This is the wiring diagram for my SPB311. I presume it is a 1988 model as it has 24 frets and a bevelled heel. The switches are DPDT (Active
on/off) and 4PDT (Dual tone switch), the pickup selector switch is a
standard SPDT (On/on/on) switch. The volume pot is 500k log, both
the active and passive tone pots are 500k linear. The tone capacitor is
0.047 microfarad Mylar.
Pickups -
Neck - Magnabass IV , 6.45k per coil
Bridge - Magnabass V , 6.59k per coil
The IC (GL358 dual operational
amplifier) on the PCB is an obsolete part and may be hard or costly to
obtain - if it needs replaced, an LM358 may be used instead.
Notes -
Only these wires are shown in the same colour as they are on the guitar :
wires from the pickups
screened leads
earth wire to bridge
positive lead to battery box
the dark blue wires to the pickup switch, volume control and active circuit PCB
I have used different colours for all the other wires to make the diagram readable - on the guitar, they are all dark blue.
