November 2014 |
EU Decoder to NMRA Hard Wired Decoder Conversion for By Eric Sitiko The latest releases of the Bowser DCC Ready-To-Run trolleys including the recently released Perley-Thomas New Orleans 900 series streetcar (June 2014) and the latest of PCCs that just arrived early last month have a new decoder plug with which many of us in the US are unfamiliar. The plug is a European type 21-pin plug. To convert this to an NMRA Hard Wired Decoder or even an NMRA 8- pin plug the easiest thing to do is to modify the dummy (DC) plug included with the DCC/Sound Ready models. There are also commercial EU 21-pin to NMRA 8-pin plugs available for those that want to go that route. Making the adapter plug is fairly simple, but due to the circuit board being double sided, care must be taken to cut all the traces remaining when modifying the circuit board. To modify the board, remove the shell from the model. Remove the dummy board by the pulling it away from the large board. It is a tight fit, but only a friction fit. Once you have the board removed from the model note where the through holes are on the board between the 21-pin plug and the diodes and resistors on the other portion of the board. Using a razor saw or sheers, cut the board right through the center of the through holes and discard the section of the circuit board without the 21- pin plug. Using your volt-ohm meter, check the continuity between each of the pins and all other pins. I found a couple of sneak circuits between the headlights and track power. Cut the traces where you find continuity and inspect the board for anything that might cause a future short circuit, like frayed copper traces and other conductive circuit board material. Now that you have a clean circuit board containing the 21-pin plug, use the diagram below to identify to where to solder the decoder wires. I used a M4 decoder from TCS. As this is a 4 function decoder and there are 5 functions on the car, I combined the route signs and destination sighs by soldering the purple wire on both pads. This gives 4 separate functions. One each for the headlights, interior and route/destination control in DCC. Once soldered, I checked all the connections using a magnifying glass to ensure that there were not any shorts or stray wires. After all checking was complete, I installed the board back into the model and put the model on my programming track. I use JMRI to do all my programming. I started by just checking my wiring using address 3 and turned on all the lights and checked motor operation. It all worked! I then programmed the functions and motor to my liking. New Orleans RTA runs the headlights on all the time in service, but I wanted to know which way the car was going, so my trailing headlight is slightly dimmer. This was a simple project to make use of a decoder I already had in a great new model. If you have any problems with either this conversion or others drop me a note. For an upcoming issue I am going to continue this DCC corner with a sound conversion and other wiring changes I made to the Con-Cor Electroliner. Until then, happy modeling. Note: The Trolleyville Times accepts no responsibility for damage caused to models by modelers attempting this procedure. Modelers are cautioned to realistically assess their capabilities before attempting this procedure. About the author: |
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We have been made aware of three possible issues with these PCC cars. The first is the trolley pole issue reported in the first paragraph in this article. Since it's introduction in 2009, the Bowser Ready-To-Run PCC car has always been able to negotiate 9" radius curves but has been able to be modified to negotiate curves as small as 5.75" radius. While there was an effort to build this low-radius capability into the Phase Four models, a second issue still remains with these cars and a third has arisen. The second issue is the thin brass guard over the power truck gear tower that should be carefully removed. This guard, installed as an oil splash shield has been placed on all model PCC cars manufactured to date, and can strike the window casting inside the car, and restrict the swivel of the power truck. According to Bowser Manufacturing, this guard will be removed in all future streetcar releases. But, unfortunately, you will must remove the shell to access this part. This was not an issue when using the ANT/TRK switch required the shell removal. The relocation of the ANT/TRK switch makes the removal of the shell unnecessary. The shield is a thin brass part that can be carefully removed. Avoid the thin enameled wires that power the headlights and dash lights when removing the shield. The third problem which just has arisen involves the brass pickups, known as part 1388. This is the part that transmits electric power from the wheels to the circuit board. When the decision was made to install speakers in all cars, the tabs on this part were shortened by the manufacturer to clear the bottom of the speaker housing which is directly over the rear, unpowered truck. Below left is the part 1388 as used until recently. At right is the manufacturer redesigned part now used. The manufacturer for some reason has chosen to solder the pick-up wires only to one side of their fabricated part, regardless which side the of the truck that the part is placed. Unfortunately, on one side of the car, this places the wire and the solder on the outside of the part which can reduce the swing of the truck. Up to this point this is confined to the operators (no doors) side of the car and involves only the black wire from the power truck. After many possible remedies were evaluated, John McWhirter of the Southern California Traction Club developed the simplest solution. Just remove the original equipment part 1388, detach the wire, remove all solder from the one side, prepare and resolder the wire to the opposite side and replace the part. You can also reshape the top of the tabs to fold over the power truck gearbox before you resolder the wires to that area, ensuring that there would be no interference with the swivel of the power truck. This should be attempted only by serious modelers with good soldering skills and a steady hand. Both of these procedures can be done without disassembling the car. The club subsequently performed this procedure on five such cars after which they all worked satisfactorily and operation on tight radius curves resumed. For the record, Phase I Bowser PCC cars are defined as the first ones released in 2009. They have flat faced nickel silver wheels and the older track brakes used on the Bowser traction mechanism since 1999. The Phase II cars came with windshield wipers, simulated super resilient wheels and B-2 "sideframes". Phase III cars eliminated the original brass bearings, part 1257 and replaced part 1256, the current pickup with part 1388, which performed the functions of both former parts 1257 and 1256. Phase IV cars have the ANT/TRK switch relocated to the bottom of the floor, thereby eliminating removal of the shell to activate. Process improvement has been continuous with these cars. Notice: Trolleyville will not accept any level of responsibility for models damaged during the conduct of any of these procedures. |
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Southern California Traction Club Opens a New Door! The Southern California Traction Club (SCTC) often wondered why more young people did not embrace the fun of running model streetcars. The obvious answer was maybe they did not know. They probably had never done so. We knew of no hobby shop that had a layout on which customers could actually operate trains. So the best way would be to show them and maybe the club could do that. The club decided to embrace DCC and set a loop of track on the layout aside for visitor operation. Stops were designated with yellow bands on the trolley line poles at corners of intersections similar to that done in Philadelphia many years ago. Trolleys with the automatic stop feature (Trains Control Systems, Soundtraxx and ESU decoders) were selected for this loop and visitors were selected. After some training runs, the visitor would be allowed to operate the car, ring the bell and stop the car. The plan was that once the visitor mastered the ability to control the car, they would be given a Certificate naming them as "Honorary Streetcar Operator ". The training loop was located on two modules constructed in 2006 and 2007 which encircled a four track trolley barn. The visitor would have to make four stops without having the car enter the intersection. Visitors interested in taking part in the program would be asked to fill out the form below and they would be called when the loop was ready: The first show where this was to be introduced was the NMRA-LA Division annual model train show at the South Coast Botanic Gardens in Rancho Palos Verdes, CA on October 25-26, 2014. This show had layouts of all major scales except O scale. The O scale club cancelled the evening before the show due to an emergency with one of its members. The large scale group was set-up outside among the plants as is normally the case. The SCTC offered operation of the model trolleys to several young visitors and many of them accepted the offer. The car used was Bowser Los Angeles MTA PCC 3148 which had been retrofitted with a Bowser/Soundtraxx-Tsunami chassis. This car gave the user the sounds of the motor-generator, doors opening and closing, bell, passenger signal and wheel squeal. It also had an automatic passenger stop sequence with brake light activation. But the car has a built-in deceleration rate which must be mastered by the operator before the car will stop where desired. Shown below while operating the car are Charley Henry (below left), Joseph Chang (below center) and Nathan Reynoso (below right) taking their turns operating the car on Saturday:
The chance to operate the car was received well. In fact two of the three operators shown in the previous photos came back for another crack at running the car. It was amazing to see the looks on their faces as they mastered the operation of this car. On Sunday twice as many prospective operators lined up for their turns. Below left are Max & Leo Amir with instructor John McWhirter after their turns were completed. The center photo shows Gabriel Aguiar while operating the car and Jared and Lawson Kramer during their turns.
The club displayed their developing Light Rail Vehicle Display for the first time. On the display you can see models of Boeing LRVs from both Boston and San Francisco. A red San Diego Siemens LRV along with a model of a San Francisco Breda LRV. Philadelphia Kawasaki LRVS and PCCIIs were also seen on the display throughout the weekend. The New York City subway car had just become inoperative and was just placed there when the photograph was taken. The club had returned to the South Coast Botanic Garden after a one year absence. This year the Los Angeles Division has a new Superintendent, Michael Allee, who has held this position since February 2014. He brought to this show a degree of intelligent management not seen for some time. After a brief conversation, we are convinced that he will return the show to it's apex which occurred while under the direction of Mary Barstow. The club will continue this program at the Anaheim Train Show in January 2015 and possibly at the Del Mar Train Show in February 2015. |
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