Well, I have never known such a troublsome unit before lol... I hope you replaced that trimmer, in fact might as well do the lot for what they cost, apart from the radio module. Seems you need to investigate the volume board however....

Regarding your tentative approach to power up you must be carefull here as things might not operate as they are supposed to, which gives missleading results.Use the thing wisely but IMO you shouldn't rely on it when testing unless there is an obvious loading problem! With concern to noload / offset just set those trimmers to mid position and be ready with the meter attached, no speakers, RECIEVER COLD no input and screwdriver in hand.. it will be out but not to a point that the amp is going to self destruct!

This is like a good crime novel, waiting for the clue, exelent job John

A Tom Clancy novel, this one!

I'm not out of the woods with this one yet. That's why I said I wasn't going to celebrate too much.

I tested it playing some music for a bit more last night and the receiver would randomly go into standby mode.  So something is unstable...and probably in the power supply I think.  Remember when I adjusted the 6.5v output I decided to adjust the trimmer to set the base of 16TR1 to 3.8V.  That resulted in the output being 7.02V instead of 6.5V.  The unit worked but later (and now) is unstable.

This morning I went in and decided to adjust the trimmer to back the output back to 6.5V.  When I plugged the Beomaster in, it went right into the original fault state with only "P" on the display.  Leaving it in that state I adjusted the trimmer to lower the 6.5V power supply output down from the 7.02V to 6.5V and the Beomaster clicked back into standby.  Unfortunately, it now randomly clicks back to the fault state.  So I believe I thave some unstable component in the path from the power supply module (16) through the motor control (06) and the microcomputer (02) ...still.

But that explains the original problem. When I first put the unit back together after the recap it would only go into the "P" mode. Had I known what I know how I would have looked at the 6.5V out of the power supply first.  Instead I took out the 02 board, spent a bunch of time messing with the timing circuit (when it was probably perfectly fine).  That also cost me the lamps for the volume control.  Eventually I found my way to the power supply and resoldered the components (also checking them).  That helped with the problem and I am now in the position where I am now - unstable power supply.  I will go ahead and replace the trimmers I guess.  The trimmer that adjusts the 6.5V output seems very steady though. As I said, when I checked the 6.5V output this morning it was still at the 7.02V where I left it. It also smoothly lowered the voltage as I turned the trimmer.

I also have the problem I observed where the frequency counter is unstable. I found out that those LS chips require a +5v power signal that is with 5%.  I also know from the earlier testing that those chips were not on and keeping the Beomaster in "P" mode when the power supply voltage was too high. It would be good to determine what the source of this instability is.

Some additional information now...(I think this is going to take a while)

I flipped the cover up and opened the back metal cover on the 02 microcomputer board.  I attached a test lead to the +5V that supplies voltage to the counter chips.  I turned the Beomaster on and it came up in "P" mode then clicked into standby mode.  I couldn't get a measurement at that point with my DVM (I'll have to use the scope later). While in standby mode I measure 5.12V at the test point which is good. I could put the Beomaster in the various operations - tuner, PH, TP1 and TP2.  All the while it measured the same on the DVM.  Then, it just clicked into the "P" fail mode.  I say click because I hear a click in the Beomaster when it does that.  The voltage on the test point stayed in range though - +5.02V.  I need to check the power supply for the processor next although in the past it was always at +5V.  Something is clicking on and off when the problem occurs though so I need to find that and whatever signal is toggling the unit.

What you are hearing is the relay that switches the power to the amplifier. This is switched from a transistor on the volume control board which in turn is switched from the processor standby line. If the processor is not working correctly then I would ignore this click as it is a result of the fault not the cause.

When this P is displayed check the 6.5v supply line and again when things are working normally. If the thing is going into standby this might be an amp issue again disconect to minimise other problem areas.

I would forget about teh 5v line for now this is very unlikely to be a problem as well!

You are referring to the Output Amp (09 Module), right?  On that board I replaced the electrolytics and the trimmers for idle and offset. I'll start looking at the voltages there next. 

One of the original problems with this receiver when I got it was that it would play for a while then shutdown.  The shutdown was such that it did not go into standby. It just completely powered off and would not power back on.  Even disconnecting the power plug for a while and back in wouldn't revive it.  When I started working on it I discovered it came back to life when I brought power up slowly with the variac.  It is sounding like the problem I have now might be related.  Three electrolytic caps on the 09 board had measured bad and if you look back at the pictures on page one of this thread you can see some discoloration on the board from heat.

Wow. It almost looks like a miracle that mine should work at all. I'm looking at it with a worried eye... 

I can't help on this one, sorry about that, but I'm looking forward to the conclusion!

PS: It seems that I haven't received any notification for some time, although subscription is 'on'.

I think a recap on yours would be pretty smooth.  You have one that is working good already.  The one I have was given to me along with a Beogram CDX for $25 ... with the understanding that the CDX had the hinge problem and that the Beomaster 6000 did not work.  When I got it home and tested it on my dim bulb/variac tester the power came on and it was working.  The controls were scratchy and the tuner frequency display was stuck but it drove a pair of RL 140 speakers okay.  I used it like that for a while after ordering update parts from Dillen.  Then one day it just shut down while playing.  So I think this unit had some pre-existing problems that I am now able to get to.  It definately isn't just a recap task.  I'm not complaining though.  The price was right and while a little frustrating at times, I kind of enjoy restoring a unit like this....providing the final result will be a receiver I can use.  Except for the processor chip and displays I think replacement parts for the other components can be found.  I am tempted to take a break and refoam the woofers on my MC120.2 speakers. I've never listened to them so I am getting anxious to get that task done too.  But, I'll keep plugging along on the Beomaster until it's fixed or have to wait on a part.

Like I said Sonavor, disconnect the amp power plug for now and get the reciever running in a stable manner, then you can reconnect the amplifier and sort any further problems out that then arrise.

You are doing well. Might not harm to have a night off though!!!