robertwm3110

Further to last email am pleased to say it works! Wiring to FA1 enables on/off control of the light (for the cab) via F6 on the cab unit. Always helps when you read the instructions!!

Thanks again for various comments. Just to be clear, this is a MX644D. The reference to wires is based on the fact that the chip is plugged in to a small 21 pin to wire adapter. These (acquired off ebay for a few quid and very good ) are small adapters on which the chip sits ( i.e. male adapter, female receiver on the chip.) The advantage is that they have 21 slightly larger soldering pads which makes wiring a lot easier and if you screw up the soldering you ruin the adapter on not the chip! This is a DJH LOCO with no previous wiring so its all new from the lights etc. Thanks your advice Nigel, but I have now found the paperwork and its a Youchoos chip....that indicates that AUX3/FA1 is the connection for the light, with F6 on the cab unit to control it. So will try that, but if it doesnt work I’ll be back. But I would still like to be able to know how to remap the function outputs to the cab unit function keys.

Thanks to both. Not familiar with decoder pro but just googled it, thanks. On the other point, Suzie, if I connect to FI then how is this mapped to the cab unit (NCE procab). Which key is going to make it work?

Hi, I am fitting a spare MX644 Zimo chip in a DJH class 14. Sorted out the forward/reverse lighting but how do I get a cab light to work. There are half a dozen Function connections going spare, but which do I connect to. Obviously positive (blue) to the common positive but where does the other go. I randomly tried F3 but no joy. Is this a CV setting issue. I want the cab light separate from the direction lights.

Hi, when I set up a macro for point control I cant get the Procab to throw more than 2 point motors. I am using Cobalt IP motors. Is this a power issue, do I need to add capacitors in to the system.

Converting Heljan 40 0 gauge to DCC using Zimo699 chip. Can you reuse the lighting for front and tail lights as supplied on the printed circuit boards. The wiring seems unusual (like most Heljan wiring) and presume its paired white forward/red rear, changing as direction is selected. If you can use it can somebody confirm that R1-R5 are resistors and those will avoid using separate resistors on the positive feed from the chip.

Nigel, hi, did you ever get replies to this. View the timescale I assume this got sorted. I have the same question. Am normally ok on DCC wiring but not wired a Heljan model with the printed circuit board lights. The way the loco is wired suggests the forward white and rear red lights are paired, and alternate according to direction. Can you leave like that or is it a new start. Anyway, any comments appreciated. If its easier and as this is now so old reply direct to me on robertwm310@hotmail.com thanks

Ok thanks, i had been told to remove other locos so thanks for that.

Hi, has anybody had issues programming the larger Zimo 696 chips. I have 3 fitted to 3 Heljan 0 gauge locos but am unable to programme the chips using a dedicated programme track and the “USE PROGRAMME TRACK” option on my NCE procab system. Any attempts to do so bring up a “ CAN NOT READ “ error message. I can however programme by using “PROGRAMME ON MAIN” which gets round this but means moving all other locos off the main. One retailer has told me it could be the capacitor that is taking power away from the programme track. Is this possible, anybody else had this issue??

Thanks your comments

Hello, i am looking to fit loco lighting (cab and/or front/rear) to a few locos recently converted to DCC . Mostly Zimo chips. This includes a couple of Bacchman brass shunters and DJH class 03/14. What or whose lighting is recommended...LED???? Am ok on the wiring to the chips, just not sure or what lighting to use. Presume voltage would need some form of resistors??? (Please correct if necessary, my dad was the electrics man and it didnt pass down!)

Thanks for both replies, and hopefully on the market soon.

Hi, does anybody produce the correct style of numerals for the 05 shunter in the late BR green version. The Heljan version is the later larger window loco and these all seemed to have a larger style of number, certainly different in size and font to the more common pre TOPS versions that are available from a few manufacturers. Thanks.

Thanks for that. I’ll probably rewire the frog feeds from the track bus and use 4 5 6 as suggested . It does work using the accessory bus, or rather it works on the other 7 point motors. I had considered when I did this if it was the right thing, but electrics arent my strongest point. once again thanks for taking the time to help

Thanks again your comments. Yes its the Cobalt IP digital. I have looked at the wiring and it seems ok. I did swap the power supply leads from the bus and that just gave me a short on the frog, which is what it should have done. i tried reprogrammimg using input 197 as I originally did when the motors were new. This hasnt solved it. I did post this as a separate question and somebody suggested it could be a contact failure in the motor, also suggesting using the other switch on the motor, with power in from the track bus. Think thats contacts 4 5 and 6 on the Cobalt???