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Author Topic: First hardwired install FAIL TO READ  (Read 575 times)

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Offline exmouthcraig

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First hardwired install FAIL TO READ
« on: April 01, 2020, 12:34:02 PM »
 :helpneededsign:

I recieved my Zimo mx616 hard wired chip this morning, great I thought I'd have a go at wiring it into my latest spec class 08.

I have removed about 4mm off the top of the gearbox shield to allow it to install ontop.

The guide I followed had

Red to rear copper L shape contact
Black to front copper contact (I have bent that 90° forward to eliminate shorts on the chassis)
Orange bottom left motor contact
Grey top right motor contact (both as viewed from the front of chassis)
Now my soldering isnt award winning BUT they are all connected quite firmly and definitely nothing touching each other.

So quite happy with how I managed to get on I put her on the programming track and it attempts to read CV8 and CV7 but then throws up a READING FAIL CHECK CONNECTIONS.

The programming track definitely has power but clearly something has gone wrong  :veryangry:

Offline NGS-PO

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Re: First hardwired install FAIL TO READ
« Reply #1 on: April 01, 2020, 01:23:37 PM »
(PLEASE NOTE: Unless where obviously posting on behalf of the NGS, all posts and views are my own and not connected/endorsed by the Society.)

Anxiety is a lot like a toddler. It never stops talking, tells you you’re wrong about everything, and wakes you up at 3am.

I get nervous about just about everything. Sometimes I literally don’t know why I’m anxious. I just am and no-one seems to understand that.

Offline exmouthcraig

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Re: First hardwired install FAIL TO READ
« Reply #2 on: April 01, 2020, 01:37:40 PM »
I will add that the first time it failed to read I ran it on DC which is 8ft straight run and it has worked faultlessly up and down on this track yet DCC still failing to read  :veryangry:

Online ntpntpntp

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Re: First hardwired install FAIL TO READ
« Reply #3 on: April 01, 2020, 01:48:42 PM »
Can you read other decoders ok on the programming track?  ie. narrow the problem down to this particular loco/decoder?

Programming track should only have power whilst actually reading/writing.
Nick.   2016 celebrating the 20th anniversary of "Königshafen" exhibition layout!
https://www.ngaugeforum.co.uk/SMFN/index.php?topic=50050.0

Offline exmouthcraig

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Re: First hardwired install FAIL TO READ
« Reply #4 on: April 01, 2020, 01:56:09 PM »
Yep, all 4 others, hardwired and plug in all read, the programming track is a totally separate piece of track wired to the controller, the layout runs off it's own separate connection.

Online ntpntpntp

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Re: First hardwired install FAIL TO READ
« Reply #5 on: April 01, 2020, 02:04:12 PM »
hmm... I'd be inclined to uninstall the decoder temporarily and test it  by simply connecting red/black to the programming output and fitting a 100 ohm resistor on orange/grey (or an old spare motor if you have one)
Nick.   2016 celebrating the 20th anniversary of "Königshafen" exhibition layout!
https://www.ngaugeforum.co.uk/SMFN/index.php?topic=50050.0

Online Only Me

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Re: First hardwired install FAIL TO READ
« Reply #6 on: April 01, 2020, 02:10:19 PM »
Have you isolated the bottom pcb pickup from the chassis where you soldered the red wire to!??? If not you will have created an open circuit across the motor... capton tape requires or similar over the back on the pcb between the red wire solder point and the pcb

Offline exmouthcraig

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Re: First hardwired install FAIL TO READ
« Reply #7 on: April 01, 2020, 02:25:53 PM »
@ntpntpntp sorry Nick absolutely no idea what any of that stuff is let alone having any  :dunce:

@Only Me






Online jpendle

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Re: First hardwired install FAIL TO READ
« Reply #8 on: April 01, 2020, 02:28:32 PM »
Hi,

Do you have a multimeter?

If you do then check continuity between each rail and the appropriate wire on the decoder.

If you don't, then it's a very useful tool to have when messing with electrics  ;)

John P
Check out my layout thread.

Contemporary NW (Wigan Wallgate and North Western)

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=39501.msg476247#msg476247

Online Only Me

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Re: First hardwired install FAIL TO READ
« Reply #9 on: April 01, 2020, 02:29:53 PM »
Um i think you need to practice soldering skills, the black wire looks like you might have melted a hole in it which when putting the body on may cause a short, looks like the grey wire is shorting on the motor casing, also where you have the black wire you snould have soldered to the piece of phosphor bronze but thats nowhere to Be seen now??

Offline exmouthcraig

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Re: First hardwired install FAIL TO READ
« Reply #10 on: April 01, 2020, 02:42:45 PM »
Yeah i know its horrific  :'( it's no where near what I'd like!!

The black wire is on the bronze piece that I bent 90° forward to miss the pad where the orange is soldered so as to not cause any issues with shorting.

I have trimmed the grey wire and resoldered that to that pad, its fractionally better then before!!

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Re: First hardwired install FAIL TO READ
« Reply #11 on: April 01, 2020, 02:44:46 PM »
So the black will also touch the chassis then if youve bent it as theres very little space

Offline exmouthcraig

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Re: First hardwired install FAIL TO READ
« Reply #12 on: April 01, 2020, 03:01:15 PM »
No theres a few mil between the chassis and the bronze peg. Is it worth wrapping that in tape??

Luckily everything else is plug in chips  :dunce:

On a positive note, I have cleaned the wheels and she has registered on the programming track so hopefully even though the soldering is horrendous I havent done any damage to the chip

Online ntpntpntp

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Re: First hardwired install FAIL TO READ
« Reply #13 on: April 01, 2020, 03:29:45 PM »
Must admit I did wonder about clean wheels and rails but assumed you'd dealt with that.   Cleanliness is vital for DCC. Remember the with program track the loco only does tiny "dances" as it acknowledges and responds to programming commands.
Nick.   2016 celebrating the 20th anniversary of "Königshafen" exhibition layout!
https://www.ngaugeforum.co.uk/SMFN/index.php?topic=50050.0

Offline exmouthcraig

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Re: First hardwired install FAIL TO READ
« Reply #14 on: April 01, 2020, 03:57:04 PM »
Yeah I got the little jumps but shes still struggling on the layout. All other dcc locos run fantastic on the layout.

She maybe destined for DC only.

I will spend considerable time now learning soldering, however any others that need hard wired chips will be going to some one for that upgrade.

One must remain aware of his limits and stay well within that pen!!!  :dunce:

 

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