Page 1
ELECTRIC BASS
RBX760A
SERVICE MANUAL
011424
EG
19980708-330000
CONTENTS
OVERALL ASSEMBLY ............................................... 2
PARTS LIST .................................................... 3
CIRCUIT BOARDS ........................................... 4
IC BLOCK DIAGRAM ....................................... 4
CIRCUIT DIAGRAM .................................................... 5
WIRING ....................................................................... 5
SPECIFICATIONS .................................................... 6
HAMAMATSU, JAPAN
0.9K-09 Printed in Japan ’98.10
Page 2
RBX760A
OVERALL ASSEMBLY
E18
Bridge Assembly Diecast : GOLD (QC347800)
B02
A01b
A seal is attached
on the rear of the neck.
RBX760A
E04E01
B01
B03
E10
E04E02
E21
A01
E27E26E25
D01
E12E11
F07F06
E09E08
E33E31
G04G03G01
E09E08G06
E19E18
E29
F01b
VOLUME : B 20kΩ
F01
F17
E29
F01c
BALANCE : A+C 500kΩ
F01a
E29
BASS : B 50kΩ
F11a
E29
F01a
2
TREBLE : B 50kΩ
Page 3
RBX760A
PARTS LIST
REF NO.
PART NO. DESCRIPTION REMARKS
A01 Neck Assembly TLR 31
DX808950
A01 Neck Assembly TLG 31
DX808960
A01 Neck Assembly TLB 31
DX808970
A01b Seal (QC45980)
OVERALL ASSEMBL Y RBX760AII
--
QTY RANK
D01 Body
E01 Tuning Machine Assembly RM1243 (GOLD) 2 09
E02 Tuning Machine Assembly RM1243L (GOLD) 2 09
E04 Round Head Wood Screw 2.4X10 GOLD 4
*
E08 Rod Cover BL 03
*
E09 Oval Head Wood Screw 2.1X10 FCM3BL
E10 Nut 40mm Ivory 07
E11 Neck Joint Bushing BL 404
E12 Oval Head Tapping Screw 5.0X40 FCM3BL 4 01
E18 Bridge Assembly GOLD Diecast 11
E19 Oval Head Tapping Screw 3.0X25 GOLD 4 02
E21 Strings H4030 1set (AA80931)
E25 Strap Button ST type (GOLD) 2 02
E26 Oval Head Tapping Screw 3.0X25 GOLD 2 02
E27 Spacer Felt BL 201
E29 Knob GOLD 406
E31 Back Cover Electrical (BL) 05
E33 Oval Head Wood Screw 2.7X13 FCM3BL 4 03
F01 Electrical Unit (QC35480)
F01a Circuit Board Assembly 09
F01b Variable Resistor B20K ohm VOLUME 04
F01c Variable Resistor A+C 500K ohm CC BALANCE 05
F06 Box for Dry Cell 04
F07 Pan Head Tapping Screw 3.0X8 FCM3BL 2
F11a Jack 07
F17 Round Head Wood Screw 2.7X13 FCM3BL For the earth lug installation 2 03
*
G01 Pickup Assembly Front
G03 Round Head Wood Screw 2.6X35 FCM3BL 3 02
G04 Pickup Cushion 85LX17WX15H 02
*
G06 Pickup Assembly Rear
G08 Round Head Wood Screw 2.6X35 FCM3BL 3 02
G09 Pickup Cushion 85LX17WX15H 02
--
QC336300
QC336400
03704070
CB821460
03706220
CB821090
QC205200
VI825000
QC347800
EN230130
-BB802460
EN230130
VB793700
QC032200
VD955600
EB620020
-QC354700
QC259500
QC259400
QA223300
QC025000
QA209900
EA620060
QC460500
VJ388800
CB815450
QC460600
VJ388800
CB815450
QC354700
IC1 IC NJM4558D-Y OP AMP 03
IG028400
D1 Diode 1S1555 01
IF000040
VR3,4 Variable Resistor B50K ohm CC TREBLE,BASS 2 04
QC251700
H01 Accessory Unit (G-1) 1set 07
QC354000
QC347800
B01 Bridge Base GOLD 07
QC348000
B02 Bridge Piece Assembly 1,2 (GOLD) 1,2 2 05
NX818360
B03 Bridge Piece Assembly 3,4 (GOLD) 3,4 2 05
NX818370
: New Parts RANK : Japan only
Circuit Board Assembly 09
Bridge Assembly GOLD Diecast 11
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 COMPONENTS IN YOUR 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.
3
Page 4
RBX760A
CIRCUIT BOARDS
TREBLE BASS
Component side Component side
IC BLOCK DIAGRAM
NJM4558D-Y (IG028400)
Dual Operational Amplifier
to Volume
to Battery
to Balance
Output A +V
Inverting
Input A
Non-Inverting
Input A
-DC Voltage Supply
1
2
3
4-V
+-
+-
8
7
6
5
+DC Voltage
Supply
Output B
Inverting
Input B
Non-Inverting
Input B
4
Page 5
CIRCUIT DIAGRAM
FRONT PICKUP
BALANCE
A+C 500k
REAR PICKUP
Electrolytic capacitor
Mylay capacitor
Ceramic capacitor
BASS
TREBLE
RBX760A
Battery
DC 9V
OUTPUT
JACK
VOLUME
WIRING
to front pickup cavity
Box for dry cell
FRONT PICKUP REAR PICKUP
BL
GY
VOLUME
B20K
RE
BASS
B50K
RE
BL
BL
BL
RE
WH
BALANCE
A+C 500K
WH
WH
to rear pickup cavity
to bridge ground
BL
TREBLE
B50K
WH
OUTPUT
5
Page 6
RBX760A
SPECIFICATIONS
STANDARD SPECIFICATIONS
Scale Length..............................863.6mm
Body-Neck Construction .........Bolt On
Length........................................ 1100.0mm
Width .........................................327.0mm
Net Weight ................................3.9kg
COLOR
Body
TLR......................................... Translucent Red
TLG ........................................ Translucent Green
TLB ........................................ Translucent Blue
Neck
TLR......................................... Translucent Red
TLG ........................................ Translucent Green
TLB ........................................ Translucent Blue
BODY
Material......................................Alder, Ash veneer
Body Depth ...............................41.0mm
FINGERBOARD
Material......................................Rosewood
Fingerboard Width ................... 0-F 40.0 mm, 12-F 56.4 mm
No. of Frets................................24
NECK
Material......................................Maple
Neck Thickness ........................1-F 21.0 mm, 12-F 24.4 mm
PARTS
Hardware ................................... Gold Plated
Nut..............................................Urea
Bridge ........................................Diecast : Gold
Strings........................................ YAMAHA H4030
CONTROLS
Volume .......................................B20k ohm x 1
Tone ...........................................B50k ohm x 2
Balance ...................................... A+C 500k ohm x 1
PICKUPS
Front/Rear ................................ Double Coil
Magnet
Front/Rear ................................ Ferrite
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