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Boss AC-3 Service Notes

Acoustic simulator
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See also: Owner's Manual
Mar. 2006

Table of Contents

Cautionary Notes ..............................................................2
Specifications .....................................................................2
Location of Controls .........................................................3
Location of Controls Parts List........................................3
Exploded View ..................................................................4
Exploded View Parts List.................................................4
Copyright © 2006 ROLAND CORPORATION
All rights reserved. No part of this publication may be reproduced in any form without the written permission
of ROLAND CORPORATION.
Parts List .............................................................................5
Checking Version Number ..............................................8
Test Mode ...........................................................................8
Circuit Board....................................................................13
Circuit Diagram ...............................................................14
REVERB
LEVEL
LINE OUT
G.AMP OUT
INPUT
17058403E0
SERVICE NOTES
Issued by RJA
Printed in Japan (0500) (SC-KWS)
AC-3

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Summary of Contents for Boss AC-3

  • Page 1: Table Of Contents

    Mar. 2006 AC-3 SERVICE NOTES Issued by RJA Table of Contents Cautionary Notes ..............2 Parts List ................5 Specifications ..............2 Checking Version Number ..........8 Location of Controls ............3 Test Mode ................8 Location of Controls Parts List........3 Circuit Board..............13 Exploded View ..............4 Circuit Diagram ...............14...

  • Page 2: Cautionary Notes

    (under a different part code). components are mounted. • Because supply is prohibited due to copyright restrictions. Specifications AC-3: Acoustic Simulator Nominal Input Level Dimensions 20 dBu 73 (W) x 129 (D) x 59 (H) mm...

  • Page 3: Location Of Controls

    Mar. 2006 AC-3 Location of Controls fig.panel.eps 12 11 REVERB LEVEL LINE OUT G.AMP OUT INPUT Location of Controls Parts List Part Code Part Name Description Q’ty 22480220R0 P R-KNOB BF BLK/LCG (INTERNAL) 22480221R0 P R-KNOB S BLK/LCG (EXTERNAL) F3279854R0...

  • Page 4: Exploded View

    Mar. 2006 AC-3 Exploded View fig.exploded.eps Exploded View Parts List Part Code Part Name Description Q’ty 13129710R0 SWITCH (PUSH) JM-0404 22267333R0 CUSHION F3419102R0 BATTERY CONNECTOR 006P BATTERY SNAP G2537516R0 PSA CAUTION CE 9V N225 22357305R0 BOTTOM BASE 22027851R0 BOTTOM COVER...

  • Page 5: Parts List

    Mar. 2006 AC-3 Parts List fig.part1j Due to one or more of the following reasons, SAFETY PRECAUTIONS: parts with parts code ******** cannot be supplied as service parts. The parts marked have safety-related characteristics. Use only listed parts for replacement.
  • Page 6 Mar. 2006 AC-3 RESISTOR F5399918R0 12KF 1PCT (1608TYPE) F-RANK MTL.FILM RESISTOR F5429386R0 150KF 1PCT (1608TYPE) F- MTL.FILM RESISTOR RANK F5429366R0 15KF 1PCT (1608TYPE) F-RANK MTL.FILM RESISTOR R117 F5399147R0 15KJ (1608TYPE) MTL.FILM RESISTOR R12, R16, R36 F5429371R0 18KF 1PCT (1608TYPE) F-RANK MTL.FILM RESISTOR...
  • Page 7 Mar. 2006 AC-3 WIRING, CABLE H4009595R0 WIRING 1007 BLUE 110X6X3 H4009689R0 WIRING 1007 BLACK 105X6X3 G3487434R0 FLAT CABLE 9P L=90MM CN2, CN5 SCREWS H5039112R0 WASHER 9X14X0.5 H5029820R0 THUMB SCREW 3X10 FEBC H5019413R0 SCREW M3X10 BINDING MACHINE FEBC H5029325R0 SCREW 3X6...

  • Page 8: Checking Version Number

    Mar. 2006 AC-3 Checking Version Number Test Mode A (2. DC Leakage Check–10. MODE Switching Check) Connect an AC adaptor. Connect an AC adaptor. Adjust the REVERB, LEVEL, BODY and TOP knobs to MIN. Adjust all of the REVERB, LEVEL, BODY and TOP knobs to MIN.
  • Page 9 While the CHECK indicator lights, CPU and DSP are tested automatically. If you pull out the plug connected to the INPUT jack, AC-3 exits the test mode If there is no problem, the CHECK indicator blinks and turns off. and turns off the power.
  • Page 10 Mar. 2006 AC-3 6. TOP Volume Check Remove the connection of the LINE OUT jack, and connect an oscilloscope to the G.AMP OUT jack. * If the maximum value of BODY volume isn’t detected, the TOP Volume Check 10. Confirm the output waves of LINE OUT and G.AMP OUT are as follows.
  • Page 11 Mar. 2006 AC-3 9. AF/AD Check 11. Cross Talk Check Adjust the MODE knob to PIEZO. Enter Test Mode B. Refer to Test Mode B (11. Cross Talk Check) (p. 8). The CHECK indicator turns on. While the CHECK indicator lights, CPU and DSP are tested automatically.
  • Page 12 Remove the plug connected to the LINE OUT jack, and connect the monitor speaker to the G.AMP OUT jack. 10. Drop the AC-3 twice from the height of about 10 cm to shock its body. 11. Confirm no abnormal noise sounds from the speaker.

  • Page 13: Circuit Board

    Mar. 2006 AC-3 Circuit Board fig.PWB.eps...

  • Page 14: Circuit Diagram

    Mar. 2006 AC-3 Circuit Diagram fig.circuit.eps@L AC-3 MAIN BOARD ASSY 75D933P0R0 (PCB F2927039R0 00 1/6) EARTH_TERMINAL (RV-2) IC4C C116 10/10 M5218AFP GRM31MF51A106 2SK879Y 4.7k 150p EARTH_TERMINAL (RV-2) 0.0022 10/10 150p 4.7k NIU(1SS362) GRM31MF51A106 G.AMP OUT 10/10 1SS387 0.0022 150p GRM31MF51A106 2SK879Y 4.7k...
  • Page 15 AC-3 MEMO...

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