Resistor for KLH 120 subqoofer

if you can look at the underside of the board with the resistor on it, take a magnifying glass and look around the pins poking through from the components. It may be that the heat as unsoldered a component (be it resistor, capacitor or otherwise). Look for gaps in the solder around each pin, and if there are any holes around the pins, try filling them in with a little solder.

I would fit the same type, unless the schematic shows a change, which clearly it doesn't. However I would be surprised if R42 burnt up alone! Look at the schematic, is R42 linked to any other transistor or part? If so check them if you can.
By the way is R42 a fuseable resistor, for example is the symbol on the schematic or on PC board different to most other resistors?

Did you ever find a solution for this problem? I have the exact same thing happening with my KLH subwoofer and I'd love to know how to fix it!

There are a lot of folks who've had power supply issues with this sub. Typically, the large resistors fail, which takes out the capacitors.

If you know how to read schematics and replace parts, then these might be helpful to you:

Here are the two pages of schematics from KLH. I wrote to their tech department and explicitly asked for permission to share them here.

Here's the lower board, which has the power supply:
KLH ASW 10-120 subwoofer schematic - lower board


Here's the upper board:

KLH ASW 10-120 subwoofer schematic - upper board

470.000 ohms not 470 ohms 470k ohms at 5% tol. either the main p.s. diodes are shorted or the output and driver transtors are shorted causeing the fuse to blow....

First of all a resistor color coding of Yel-Vio-Yel is 470Kohms not 470ohms. You are probably reading some stray voltage in the circuit. Yes, both NEG terminals of the speakers are common. Usually a receiver that blows the main fuse has a power suplpy problem. Check the recifier diodes for shorts. Other than that, the output transistors may be shorted.

Check those out and post the results.

Dan

There are a lot of folks who've had power supply issues with this sub. Typically, the large resistors fail, which takes out the capacitors.

If you know how to read schematics and replace parts, then these might be helpful to you:

Here are the two pages of schematics from KLH. I wrote to their techdepartment and explicitly asked for permission to share them here.

Here's the lower board, which has the power supply:
KLH ASW 10-120 subwoofer schematic - lower board


Here's the upper board:

KLH ASW 10-120 subwoofer schematic - upper board

big red
check usually the fuse just blows up just change it

I realize that this is an old problem, but folks are still finding it on searches, so here goes.

Here are the two pages of schematics from KLH. I wrote to their tech department and explicitly asked for permission to share them here.

Here's the lower board, which has the power supply:
KLH ASW 10-120 subwoofer schematic - lower board


Here's the upper board:

KLH ASW 10-120 subwoofer schematic - upper board