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Hornby TTS Class 66 problem


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Hi guys,

 

looking for some help, I decided to give the Hornby TTS sound decoder a go for me Bachmann Class 66. The loco runs fine on DCC. I fitted the new decoder with the speaker already attached, programmed the new one on the service track and all went well. Was impressed with the sound for the price.

 

problem now is I get no more sound, the loco runs on the rolling road and all the lights work, I have checked the wires and nothing has come away including the speaker. Not even a crackle now.

 

Could I have some how blow, broken the speaker ? I assume the chip is fine as the lights and wheels work. I have used a 8-21 converter by Bachmann.

 

I dont want to replace the speaker just yet if there is another way of finding the fault ? 

 

Really disappointed, didn't even get chance to put the shell back on :(

 

Many thanks.

 

Leon

 

 

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Hi Leon

Silly question I know but it's always best to rule them out first

Could you have accidentally turned the sound off ?

I normally find with me that faults are due to PICNIC...problem in chair not in computer.

Are you able to try it in another locomotive ?

Have you tried a chip reset to default values ?

 

Chris

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Hi Chris, 

 

 

Thanks for the reply, 

 

When you say sound off, the switch under the loco is still on, is that sound or lights ? Other than that i don't think so, I've been toggling the F1 on and off which is the sound as on my other loco's. (Is there another way ?)

 

I will look now and try another loco.

 

Not sure if related but a few weeks ago a more expensive chip stopped working in a Bachmann class 37 of mine which had been fine for sometime. That was when on the layout not a service track.

 

The chip had been in the class 66 no more than five min and worked great the 1st time i recorded a video.

 

I will read the instructions also to see about a reset.

 

Im using Bachmann Dynamis.

 

Been building  my layout South Wales Freight a good few years now but still pretty new to DCC sound and electrics.  Really looking to concentrate on fitting my ten plus fleet all with sound now.

 

Many thanks

 

 

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Hi Leon I meant F1. The switch will be light related.

RAF96 has just put a good post above regards resetting cv's.

Might also be worth checking the adaptor is snugly in place. 

Chris

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6 minutes ago, RAF96 said:

Writing value 5 to CV8 will reset just the sound side to avoid messing up any motor side settings you have made.

Rob

Hi Rob.

 

Thanks, I just tried that. i looked like it was set to 0 so i set it to 5 but still no joy. The decoder did seem to make a quiet nudge sort of noise then pressing the F1 sound on.

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Contact Hornby Tech by phone and explain the issue to them.

I had a problem with a steam loco TTS recently and after speaking to Hornby I obtained a replacement via the supplier and all is well now.

My original problem is described here:

Eight of my loco's are fitted with TTS decoders and they all perform well, I would not hesitate to fit further TTS decoders.

 

Bill.

 

Edited by Bill37
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Thanks Bill.

 

I was going to call them today.  I was happy with the price and sound so was disappointed on my first one, but after what you have said about them I will give them another go.

 

Many thanks

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Hi

 

When you installed the decoder, did you insulate it, TTS decoders get hot under normal use and don't like being wrapped in tape to insulate them, they will blow the sound section very quickly if wrapped in tape or heat shrink.  With my first one I used a bit of loose fitting un-shrunk heat shrink, when I had a look after it failed the heat shrink had shrunk, it had got that hot.

 

Also one other bit of advice I was given is install a resistor in the blue wire as the lighting circuit has quite a low amperage and can also be blown by too many lights being attached and the Bachmann 66 has quite a few lights.

 

I think I just stuck in a 1k resistor.

 

Paul

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I have one in a Bachmann class 66 and I haven't had any issues. if you have another 8 ohm speaker to hand it might be worth swapping it over to eliminate the speaker. But if not I'd just send it back to where you bought it and I'd expect it to be covered under warranty. Just a few things to consider, if you put it in as it is, uninsulated it could have shorted out on something, If you over insulated it as Paul said that could have also caused an issue.

 

Richard

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23 hours ago, paftrain said:

I know this won’t help you, but I am interested to find out if you resolve your problem as I have purchased the Hornby 66 TTS chip to fit in my Bachmann/NRM model.

 

Hi Paul, 

 

Will keep you updated. 

 

 

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Hi all,

 

Many thanks for taking the time to reply, apologies for posting I know there  are a lot of TTS forums on here.

 

Paul firstly, no I never fitted the speaker into the loco just had it on a rolling road and placed next to it. Straight to Richard, as it was not fixed in place I'm thinking you could be right and something touched ? Like I say everything else works though and the speaker does grumble.

 

I called Hornby today, they said call Rails, if they don't replace they will except it back, Rails instantly mailed me a return slip straight away. I will be a bit more careful with the replacement and let you know how it goes. 

 

I did have a spare speaker but not sure on the ohms, as I read TTS needs to be a least 8.

 

Richard - I have a class 37 that's playing up, was thinking you could have a look and maybe add a more meaty speaker ? Am I right in thinking that's what you do ?

 

Many thanks again guy, really appreciate the help...

 

 

4 sound fitted, still about 7 to do....

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3 hours ago, Leon said:

 

Richard - I have a class 37 that's playing up, was thinking you could have a look and maybe add a more meaty speaker ? Am I right in thinking that's what you do ?

 

Hi Leon, yeah thats what I do! send me a message if you want and we can sort something out.

 

Thanks

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Handling a live decoder is not a good idea. If you were pressing the embedded sound chip to make ot work then that sounds like a duff decoder. Bridging the speaker connections on the decoder will make a different noise as your skin oils act as a current path and voltage divider across the speaker.

 

0 as a volume setting is OFF but how it got at value is probably one of life’s little mysteries. 

 

Even though the main sound is on or off at F1 all the other sounds F2 through to F24  should work and would prove the speaker connection/quality of sound. F25 is an aux power output that could be used for a cab light, etc.

 

I advise an additional (1K ohm) resistor in the blue wire feeding the lights to keep the current within TTS limits as the functions outputs are not self protecting like the motor circuit. It will also drop the brightness some and you may need an even bigger value if they are still too bright. I could use my Class 40 headlights as a torch.

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My replacement TTS decoder should arrive over the next few days,  Any advice, Did I do something wrong last time ?

 

I fitted the decoder but left the bodyshell off with the speaker hanging down by the side of the loco on a rolling road, could something have touched and damaged it ?

 

I am thinking do I need to fit/tape everything in place before I start it up ?

 

Many thanks

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Never handle a powered decoder. Only ever handle a decoder by the edges. Always insulate either the decoder or the loco and never let a decoder touch metal on the loco or elsewhere.

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  • 1 year later...
54 minutes ago, Jack97m said:

I was just wondering, does the 8 pin to 21 pin adapter fit straight under the body with the TTS chip fitted or do you need to modify the inside of the body. Thanks 

They go straight in but be careful how you position the wires, its easy to trap them when you put the body on

 

Richard

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10 hours ago, Richard Croft said:

They go straight in but be careful how you position the wires, its easy to trap them when you put the body on

 

Richard

Thanks rich, do you recommend a better speaker to go with it or are the standard ones alright. 
 

 

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Please help

 

I too have a tts 66 issue. I have  bought the Hornby Tom Moore the loco was run in on dcc and performed well so I fitted it with a TTS chip it ran ok but it juddered on certain parts of my layout. I have since replaced the speaker with one from west wagon works, still a judder, i fitted lights using the illumination models kit and I have attached a stay alive to the tts decoder using strathpeffer junctions YouTube video as a guide. To try to cure the judder but it hasn’t helped. I have also removed the capacitor from the motor bogie. the stay alive works well I know because if you lift it off the track whilst moving the wheels still turn and the lights are illuminated. However today I noticed that the model judders on the parts of track that have droppers on them. This is really strange to me. The wheels are clean the track is clean, I am at a loss. I have been trying to adjust the CV,s but I don’t know what I’m doing and there are loads of posts on various forums with conflicting advice. As I said please help. My controller is the elite, and my short circuits are aided the old fashioned way with a car headlight bulb.

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