We’ve written this guide to help customers diagnose and fix problems that may occur with the Pro-150. We don’t release complete circuit diagrams for current models but we hope this guide will shed some light Read More

If a Pro-150 gives the Pt [pot top] fault code, or just gives a continuous rapid beeps, this indicates a pot or wiring fault or blown F1 fuse track such that the voltage on the Read More

Pro-150 mechanical information Dimensions Board only: 145mm x 102mm x 38mm With base and cover: 181mm x 121mm x 46mm Weight Board only: 320 gm Complete: 630gm Power connectors 9.5mm push-on for battery, combined with Read More

This modification should be applied to all Pro-150 controllers with serial numbers 0198 or higher and lower than 0550. On 0550 and later controllers the capacitor is not fitted. On serial numbers 0198 and lower Read More

The circuit of the Pro-150 is available as a pdf. Current limit amplifier is in the bottom right corner. Current is monitored by sensing the voltage drop across the lowside MOSFETs when they are conducting. Read More

These notes are by serial number, rather than by date. The list is mainly for 4QD internal reference so is somewhat technical. 0000 to 0105 Are Mark 1. In these, there was no 12v connection Read More

This page describes how to use the “pot learn” feature of the Pro-150 to set up joystick programming, [or wig-wag operation]. Before starting this sequence the Pro-150 should have power connected to B+ and B-, Read More