After hauling out my early AC-motor BeoGram 4002 from a year of storage, I discovered I'm only getting sporadic sound in one channel and nothing in the other. Found out that by tapping the relay board underneath the control panel I could get constant sound in the right channel, and isolated the problem to the plastic-covered mute relay. If I remove

The specific way the AV7000 works is to take over all IR commands from the audio master, and to control it through DataLink (AUX) and PowerLink. However PowerLink did not make an appearance until the 6500, so that's going to be the major problem with using the AV7000 with the 5000.

There was a third-party modification to allow discrete 5.1 in (through one of the two PowerLink ports) from DVD players which had separate line-level outputs for each channel, or an outboard DTS/DD decoder with the same. It would be rare, but not impossible, for you to have such a unit. Otherwise this is actually a Dolby Pro Logic matrix surround decoder

Why don't you send me a PM with your address and I'll put the little splitter in the mail to you so that you can try it out -- I'm not using the machine presently and would be glad to loan it to you if you'd like to examine it...

Yes, the displays pictured above are mine -- they were actually completely functional but I replaced the capacitors anyway as a preventative measure...

Just to be sure, you are attaching TEL to the BeoCom handset, ANS to the cable from the base, and OUT to your wallplate, right?

It could be a broken solder connection (dry joint) somewhere in the display assembly -- you can try inspecting the unit, which has two separable circuit boards. There are I believe two capacitors, either of which could be replaced: Since there are two boards, you could always try swapping 1/2 of one display with the other, to narrow down which part

Yes, clearly an error on my part! It's difficult to create a connection to one wire only. The revised chart looks like this: TEL 1 > OUT 4 TEL 2 > ANS 1 TEL 3 > ANS 4 TEL 4 > OUT 1 ANS 1 > TEL 2 ANS 2 > OUT 3 ANS 3 > OUT 2 ANS 4 > TEL 3 OUT 1 > TEL 4 OUT 2 > ANS 3 OUT 3 > ANS 2 OUT 4 > TEL 1

This is what I have so far... not guaranteed to be correct, but does this match anything (for example a two-line switching system) that people are familiar with? TEL 1 > OUT 4 TEL 2 > ANS 1 > OUT 4 TEL 3 > ANS 4 TEL 4 > OUT 1 ANS 1 > TEL 2 > OUT 4 ANS 2 > OUT 3 ANS 3 > OUT 2 ANS 4 > TEL 3 OUT 1 > TEL 4 OUT 2 > ANS 3 OUT 3 > ANS 2 OUT 4 > ANS 1 > TEL

OK, here is the pin layout we are dealing with: TEL 1 2 3 4 ANS 1 2 3 4 OUT 1 2 3 4 Testing to follow...