Fitting a sound decoder to DCC-fitted (NOT the DCC-ready) Pendolino

[e.linker99]

I've acquired a Hornby R1076 Pendolino DCC-fitted set (unfortunately, NOT the "DCC-Ready" loco). I want to replace the Hornby-fitted decoder in the driving loco with a sound chip, but I'm hesitating...

The Hornby-fitted decoder (forum research indicates it might be an old-style R8215, no coloured dot) employs a 7-pin socket which plugs in to a 7-pin PCB on the loco. The connections on the loco's PCB are numbered J2 through J8, with the following colour of wires  running to the decoder:

PCB    Decoder Wire

J2    BLACK
J3    GREY
J4    YELLOW
J5    WHITE
J6    BLUE
J7    ORANGE
J8    RED

So, if those decoder wire connections are to NRMA standards, I believe I should plumb in an 8-bit socket to the loco's PCB like this:

PCB    Decoder Wire    NEM 652 socket

J2    BLACK        Pin 4        
J3    GREY        Pin 5
J4    YELLOW        Pin 2
J5    WHITE        Pin 6
J6    BLUE        Pin 7
J7    ORANGE        Pin 1
J8    RED        Pin 8        

Has anybody tried connecting an 8-pin decoder to the Pendolino 7-pin PCB (via an 8-pin trailing socket)?

Your advice, criticism, and even pithy comments appreciated, before I cut off that Hornby decoder from its 7-pin plug and recycle it [grins]...

Thanks!

Colin

[Chrissaf]

Those pin-outs look correct. They match with this drawing that you might find useful as part of your modification.

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/media/tinymce_upload/3c9cefd175aa3c8bc7fce9fece35e457.jpg

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[e.linker99]

Thanks, Chrissaf, I'm encouraged ... about to wield the knife and the soldering iron NOW!

Cheers

Colin