MIG welder controller

[ex 2 Base]

I'm trying to fix a Mig welder wire feed motor speed control board. This one has a TYN 412 Thyristor which tests out OK. Further along the PCB is a series of surface mounted resistors which have numbers such as 122, 100 and 101 printed on their bodies, will they be the actual values of each resistor ? I have put my ohm meter across several and they test as the value marked on their body, but the track has so many other components associated with the circuit I though that I might be just lucky or confused. It is obvious that one resistor has failed and on its body it looks to be 220, I had thought of just replacing it with a 200 or 240. Any practical suggestions will appreciated. Ted

[ppppenguin]

For those who may not be aware of how these codes work, they are effectively the same as 3 coloured rings on a conventional resistor. So 122 is 12 followed by two zeros. 1.2K.

Without knowing the circuit, there's no way of telling if a given resistor value is critcal or not. Something caused that 22 ohm (22 followed by no zeros) resistor to fail. Best would be to find out why it failed. Otherwsie replace with the same value unless you can establish that it's not critical. If there's space there's no harm in using a through-hole component.