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Colin's Work Bench - On Members Workbenches. - More Practical Help - Your Model Railway Club
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 Posted: Fri Sep 3rd, 2021 05:37 am
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Colin W
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Introducing Colin's Work Bench

Before starting out in earnest to build my new Project, I decided that, like Jeff (SR Man), it would be good to separate the things I will be doing into layout related and work bench related. The latter starts here........

As good a place to start as any is with my DCC installs.

I have had a backlog of DCC related purchases held up when the UK Royal Mail managed to lose a warranty return I'd entrusted them to get back to Youchoos several months ago. This failed Sound Chip of course continuing my long run of being able to find any dud out there in search of a customer! After the inevitable delays I finally just got my insurance payout and a big order has been placed.

My plans included various upgrades to existing stay alives and tidying up wiring on the less than satisfactory jobs.

First job onto the bench was my Hornby Peckett W4 Port of London Authority (R3679) which I DCC fitted with a small ZIMO Processor and SACC 16 stay alive in June 2020:

Peckett DCC Install

While it might look like a neat and tidy job, the one thing I was unhappy about was the long spool of very fine wires from the DCC which I ended up having to bundle up and tuck into a small space between the Capacitors and motor end with risks of fouling or applying pressure to the motor shaft, shown here.




BTW this shows the versatility of the SACC16 as you can snap off the tiny and thin control section (here sitting on top of the gear housing) and have your capacitors elsewhere.

The wires on the MX617 are incredibly fine and inevitably I damaged one when trying to better locate them. Hence a partial rebuild was in order....... TBC
 




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Colin

Westown - Heathfield
Weston Clevedon & Portishead Railway
Project - Green Light
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 Posted: Fri Sep 3rd, 2021 06:08 am
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Colin W
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Peckett #74 Continued

This photo shows my original attempt to access the Ground pad for the Stay alive wire at the bottom of the chip, also the spaghetti of fine wiring is better seen when the Chip is pulled out.



The thick protective sheath on the chip is hard to cut selectively when you have no other option. I've since moved to the Youchoos method of fully removing the outer cover and replacing it with Polyimide (Kapton) tape to seal and insulate when done. This is best done with a new long scalpel blade run along the edge of the chip which will make the cut without risking damage any SMDs.

The six solder tabs on the top side sit very close and I found it just needed iron heat on the wire near to the tab to remove / add back a new wire.




The replacement wires are all DCC Concepts Gauge 32 Decoder wire (DCW-32BK  etc.). The blue and black at the LHS come from the two solder tabs on the rear lower of the chip, now all safely encased in polyimide and much thinner for it! I've gained about 1- 1.5mm extra gap with this easy slimming aid!

I need my SACC 16 for another install so will be fitting a Youchoos Lifelink with some thin Tantalum Caps this time, when they arrive.

PS Useful Tip: Don't throw away the old chip sheath, it's very useful to protect the chip when soldering etc. where you need to hold it in a crocodile jaw on your soldering station.




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Colin

Westown - Heathfield
Weston Clevedon & Portishead Railway
Project - Green Light
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 Posted: Fri Sep 3rd, 2021 05:53 pm
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Petermac
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As you'll probably realise Colin, I'm following this closely - very closely !  ;-)



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 Posted: Fri Sep 3rd, 2021 09:43 pm
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TeaselBay
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Very nice. I always get worried inside a loco. I don’t have much confidence once the top is off. I’m usually worried if I can get the screws back in by that point as well!…



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Chris

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 Posted: Sat Sep 4th, 2021 12:07 am
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Colin W
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Thx Peter, Chris.

There will delays to further posts I had lined up as our NBN Internet supply has gone down JIT for the weekend. 'Twas on the Monday morning......" etc.

Colin



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Colin

Westown - Heathfield
Weston Clevedon & Portishead Railway
Project - Green Light
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 Posted: Wed Sep 8th, 2021 01:44 am
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Colin W
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SR A1X TERRIER #2662 - DCC and Stay alive

This lovely loco made a fleeting guest appearance on Westown back in January and promptly stole the limelight:



Now it finds itself with the prospect of a proper home at Upper Hembury running services on the shared GWR / SR branch to Sidmouth Junction. Initially I'd just popped in a simple DCC with no stay alive and my troublesome insulfrogs were a bit much for it to handle.

 Due to recent changes I have a spare SA on hand so I've reworked and tidied up the DCC configuration and created enought space should I choose to add sound in future.

First step was to strip out the mounting where the 6 pin socket was held (I'd removed the socket and direct wired the 6 pin chip first time around). This is shown below (before cutting the mounting bracket and after). Removing the mount as per the Youchoos method frees up quite a bit of wasted space, there not being that much available in total!



Next; the Polyimide tape has been removed prior to adding the Stay Alive wires to the chip.

TBC . I've been summonsed to go for a walk!



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Colin

Westown - Heathfield
Weston Clevedon & Portishead Railway
Project - Green Light
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 Posted: Wed Sep 8th, 2021 08:46 am
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Colin W
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SR 2662 Continued

The chip I'm using is the Bachmann 36-358A which is a re-badged ZIMO MX622 6 pin, bought because I had an order into Rails at the time for my Loco purchase.

This shows the chip after I've cut away unwanted pins and shortened the other four. The Stay Alive +ve and Ground tabs were identified from the ZIMO manual and the blue and lower black leads attached before taping up securely.



With the Mount removed, the DCC chip sits snugly flat on the base in front of the motor,



The Stay Alive in two parts, Capacitors below ("L" shaped combination) and the tiny control module on top, together sit snugly on top of the DCC. If I were adding Sound, the the speaker would take the place of the SA components, a tight fit though.







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Colin

Westown - Heathfield
Weston Clevedon & Portishead Railway
Project - Green Light
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 Posted: Wed Sep 8th, 2021 09:32 am
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SRman
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Very neatly done, Colin. I have a few of those Bachmann / Zimo decoders in use and they are very good.

I don't have any of the new Terriers, either from Hornby or Rails, but I have done four of the older Dapol / Hornby versions. Space is just as limited in those!  :roll:



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Jeff Lynn,
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