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Yamaha Bass Amplifier manual

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Table of contents for the manual

  • Page 1

    SER VICE MANU AL HAMAMA TSU, JAP AN 1.507K-033 K Printed in Japan 2001.08 01 1592 GA 20010720-17800 CONTENTS SPECIFICA TIONS .............................................................................. 3 P ANEL LA YOUT .................................................................................. 3 CIRCUIT BOARD LA YOUT ......................[...]

  • Page 2

    2 F-20B IMPOR T ANT NO TICE This manual has been provided for the use of authorized Y amaha Retailers and their service personnel. It has been assumed that basic service procedures inherent to the industry , and more specifically Y amaha Products, are already known and understood by the users, and have therefore not been restated. W ARNING: Failure[...]

  • Page 3

    3 F-20B SPECIFICA TIONS P ANEL LA YOUT  Rated Output Power: 20W Speaker: 25cm x 1 Controls: VOLUME, TREBLE, HIGH MID, LOW MID, BASS, Input Level Select Switch (P ASSIVE/ACTIVE) Input/Output T erminals: INPUT , AUX IN, PHONES Power Consumption: 25W/120V (UL, CSA) 25W/230V (E, BS) Power Requirements: U.S. and Canadian mod- els: 120V , 60Hz General[...]

  • Page 4

    4 F-20B CIRCUIT BOARD LA YOUT MAIN 1/2 MAIN 1/2 MAIN 1/2 MAIN 2/2 MAIN 2/2 AC Cord Power Transformer BLOCK DIAGRAM +B +12V -12V -B GND POWER AMP IC4 IC1 IC3 1 2 31 1 4 INPUT FUSE FZ1 ACTIVE TYPE TONE CONTROL POWER SUPPL Y CIRCUIT POWER TRANSFORMER 4 Ω Speaker PHONE AUX IN CN2 4P CN1 2P CN3 3P CN4 5P CN5 5P POWER SWITCH SW1 T2 T1 T4 T1 T2 G U, C, [...]

  • Page 5

    5 F-20B DISASSEMBL Y PROCEDURE [30] x 4 [60a] [A] BackBoard Speaker Pre-Main Unit Pre-Main Unit (Fig.1) MAIN1/2 Circuit Board Needle-nose plier Needle-nose plier MAIN1/2 Circuit Board [P40] [P40] (Fig. 2) [30]: T russ Head Screw 4.0X25 MFZN2BL (VN347600) [A]: Bind Head T apping Screw 4.0X25 FCRM3-BL (EI340256) [60a]: Bind Head Screw (VB403600) 1. P[...]

  • Page 6

    6 F-20B MAIN 1/2 MAIN 2/2 [P100], [C] [A120] [P60] [P70] [P80] [A140] [P70] [P60] [P40] [P40] Power Transformer [A120]: Hexagonal Nut 9.0 12X2 MFNI33 (LX200060) [A140]: Hexagonal Nut 12.0 14X2 MFNI33 (ES200210) [P60]: Pan Head Screw 4.0X10 MFZN2BL (V7018000) [P70]: Hexagonal Nut #1 4.0 MFZN2Y (VB837300) [P80]: Bind Head Screw-1 3.0X16 MFZN2BL (V701[...]

  • Page 7

    7 F-20B HIGH MID LO W MID BASS A UX IN PHONES POWER to SPEAKER to MAIN 2/2 CN4 from PO WER TRANSFORMER to PO WER TRANSFORMER from A C CORD to PO WER SW A' A INPUT GAIN SELECT V OLUME TREBLE A' A  MAIN1/2 CIRCUIT BOARD CIRCUIT BOARDS MAIN 1/2 (J, U, C): CNA-V755470 MAIN 1/2 (H, B): CNA-V755480 MAIN 2/2 (J, U, C): CNA-V755470 MAIN 2/2 (H[...]

  • Page 8

    8 F-20B INSPECTIONS IC BLOCK DIAGRAM BA4558 (XO078A00) Dual Operational Amplifier 1 2 3 4- V 8 7 6 5 Output A +V Non-Inverting Input A -DC Voltage Supply +DC Voltage Supply Output B Inverting Input B Non-Inverting Input B Inverting Input A +- +- MAIN: IC1,IC2,IC3 1. Preparation T o inspect the main unit, the follo wing jigs are required. CD player [...]

  • Page 9

    F-20B 1 P ARTS LIST B ASS AMP LIFIER CONTENS OVERALL ASSEMBL Y .................................................................................. 2 PRE-MAIN UNIT ............................................................................................ 4 ELECTRICAL P ARTS ...........................................................................[...]

  • Page 10

    F-20B 2 OVERALL ASSEMBL Y 50 20 10 C40 C60 C50 C60 C50 C30 C30 A C20 C70 C90 C80 40 30 C100 C110 Overall Cabinet Assembly Pre-Main Unit 60 60a[...]

  • Page 11

    F-20B 3 REF NO . P ART NO. DESCRIPTION REMARKS QTY RANK RANK: Japan only *New parts 10 20 20 20 20 30 40 50 50 50 60 60a C10 C20 C30 C40 C50 C60 C70 C80 C90 C100 C1 10 A -- -- -- -- V7461 100 -- -- -- -- VN347600 ET500040 -- -- -- XO361A00 VB403600 V7461 100 -- V5969000 21770200 V6327200 V6327300 V7017900 V6327400 EP030310 03765580 V7363300 VN72910[...]

  • Page 12

    F-20B 4 A10 A70 A60 A40 A10 A30 A80 A90 A20 P60 P40 P60 P30 P75 P70 P50 P10 P20 P90 P80 A50 P100 P120 P110 A100 A110 A130 A140 A120 Amp Kit P77 PRE-MAIN UNIT[...]

  • Page 13

    F-20B 5 REF NO . P ART NO. DESCRIPTION REMARKS QTY RANK RANK: Japan only *New parts P10 P20 P30 P30 P30 P30 P40 P50 P60 P70 P75 P77 P80 P90 P100 P1 10 P120 A10 A10 A20 A30 A40 A50 A50 A50 A60 A70 A70 A70 A70 A80 A90 A100 A1 10 A120 A130 A140 -- -- -- -- V6954800 V7460600 -- -- -- -- V751 1400 V7017600 V7018000 VB837300 VB501900 V7834000 V7018100 V7[...]

  • Page 14

    REF NO . P ART NO. DESCRIPTION REMARKS QTY RANK F-20B 6 RANK: Japan only *New parts V7554700 V7554800 V7554700 V7554800 -- -- -- V6609900 VV291400 UR866100 VZ353500 UR847100 VZ353500 VZ353500 UR866330 VV061200 UR865470 VV060600 UR865100 VV059800 VV062600 VZ353500 UR866100 VV059800 VZ353500 UR866100 FG613100 UR866100 UR837470 VV062800 VV062800 UR847[...]

  • Page 15

    F-20B 7 REF NO . P ART NO. DESCRIPTION REMARKS QTY RANK RANK: Japan only *New parts HF456330 HF457330 HF457330 HF458100 HF457100 HF457330 HF456100 HF457100 HF457470 HF455470 HF457220 VC740100 VC745000 HF456470 HF455560 HF455560 VR140800 V6607700 V7649200 V7649200 V7649200 V7649200 VG440200 VG440200 XO361A00 V7054700 XZ805A00 XZ806A00 XZ807A00 V6286[...]

  • Page 16

    ABCD E F G H 1 2 3 4 5 F-20B F-20B F-20B <P.1> OVERALL CIRCUIT DIAGRAM Note: See parts list for details of circuit board component parts. TRANS FORMER MAIN 1/2 MAIN 2/2 POWER ON/OFF INPUT AUX IN PHONES J, U, C S, BS 250V 315mA 250V T160mA L WARNING D2SBA20 (VP344100) DIODE STACK 1.5A 200V DB1 GAIN SELECT BASS LOW MID HIGH MID TREBLE VOLUME OP[...]