Westone Spectrum Series II SPB311 bass wiring

This is the wiring diagram for my SPB311. I presume it is a 1988 model as it has 24 frets and a beveled 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.