74462 Digital Decoder failure

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74462 Digital Decoder failure - Digital Decoder failure

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Timnomads		#1 Posted : 23 May 2022 09:53:33(UTC) Retweet
Joined: 16/09/2015(UTC) Posts: 284 Location: Grandvaux - Lausanne - Switzerland		Hi All I have just had to replace the 745462 Digital Decoder on one of my points. As this contains no mechanical parts I was rather surprised. I inspected the card for any black burnt bits and to my relief found none. Has anybody else experienced this item failing, is it common, can I expect a lot more failures? As it is over two years old and so out of warranty, it could be rather expensive. Tim

3 users liked this useful post by Timnomads		river6109, twmarklinfan, marklinist5999
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twmarklinfan		#2 Posted : 23 May 2022 11:38:23(UTC) Retweet
Joined: 08/05/2015(UTC) Posts: 344 Location: Tunbridge Wells, Kent, United Kingdom		Hmm, I use quite a few of these but I haven’t had a failure yet. Have you thought about the Viessmann equivalent? They are a little cheaper. The point motors however is quite a different story as has been well documented in this forum.


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ocram63_uk		#3 Posted : 23 May 2022 14:50:04(UTC) Retweet
Joined: 07/01/2015(UTC) Posts: 700 Location: England, Suffolk		have u tried it on another switch? are you 'calling' it with its correct id on the controller? I say this because I had some problems in the past with them and it always came down to the two items I listed.

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Timnomads		#4 Posted : 24 May 2022 15:15:17(UTC) Retweet
Joined: 16/09/2015(UTC) Posts: 284 Location: Grandvaux - Lausanne - Switzerland		Originally Posted by: ocram63_uk have u tried it on another switch? are you 'calling' it with its correct id on the controller? I say this because I had some problems in the past with them and it always came down to the two items I listed. Hi I have a spare card and set that to the same address, worked. I also tested the damaged card with a different point motor. Therefore I deduced the digital card has a problem. Tim


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David Dewar		#5 Posted : 24 May 2022 21:22:14(UTC) Retweet
Joined: 01/02/2004(UTC) Posts: 7,284 Location: Scotland		Not had a problem with them but it is possible the connection to the track or the decoder has come away. Check the address and change it and try again.
		Take care I like Marklin and will defend the worlds greatest model rail manufacturer.


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clapcott		#6 Posted : 25 May 2022 03:00:14(UTC) Retweet
Joined: 12/12/2005(UTC) Posts: 2,426 Location: Wellington, New_Zealand		The 74462 is soft programable. In order to bisect a problem between logic (IC) and switch function (pulse power to the point motor) you might try to just do a basic Read of the address. In doing so you will also confirm that the switches match. Comment: for these devices it is possible to programmatically change the address to be different from the DIP switch setting. The programed address will stay in effect until the switch setting is changed and the device repowered. If you do not use mFX ... I suggest - Setting your controller to DCC only - Set DIP-10 ON (DCC mode) - Connecting to the programing track - Read CV1 (and CV9) You may wish to do the test on a known good item first to get confidence with the procedure. WARNING: Do not rely on the power of the Programming track output to drive the actual motor/solenoid. The programming may be done without a solenoid attached, if you do make progress with being able to read/set the address, then reconnect the item to the main track output to test actual switching further.
		Peter


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Timnomads		#7 Posted : 25 May 2022 09:21:40(UTC) Retweet
Joined: 16/09/2015(UTC) Posts: 284 Location: Grandvaux - Lausanne - Switzerland		Originally Posted by: clapcott The 74462 is soft programable. In order to bisect a problem between logic (IC) and switch function (pulse power to the point motor) you might try to just do a basic Read of the address. In doing so you will also confirm that the switches match. Comment: for these devices it is possible to programmatically change the address to be different from the DIP switch setting. The programed address will stay in effect until the switch setting is changed and the device repowered. If you do not use mFX ... I suggest - Setting your controller to DCC only - Set DIP-10 ON (DCC mode) - Connecting to the programing track - Read CV1 (and CV9) You may wish to do the test on a known good item first to get confidence with the procedure. WARNING: Do not rely on the power of the Programming track output to drive the actual motor/solenoid. The programming may be done without a solenoid attached, if you do make progress with being able to read/set the address, then reconnect the item to the main track output to test actual switching further. Thanks I will read it again very carefully and do the test. Tim


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