Picked up a TFM-35 today. Guy says(and I trust him), was working fine when it just sort of went poof. Opened it up, saw a couple of seriously fried diodes, sold it to me along with an oscilloscope. Just got it home, just opened up the case trying to identify the diodes. No problem finding them as they are seriously burnt and took out a couple of resistors with it. Could be bad diodes, could just be a symptom of something else (was not the cleanest inside, could even have shorted something out as at some time in it's life, the owner must have had a dog)
Anyway, I digress as usual. Knowing zilch about these, pulled up the manual to identify the diodes - I am new to this so usually have to first find it in the block diagrams before I know where to trace it in the circuit. Now I do have poor eyesight, but no way I can read the diagram of the TFM-35 - basically a jumbled blur of supposedly letters. Pulled up the TFM-25 manual and it is very legible, but obviously do not know if it is the same diodes.
So.....wonder if anyone could tell me what diodes and resistors these are - if you could just tell me the designation (D235, R273 etc)
The location - if you are looking at the Big diodes it has in there, on the TFM-25 they are listed as the 6a2f's, taking for granted the same on the 35, right above the area where there are only 2 of these, there are 2 resistors and 2 diodes I believe (is pretty charred, tough to tell from quick look) - anyone know what these are ?
On the TFM-25 they are R274, R273 and D233 and D235 - I can not tell what they are on the TFM-35 manual as it is so blurry.
Figured I would just replace these , stand back and see if that was the cause or the symptom before I do anything else.
Hopefully not too confusing - any help appreciated. I promise to learn to read the schematics better at some point so I do not need the parts location diagrams - did I mention I am not that bright ?
thanks for any info.
oh, on the TFM-25, they are the DS446 diodes. If that is the same as the TFM-35, would you also happen to know the equivalent diode used for the replacements, if any - thanks