Yamaha-F-20-B-Service-Manual电路原理图.pdf

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1、SERVICE MANUAL HAMAMATSU, JAPAN 1.507K-033 K Printed in Japan 2001.08 011592GA 20010720-17800 CONTENTS SPECIFICATIONS . 3 PANEL LAYOUT. 3 CIRCUIT BOARD LAYOUT. 4 BLOCK DIAGRAM . 4 DISASSEMBLY PROCEDURE . 5 CIRCUIT BOARDS . 7 IC BLOCK DIAGRAM. 8 INSPECTIONS. 8 PARTS LIST OVERALL CIRCUIT DIAGRAM BASS

2、AMPLIFIER This document is printed on chlorine free (ECF) paper with soy ink. RadioFans.CN 收音机爱 好者资料库 2 F-20B IMPORTANT NOTICE This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed that basic service procedures inherent to the indus

3、try, and more specifically Yamaha Products, are already known and understood by the users, and have therefore not been restated. WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in per- sonal injury, destruction of expensive components and fa

4、ilure of the product to per form as specified. For these reasons, we advise all Yamaha product owners that all service required should be performed by an authorized Yamaha Retailer or the appointed service representative. IMPORTANT:This presentation or sale of this manual to any individual or firm d

5、oes not constitute authorization, certifica- tion, recognition of any applicable technical capabilities, or establish a principal-agent relationship of any form. The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research engineering, and service d

6、epartments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefor, inevitable and changes in specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributors Service Division. WAR

7、NING:Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss). IMPORTANT:Turn the unit OFF during disassembly and parts replacement. Recheck

8、all work before you apply power to the unit. WARNING: CHEMICAL CONTENT NOTICE! The solder used in the production of this product contains LEAD. In addition, other electrical / electronic and / or plastic (where applicable) components may also contain traces of chemicals found by the California Healt

9、h and Welfare Agency (and possibly other entities) to cause cancer and / or birth defects or other reproductive harm. DO NOT PLACE SOLDER, ELECTRICAL / ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT SO EVER! Avoid prolonged, unprotected contact between solder and your skin! When

10、soldering, do not inhale solder fumes or expose eyes to solder / flux vapor! If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food. IMPORTANT NOTICE FOR THE UNITED KINGDOM Connecting the Plug and Cord WARNING:THIS APPARATU

11、S MUST BE EARTHED IMPORTANT: The wires in this main lead are coloured in accor- dance with the following code: GREEN-AND-YELLOW: EARTH BLUE: NEUTRAL BROWN: LIVE As the colours of the wires in the main lead of this apparatus may not correspond with the coloured markings identifying the terminals in y

12、our plug, proceed as follows: The GREEN-and-YELLOW wire must be connected to the terminal in the plug that is marked with the letter E or the safety earth symbol (or coloured GREEN or GREEN-and-YELLOW). The BLUE wire must be connected to the terminal that is marked with the letter N (or coloured BLA

13、CK). The BROWN wire must be connected to the terminal that is marked with the letter L (or coloured RED). This applies only to products distributed by Yamaha Kemble Music (U. K.) Ltd. WARNING Components having special characteristics are marked and must be replaced with parts having specification eq

14、ual to those originally installed. RadioFans.CN 收音机爱 好者资料库 3 F-20B SPECIFICATIONS PANEL LAYOUT ? Rated Output Power:20W Speaker:25cm x 1 Controls:VOLUME, TREBLE, HIGH MID, LOW MID, BASS, Input Level Select Switch (PASSIVE/ACTIVE) Input/Output Terminals:INPUT, AUX IN, PHONES Power Consumption:25W/120

15、V (UL, CSA) 25W/230V (E, BS) Power Requirements:U.S. and Canadian mod- els: 120V, 60Hz General model: 230V, 50Hz Dimensions (W x H x D) : 357 x 453 x 242mm (14.1 x 17.8 x 9.5) Weight:10.5kg (23 lbs 2 oz) ? INPUT ? PASSIVE/ACTIVE (Input Level Select Switch) ? VOLUME * No sound is produced when the VO

16、LUME knob is set to 0. ACTIVE EQUALIZER ? TREBLE ? HIGH MID ? LOW MID ? BASS ? POWER INDICATOR * The lamp will light when the amplifiers power switch is ON. ? AUX IN * Use the volume control on the audio device to control its volume level. ? PHONES * The speaker will produce no sound when a pair of

17、headphones is connected to this jack. ? POWER ? ? 4 F-20B CIRCUIT BOARD LAYOUT 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 SUPPLY CIRCUIT POWER TRANSFORMER 4 Sp

18、eaker PHONE AUX IN CN2 4P CN1 2P CN3 3P CN4 5P CN5 5P POWER SWITCH SW1 T2 T1 T4 T1 T2 G U, C, S, BS MAIN 1/2 MAIN 2/2 T3 GAIN SELECT ACTIVE CH.PASSIVE CH. BASS VR5 LOW MID VR4 HIGH MID VR3 TREBLE VR2 VR1 IC3 57 VOLUME JK3 JK2 JK1 SW2 IC1,IC2 OP AMP OP AMP 8 4 +12V -12V -B +B 5 3 +12V -12V 8 4 ? Top

19、View? Side View ? Front View 5 F-20B DISASSEMBLY PROCEDURE 30 x 4 60a A BackBoard SpeakerPre-Main UnitPre-Main Unit (Fig.1) MAIN1/2 Circuit Board Needle-nose plier MAIN1/2 Circuit Board Needle-nose plierNeedle-nose plier MAIN1/2 Circuit Board P40P40P40 (Fig. 2) 30: Truss Head Screw 4.0X25 MFZN2BL (V

20、N347600) A: Bind Head Tapping Screw 4.0X25 FCRM3-BL (EI340256) 60a: Bind Head Screw (VB403600) 1.Pre-Main Unit (Time required: about 2 min) 1-1Remove the eight (8) screws marked A. The back board can then be removed. (Fig.1) 1-2Pull out the speaker wires. (Fig.1) 1-3Remove the four (4) screws marked

21、 30. The pre- main unit can then be removed by sliding it backward. (Fig.1) 2.Speaker (Time required: about 2 min) 2-1Remove the back board. (See Procedure 1-1) 2-2Pull out the speaker wires. (Fig.1) 2-3Remove the four (4) screws marked 60a. The speaker can then be removed. (Fig.1) 3.MAIN 1/2 Circui

22、t Board (Time required: about 4 min) 3-1Remove the pre-main unit. (See Procedure 1) 3-2Remove the five (5) knobs marked P100 and the five (5) hexagonal nuts marked C. (Fig.5) 3-3Remove the hexagonal nut marked A120 and the hexagonal nut marked A140. (Fig.5) 3-4Push the hooks of the spacer support (a

23、t the arrow symbol area of illustration) with a needle-nose plier to unlock. The MAIN 1/2 circuit board can then be removed. (Fig.2) 6 F-20B MAIN 1/2 MAIN 2/2 P100, CA120 P60P70P80 A140 P70P60P40P40 Power Transformer A120: Hexagonal Nut 9.0 12X2 MFNI33 (LX200060) A140: Hexagonal Nut 12.0 14X2 MFNI33

24、 (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 (V7018100) P100: Knob (V6955100) (Fig. 5) P60P70P60P70P60P70 Power TransformerPower TransformerPower Transformer (Fig.4) P80P80P80 MAIN1/2 Circuuit BoardMAIN1/2

25、 Circuuit BoardMAIN1/2 Circuuit Board MAIN1/2 Circuuit BoardMAIN1/2 Circuuit BoardMAIN1/2 Circuuit Board (Fig. 3) 4.MAIN 2/2 Circuit Board (Time required: about 3 min) 4-1Remove the pre-main unit. (See Procedure 1) 4-2Remove the screw marked C80. The MAIN 2/2 circuit board can then be removed. (Fig.

26、3, Fig.5) 5.Power Transformer (Time required: about 4 min) 5-1Remove the pre-main unit. (See Procedure 1) 5-2While holding the nuts marked P70 with a spanner, remove the two (2) screws marked P60. The power transformer can then be removed. (Fig.4) 7 F-20B HIGH MIDLOW MIDBASSAUX INPHONES POWER to SPE

27、AKER to MAIN 2/2 CN4 from POWER TRANSFORMER to POWER TRANSFORMER from AC CORD to POWER SW A A INPUT GAIN SELECT VOLUMETREBLE 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, B):CNA-V755480 ? MAIN2/2 CIRC

28、UIT BOARD Component side to MAIN 1/2 CN5 VERSION FUSE RATE INDICATION J, U250V 315mAL E, BS250V T160mAL Must be erased Must be erased Component side 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

29、 +DC Voltage Supply Output B Inverting Input B Non-Inverting Input B Inverting Input A +- +- MAIN: IC1,IC2,IC3 1.Preparation To inspect the main unit, the following jigs are required. CD player Headphones Before turning the power on, set all the knobs on the panel to 0. Raise the Input Level Select

30、Switch to select PASSIVE position. 2.Power supply Connect the power cord to the suitable power supply socket for each version. (UC-120V, E&BS-220V) 3.Inspection procedure 3-1Input the audio signal of CD player to the AUX IN jack. 3-2Make sure that rotating the VOLUME knob to the right (or left) make

31、s the sound gradually larger (or smaller). 3-3Make sure that rotating the TREBLE knob to the right (or left) boosts (or cuts) the high frequency. 3-4Make sure that rotating the HIGH MID knob to the right (or left) boosts (or cuts) the upper-middle frequency. 3-5Make sure that rotating the LOW MID kn

32、ob to the right (or left) boosts (or cuts) the lower-middle frequency. 3-6Make sure that rotating the BASS knob to the right (or left) boosts (or cuts) the low frequency. 3-7Make sure that the sound becomes smaller when you depress the Input Level Select Switch to select ACTIVE position. 3-8Raise th

33、e Input Level Select Switch again to select PASSIVE position. Make sure that the audio signal sounds over the speaker. 3-9Connect the headphones to the PHONES jack. Make sure that the speaker produces no sound and the audio signal sounds over the headphones. 3-10Set all the knobs on the panel to 0 a

34、nd finish the inspection. F-20B 1 PARTS LIST BASS AMPLIFIER CONTENS OVERALL ASSEMBLY .2 PRE-MAIN UNIT .4 ELECTRICAL PARTS .6 Note) DESTINATION ABBREVIATIONS A:Australian modelM:South African model B:British modelO:Chinese model C:Canadian modelQ:South-east Asia model D:German modelT:Taiwan model E:E

35、uropean modelU:U.S.A. model F:French modelV:General export model (110V) H:North European modelW:General export model (220V) I:Indonesian modelN,X: General export model J:Japanese modelY:Export model WARNING Components having special characteristics are marked and must be replaced with parts having s

36、pecifications equal to those originally installed. The numbers in “QTY” shows quantities for each unit. The parts with “-” in “Part No.” are not available as spare parts. The second letter of the shaded () part number is I, not one. The second letter of the shaded () part number is O, not zero. F-20

37、B 2 OVERALL ASSEMBLY 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.PART NO.DESCRIPTIONREMARKSQTYRANK 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 C110 A -

38、 - - - V7461100 - - - - VN347600 ET500040 - - - XO361A00 VB403600 V7461100 - V5969000 21770200 V6327200 V6327300 V7017900 V6327400 EP030310 03765580 V7363300 VN729100 EI340256 * * * OVERALL ASSEMBLY Overall Assembly Overall Assembly Overall Assembly Overall Assembly Overall Cabinet Assembly Pre-Main

39、 Unit Pre-Main Unit Pre-Main Unit Pre-Main Unit Truss Head Screw Flat Washer Label Label Label Speaker Unit Bind Head Screw OVERALL CABINET ASSEMBLY Overall Cabinet Assembly Cabinet Assembly Corner Protector Oval Head Screw Handle Handle Holder Oval Head Screw Foot Bind Head Tapping Screw-1 Flat Was

40、her Name Plate Bind Head Tapping Screw-1 Bind Head Tapping Screw 4.0X25 MFZN2BL 4.0X10X0.8 MFZN2BL 4ohm 30W 3.0X12 MFZN2BL KPBO KAH1D-205 KPBO KAH3D400-A 4.0X25 MFZN2BL KPBO KRRU19 3.0X16 MFZN2BL 3.0X8X0.5 MFZN2BL 3.0X10 MFZN2BL 4.0X25 FCRM3-BL F-20B J (V745880) U,C (V745890) H (V745900) B(V745910)

41、J(V745930) U,C(V745940) H (V745950) B (V745960) J (V745970) U,C(V745980) H,B (V745990) F-20B (V746050) 4 4 4 6 12 2 2 4 4 4 2 8 01 01 01 01 01 01 01 01 01 01 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 P120P110 A100 A110 A130 A140 A120 Amp Kit P77

42、 PRE-MAIN UNIT F-20B 5 REF NO.PART NO.DESCRIPTIONREMARKSQTYRANK RANK: Japan only*New parts P10 P20 P30 P30 P30 P30 P40 P50 P60 P70 P75 P77 P80 P90 P100 P110 P120 A10 A10 A20 A30 A40 A50 A50 A50 A60 A70 A70 A70 A70 A80 A90 A100 A110 A120 A130 A140 - - - - V6954800 V7460600 - - - - V7511400 V7017600 V

43、7018000 VB837300 VB501900 V7834000 V7018100 V7554300 V6955100 ET900050 - - - - - V7554700 V7554800 VV849300 V7356900 V7054700 XZ805A00 XZ806A00 XZ807A00 VV104600 V6286700 V6286900 V6287000 V6287100 V7356700 V7356800 ET800150 VL802300 LX200060 VB508700 ES200210 PRE-MAIN UNIT Pre-Main Unit Pre-Main Un

44、it Pre-Main Unit Pre-Main Unit Chassis Panel Sheet Amp Kit Amp Kit Amp Kit Amp Kit Spacer Support Heat Sink Pan Head Screw Hexagonal Nut Spring Washer Vibration-proof Tape Pan Head Screw Button Knob Toothed Lock Washer-B Earth Mark Amp Kit Amp Kit Amp Kit Amp Kit Circuit Board Circuit Board Insulati

45、on Sheet Sleeve Power SW Transformer Transformer Transformer Cord Holder Cord Cord Cord Cord Cord Strain Relief Cord Strain Relief Toothed Lock Washer-A Flat Washer Hexagonal Nut Flat Washer Hexagonal Nut PINGOOD LCC-10 4.0X10 MFZN2BL #1 4.0 MFZN2Y 4.0 MFZN2Y 3.0X10 MFZN2BL GA-RED 4.0 MFZN2BL MAIN M

46、AIN BFG-20AD 19X24 12SWS0220 SDDJE1-A-2 J UC E CV-100 J VCTF UC 3 SJT 18/3 E 3 HO5VV-F UK 3 HO5VV-F KR-61 KITAGAWA KF-41 KITAGAWA 9.0 MFZN2Y 9X14 0.5 FNM3 9.0 12X2 MFNI33 18X12.5 0.6 MFZN2 12.0 14X2 MFNI33 F-20B J(V745930) U,C(V745940) H(V745950) B(V745960) J(V746070) U,C(V746080) H(V746090) B(V746100) GAIN SELECT VOLUME,TREBLRE,HIGH MID LOW MID,BASS U,C,H,B U,C,H,B (V777110) J (V746070) U,C(V746080) H (V746090) B (V746100) J,U,C H,B POWER ON/OFF J U,C H,B J U,C H B 2 2 2 2 2 5 2 05 01 01 01 01 02 05 01 04 01 01 01 01 * * * REF NO.PART NO.DESCRIPTIONREMARKSQTYRANK F-20B 6 RANK