izen

There is an extremely helpful www site with circuit diagrams including component values and a cursory circuit explanation at http://www.thompdale.com/bash_amplifier/bash_amp.htm Good luck fixing your Promedia 4.1! Unfortunately, for my Promedia 4.1, it's my DC-DC Converter board (64014 Rev 6) which is malfunctioning. If you decide to trash yours after all, please consider offering your parts for salvage to the list. I'm on the prowl for replacement new converter board, and Klipsch doesn't sell them.

Dregg, I've been after a schematic myself. Klipsch flat-out refused to even tell me the value of a single resistor in the control pod, claiming it is proprietary. I doubt that leaving the system powered will harm anything other than a small increase in your electric bill. If you happen to have the original 4.1 system, and not the v2, would you mind looking at your R34 in the control pod and telling me the value of your R34? Or telling me the colors of its strips if you don't know the color code? Or sending me a picture if you are color blind? -Joe

There is a good chance that this is due to aging of the only moving part in your amp, namely the potentiometers (variable resistors) on your control pod. They have an internal contact which can create these symptoms as they age. Disuse and temperature cycles often does the trick. If your problem is mild, you can sometimes revive an aging "pot" by turning the knob back and forth many times. This tends to clean up the surface and oxidation on the contact if it isn't too severe. You can confirm the problem by opening up the control pod and (with the unit unplugged) measure the resistance between the contact (often the middle of 3 connectors of the pot and one of the pot ends. It should vary continuously when you turn the knob and should be steady otherwise. If your pots are sufficiently aged, they can be replaced. If you know how to wield a soldering iron, it is not too difficult. You have to find an audio pot with the same resistance. Pots are not too expensive. ... and while you have your pod open, I would really appreciate it if you could tell me the value of resistor R34 or send me a close-up color picture of the pod so I can read the resistor's color bands. See my post at http://forums.klipsch.com/forums/t/108319.aspx I contacted Klipsch tech support last week. Amazingly, Klipsch refuses to tell me the value of resistor R34 (my resistor fell off), but they will sell me a replacement pod for ~$50. For these issues, we users have to support each other! -Joe

Thanks dawaro, but I'm afraid the V2 400 controls were redesigned. I need the value from the original system -Joe

I'm debugging my neighbors Promedia 4.1 which has sat for about a year. When it is hooked up, plugged in and the power switch on the control satellite pre-amp unit is depressed, the LED next to it doesn't light. The manual: http://www.klipsch.com/media/products/owners-manuals/promedia4_1.pdf says: "Once the system is properly set up and plugged in, turn the rear amp power switch to 'on' (-) from off (o)." I do not find any thing like a power switch on the rear of the subwoofer housing or anything else except on the control satellite pre-amp. Neither can my neighbor. Is the manual mistaken, or did I just fail an intelligence test? I opened the preamp and the sub-woofer. (Do not attempt this is you do not know what you are doing. There is a 156 V capacitor that retains its charge, even when the unit is unplugged that has to be discharged before you can safely work on it!). The fuse is good, and everything looks normal in the power amp, save for the missing powr switch. All connections are in place, and nothing looks fried or discolored. The 156 VDC supply measures OK. Not so on the preamp board. One trace from the LED leads through R34 which looks like it *used* to be there from the solder dimples, but the resistor has gone AWOL. I would appreciate it if someone with a working Promedia 4.1 could open their satellite control (unclip it from the speaker, then undo the screws and 1) confirm that R34 is really used, and 2) tell me its value. If you don't know the resistor color code, just email me the colors of the stripes on the resistor. Does anyone have a service manual or circuit diagram for these speakers? Thanks much! Joe