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Author Topic: Graham Farish Class 08 DCC Conversion Issue  (Read 1265 times)

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Offline Railwaygun

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #15 on: February 11, 2018, 09:59:06 pm »
Why is there a capacitor connected between the decoder grey and the orange wire going to the bottom brush?

looks like a solder joint here

lets hear from the OP?
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Offline andyt55

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #16 on: February 12, 2018, 01:14:13 pm »
Many thanks for all your comments.

I have attached another couple of photographs which helpfully explain things better.

The coder grey cable is soldered to an orange cable with goes to the DigiHat on the lower brush clip.
The coder orange cable goes to the leg of the wire that I cut off which connects to the upper brush.
The coder red cable is soldered to the original black cable that is connected to bolt that goes through the chassis to the right hand wheels.
The coder black cable is soldered to the base leg of the capacitor (which I removed) and hence to the chassis and the left hand wheels.
I have cut the yellow, blue and white cables short.

I removed the capacitor and resistor. Any lumps you can see are where I put insulating tubing or insulating tape over my solder joints so they do not short out on the body.

I will try removing the upper brush clip and connecting wire and soldering the orange wire directly to the brush clip.

Andy






« Last Edit: February 12, 2018, 01:16:08 pm by andyt55 »

Online Old John

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #17 on: February 12, 2018, 08:55:51 pm »
Have a look at my post to the TCS site about six years ago.
https://www.tcsdcc.com/Customer_Content/Installation_Pictures/N_Scale/Bachmann/Bachfar%2008/bachman_bachfar_08.htm
It may be of some help.
Also a more detailed conversion of a class 94 that uses the same motor.
http://www.tcsdcc.com/Customer_Content/Installation_Pictures/N_Scale/Bachmann/Grafar%2094/grafar_class_94_m1p.htm
« Last Edit: February 13, 2018, 08:24:54 pm by Old John »

Offline andyt55

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #18 on: February 23, 2018, 05:47:30 pm »
Aargh! >:(

I managed to break one of the yellow wheel tie-rods when working on the loco.  Is it possible to get a replacement driving wheel set, including the tie-rods, for an early Poole era 08113 loco?  I looked on Peter's Spares but couldn't see it anywhere.

Andy

Offline Paul-H

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #19 on: February 23, 2018, 05:57:21 pm »
Have you tied brlines , they do a lot of early Poole items
Please excuse any poor spelling, I am Dyslexic, just think yourself lucky if you can actually read what I typed.

All tiepin as bean spell chequed on mi Pea Sea

Offline andyt55

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #20 on: March 01, 2018, 11:42:24 am »
Thanks very much.  Ordered one from BRLines today.

Andy

Offline Madrigal

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #21 on: March 03, 2018, 01:45:44 am »
There are several possibilities for a short in this type of loco. If you are confident that the decoder is sound then it's either shorting across the pickups after re-assembly or there is a short between the digihat clip and the chassis. Only way to check is remove the decoder and check for shorts across the pickup points with a meter. Then check for shorts between motor pickups and each motor terminal. When it passes all these tests without revealing shorts it's just a case of soldering the decoder in and sealing the joints. As long as the decoder is ok it will then run







Offline Madrigal

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #22 on: March 03, 2018, 01:50:11 am »
If there are any capacitors in there remove them from the circuitry, they won't cause shorts directly but the decoder doesn't need them

Offline NinOz

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #23 on: March 03, 2018, 08:34:55 am »
My issue is that JMRI Decoder Pro reports a short circuit on my test track.  I tested the installation with my multimeter and there is a 100 ohm resistance between the chassis (decoder black) and the upper brush (decoder orange).
Andy
Don't forget that it is possible to get a resistive path through an electronic circuit due to placement (or failure) of components, not sure of level measured values.
I would unsolder the decoder inputs and test the effectiveness of brush insulation, say test resistance or solder the chassis wires to brush wires and test on DC.  Also would test the decoder to see if it is still ok.

CFJ
To be called pompous and arrogant - hell of a come down.
I tried so hard to be snobbish and haughty.

Offline andyt55

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #24 on: March 03, 2018, 09:17:02 am »
My issue is that JMRI Decoder Pro reports a short circuit on my test track.  I tested the installation with my multimeter and there is a 100 ohm resistance between the chassis (decoder black) and the upper brush (decoder orange).
Andy
Don't forget that it is possible to get a resistive path through an electronic circuit due to placement (or failure) of components, not sure of level measured values.
I would unsolder the decoder inputs and test the effectiveness of brush insulation, say test resistance or solder the chassis wires to brush wires and test on DC.  Also would test the decoder to see if it is still ok.

CFJ

Since I will have to disassemble the chassis when I get the replacement driving wheels I will unsolder the decoder then and check all the resistances.

How do I test the decoder?

Andy

Offline NinOz

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #25 on: March 03, 2018, 10:45:41 am »
With a decoder tester. :)
Quick and dirty DIY: Decoder inputs (red, black) to DCC power or rails, outputs (orange, grey) attached to a small motor or a resistance to mimic a motor (100ohm 5W should suffice).
To be called pompous and arrogant - hell of a come down.
I tried so hard to be snobbish and haughty.

Offline Madrigal

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #26 on: March 03, 2018, 11:08:53 am »
The starting point is the chassis. If this has shorts which is the most likely problem you will never solve the issue. Remove the decoder and check the chassis for shorts as described above

Offline Railwaygun

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #27 on: March 03, 2018, 09:47:42 pm »
With a decoder tester. :)
Quick and dirty DIY: Decoder inputs (red, black) to DCC power or rails, outputs (orange, grey) attached to a small motor or a resistance to mimic a motor (100ohm 5W should suffice).


here are the whys and Wherefores

http://www.dccinfo.com/dtester.html

the new ESU tester covers Next18 & sound chips, and is excellent value ( 40) - cost of a decent chip!

uk source here

http://www.coastaldcc.co.uk/products/esu/53900-decoder-tester
This has been a public service announcement
It may contain alternative facts

Caveat lector

The largest Railwaygun, Armoured Train & Military Rail group in the world!
https://groups.io/g/railwaygun/topics

My Military Rail Pinterest area
https://uk.pinterest.com/NDRobotnik/

Motto: Semper ubi, sub ubi

Offline andyt55

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Re: Graham Farish Class 08 DCC Conversion Issue
« Reply #28 on: March 06, 2018, 08:34:19 pm »
With a decoder tester. :)
Quick and dirty DIY: Decoder inputs (red, black) to DCC power or rails, outputs (orange, grey) attached to a small motor or a resistance to mimic a motor (100ohm 5W should suffice).


here are the whys and Wherefores

http://www.dccinfo.com/dtester.html

the new ESU tester covers Next18 & sound chips, and is excellent value ( 40) - cost of a decent chip!

uk source here

http://www.coastaldcc.co.uk/products/esu/53900-decoder-tester


That looks to be ideal; I've ordered one.

Andy

 

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