Hello, I am totally new in this, but I am hoping someone here can give
me some tips.

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.

All my electronic knowledge are only from my classes during college,
but I don't have any troubleshooting experience at all. The only test
tool I have is a multimeter, can only test resistance, diode, and AC/DC
voltage. So, I am hoping if anyone can tell me how I can go about to
find out what component has become culprit. And of course the next
question, would be where to buy replacement.

Many many many thanks!

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?

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?

wrote in message
ups.com...

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?

Looks like it is having problems round the detector / decoder areas. You
probably need more then a DMM to fix this.

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

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?

Looks like it is having problems round the detector / decoder areas. You
probably need more then a DMM to fix this.

How should I go about to start troubleshooting? And what kind of test
tool I would need?

On 12/18/06 5:17 PM, in article
, "
wrote:


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

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?

Looks like it is having problems round the detector / decoder areas. You
probably need more then a DMM to fix this.

How should I go about to start troubleshooting? And what kind of test
tool I would need?




What type of receiver is it? Regen, single or dual conversion?

Don

wrote in message
ups.com...

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?

Looks like it is having problems round the detector / decoder areas. You
probably need more then a DMM to fix this.

How should I go about to start troubleshooting? And what kind of test
tool I would need?

Without a service manual, I would need an oscilloscope with an RF probe for
starters.

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

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

Hugh, It is one of those ESC receiver combo for micro size R/C car.
May I ask you how much it would be to fix?

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.

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.