Rockford_622

Finally got around to getting my system up and running. Found out that the problem was the bad R27 resistor on the power supply board. Replaced it with 4 47 ohm 1/2 watt resistors in parallel (giving close to 10 ohms, which is what I believe is the correct resistor rating) and all it working again. Ptron, let me know if I can help you by measuring any voltages on my board.

Tim- I just got done fixing my Promedia 4.1's (bad R27 resistor on the power supply) and also had a CP-1 with a bad DIN plug on it. I took the cover off of my CP-1 and looked at the board and mine looks the same as yours, but not to the same degree. I think that may be some type of insulator to insulate the components from the board. Here is my CP1's board: How carefully have you inspected all the boards inside your amplifier for component damage? -Matt

Sorry to hear about your misfortune! Hopefully that is all you blew up.

It certaintly seems like it should be somewhere around 10 Ohms, but the real resistor looks as depicted in the picture. I can't really figure out how to get 10 Ohms from those bands. We are going to trace out the speaker output board where the voltage regulators are and see if we can find a problem on that board. It seems that something on that board is preventing my CP-1 from receiving 15 volts.

One of the guys on this board did email me and told me his R27 was 4.5 Ohms. Does this sound reasonable? I say yes, but from looking at my resistor, I can't imagine how I could get that value from those colored bands.

Not yet. We are able to get 32 v from the ribbon cable coming down from the power supply to the audio connection board, but as soon as we plug the ribbon cable into the board the voltage drops down to around 2 volts. We are thinking something is shorted on that board (the 630043 Rev 4 board) due to the extreme voltage drop when the cable is plugged back in. That would explain why my R27 resistor was open, it may have just burned up from the other board being shorted. We are focusing on the 3 voltage regulators, the 2 positive and the 1 negative on the 630043 board.

I believe they are Ferrite Beads. They are nothing more than coils of wire used to reduce interference. As long as they show continuity, they should be ok.

Yep, 10K does sound way too high, your right. We did replace the 6K resistor we had in there with a 600 (thinking that we were misreading the multiplier band) and I did get ~32 volts out of the power supply to the speaker terminal board. Thanks for the schematics, by the way. They are a great help!!

I have my 120V 4.1 system ripped apart at the moment. I don't see anything labeled FB1 on the BASH board, however. Diodes are usually labeled with a "D"

Thanks, I appreciate any help you can lend. If only Klipsch would give us the schematics I know they have...

You're right, you did say parallel []. My fault. I don't think we are misreading the R27 resistor. Here is a picture of it: It looks like the bands are Black, Blue, Orange, Gold which would indicate 6K ohms. It is totally open, which is strange considering it looks to be in decent condition. Thanks you in advance for the schematic! I think we are going to focus on testing the 3 voltage regulators (U2, U3, and U4) on the speaker terminal board next.

Thanks for the reply Ptron. Visually the 4.1 system and your v.2-400 system look the same, but it sounds like there are some differences. My power supply board is a 640014 rev 6 as well, but clearly does not have 2 resistors in series for the R27. I can't figure out how they can have 2 boards with the same number and rev, but with different component layouts. I did take a look at that thread you linked and I think it will help diagnose the problem with my set. It looks like you get 32v out of your power supply? Is this correct? We have replaced the 6K ohm resistor (or at least that is what it looks like) with 3 18k resistors in parallel (that is all we had laying around) and get a steady 2 volts out of the power supply. Not enough to illuminate the led on the control pod. If you could scan your schematic and send it to mattroush@mccgp.com that would be great!

Long story short, my 4.1 do not work at all. The CP-1 is new (just got that replaced) and the LED on that pod does not illuminate due to the DIN plug not outputting +15 VDC. The fuse is not blown and the power supply board has around 160 VDC coming into it. The BASH board has around 56 VDC going into it, but the power supply only outputs around 2 VDC. The R27 resistor on the power supply board was open, but no signs of damage. We think the value is 6K ohms, but the markings are really hard to make out. Does anyone know the correct value for this resistor? Better yet, does anyone have a schematic of the power supply board? Does anyone know the correct voltage the power supply should output? -Matt