How to convert N Gauge Dapol Class 122 to DCC Sound

This guide covers the Dapol Class 122 models with the Next18 DCC socket, for example:

• Dapol Class 122 E55012 in BR Green with whiskers (2D-015-004)
• Dapol Class 122 M55004 in BR Blue/Grey (2D-015-005)
• Dapol Class 122 M55006 in BR Blue (2D-015-006)

It may also be suitable for other similar models, such as the older version with 6-pin decoder sockets.

Step 1 - Prepare Decoder

The decoder used in this conversion is a Zimo MS450. First, solder the stayalive PCB wires to the decoder. Solder two further wires from the stayalive PCB to the capacitors.

Here, two capacitors are connected in series to provide a little extra power.

Step 2 - Fit Speaker

Fit the speaker between two rows of seats, and hold in place with glue or black tack. Solder two brown wires between the speaker terminals and the speaker solder pads on the Next18 socket PCB.

Step 3 - Fit Stayalive

Fix the stayalive PCB and capacitors to the underside of the roof, using glue or black tack.

Step 4 - Fit Decoder

Fit the decoder into the Next18 socket. Clip the body back on, and the conversion is complete.