** VR BOARD ******** VR BOARD
******** LED BOARD ******** LED BOARD
******** SW BOARD ******** SW BOARD
75D643O000 OUT JACK ASSY ******** OUTPUT B BOARD
G2167301 INSULATION SPACER -> 5100022073 INSULATING SHEET (for insulating the bottom)
******** INSULATING SHEET -> 5100023214 INSULATING SHEET 36X14X0.5 (for insulating OUTPUT B)
G6017304 OWNER’S MANUAL JAPANESE -> 5100021062 OWNER’S MANUAL JAPANESE
G6017305 OWNER’S MANUAL ENGLISH -> 5100021063 OWNER’S MANUAL ENGLISH
1
2

7
Jun. 2011 BF-3(T)
Parts List
fig.-part1-e.eps
Safety Precautions:
The parts marked have
safety-related characteristics. Use
only listed parts for replacement.
Note: The parts marked # are new. (initial parts) The description “Q’ty” means a necessary number of the parts per one product.
Due to one or more of the following reasons,
parts with parts code ******** cannot be supplied as service parts.
• Part supplied only as a component in a complete assembly
• Copyright does not permit the part to be supplied
• Part is sold commercially
CASING
5100021031 CASE 1
5100021036 PANEL 1
5100021035 PEDAL 1
5100006632 BOTTOM COVER (22027851R0) 1
CHASSIS
5100008294 PEDAL PLATE (22357304R0) 1
KNOB, BUTTON
04567601 P R-KNOB MF BLK/LCG(22480260R0) 3
22480220 P R-KNOB (INTERNAL) (SS) BF BLK/LCG 1
22480221 P O-KNOB (EXTERNAL) (OUTER) S BLK/LCG 1
SWITCH
13129710R0 SWITCH(PUSH) JM-0404(13129710R0) SW500 (SW Board) 1
JACK, EXT TERMINAL
# 5100020609 6.5MM JACK SCJ614M2NCS3B11G JK500 (Guitar In) 1
5100006457 6.5MM JACK HTJ-064-14D(13449140R0) JK501 (Bass In) 1
5100001341 6.5MM JACK HTJ-064-12DMP (13449150R1) JK502 (OUTPUT B) 1
13449105R0 6.5MM JACK HTJ-064-14I JK503 (OUTPUT A) 1
F3439875R0 ADAPTOR JACK KM02018ABM1P 1
PWB ASSY
# 5100020562 MAIN SHEET ASSY 1
* This unit includes the following parts.
******** MAIN BOARD 1
******** VR BOARD 1
******** LED BOARD 1
******** SW BOARD 1
******** OUTPUT B BOARD 1
DIODE
F5029423R0 LED L-3VEGW LED500 on LED Board 1
POTENTIOMETER
5100018911 ROTARY POT(F3229220R0) RD912DF-20-20FWH-B50K-60009A2 VR500 (RES, MANUAL) 1
5100014193 R.POTENTIOMETER (F3279853R0) RD901F-20-15FB-B50K-04 VR503 (MODE) 1
F3279852R0 POTENTIOMETER RD901-20-15FW-B54-006 VR501, VR502 (DEPTH, RATE) 2
WIRING, CABLE
5100021030 WIRING W2(3PIN) 1
5100021029 WIRING W1(7PIN) 1
SCREWS
40010267 SCREW M3X10 BINDING MACHINE FE BZC 2
5100007965 SCREW 3X6(H5029325R0) PAN TAPPING B1 BZC 5
5100007512 THUMB SCREW (H5029820R0) 1
40128923 HEX NUT M7 4
5100003918 JACK NUT M9X12X2 NI RTC(H5039510R0) 4
5100008086 INT TOOTH WASHER 9.5X12.5X0.5 NI RTC(H5039205R0) 4
5100008092 PLAIN WASHER 3X6X0.5 RESIN RTC(H5039708R0) 2
5100003926 PLAIN WASHER 9X13.5X0.5T NI(H5039158R0) 4
5100015893 PLAIN WASHER 9.2X14X1.6 NI (H5039104R0) 1
5100015900 PLAIN WASHER 9.6X14XW11X1.0 AL (22137709R0) 1

8
Jun. 2011 BF-3(T)
MISCELLANEOUS
5100007872 BATTERY CONNECTOR 006P BATTERY SNAP (F3419102R0 1
5100007503 BATTERY CUSHION (22267333R0) 1
5100006633 BOTTOM FOOT (22357305R0) 1
5100006631 CAUTION SEAL PSA (FCC/EMI)(G2537516R2) 1
5100007504 COIL SPRING (22177109R0) 1
5100014487 COMPACT PSA LABEL (22537538R0) 1
# 5100020413 EARTH TERMINAL 2
# 5100023214 INSULATING SHEET 36X14X0.5 1
5100022073 INSULATING SHEET 1
5100007870 INSULOCK TIE YJ-80 V2 (H5319102R0) 2
5100002339 LED SPACER 304 1
5100007505 PEDAL GUIDE BUSH (22157702R0) 1
ACCESSORIES (Standard)
# 5100021062 OWNER’S MANUAL JAPANESE 1
# 5100021063 OWNER’S MANUAL ENGLISH 1

9
Jun. 2011 BF-3(T)
Verifying the Version
1. Turn down all controls completely counterclockwise (to MIN or
MOMENTARY).
2. Hold down the pedal and connect the AC adaptor to the DC IN jack.
The CHECK LED lights up and the unit enters the Test Mode.
After approximately 2 seconds, the CHECK LED lights up or flashes,
indicating the version as shown below.
Examples: Illuminated orange: Version 1.00
2 flashes: Version 2.00
* Version 1.00 is the BF-3 (older type), and version 2.00 is the BF-3A (new type).
After the version information is displayed, execution changes to 1. DSP
and CPU Check.
3. Release the pedal.
Data Backup and Restore
Operations
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 (Owner’s Manual, p. 14).
No user data other than the setting for the sleep mode is saved.
Performing a Factory Reset
This product has no factory-reset feature.
Updating the System
A system update cannot be performed for this product. If an update is
required, replace with an updated circuit board. Updates can be accomplished
only at the factory.
Test Mode
Items Required
• AC adaptor (PSA-series device)
• Amp-equipped monitor speaker x 1
• Signal generator x 1
• Oscilloscope x 1
• Noise meter x 1
• Stabilized power supply x 1
• 47-kΩdummy plug x 1
Test Items
1. DSP and CPU Check (p. 10)
2. Volume Check (p. 10)
3. CODEC (DAC) Check (p. 10)
4. CODEC (ADC) L-channel Check (p. 11)
5. CODEC (ADC) R-channel Check (p. 11)
6. Battery Operation Check (p. 11)
7. Noise Check (p. 11)
*6. Battery Operation Check is carried out in the normal mode, and not in the
Test Mode. 7. Noise Check is carried out in its own mode.
Entering the Test Mode
1. Turn down all controls completely counterclockwise (to MIN or
MOMENTARY).
2. Hold down the pedal and connect the AC adaptor to the DC IN jack.
The CHECK LED lights up and the unit enters the Test Mode.
3. Release the pedal.
* The unit cannot enter the Test Mode unless all controls are turned down to
minimum. If the minimum value is not detected for all volume controls due to a
problem such as a defective volume control, the Test Mode cannot be entered.
Quitting the Test Mode
Depress the pedal.
* If an error occurred in 1. DSP and CPU Check, depressing the pedal does not
quit the mode. In such cases, disconnect the AC adaptor to switch off the power.
* At 5. CODEC (ADC) R-channel Check, depressing the pedal does not quit
the mode. In this case, either adjust the MODE control to any setting other than
ULTRA and depress the pedal, or disconnect the AC adaptor to switch off the
power.
Selecting a Test Item
1. Enter the Test Mode.
2. After the version information is displayed, 1. DSP and CPU Check is
carried out automatically, and if no error occurs, the CHECK LED lights
up green.
3. Use the MODE control to select the desired test item.
MOMENTARY: 2. Volume Check
GATE/PAN: 3. CODEC (DAC) Check
STANDARD: 4. CODEC (ADC) L-channel Check
ULTRA: 5. CODEC (ADC) R-channel Check

10
Jun. 2011 BF-3(T)
1. DSP and CPU Check
The DSP and CPU check is carried out automatically. The CHECK LED
lights up green if no problem occurs and flashes red in the event of a
defect.
* If the LED flashes red, operation stops and execution cannot advance to the next
test item. Possible causes include a fault in the peripheral circuitry for the DSP
or CPU, or a soldering defect. Detach the AC adaptor to switch off the power to
the unit.
If the CHECK LED lights up green, follow the procedure below to carry
out a DSP throughput check.
1. Connect the oscilloscope to the OUTPUT A and Bjacks.
2. Connect the signal generator to the GUITAR IN jack and input a signal
like the following.
200-Hz rectangular wave at 1 Vp-p
3. Verify that a signal like the following (the same as the input signal) is
output from OUTPUT A and B.
200-Hz rectangular wave at 1 Vp-p
fig.001.eps
500 mV/div. and 1 ms/div
2. Volume Check
Verify that the MODE control is set to MOMENTARY.
* The volume check can be executed only in this sequence: RES -> MANUAL ->
DEPTH -> RATE -> MODE.
RES Volume Check
Slowly turn the RES control from MIN to center, and then to MAX, and
verify that the CHECK LED changes in this sequence: green -> orange ->
green -> orange -> green.
MANUAL Volume Check
Slowly turn the MANUAL control from MIN to center, and then to MAX,
and verify that the CHECK LED changes in this sequence: green ->
orange -> green -> orange -> green.
DEPTH Volume Check
Slowly turn the DEPTH control from MIN to center, and then to MAX,
and verify that the CHECK LED changes in this sequence: green ->
orange -> green -> orange -> green.
RATE Volume Check
Slowly turn the RATE control from MIN to center, and then to MAX, and
verify that the CHECK LED changes in this sequence: green -> orange ->
green -> orange -> green.
MODE Volume Check
Turn the MODE control clockwise by one click at a time, and verify that
the CHECK LED changes in this sequence: green (MOMENTARY) ->
orange (GATE/PAN) -> red (STANDARD) -> green (ULTRA).
3. CODEC (DAC) Check
1. Set the MODE control to GATE/PAN.
2. Verify that the CHECK LED is lighted up orange.
3. Connect the oscilloscope to the OUTPUT A and Bjacks.
4. Connect a plug to the GUITAR IN jack.
* A waveform is output even when no signal is input.
5. Verify that a signal like the following is output from OUTPUT A and B.
200-Hz rectangular wave at 1 Vp-p
fig.002.eps
500 mV/div. and 1 ms/div.
6. Disconnect the plug from the GUITAR IN jack and connect it to the BASS
IN jack.
7. Verify that a signal like the following is output from OUTPUT A and B.
400-Hz rectangular wave at 1 Vp-p
fig.003.eps
500 mV/div. and 1 ms/div.
8. Disconnect the plug from the OUTPUT B jack.
9. Verify that a signal like the following (delta wave) is output from
OUTPUT A.
fig.004.eps
500 mV/div. and 1 ms/div.