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Dr_C

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Dr_C

271 posts

In case anyone experiences problems similar to above and plans to reposition the IR LEDs on the underpan of their SSD cars... there is a brief summary describing how the ARC PRO start-finish sensor operates... via the link below...

 

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https://www.slotforum.com/forums/index.php?showtopic=187947&p=2226501

Dr_C

271 posts

The problem with ARC PRO and 2-into-1 chicanes is that you cannot allow the two primary lanes from the powerbase to reduce to a single lane as this causes the powerbase to overload. Technically the two primary lanes through the ARC PRO power base are wired with opposite digital polarities.

 

The layouts shown above expand the two primary lanes out to four lanes, and the 2-into-1 chicanes then reduce back to just the two primary lanes... so that all looks fine. The issue would occur only if the 2-into-1 chicanes were used directly to connect together (electrically bridging) the two primary lanes...

 

Hope that helps...

 

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Dr_C

271 posts

Hi JohnHG,

 

Sorry to hear you are having problems with the ARC app when using Andriod  7.0.

 

To date, I have only tried Apple iOS. In my case I have had 100% success with all variants of iphone and ipad that I had tried using the ARC APP. Well... except for cases were I have tried to use the pacer car function which has been a bit of a disappointment.. but the rest of the ARC app functionality has been truely amazing!

 

I am very interested in trying the Android app, too, and wonder what device you are using with Android 7.0 which is giving the problems?

 

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Dr_C

271 posts

Hi dd213, we all do these things... I managed to brick a brand new APB powerbase a few months ago by loading the wrong firmware... I just happened to be very very lucky that a solution came into focus... however the ARC PRO uses more advanced technology for firmware upgraded and so far more difficult to rectify if you go off course... if you are in the US there are some amazing deals online for just the ARC PRO without transformer and without wireless controllers... might be worth investigating...

 

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Dr_C

271 posts

ok yes... this is more difficult than I had assumed... If you programmed the firmware into thinking it is a different type of device - for example a wireless controller - then the sequence for setting the BLE device into DFU mode for firmware update over air by nRF tools may itself be different. It may therefore be necessary to reflash using the J-link hard wired interface which needs specialist knowledge and interface hardware. Probably best in this situation to ask Hornby customer support whether they could help you by reflashing the main nRF51822 processor with BLE v2.6 firmware.

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Dr_C

271 posts

Hi MichaelDrago,

I am sorry to report it does seem likely that the brake transistor Q1 or Q3 is damaged and giving a short circuit... which has the effect of holding the brake in the on condition. There is a small chance there is a short circuit elsewhere on the copper tracks but we cant see anything in a position that would cause this type of short circuit. The earlier identified curved marking,.. if it was a short between tracks would have the effect of presenting the brake from turning on... so cant be the problem.

The challenge in replacing Q1or Q3 is that they are surface mount conponents so quite difficult to handle. I could take a look at it for you... but the postage costs times 2 between uk and usa would I think exceed the value of the powerbase. I wonder if Scalextric customer service might be able to help with a replacement?

 

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Dr_C

271 posts

First, the car needs track power to power up the IR LED... so fitting the SICH10 without electrical connection could never be expected to register laps in digital mode. For the test to be valid the car needs track power.

 

Next, if you are comparing with analog cars... sounds like you may have then switched the powerbase from digital to analog mode... for analog the track IR photosensor for ID is not used at all.

 

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Dr_C

271 posts

Hi dd213, did you try loading the BLE v2.6 firmware onto the ARC PRO using nRF tools? If so, what happened?

 

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Dr_C

271 posts

I still believe it would be useful to try the slot.it SICH10 guide blade as a potential interim solution... I agree that Scalextric should offer a solution if ultimately it is proven to be a design issue... but the SICH10 is little more than the cost of a good cup of coffee... so worth a try?

 

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Dr_C

271 posts

Hi MichaelDrago,

What you have found may be significant... perhaps along the lines of a defect during manufacturing whereby the copper material has not been fully etched away between the tracks on the circuit board. Given these narrow tracks connect with the gate drive of the power MOSFETs... might be the problem... please leave as is for the present and I will get back to you with a test procedure to establish if these are indeed short circuits between the copper tracks... looks promising progress...

 

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