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THR101 in the power supply

2012-11-26 by kgslug2

This is my first post, so I guess I should say hello!

I have recently brought an EII with a dead PSU. Q103 was shorted and R106 burnt and open-circuit.  Both bleed resistors, R101 and R108 were also rather scorched and C111 was incinerated. I have been drawing up a list of replacement parts and intend to replace all of the capacitors as well as the obviously failed components.

Unfortunately while handling the board, I managed to break a leg off of THR101 and this leads to my question. Does anybody know what it is? I assume it is some kind of thermistor, but it seems to be completely lacking in markings.

The other component that I am not sure about is R106. The value of this is missing on the schematic, but I read somewhere that it is 1 Ohm, 1/4 watt. All the other resistors in this section are 1/2 watt, so I would like some confirmation as to it's power rating. The only reason that I can think of for it being 1/4 watt, would be that it is intended to be a fusable resistor.

Thanks,
Kevin

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