Yamaha RBX374 User manual

Copyright (c) Yamaha Corporation. All rights reserved. PDF-K351 ’04.10
RBX374/RBX375
SERVICE MANUAL
EG 011746
ELECTRIC BASSES
HAMAMATSU, JAPAN
CONTENTS
OVERALL ASSEMBLY ............................................................. 2
ELECTRICAL PARTS ................................................................ 6
CIRCUIT BOARDS .................................................................... 6
CIRCUIT DIAGRAM.................................................................. 7
WIRING..................................................................................... 8
SPECIFICATIONS ..................................................................... 8
RBX375RBX374
<Other color>
BL
FSL
RM
<Other color>
RM
BL
FSL
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 Health 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 COM-
PONENTS INYOUR MOUTH FOR ANY REASON WHAT SO EVER!
Avoid prolonged, unprotected contact between solder and your skin! When
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.

RBX374/RBX375
2
E03
E04
E02
E03
E04
E01
E05
E05
Bridge Assembly:
BB004 Black (QC829400)
OVERALL ASSEMBLY
Jack Installation
RBX374
F06
F06a
F06b
B01
B03
B02
E01
E08
E03
E02 E03
E04 E05
E04 E05
A01
E13
E15
E14
E16
F02 F03
E18 E19
F06
E17 F04 F05
D01
E10E09
E07E06
G02
G03
G01
E11
E12
E14 E15 E16
A01a
G01a F01b
E17 F04 F05
F01a
E17 F04 F05
F01
F01c
F06a
E17 F04 F05F01c
F06b
G05
G06
G04
G04a
PICKUP BALANCER: A+C 500KΩ
BASS Boost/Cut: B 50KΩ
TREBLE Boost/Cut: B 50KΩ
MASTER VOLUME: B 20KΩ
E11
E01 E02
Tuning Machine Assembly

RBX374/RBX375
3
OVERALL ASSEMBLY RBX374
A01 Neck Assembly RM with Head Panel
A01 Neck Assembly BL with Head Panel
A01 Neck Assembly FSL with Head Panel
A01a Head Panel ABS RM
A01a Head Panel ABS BL
A01a Head Panel ABS FSL
D01 Body
E01 Tuning Machine Assembly RM1243L (Black) Left 2 09
E02 Tuning Machine Assembly RM1243 (Black) Right 2 09
E03 Bushing with Tuning Machine Ass'y 4
E04 Spacer with Tuning Machine Ass'y 4
E05 Round Head Wood Screw 2.4X10 FCM3BL Black 4 01
E06 Rod Cover Black 03
E07 Oval HeadWood Screw 2.4X10 FCM3BL Black
E08 Nut Urea 40mm (Black)
E09 Neck Joint Bushing 1.5X4t (Black) 4
E10 Oval Head Tapping Screw 4.5X40 FCM3BL Black 4
E11 Bridge Assembly BB004 P=20mm Black
E12 Oval Head Tapping Screw 3.5X25 FCM3BL Black 3 01
E13 Strings Nickel Wound 1set
E14 Strap Button ST-type (Black) 2 01
E15 Oval Head Tapping Screw 3.5X25 FCM3BL Black 2 01
E16 Spacer Felt (Black) 2 01
E17 Knob Assembly Metal Dome (Black) VOL.,BALANCER,TREBLE,BASS 402
E18 Back Cover Electrical (Black)
E19 Oval Head Tapping Screw 3.0X12 FCM3BL Black 4 01
F01 Electrical Unit (QC83110)
F01a Variable Resistor 20K ohm B MASTER VOLUME 04
F01b Variable Resistor 500K ohm A+C CC PICKUP BALANCER 05
F01c Circuit Board with BASS,TREBLE Volume
F02 Box for Dry Cell Black
F03 Oval Head Wood Screw 2.4X13 FCM3BL Black 4 03
F04 Hexagonal Nut 8X1.8t with Volume 4
F05 Flat Washer 8X0.6t with Volume 4
F06 Jack Nickel 07
F06a Rubber Ring
F06b Hexagonal Nut
G01 Pickup Assembly Hum-Cancelled FRONT (Black)
G01a Pickup Cover ABS (Black)
G02 Round Head Wood Screw 3.1X25 FCM3BL Black 3 01
G03 Pickup Cushion 11X13 Spring 3
G04 Pickup Assembly Hum-Cancelled REAR (Black)
G04a Pickup Cover ABS (Black)
G05 Round Head Wood Screw 3.1X25 FCM3BL Black 3 01
G06 Pickup Cushion 11X13 Spring 3
H01 Accessory Unit G-1
Cord CABLE(2.5BK) 05
Wrench #1.5 03
Wrench #5 04
H02 Battery 6F22 9V Dry Cell
Bridge Assembly BB004 P=20mm Black
B01 Bridge Plate Zinc 93.5X46
B02 Bridge Piece Assembly 14mm, M3X6, 3.0X15 1,4 Strings 2
B03 Bridge Piece Assembly 14mm, M3X8, 3.0X15 2,3 Strings 2
: New Parts RANK: Japan only
REF NO.
PART NO. DESCRIPTION REMARKS
QTY RANK
AAX60020
AAX60030
AAX60040
--
--
--
--
QC279800
QC279100
--
--
VD763600
CB821460
21062000
QC830500
QC830700
QC685200
QC829400
QC613000
--
VB563800
QC613000
VB793700
QC790100
QC829100
03744160
--
QC259500
QC259400
QC831200
QC828400
VD763200
--
--
QA209900
--
--
QC828500
QC834700
EQ331250
QC829600
QC828500
QC834700
EQ331250
QC829600
--
QC583200
TX900780
AA805430
--
QC829400
AAX60050
AAX60060
AAX60070
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
総組立
ネックＡｓｓｙ
ネックＡｓｓｙ
ネックＡｓｓｙ
ヘッドパネル
ヘッドパネル
ヘッドパネル
胴本体
糸巻Ａｓｓｙ（左）
糸巻Ａｓｓｙ（右）
糸巻ブッシュ
糸巻スペーサー
＋丸木ネジ
ロッドカバー
＋丸皿木ネジ
上駒
ネックジョイントブッシュ
＋丸皿タッピングネジ
ブリッジＡｓｓｙ
＋丸皿タッピングネジ
弦
エンドピン
＋丸皿タッピングネジ
スペーサー
ツマミＡｓｓｙ
裏カバー（電装部）
＋丸皿タッピングネジ
電装ユニット
可変抵抗器
可変抵抗器
シート
乾電池ボックス
＋丸皿木ネジ
特殊六角ナット
特殊平座金
ストレートジャック
ゴムリング
特殊六角ナット
マイクＡｓｓｙ
マイクカバー
＋丸木ネジ
マイククッション
マイクＡｓｓｙ
マイクカバー
＋丸木ネジ
マイククッション
付属品ユニット
コード
六角レンチ
六角レンチ
乾電池
ブリッジＡｓｓｙ
ブリッジプレート
ブリッジピースＡｓｓｙ
ブリッジピースＡｓｓｙ
部品名
RBX374

RBX374/RBX375
4
Bridge Assembly:
BB185 Black (QC829500)
OVERALL ASSEMBLY
Jack Installation
RBX375
F06
F06a
F06b
B05
B04B03
B01
B02
E01
E08
E03
E02 E03
E04 E05
E04 E05
A01
E13
E15
E14
E16
F02 F03
E18 E19
F06
E17 F04 F05
D01
E10E09
E07E06
G02
G03
G01
E11
E12
E14 E15 E16
A01a
G01a F01b
E17 F04 F05
F01a
E17 F04 F05
F01
F01c
F06a
E17 F04 F05F01c
F06b
G05
G06
G04
G04a
PICKUP BALANCER: A+C 500KΩ
BASS Boost/Cut: B 50KΩ
TREBLE Boost/Cut: B 50KΩ
MASTER VOLUME: B 20KΩ
E11
E01 E02
Tuning Machine Assembly
E03
E04
E02
E03
E04
E01 E05
E05

RBX374/RBX375
5
OVERALL ASSEMBLY RBX375
A01 Neck Assembly RM with Head Panel
A01 Neck Assembly BL with Head Panel
A01 Neck Assembly FSL with Head Panel
A01a Head Panel ABS RM
A01a Head Panel ABS BL
A01a Head Panel ABS FSL
D01 Body
E01 Tuning Machine Assembly RM1243L (Black) Left 2 09
E02 Tuning Machine Assembly RM1243 (Black) Right 3 09
E03 Bushing with Tuning Machine Ass'y 5
E04 Spacer with Tuning Machine Ass'y 5
E05 Round Head Wood Screw 2.4X10 FCM3BL Black 5 01
E06 Rod Cover Black 03
E07 Oval HeadWood Screw 2.4X10 FCM3BL Black
E08 Nut Urea 43mm (Black)
E09 Neck Joint Bushing 1.5X4t (Black) 4
E10 Oval Head Tapping Screw 4.5X40 FCM3BL Black 4
E11 Bridge Assembly BB185 P=18mm Black
E12 Oval Head Tapping Screw 3.5X25 FCM3BL Black 4 01
E13 Strings Nickel Wound 1set
E14 Strap Button ST-type (Black) 2 01
E15 Oval Head Tapping Screw 3.5X25 FCM3BL Black 2 01
E16 Spacer Felt (Black) 2 01
E17 Knob Assembly Metal Dome (Black) VOL.,BALANCER,TREBLE,BASS 402
E18 Back Cover Electrical (Black)
E19 Oval Head Tapping Screw 3.0X12 FCM3BL Black 4 01
F01 Electrical Unit (QC83110)
F01a Variable Resistor 20K ohm B MASTER VOLUME 04
F01b Variable Resistor 500K ohm A+C CC PICKUP BALANCER 05
F01c Circuit Board with BASS,TREBLE Volume
F02 Box for Dry Cell Black
F03 Oval Head Wood Screw 2.4X13 FCM3BL Black 4 03
F04 Hexagonal Nut 8X1.8t with Volume 4
F05 Flat Washer 8X0.6t with Volume 4
F06 Jack Nickel 07
F06a Rubber Ring
F06b Hexagonal Nut
G01 Pickup Assembly Hum-Cancelled FRONT (Black)
G01a Pickup Cover ABS (Black)
G02 Round Head Wood Screw 3.1X25 FCM3BL Black 3 01
G03 Pickup Cushion 11X13 Spring 3
G04 Pickup Assembly Hum-Cancelled REAR (Black)
G04a Pickup Cover ABS (Black)
G05 Round Head Wood Screw 3.1X25 FCM3BL Black 3 01
G06 Pickup Cushion 11X13 Spring 3
H01 Accessory Unit G-1
Cord CABLE(2.5BK) 05
Wrench #1.5 03
Wrench #5 04
H02 Battery 6F22 9V Dry Cell
Bridge Assembly BB185 P=18mm Black
B01 Bridge Plate Zinc 102.5X49
B02 Bridge Piece Assembly 14mm, M3X6, 3.0X13 1 String
B03 Bridge Piece Assembly 14mm, M3X8, 3.0X13 2,3 Strings 2
B04 Bridge Piece Assembly 8mm, M3X8, 3.0X13 4 String
B05 Bridge Piece Assembly 8mm, M3X6, 3.0X13 5 String
: New Parts RANK: Japan only
REF NO.
PART NO. DESCRIPTION REMARKS
QTY RANK
AAX60080
AAX60090
AAX60100
--
--
--
--
QC279800
QC279100
--
--
VD763600
CB821460
21062000
QC830600
QC830700
QC685200
QC829500
QC613000
--
VB563800
QC613000
VB793700
QC790100
QC829100
03744160
--
QC259500
QC259400
QC831200
QC828400
VD763200
--
--
QA209900
--
--
QC828700
QC834800
EQ331250
QC829600
QC828700
QC834800
EQ331250
QC829600
--
QC583200
TX900780
AA805430
--
QC829500
AAX60110
AAX60130
AAX60140
AAX60150
AAX60160
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
総組立
ネックＡｓｓｙ
ネックＡｓｓｙ
ネックＡｓｓｙ
ヘッドパネル
ヘッドパネル
ヘッドパネル
胴本体
糸巻Ａｓｓｙ（左）
糸巻Ａｓｓｙ（右）
糸巻ブッシュ
糸巻スペーサー
＋丸木ネジ
ロッドカバー
＋丸皿木ネジ
上駒
ネックジョイントブッシュ
＋丸皿タッピングネジ
ブリッジＡｓｓｙ
＋丸皿タッピングネジ
弦
エンドピン
＋丸皿タッピングネジ
スペーサー
ツマミＡｓｓｙ
裏カバー（電装部）
＋丸皿タッピングネジ
電装ユニット
可変抵抗器
可変抵抗器
シート
乾電池ボックス
＋丸皿木ネジ
特殊六角ナット
特殊平座金
ストレートジャック
ゴムリング
特殊六角ナット
マイクＡｓｓｙ
マイクカバー
＋丸木ネジ
マイククッション
マイクＡｓｓｙ
マイクカバー
＋丸木ネジ
マイククッション
付属品ユニット
コード
六角レンチ
六角レンチ
乾電池
ブリッジＡｓｓｙ
ブリッジプレート
ブリッジピースＡｓｓｙ
ブリッジピースＡｓｓｙ
ブリッジピースＡｓｓｙ
ブリッジピースＡｓｓｙ
部品名
RBX375

RBX374/RBX375
6
ELECTRICAL PARTS RBX374/RBX375
Circuit Board (QC35460)
Circuit Board (QC35460)
C01 Mylar Capacitor 0.047uF 50V J 01
C02 Ceramic Capacitor 47pF 50V K 01
C04 Electrolytic Capacitor 1uF 50V 7L 01
C05 Mylar Capacitor 0.068uF 50V J 02
C06 Mylar Capacitor 0.068uF 50V J 02
C07 Mylar Capacitor 5600pF 50V J
C08 Electrolytic Capacitor 1uF 50V 7L 01
C09 Mylar Capacitor 2200pF 50V J 01
C10 Electrolytic Capacitor 10uF 16V 7L 01
C11 Electrolytic Capacitor 10uF 16V 7L 01
D1 Diode 1S1555 01
IC1 IC NJM4558D-Y OP AMP 03
JW Wire 4P L=60mm (QC25180)
R1 Carbon Resistor 1M 1/4W 01
R2 Carbon Resistor 150K 1/4W
R3 Jumper Wire
R4 Carbon Resistor 470K 1/4W 01
R5 Carbon Resistor 12K 1/4W 01
R6 Carbon Resistor 27K 1/4W 01
R7 Carbon Resistor 6.8K 1/4W
R8 Carbon Resistor 8.2K 1/4W 01
R9 Carbon Resistor 12K 1/4W 01
R10 Carbon Resistor 3.3K 1/4W
R11 Carbon Resistor 47K 1/4W 01
R12 Carbon Resistor 47K 1/4W 01
VR3 Variable Resistor 16K-B50K L-18KC/CC BASS Boost/Cut 04
VR4 Variable Resistor 16K-B50K L-18KC/CC TREBLE Boost/Cut 04
: New Parts RANK: Japan only
REF NO.
PART NO. DESCRIPTION REMARKS
QTY RANK
QC831200
QC831200
UA154470
FG411470
UI166100
UA154680
UA154680
UA153560
UI166100
UA153220
UI137100
UI137100
IF000040
IG028400
--
VR983600
--
--
VR983200
HF857120
HF857270
--
VR981100
VR981300
--
VR982000
VR982000
QC251700
QC251700
*
*
電気部品
シート
シート
マイラーコン
セラコン
ケミコン
マイラーコン
マイラーコン
マイラーコン
ケミコン
マイラーコン
ケミコン
ケミコン
ダイオード
ＩＣ
４芯フラットケーブル
カーボン抵抗
カーボン抵抗
ジャンパー線
カーボン抵抗
カーボン抵抗
カーボン抵抗
カーボン抵抗
カーボン抵抗
カーボン抵抗
カーボン抵抗
カーボン抵抗
カーボン抵抗
可変抵抗器
可変抵抗器
部品名
ELECTRICAL PARTS
CIRCUIT BOARDS
TREBLE BASS
to BALANCER
to Box for Dry Cell
to MASTER VOLUME
Component side Component side
a
b
c
d
a
b
c
d

RBX374/RBX375
7
CIRCUIT DIAGRAM
acd
dca
bb
FRONT
PICKUP
REAR
PICKUP
BALANCER
TREBLE
BASS
OP AMP OP AMP
MASTER
VOLUME
OUTPUT
JACK
DC9V
Electrolytic Capacitor
Mylar Capacitor
Ceramic Capacitor
BAHH-04

RBX374/RBX375
8
SPECIFICATIONS
WIRING
STANDARD SPECIFICATIONS
Scale Length .............................. 863.6mm
Body-Neck Construction ......... Bolt On
Length
RBX374 .................................... 1111.0mm
RBX375 .................................... 1126.5mm
Width
RBX374 .................................... 327.0mm
RBX375 .................................... 331.0mm
Net Weight
RBX374 .................................... 3.9kg
RBX375 .................................... 4.2kg
COLOR
Body
RM ............................................ Red Metallic
BL ............................................. Black
FSL ........................................... Flat Silver
Neck
RM ............................................ Red Metallic
BL ............................................. Black
FSL ........................................... Flat Silver
BODY
Material ...................................... Alder
Body Depth ............................... 41mm
FRONT PICKUP
<Rear View>
REAR PICKUP
Screw the lug terminal
in the pickup cavity.
to bridge ground
MASTER
VOLUME
B 20KΩ
BLBL
BL
BL
BL
BL
BL
BL
BL
TREBLE
B 50KΩ
OUTPUT JACK
BASS
B 50KΩ
WH
WH
1
2
3
WH
WH
BALANCER
A+C 500KΩ
Battery Compartment
Battery Box
RE
RE
RE
GY
GY
Bare
Bare
FINGERBOARD
Material ...................................... Rosewood
Fingerboard Width
RBX374 .................................... 0-F 40.0mm, 12-F 56.4mm
RBX375 .................................... 0-F 43.0mm, 12-F 65.0mm
No. of Frets ................................ 24
NECK
Material ...................................... Maple
Neck Thickness
RBX374 .................................... 1-F 20.0mm, 12-F 24.4mm
RBX375 .................................... 1-F 21.0mm, 12-F 24.4mm
PARTS
Hardware ................................... Black Plated
Nut.............................................. Urea
Bridge
RBX374 .................................... BB004 (Black)
RBX375 .................................... BB185 (Black)
Strings ........................................ Nickel Wound
CONTROLS
Volume ....................................... B 20KΩx 1
Tone ........................................... B 50KΩx 2
Balancer ..................................... A+C 500KΩ
PICKUPS
Front/Rear ................................ Hum-cancelled (Open type)
Magnet
Front/Rear .............................. Ceramic