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MarsdenHall

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MarsdenHall

26 posts

The replacement decoder arrived today from that well known place in Widnes. Fitted it and the Class 40 has sound again. I am still not sure while it failed but I will store it in my non-powered storage sidings instead of the MPD.

The old decoder is now fitted to my Class 23 

 

Peter

MarsdenHall

26 posts

@Ericm0hff

How did you check that the speaker was working? Or were you assuming that because the wires were connected, it was ok?

No assumptions. I unsoldered the speaker from the wire, tested with an ohmmeter also tried the old 1.5v battery test to hear the clicks. The speaker is in better nick than the decoder.

 

Peter

MarsdenHall

26 posts

@RAF96

I have the following CV values

 

CV7 = 48

CV7 and CV8 are reversed. Value 48 is CV8 code for Hornby Hobbies

CV8=132

CV7 = 132 is decoder firmware ID. Read this in conjunction with CV159 and you can ID the loco type.

CV182=4

CV182 is normal master volume. Value 4 is default (range 0 to 8).

CV184=4

CV184 is offset location of master volume on a small batch of errant decoders.

CV189=255 (This CV not listed in JMRI, what its function?)

 

CV189 is offset location of master volume on a very recent batch of errant decoders.

I only asked for the latter values to see if changing them had an effect on actual volume and if so which one.

 

If you are sure the speaker and its connections are OK , then the decoder is likely to be U/S.

Rob

Rob,

thanks for that explanation also my typo with CV7 and CV8.

 

After more resetting still nothing so the speaker wires will be removed and the decoder becomes a non-sound spare

 

Peter

 

MarsdenHall

26 posts

@walkingthedog

And the sound isn’t switched off (F1)

No, that was my initial way of finding out if the sound works 

MarsdenHall

26 posts

Cry certainly walks OK but no quacks (did a dodo quack?)

MarsdenHall

26 posts

Rob,

I have the following CV values

CV7 = 48

CV8=132

CV182=4

CV184=4

CV189=255 (This CV not listed in JMRI, what its function?)

I have done numerous resets for CV8 both at value 5 and 8 and power downs but decoder is still mimicking a dodo

 

 

Peter

MarsdenHall

26 posts

@howbiman

Have you checked the speaker? They have been known to fail.......HB

please read original post

MarsdenHall

26 posts

I have the ESU pogrammer also the Digitrax Soundloader and while that cannot touch the sound files its a great CV reader and writer. I use all 3 systems (incl JMRI ) when having decoder problems. I can also use the Digitrax hand throttle to read and write CV's.

(I also sent back Class 37 and 31 decoders for a firmware upgrade last year)

 

Peter

MarsdenHall

26 posts

Hi Rob,

Yes it was working well after the firmware update. The master volume is at 4 and I have the latest JMRI update (4.15.2). I have ordered a replacement from that well known place in Widnes.I will have to check all my other TTS fitted locos (Class 37, 31) to make sure they dont have the same problem

Thanks for the reply

 

Peter

MarsdenHall

26 posts

My Class 40 TTs decoder which went for a trip to UK early last year for a firmware update has been sitting quietly in the MPD for the last few months and today I went to use it on the layout and noticed no sound. Everything else works but not a squeak out of it. It went to the programming track (I use JMRI and Digitrax) and I carried out a reset at CV8 with 8 and 5 but still no sound. The connections to the speaker are OK as is the speaker. 

I also tried in JMRI to re-read the decoder and it does not recognise the Class 40 definition which I know is OK

I am loathe to send it back to UK so I am open to any suggestions before relegating it to the spares bin and getting a replacement from Hattons

 

Peter

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