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The relatively large size, the flat sheen and grey body color of those resistors is indicative of their use as power resistors. Probably in a power supply for the output devices. They reason one or both are burning is that something downstream of the power they supply is drawing uber current. Just replacing a couple of burned resistors like those will nearly always result in a the new ones burning up also, or worse. You probably have one or more shorted output devices.
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The resistors are dropping the main power supply voltage so the zener diodes can work as + & - 15 volt regulators.
Break out your meter & measure the resistors.
They look like 2 watters, so there is your heat. (scorched PCB, which is typical)
If you have a 'diode check' function on your meter, check the two zener diodes (right next to the dropping resistors) for an open condition (worse case? a shorted zener)Comment
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That to me looks like it may be the color a 390R would turn when roasted (from orange white brown).
Typically those type of circuits run very hot so this is not unusual.
Measure them like Jazz mentioned above, if they all check out there may be solder issues on the flip side due to the heat.Originally posted by Enzo
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