Chrissaf Posted August 22, 2018 Share Posted August 22, 2018 I am trying to resurrect this model which has been broken for over ten years Can anyone give me details on how to fit a decoder and alsp a wiring diagram asI only have two wires attached btro the motor Link to comment Share on other sites More sharing options...
Chrissaf Posted August 22, 2018 Share Posted August 22, 2018 The R3082 should (according to the Service Sheet quoted in the previous thread linked below - assuming that info is correct) be DCC Ready, so it should have a DCC Decoder socket inside it that will currently have a blanking plug PCB (Printed Circuit Board) plugged into it. Remove the body and replace the plug in blanking plug with any 8 pin DCC decoder. Make sure to align PIN 1 of the socket with the orange wire on the decoder. A DCC Ready loco brings all the wiring (except the purple wire) back to the socket, to make the fitting of the decoder easier..Quote: I only have two wires attached to the motorIt is normal to only have two wires attached to the motor. The wiring in principal goes wheel pickups to socket, socket to motor, plus, if applicable, socket to lights (usually lights are only on Diesels and Electric locos and not steamers)..Thus with the decoder fitted, the wiring goes; wheel pickups to socket, socket connects to the decoder DCC input, the decoder motor output goes back to the socket, socket to motor. Light wiring (if applicable) would go from decoder to the socket, socket to lights. As you can see, the socket is located at the centre of the wiring web and handles all the necessary wiring cross-connections. The function of the socket blanking plug PCB is to make the essential wiring cross-connections required when the decoder is not fitted so that the loco still functions under DC Analogue control..However.The question has been asked before and replied to in this previous Hornby forum thread:https://www.hornby.com/us-en/forum/hornby-r3082-hogwarts-express-how-to-open-to-fit-dcc-chip/?p=1.This Info taken from linked post above - You also need to download Hornby Service Sheet 306C from this Hornby web site page:https://www.hornby.com/us-en/downloads/view/index/cat/23/.This Info taken from linked post above - The Maintenance sheet for the Hogwarts Castle Class from this Hornby site page:https://www.hornby.com/uk-en/downloads/view/index/cat/16/?p=3.Alternatively.If your Hogwarts model is definitely not DCC Ready and does not have a socket, then this link will provide you with a basic wiring diagram for a Hornby R8249 8 Pin decoder. That you can adapt for your model. Note that the decoder wire colours and function will be the same on any brand 4 function 8 Pin DCC decoder that you purchase.https://www.hornby.com/uk-en/forum/post/view/topic_id/23590/?p=2.You also wrote:I am trying to resurrect this model which has been broken for over ten years..Do please consider this though. Before converting to DCC by fitting a decoder. You MUST undertake any repairs required to make it a good runner under DC Analogue control first. Converting to DCC will show up any existing running issues and magnify them, it won't fix them. DCC is far more sensitive to loco electrical working condition than DC. Link to comment Share on other sites More sharing options...
Fishmanoz Posted August 22, 2018 Share Posted August 22, 2018 Something to note here - there are 2 very different Hogwarts locos which were released relating to I think 3 of the books/movies. Easy to tell the difference from the outside - one has a light in the smoke box door, the other doesn’t. The one without the the light is not DCC ready so needs the decoder to be hard wired as per the reference from Chris above. It has a Ringfield motor of the simple conversion type (no connection between LH motor brush holder and chassis). The one with the light is DCC ready with a socket and a 5-pole can motor. Just remove the blanking plug from the socket and insert the decoder and you are done. The light is powered separately via its own circuit board and works on either DC or DCC. On DCC it will be on all the time. Link to comment Share on other sites More sharing options...
96RAF Posted August 23, 2018 Share Posted August 23, 2018 Please note that the drawbar shown in SS306 is different from the usual powered drawbar and it only seems to pickup power from one side of the tender. Rob Link to comment Share on other sites More sharing options...
Spireblade Posted August 23, 2018 Share Posted August 23, 2018 FishmanOz.I'm glad this topic has resurfaced. I have the DCC ready version with smokebox light. I have fitted a decoder. Is there any way of making the light switchable by DCC? As you say, it's always on and annoying if not using that loco. Link to comment Share on other sites More sharing options...
Chrissaf Posted August 23, 2018 Share Posted August 23, 2018 Yes, wire it to Pin 3 (Green wire) & the blue wire of the decoder (see diagram in the linked post below). Then use the Function Key appropriate to your decoder to switch it on and off. If using a Hornby R8249 decoder this would be F1. The green wire is switched negative and the blue wire is permanently positive..This previous post was published in response to the exact same question relating to Hogwarts Express front lamp (converted, if not already, to LED).https://www.hornby.com/uk-en/forum/post/view/topic_id/23590/?p=2.Spireblade, this link was also published in my posted reply at the top of this page. Link to comment Share on other sites More sharing options...
Fishmanoz Posted August 23, 2018 Share Posted August 23, 2018 So looking at Chris’s excellent diagram and explanation, you can use the switched green wire plus blue common positive for the job and you can remove the existing circuit board. The light is an LED too. Link to comment Share on other sites More sharing options...
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