Mike-Greg Posted January 23, 2018 Share Posted January 23, 2018 Hi I have this loco since it first came out, and it always worked fine due to house move , the layout was dismantled and stowed in the garage at the new house due to lack of space all the locos/rolling stock packed in their boxes ans stowed in the spare garage been like this now for last 3 years have just made a small shunting layout 6 feet by 20 inches, so unpacked a couple of locos to run on it class 80, class 24, class 20 all sound fitted but the class 20 will not run ?? completely dead no sound and no movement opened it up, can see no broken wires or any other visual fault removed the decoder and fitted the blanking plate to try on analog track,, nothing looked on the web for the decoder pins/connections but the colors shown do not conform with the way the loco is wired and i cant see how to remove the motor to check it out away from loco,,, in fact i can only see one wire going to the motor its black and goes to the top of the motor pickups are clean and get a reading with meter from wheels to decoder plug , so its not contacts ? was going to check motor with 9v batt but cant see 2nd motor connector ?? so at moment unsure if the decoder is dead or the motor is dead ?? any help would be appreciated rgds Mike Link to post Share on other sites More sharing options...
Nigelcliffe Posted January 23, 2018 Share Posted January 23, 2018 Multimeter time. (A more-than adequate for model railways multimeter is under £15 at Maplin, who are rarely the cheapest source of things). With no decoder and no blanking plate: Check continuity from rails, via wheels and pickups, to the "track" connections on the decoder socket. Check continuity from decoder socket to motor. Check resistance of motor. With blanking plate: Check continuity from rails to motor brush contacts. You can ignore the wire colours if the maker has just used random wire. What matters is the pins on the decoder socket, those have to match the standard or the loco can never work with a decoder. Link to post Share on other sites More sharing options...
Mike-Greg Posted January 23, 2018 Author Share Posted January 23, 2018 Hi Thats quick i have a multi meter i have checked wheels to decoder socket and frack to decoder socket and it is ok checked from decoder socket to motor (1 anyway ) cant see the 2nd motor connection? how do i check motor resistance ? Mike Link to post Share on other sites More sharing options...
Mike-Greg Posted January 23, 2018 Author Share Posted January 23, 2018 Hi So its not the motor , connected a 9v batt across contacts and motor spins so that leaves (a) the decoder (b) the decoder socket 21 pin type Mike Link to post Share on other sites More sharing options...
Mike-Greg Posted January 23, 2018 Author Share Posted January 23, 2018 Hi So Problem is not solved but identified took the 21 pin decoder out of the class 25 and put it in the class 20 worked put the decoder out of the class 20 into the class 25 dont work dead decoder in class 20 , so next stop i think is to buy the Hornby TTS class 20 chip/speaker assembly and fit or a more expensive one from olivias ? Mike Link to post Share on other sites More sharing options...
RMweb Gold pheaton Posted January 23, 2018 RMweb Gold Share Posted January 23, 2018 Can you read any CVs on the class 20 decoder? ive had issues with decoders being long out of use sometimes requiring a CV8 reset on them. i wouldnt write the decoder off just yet.... however be warned if its a factory default sounds a cv8 reset may screw the speed matching requiring a reblow but atleast you still have potentially a working sound decoder. Link to post Share on other sites More sharing options...
Mike-Greg Posted January 24, 2018 Author Share Posted January 24, 2018 (edited) Hi No it will not read or write I tried with the Hornby Elite and with the Gaugemaster Pro also with decoder pro it comes up with XXX or 255 decoder pro can not even see the decoder I tried a reset still no go Mike Edited January 24, 2018 by Mike-Greg Link to post Share on other sites More sharing options...
RAF96 Posted January 26, 2018 Share Posted January 26, 2018 Not a wise move connecting a battery across the motor terminals if the decoder was still in circuit. If it wasn't poorly before it will be now. Rob Link to post Share on other sites More sharing options...
Mike-Greg Posted January 26, 2018 Author Share Posted January 26, 2018 Hi Decoder was out so was blanking plate on first try on 2nd try blanking plate was in it was just to check motor was ok Mike Link to post Share on other sites More sharing options...
SRman Posted January 27, 2018 Share Posted January 27, 2018 Hi No it will not read or write I tried with the Hornby Elite and with the Gaugemaster Pro also with decoder pro it comes up with XXX or 255 decoder pro can not even see the decoder I tried a reset still no go Mike Resetting ESU sound decoders can take more than one attempt. Don't bother trying to read it at this stage, just keep trying to reprogram CV8 again. As pheaton said, this can happen with the ESU decoders. Also, you could try the reset by installing the decoder temporarily in your class 25 again. I once found a Bachmann 4 CEP unit that refused to accept programming, yet the decoder reprogrammed perfectly well when installed into a Hornby class 60. If you go down the track of getting the Hornby TTS sound decoder (which seems to be getting good reviews), don't forget you will need an adapter to convert the 8-pin TTS to the 21-pin Bachmann pcb, and you may also need to replace the Bachmann speaker with an 8 Ohm speaker to suit the Hornby TTS decoder (the Hornby speaker may be too big to physically fit in the class 20). Link to post Share on other sites More sharing options...
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