Hantarex Polo 25", burnt resistor value?

kralleman

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I have a Polo that gave up on me a while back that I started looking into. I found a badly burnt resistor (R177) that I am trying to figure out what it should be replaced with. Because it is burnt, it is a bit difficult to see the exact colors but the closest I got was that it resembled 10 ohms, 5%. Measuring it out of circuit gives me something like 2 ohms. Looking at the parts list though, it seems as if it is supposed to be 1 ohm metal film. From what I can see when I look at the burnt markings, that does not quite add up.

From the manual:
R177: "RES. STARTO. MET. 1E, 2%, 1/2W" (i.e. 1 ohm)

So, anyone knows if R177 should be a 1 ohm or 10 ohm? I found some posts indicating that R177 has been known to cause problems.
 
E is ohm. while you're at it change out R167 as well, I think that's 2.2?

both resistors after burning out will give you vertical collapse. :) its not always the vertical IC.
 
Thanks for the reply and the tip on changing that other resistor!

So, the parts list online says it should be a 1 ohm on R177. Still, it looks like the rings on the burnt one (the rings I can make out) on my chassis add up to 10 ohms. That does not match the parts list. I'm thinking maybe there was a revision or something and the resistor was changed to one or the other. Would you have put a 1 ohm one in there anyway, following the parts list?
 
I think R177 is 1 ohm and R167 is 2.2 ohm. unfortunately I don't have a manual for the US version of the chassis, I think there was some kind of discrepancy in the values in the Euro one or something.

I ordinarily take project pictures at work, but I think I lost all the ones from when I was working on Polos.
 
It's 1ohm in both the European and US versions. Only on the smaller Polos (14-20") it's 1.8ohm.

The bands are brown/black/black/silver which means 100 * 0.01 = 1.

R167 is 2.7ohm fusible type.
 
2.7! that's it.

M K L is a Polo expert.

what is a fusable type though? I ordered just regular 2.7 ohm resistors. that resistor gets monumentally hot, I wish there was a longterm fix for that.
 
2.7! that's it.

M K L is a Polo expert.

what is a fusable type though? I ordered just regular 2.7 ohm resistors. that resistor gets monumentally hot, I wish there was a longterm fix for that.

you never want to sub a regular resistor for a fusible one. (a fusible resistor acts like a fuse when the circuit is overloaded and goes to an open state)
 
never installed any of them. I don't even know where they are at the shop right now.
 
never installed any of them. I don't even know where they are at the shop right now.

when they are used its to prevent or minimize other circuitry from failing too, so the fusible resistor goes bad (open) hopefully before other circuitry is affected. most monitors have them in circuitry somewhere and are usually represented as FR101 in stead of R101 in parts lists and the 68ohm FR401 in the G07 is the most common one out there that people see all the time.
 
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