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EV-204 / EV205
This document is printed on chlorine free (ECF) paper with soy ink.
NV
011636
EV-204: 20020420-129000
EV-205: 20020420-145000
ELECTRIC VIOLIN
SERVICE MANUAL
EV-204AM
CONTENTS
SPECIFICATIONS .............................................................................. 3
PANEL LAYOUT .................................................................................. 4
CIRCUIT BOARD LAYOUT ................................................................. 6
BLOCK DIAGRAM .............................................................................. 7
DISASSEMBLY PROCEDURE ........................................................... 8
IC BLOCK DIAGRAM ........................................................................ 12
CIRCUIT BOARDS ........................................................................... 12
INSPECTIONS .................................................................................. 13
.......................................................................................................... 14
TUNING ............................................................................................ 15
OVERALL CIRCUIT DIAGRAM
PARTS LIST
EV-205CB
HAMAMATSU, JAPAN
0.944K-019
Printed in Japan 2002.05
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Table of Contents
Related Manuals for Yamaha EV-204
Summary of Contents for Yamaha EV-204
- Page 1 ELECTRIC VIOLIN EV-204 / EV205 SERVICE MANUAL EV-204AM EV-205CB CONTENTS SPECIFICATIONS ................3 PANEL LAYOUT .................. 4 CIRCUIT BOARD LAYOUT ..............6 BLOCK DIAGRAM ................7 DISASSEMBLY PROCEDURE ............8 IC BLOCK DIAGRAM ................ 12 CIRCUIT BOARDS ................12 INSPECTIONS .................. 13 ......................
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Page 2: Important Notice
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 industry, and more specifically Yamaha Products, are already known and under- stood by the users, and have therefore not been restated. -
Page 3: Specifications
EV-205 : 601 (L) x 206 (W) x 132 (H) mm 23-11/16” (L) x 8-1/8” (W) x 5-3/16” (H) Weight (with battery) EV-204: 700g (1 lbs. 8 oz.) EV-205: 717g (1 lbs. 9 oz.) Color AMBER, PEARL RED, COSMIC BLUE... -
Page 4: Panel Layout
EV-204 / EV-205 PANEL LAYOUT FRONT Tuning peg Neck Fingerboard 5th string (C): EV205 Oniy 2nd string (A) 4th string (G) 1st string (E) 3rd string (D) Sound Board Body Frame Bridge Chin rest Master Volume Tailpiece Wire Tailpiece End pin... -
Page 5: Phones Volume
EV-204 / EV-205 CONTROL PANEL side Mode Select Switch [CONTROLLED / DIRECT] VOLUME PHONES LINE OUT Pickup Level Control 1-5 (located inside) CONTROLLED DIRECT Pickup Level Control MAIN (located inside) PHONES VOLUME MAIN PHONES jack: Stereo mini type LINE OUT jack: Standard phone type... -
Page 6: Circuit Board Layout
EV-204 / EV-205 CIRCUIT BOARD LAYOUT... -
Page 8: Disassembly Procedure
EV-204 / EV-205 DISASSEMBLY PROCEDURE PREPARATION Before disassembling the unit, confirm the following items. • Remove the chin rest. • Remove the battery from the battery box. (Fig.1) • Loosen all the strings and remove them. (Fig.2) (Fig. 1) (Fig. 2) - Page 9 EV-204 / EV-205 AMP Circuit Board (Time required: about 3 min) Remove the amplifier unit. (See procedure 1) Remove the four (4) screws marked [60]. (Fig.4) Remove the hexagonal nut marked [110]. (Fig.4) Remove the VR knob marked [30]. The AMP circuit board can then be removed.
- Page 10 EV-204 / EV-205 Tailpiece Assembly (Time required: about 4 min) Remove the amplifier unit. (See procedure 1) Remove the connector assembly from the AMP circuit board. The tailpiece assembly can then be removed. (Fig.6) Volume Assembly (Time required: about 5 min) Remove the tailpiece assembly.
- Page 11 EV-204 / EV-205 Sound Plate Assembly (Time required: about 5 min) Remove the tailpiece assembly. (See procedure 3) Remove the bridge assembly. (See procedure 5) Remove the screw marked [60] and the screw marked [70]. The sound plate assembly can then be removed.
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Page 12: Ic Block Diagram
EV-204 / EV-205 IC BLOCK DIAGRAM NJM4580AV (X2474A00) NJM4556V (X2473A00) Dual Operational Amplifier Dual Operational Amplifier AMP: U1, U2, U3, U4 AMP: U5 +DC Voltage +DC Voltage Output A Output A Supply Supply Inverting Inverting Output B Output B Input A... - Page 13 EV-204 / EV-205 INSPECTION Preparation To check the unit, following jigs are required. • Headphones • Guitar Amplifier • Battery (6F22Y or 6LR61) Set each control as follows. • Master Volume: Maximum • [VOLUME] knob: Center • MODE select switch: DIRECT •...
- Page 14 EV-204 / EV-205...
- Page 15 EV-204 / EV-205 TUNING First, set up the bridge and then proceed with tuning. [EV-204] 4th string 1st string Slit • The lower side of the bridge supports the 1st string (E), the higher side supports the 4th string (G) [EV205: the 5th string (C)]. Make sure the bridge is placed properly. (Make...
- Page 16 <P.1> EV-204 / EV205 EV204 / EV205 OVERALL CIRCUIT DIAGRAM (AMP) Master Volume CON3 OP AMP 500kA RK08H1130(500kA) 2200p OP AMP 10/16 10/16 CON6 1/50 2.2k NJM4580 1/50 1/50 NJM4580 SSSF040800 2200p 100k 100k RK08H1130(500kA) OP AMP 4.3k RB160L-40TE25 Battery...
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Page 17: Parts List
EV204 / EV205 ELECTRIC VIOLIN EV-204 / EV205 PARTS LIST CONTENTS OVERALL ASSEMBLY ...................... 2 ELECTRICAL PARTS ....................... 5 Note) DESTINATION ABBREVIATIONS Australian model South African model British model Chinese model Canadian model South-east Asia model German model Taiwan model European model U.S.A. -
Page 18: Overall Assembly
EV204 / EV205 OVERALL ASSEMBLY A100 EV204 EV204 C110 D60b D10b C100 D10a D60a D10d D10c C120 EV204... - Page 19 OVERALL ASSEMBLY EV-204/EV-205 Overall Assembly EV-205 AM (V876660) Overall Assembly EV-205 CB (V904410) Overall Assembly EV-205 PR (V904420) Overall Assembly EV-204 AM (V904450) Overall Assembly EV-204 CB (V904460) Overall Assembly EV-204 PR (V904470) Body Assembly EV-205 AM (V876030) Body Assembly...
- Page 20 EV204 / EV205 DESCRIPTION REMARKS PART NO. QTY RANK REF NO. Amplifier Unit (V876720) V8767400 Amplifier Case V8767500 Slide Button CONTROLLED-DIRECT VP224600 Knob VOLUME V8767600 Balance Knob 1,2,3,4,5,MAIN V8758500 Shield Sheet VA122000 PWH Tapping Screw-P 3.0X8-8 MFZN2Y V8830600 Precision Screw 1.4X3 MFZN2BL V8769200 Wiring Assembly...
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Page 21: Electrical Parts
EV204 / EV205 ELECTRICAL PARTS DESCRIPTION REMARKS PART NO. QTY RANK REF NO. ELECTRICAL PARTS V8770000 Circuit Board (X2525B0) V8770000 Circuit Board (X2525B0) V8776400 Rotary Variable Resistor V8776600 Rotary Variable Resistor UF037100 Electrolytic Cap. (chip) 10 16V UF066100 Electrolytic Cap. (chip) 1 50V UF066100 Electrolytic Cap.