If your Beo4 has no control maybe you connected pins 2 and 5 as the pin description is from the side of wiring. Nevertheless you may try to switch into A.OPT 1 on your Beo4 by pressing Off + LIST then go to Option choose A.Opt and press 1. You should see LED blinked once on BS9000 meaning that it had switched into that option

Pin 2-4 for the plug.

But try first whether it responds to the A-opt 1 instruction. The led has to blink once with or without the powerlink used.

Programming the A-option gives you instantly the status about the IR-receiver. These receivers fails often.

Thanks all!

Idiot trouble I'm afraid.....

Shorting plug wasn't properly seated. Rather sad as I'm from UK and have owned B&O equipment using DINs since I bought my first Beolit in the very early 70's. 

Anyway the good news is that the remote will switch between CD & Radio and power off, so it's working. 

I then got it into testmode

Per 

duplicate deleted.

For TM73 you need a working/playing cd.

Start by carefully cleaning the lens. 

Beobuddy, thank you.

I cleaned the lens with a just opened alcohol impregnated lens cleaning wipe, wrapped round a Qtip (cotton bud)

I then loaded in slot 2 a CD that looks good and does play on my Beosound 2000 - that CD player is a good CD quality test.

After I did that, the CD mechanism clicked softly 2 or 3 times and started to spin clockwise not very fast for a second or so then started spinnig very fast anti clockwise for about 5 seconds before it stopped. It did not play. When spinning it was very noisy. 

I repeated that on several different CDs in different positions.

I then went into TESTMODE.

Note that I could only get into TESTMODE with standby selected and being in TESTMODE seemed to mean I have to go through the AOPT 1 sequence again on the Boe4

TM 73 ran, with the same behavior - spin clockwise then anti-clockwise. At the end of the test, it displayed CD Error 7.

I repeated this several times and got CD Error 3 and CD Error 2 on every other test apart from the first. Most times the CD would spin, in one direction or both, some times not at all and the error would appear after 4 soft clicks. 

Also I repeated TM 71 a few times. Most times it ended with OK, twice it ended with going into standby when it was at position 3.

CD Error 3 is lack of tracking, while Error 2 is lack of focusing. Please see a sticker on mechanism for laser type description and look for a replacement on Ebay. Generally the whole mechanism doesn't have to be replaced just the laser alone. It's not a big deal with replacement, worse is that (as heard on this forum) not every new laser works.

Keep in mind what you are doing. 

You're executing tests which are normally done at the end of a service or repair. 

Your BS9000 obviously doesn’t play cd’s in the first place. 

So, you need that sorted first. Another laser pickup could be the solution. 

Clean the testmode memory, try to play the cd. Look at stored error codes  in the memory again. 

Ok, sorry to hear that.

testmode 73 is for laser Findling focus on cd.

you can try to clean the laser lens, but i‘m really sure you habe to change the Laser.

after replacing the laser you have  to run both testmodes again.

if you need further help. Feel free to ask.

Schletti82 wrote:

testmode 73 is for laser Findling focus on cd.

It’s meant to adjust the APS. The Automatic Position System  

It calibrates the optical sensor in combination with the disc located on top of the cd.

This system sets the cd’s back the way they were taken. It requires a working lasermechanism to function properly  

That it shows an error is an extra advantage.