I presume that you have checked it is not set to Audio Option 0, whereupon it will not respond to a remote?

On a Beolink 1000 press STBY, SOUND, 1, STORE

Does the 9300 work with the remote work now???

I tried that with each remote but no response from the Beocenter. Beoworld doesn't have a service manual for the Beocenter 9300 specifically. There are service manuals for the Beocenter 9000 and 9500.  I have an original service manual for the 9500 which shows how to put the Beocenter into a test function mode. I wonder if the 9300 also has that feature? I'll remove the bottom glass and check.

After going through the Beocenter 9000 and 9500 service manuals I see that the 9300 IR board is different. So far I haven't had any luck tracking down a Beocenter 9300 service manual. I found a reprint of one for sale on Ebay from the UK but the shipping seems a little steep. I can go ahead and use the Beocenter as it is (without the remote).

What is that black discolouration by the silver capacitor? Is it leaking?

cozza wrote:

What is that black discolouration by the silver capacitor? Is it leaking?

The black marking on the side of the 22uF silver capacitor is a polarity marking (black is the negative side). The base of that capacitor is a black plastic material. It is a surface mount capacitor. Beoworld member Menahem already suggested replacing that cap with a new one. As I don't have a service manual for the BC 9300 yet I decided to go ahead and replace that capacitor. Unfortunately, it didn't fix the problem. I didn't have a surface mount capacitor and the smallest I had is as pictured here. I should receive a photo copy of the BC 9300 manual in about a week.

cozza wrote:

What is that black discolouration by the silver capacitor? Is it leaking?

Correction - On my posting of the replaced 22uF capacitor I think I see what your question was about. You are referring to the series of black spots between the 22uF capacitor and the SMD resistor. Yes, I was wondering about that too. Is that just discoloration from the manufacturing of the board or is it just age? Or is it a symptom of a problem there. Replacing the 22uF capacitor didn't fix the problem though and the trace side of the board doesn't show anything unusual.

I finally received a copy of a Beocenter 9300 service manual. The copy isn't too bad. Some of the images of the circuit boards could be better but it looks usable.

As it turns out, the Beocenter 9300 internal test mode doesn't test the IR section as the BC9500 does. The service manual does show the IR circuit board and shows what the what the board connections are. I will check power on the board (5V) and see what else I can measure.

I don't know if this is a valid test but here is what I tried today.

I pulled the IR Receiver PCB out of the BC9300. According to the service manual, the three pins on the single, board connector are
P49-1 : +5 VDC
P49-2 : Signal
P49-3 : GND

So I connected my +5 VDC power supply to P49-1 and 3 and my scope probe to P49-2.  Occasionally I saw some pulses on the P49-2 line but mostly it was quiet. I didn't see any activity on the scope when I pressed buttons on the remote control. With power on the IR board, should I be able see signal activity on P49-2 when I press buttons on the remote control? Since I didn't, it seems like the board is dead.