MULTILADER 3

[Johnny65]

Well i don't know if this is the right Place to ask this?
I v got a Multilader 3 and a resistor is broken and i cant find any info on what resistor to Replace it with it.
Specs
Output power :6-8 NiCd (7,2 - 9,6 V)bis 800 mA
TX :8 NiCid (9,6 V) bis 250 mA
RX :4 - 5 NiCid (4,8 - 6 V)( bis 150mA

250V /50Hz / 20 VA
Here is it http://www.graupner.de/en/products/55b4ab53-8423-4916-905e-287143deb4f6/6427/product.aspx

[alanb]

If you can see the original resistor you may be able to read the value from the colour code. To find out about the resistor colour code just Google the topic. In terms of the wattage rating the physical size will give an idea of the rating needed, alternatively this can be calculated by reference to its resistance and either the max current through it or the voltage drop across it.

If the above can't be done please post a picture of the inside of the unit and I will try and help further.

[Johnny65]

Well I cant

[Johnny65]

Well i don't know if this is the right Place to ask this?
I v got a Multilader 3 and a resistor is broken and i cant find any info on what resistor to Replace it with it.
Specs
Output power :6-8 NiCd (7,2 - 9,6 V)bis 800 mA
TX :8 NiCid (9,6 V) bis 250 mA
RX :4 - 5 NiCid (4,8 - 6 V)( bis 150mA

250V /50Hz / 20 VA
Here is it http://www.graupner.de/en/products/55b4ab53-8423-4916-905e-287143deb4f6/6427/product.aspx

Here is the board

[Kevin.D]

Sometimes you can get the value of a  resistor thats badly burned and is  open circuit by measuring half of it's value . If you  remove some of the outer insulating coating  with a fine file to expose the  resistance spiral underneath (be carefull so you dont go to deep with the file and damage the spiral underneath) then  you  can measure the value of the good half of the resistor with one of your meter probes directly on the spiral .   

[alanb]

Judging by the other nearby resistors that are of a similar size they are for current sensing on the outputs. Sorry I can't tell the colour of the third band on the one with the two orange bands. If its silver the value would be .33 Ohms if its gold it would be 3.3 Ohms. The other one is 0.47 Ohms. These may give an indication of the order of magnitude of the faulty one, you could then try a similar value and do some measurements with it in.

[Johnny65]

Well I get 3,9 ohm hm so 3,9*3,9=7,8 Ohm then
 

[Kevin.D]

3.9 ? is that measuring half of it ( try to estimate the centre as close as possible  ) . If so yes then I would go for 8.2 thats your nearest e12 prefered value. Check  resistor temp is ok when testing ,because the original resistor didn't just overheat for no reason there's was something else wrong most likely.

[Johnny65]

well I cut in half and got this reading now from the Resistor 5,4 Ohm  5,4*2= 10,8

[SeanB]

To read with better accuracy take some thin bare copper wire and wind a single turn around the middle of the resistor, then tighten it to firmly press to the film, then read from the one end to the middle. That way you get better contact more closely approximating the end cap crimped all around it. You probably have a 4R7 resistor there

[Johnny65]

I fixed it I put a 5 ohm res to the circuit and now it has the correct Voltage