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The Frustrating Electronics Problem Thread...

The Frustrating Electronics Problem Thread...

Old 02-02-2010, 11:57 AM
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Hi All

At a bit of a loose end, just thought id ask for suggetions

My MI4 has a fault where it cuts out randomly, i mean this could happen anytime, but usually occurs in mid day/afternoon of a meeting. I normally get on with practise and round 1 without any problems.....

The loss of power is not just from the motor, i lose steering aswell, so the whole car shuts down...

The equipment i am using currently are:

LRP SXX TC SPEC (Punch 8-10 usually) Doesnt even get warm
LRP X12 10.5 (6.4-5.8 gearing usually) Motor temps around 60 degree
40mhz 302f receiver
KO Esprit Universe 3
Savox servo.
MRT PT
Team Powers 40c 5000mah lipo

I have tried a different speedo ( i previously had a Nosram Pearl, still the same fault)....i have also tried a new reciever (still the same)...... (i also had it happen once with a speed passion 6.5), so it cant be the motor can it? Also tried different crystals. I will also change my corally connectors this weekend, but there new? No carbon is coming in contact with anything either.

Im stumped..... Are you?
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Old 02-02-2010, 12:10 PM
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Originally Posted by steveonamission View Post
The loss of power is not just from the motor, i lose steering aswell, so the whole car shuts down...
signal issue between radio and receiver? borrow a mate's radio for your next outing.
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Old 02-02-2010, 12:14 PM
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I would say it is your RADIO MODULE....happened to be on my 3PK after I dropped the radio from the driver stand.
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Old 02-02-2010, 01:43 PM
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Steve, look out for the module moving in the Esprit3.... couple of strips of cell tape down the side should stop that

HiH
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Old 02-02-2010, 02:16 PM
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Really?...The module...

But to me, it seems like a power issue rather than a radio issue, i mean if i take the module out when the cars on, it doesnt shut down....it just goes haywire...as it should do.

Ive never had an issue with the transmitter before, and its never been dropped, nothing adds up at the moment.... i'll try a new module tho, cheers.

Im thinking more the Lipo has a loose internal connection now?
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Old 02-02-2010, 02:21 PM
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I know I had my car do that to me a couple of times.. I poped the module out and back in and the car came back to life.. I would really look at that..
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Old 02-02-2010, 06:04 PM
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Are you running indoor on carpet? I have read that belt drive cars with loads of carbon fiber, running indoors on carpet can build up a lot of static electricity. This in turn causes a lot of strange behaviors. Tamiya recently posted a notice about the TA05 on their website.
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Old 02-02-2010, 06:21 PM
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A friend of mine had a similar issue. His problem was a xponder wire that had worn out on both sides and was grounding out. We repaired the wire and his problem went away.
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Old 02-02-2010, 06:56 PM
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Originally Posted by stiltskin View Post
A friend of mine had a similar issue. His problem was a xponder wire that had worn out on both sides and was grounding out. We repaired the wire and his problem went away.
I'll buy you a can of coke if i ever meet you,if this is the problem... because ive just take my pt out, which i run on the lipo side of the car, the wire seems to have rubbed the belt and caused the wire to be exposed coming into contact with the chassis i assume.....fingers crossed
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Old 02-02-2010, 08:14 PM
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Originally Posted by steveonamission View Post
I'll buy you a can of coke if i ever meet you,if this is the problem... because ive just take my pt out, which i run on the lipo side of the car, the wire seems to have rubbed the belt and caused the wire to be exposed coming into contact with the chassis i assume.....fingers crossed
Good luck.

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Old 02-02-2010, 08:19 PM
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Originally Posted by steveonamission View Post
I'll buy you a can of coke if i ever meet you,if this is the problem... because ive just take my pt out, which i run on the lipo side of the car, the wire seems to have rubbed the belt and caused the wire to be exposed coming into contact with the chassis i assume.....fingers crossed
I've seen this problem as well, and could explain the erratic behavior you're describing. Check both of the transponder leads, and make sure that they're not creating a short circuit.
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Old 02-02-2010, 10:58 PM
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i seen where a 4pk will over shadow a ko radio, but thats usually with spectrum, I see your running 40mhz but i wonder.
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Old 02-03-2010, 01:23 AM
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definately check the lead plugs where they go into the reciever.
If frayed or damaged they tend to short out and cause hassles like this.
Also look at the module, had that happen to me with my Spektrum Pro module on my EXZES.
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Old 02-03-2010, 01:31 AM
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Knowing Steve as I do, and how the problem occurs mid way through the day, I'd put money on it being your hands getting all sweaty as the pressure starts to build and you're shorting out your transmitter

Or it could be something else completely
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Old 02-03-2010, 01:44 AM
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i have had a few of these issues as well. my personal had a spot on the lead rubbed through, i sent it away and got it shortened etc to fit a little neater into the car. more recently i had the exact same prob as yourself. my speed control had deans plugs off it, which in my touring car had an adaptor to corally plugs. i tried to take the speedie out and switch it, the problem remained. all my speed controllers have the same setup as some of my batteries have deans pre-attatched. it took my weeks of annoying testing and swapping and the proem persisted. one of the guys i race with took my car for 20 mins and then brought it back telling me it was fixed. i had one of the wires in my little adaptor break, was still complete from outside but had frayed inside. so my lesson was to check every solder joint for continuity before i race. just in case
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