Instruction/ maintenance manual of the product Bass Amplifier Yamaha
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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 ..............................
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.
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.
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 .
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.
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.
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&apo.
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.
F-20B 1 P ARTS LIST B ASS AMP LIFIER CONTENS OVERALL ASSEMBL Y .................................................................................. 2 PRE-MAIN UNIT .........................................................................................
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.
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 -- -- --.
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.
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 .
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.
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.
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.
An important point after buying a device Yamaha Bass Amplifier (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Yamaha Bass Amplifier yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Yamaha Bass Amplifier - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Yamaha Bass Amplifier you will learn all the available features of the product, as well as information on its operation. The information that you get Yamaha Bass Amplifier will certainly help you make a decision on the purchase.
If you already are a holder of Yamaha Bass Amplifier, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Yamaha Bass Amplifier.
However, one of the most important roles played by the user manual is to help in solving problems with Yamaha Bass Amplifier. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Yamaha Bass Amplifier along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
