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Offline AK48Topic starter
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« Reply #20 on: March 12, 2018, 03:54:36 pm »
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hello ! no blood , just some mud

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Offline nickel_n
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« Reply #21 on: March 13, 2018, 03:54:32 am »
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Quote:Posted by AK48
hello : you're right , a new PCB pic from left to right :

2 : pot marked 203 ( 20Kohm )

5 : smid resistance marked : 270 ( 270Kohm )

that's all , no componants on the backside
best regards


if the resistor @ No5 is marked as 270 its only 27ohm NOT 270kohm


                                                  3 figure SMT resistor code system
A three figure SMT resistor coding system is the one that is normally used for standard tolerance resistors.
As the name indicates this SMD resistor marking system uses three figures. The first two figures in the code indicate the significant figures, and the third is a multiplier. This is the same as the coloured rings used for wired resistors, except that actual numbers are used instead of colours.
Therefore an SMD resistor with the figures 472 would have a resistance of 47 x 102 ohms, or 4.7kΩ. However beware of resistors marked with figures such as 100. This is not 100 ohms, but it follows the scheme exactly and it is 10 x 100 or 10 x 1 = 10 Ω.
 
Three figure SMD resistor code
Where resistance values less than ten ohms are used, the letter "R" is used to indicate the position of the decimal point. As an example, a resistor with the value 4R7 would be 4.7Ω.



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Offline AK48Topic starter
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« Reply #22 on: March 13, 2018, 05:44:09 am »
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hello dear nickel , you're right and i'm wrong but in fact i'm right and you're wrong , i'm gonna tell you why , i've made mistake , the smid resistor is marked : 274 , not 270
magnify attached pics below and look again

thank you "eagle eye"

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