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Friday 8 September 2023

Ballast Cleaning Train - Part 11

Fitting a Zero 1 chip to the T9 Locomotive

I use the Hornby Zero 1 system to control trains. It is an early type of DCC (1980s). If all you want is simple track wiring and the ability to operate multiple locos at the same time then there is no cheaper option. Parts are available from the after market. The down side is that the chip is big and will not fit some modern model locomotives.

We need to open the Tender to fit the chip. My T9 has a six wheeled tender. There is also a 4 wheel variant. These instructions may not be suitable for that one.

  1. Disconnect the loco plug from the tender socket and remove the tender from the loco. Remove the two screws that are located near the chassis sides between the two rear sets of wheels and lift the body from the rear to release it from the tag holding it at the front
  2. Remove the three weights (we need the space!). I found removing weights does not not affect performance

3. Position the chip on top of the pickup strips. When reassembling it may be necessary to  adjust its position to achieve fit of body to chassis

4. Note the position of pin 1 marked on the plugin and remove the plugin; then mark pin 1 on the 8 way socket board. Set aside the plugin. It must not be used for this procedure.
5. Take a piece of solid wire about same thickness as the pins on the plugin. Form a 'U' and insert it in positions 1 and 8. Solder the chip black wire to this. 
6. Strip and tin the red and green wires. Poke the green wire into position 4.
7. Solder the capacitor that came with the chip to the 'U' loop of wire and poke the other end into position 5 (not shown in photo)
8. Solder the red wire to this capacitor leg (position 5). Ensure the capacitor legs do not touch other positions. If necessary, insulate the legs with the sleeve stripped from other wire
9. Reconnect the loco white plug to the tender white socket and test loco operation.
10. Refit the tender body locating the front tag first.

The loco crew were taken from an old Airfix Permanent Way Figure set. There is not a lot of room in the cab, certainly they cannot stand side by side. The lack of space is due to the boxes set against each cab side wall. These are wider than the prototype because they have to accommodate the 00 gauge rear driving wheels, which are set closer together than the prototype.

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