A Maintenance Record
Mallard, Scotsman, etc
Fowler 2F and Ivatt 2MT
The 2-10-0 Workhorses
Solid, Robust, Reliable
Not Minitrix & Non Uk
On Minitrix Models
Classic UK Minitrix Models - DCC Conversion 2
Above the Worm Gear
Much of the logic behind the DCC conversion is covered in the boiler conversion, so I am just going to write a summary here, with an explanation of the photos that I have taken.
The tender provides a +ve pickup via the black lead from the front and rear right hand side wheels. There is also a -ve connection through the draw bar. I have never found this to be particularly reliable and with DCC I prefer to provide an extra lead for the -ve pickups from the tender to the loco. With the boiler weight removed, the tab which presses against the underside of the weight, provides an ideal solder point.
Remove the circuit board - de-solder the wires which connect to it and the ends of the two long arms which rise vertically from the pickup tracks. Unscrew the board.
The motor needs to be isolated from the chassis. The lower bush cap has a tag on it to connect with the chassis. Switch the two caps over so that the tab is on the top of the motor - but not until you have made the necessary soldered joints - later.
There are two tabs on the pickup tracks slightly behind the middle axle. These can be used to solder a black (left) and a red (right) lead to turn to the tender in place of the existing black lead. There are two holes at the rear of the cab which will easily accommodate the wire on each side. Put a small blob of solder on the tab first. Keep contact with the soldering iron to a minimum - a second should be ample - you don't want to melt the plastic base of the pickup strip.
Use adhesive pads, or double sided stick tape to fit the chip. Check the body fits on top before doing anything else. Tuck the ends of the legs under the pad.
Tin the vertical connectors from the pickup tracks - about midway up their length. Plan the wiring. Solder the black and red cip leads to the vertical strip from the pickup track. Solder the orange and grey leads to the motor bush caps - when they are off the motor.
The white lead for the forward light can be left long for now.
In the boiler
Above the Worm Gear
Maintaining Classic UK Minitrix Locos