Jazz Bass Master Blend — Complete Wiring
WIRING SIDE (back of control plate)
Blend / Volume / Tone · Series/Parallel · Greasebucket
All passive — no battery
CONTROL PLATE — WIRING SIDE (back view, left/right mirrored from player view)
NECK
BRIDGE
BLEND
MN250K dual-gang
GANG A
1
NECK
2
WPR
3
GND
GANG B
4
GND
5
WPR
6
BRIDGE
VOLUME
CTS 250K push-pull DPDT
1
GND
2
WPR
3
IN
TONE
CTS 250K audio
1
CCW
2
OUT
3
IN
DPDT SWITCH
(on volume pot shaft)
POLE 1
POLE 2
1
GND
2
NCK GND
3
BRG HOT
4
NC
5
220k
6
VOL WPR
220kΩ
load pad
22nF
4.7kΩ
100nF
WIMA MKS2
OUTPUT
Switchcraft mono jack
T
TIP
S
SLV
JCT X
wipers join
GROUND BUS — all pot casings
A3→GND
B4→GND
V1→GND
NECK HOT
BRG HOT
A2 wpr
B5 wpr
JCT X → Vol Lug 3
Vol wpr → Tone Lug 3
Tone wpr → Jack TIP
Jack SLV → GND bus
T1 → 22nF → 4.7k → GND
L1↔L2
SW1 → GND bus
NECK GND
SW3 → bridge hot tee
SW5 → 220k → GND
SW6 → Vol wpr (L2)
BRG GND
⚠ GREASEBUCKET WARNING
Tone Lug 1 → 22nF → 4.7kΩ → GND
NOT direct to ground!
DPDT PUSH-PULL MODES
PUSH (down) = Parallel (standard)
PULL (up) = Series + 220kΩ load pad
SW1↔SW2, SW4↔SW5 (push) | SW2↔SW3, SW5↔SW6 (pull)
PICKUP → BLEND → JCT X → VOL Lug 3 → VOL Wiper → TONE Lug 3 → TONE Wiper → JACK TIP
GREASEBUCKET CIRCUIT
22nF + 4.7kΩ series: Lug 1 → GND
100nF (WIMA): bridges Lug 1 ↔ Lug 2
Prevents bass buildup at low tone settings
Ground bus (pot casings)
Ground connections
Signal path (blend→vol→tone)
Pickup hot leads (dashed)
DPDT switch connections
Greasebucket (22nF, 4.7kΩ, 100nF)
Output (tone wiper → jack)
Wiper lugs