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Don Bowey

On 12/20/06 5:55 PM, in article
, "
wrote:

Franc Zabkar wrote:
On 19 Dec 2006 07:40:57 -0800, put finger to
keyboard and composed:

Franc Zabkar wrote:
On 18 Dec 2006 14:32:50 -0800, put finger to
keyboard and composed:

Homer J Simpson wrote:
wrote in message
ups.com...

I have a R/C car reciever (Kyosho Mini-z) which has become very poor
range recently. I have checked battery both on the transmitter and at
the car, crystal, and wiring, they all seems to be fine. The symptom
is if I have both the transmitter and the car switched on, the car will
twitch (the servo) badly, and the motor is start to running on its own
without me pressing anything.

What happens if the transmitter is switched off?

The car will totally stop twitching. So, I thougt it could be
transmitter that was bad, but I tried with 3 different transmitter and
still the same... Looks as if the receiver has problem treating the
incoming signal?

This makes no sense. AFAIK the transmitter should not transmit
anything until you move the joystick, otherwise its 9V (?) battery
would quickly go flat.

- Franc Zabkar

Franc, the transmitter for radio control car would start transmitting
immediately after you turned on, that's why it is a MUST for hobbist to
switch on transmitter before turning on the car.

I've repaired quite a few toy R/C cars and don't recall ever
encountering one where the transmitter would transmit continuously
without user action. In fact some remotes had no on/off switch. Maybe
your hobbyist vehicles behave differently, but it still begs the
question, what is it that the transmitter is transmitting? I can
understand it signalling forward/reverse/left/right/turbo, but why
would it signal a "do nothing" command?

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

I would think the hobby grade transmitter are quite different than the
toy grade RC. With the hobby grade transmitter, they are not only with
4 signal, but are propportional. So, there are steer trim and throttle
trim noob/button so that you adjust the car's alignment or throttle at
its neutral position. So, it is also dangerous for nitro or high power
electric car to switch on the power on the car first before the
transmitter is on. I don't exactly know how things work, but I think
the transmitter should be on to keep the car in neutral position before
applying throttle or steering.

But back to my very desperate question [I have no car to play for
almost two weeks now :-( ], I have heard from other hobbyists
mentioned when they have the powered on transmitter antenna
accidentally touch the antenna would fry the car's receiver; and I have
heard they fix the receiver by replace an inductor. I guess the
inductor on the circuit board usually begin with "L"? Do you think I
can check if the inductors are blown without investing with a probe or
occiloscope by using just a DMM?

Are you certain the transmitter and receiver are on the same frequency?