ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Well, hope not beging of WW3, but BG8000 thread
Startpoint
soon...:
Hey, look! No tools! Yet
blah-blah and photographs as needed
Nasty suprise if plugged in. Loose metalplate, whats it for...??
No supporting rod like in 59XX series
But luckily I have Europa
How to disasseble tis...
and tat....
Ah, transformer goes up, and board is off the hooks.
And by one screw...
This was a bit difficult
But it gave up
Smells like recapping
All stripped
Not burnt, but dusty
Intresting switch in panel
Remains me about BM1900 series volume control, same designer?
Compared to 59XX, this is almost like heavy industry
And downunder
Indicator ready to rebulbed
I wonder why R1 is here called "photo element" and elsewhere "photoresistor"? What is the difference between?
Recapped
Ouch, indicator signal dissapears to somewhere here
Changed transistor, and signal comes through and platter ribs are seen
Still it wont regonice edge of disk, what is wrong?
Could you be more specific? Does it go all the way to the end of side? What does it do then?
By the way, have you yet checked this setting?
Jacques
Today back by the bench again.
Hi Jaques. Yes I did adjust them.
If I just ress play, it goes right to the end, and I bet it likes to go over if could. However, if there is a singe on platter and go back to rib area, press play, it founds edge allright.
Thinking, thinking....
Okay but does it play the EP disc?
Is the SO switch present and correctly mounted?
Does the sensor counter circuit work? The IR diode is fragile and can go belly-up. If the processor doesn't see a certain number of pulses (the Beogram 8000 counts everything!) from the arm carriage screw tacho (motor side) it won't stop. Check this circuit.
The platter ribs are there for no disc or EP/45RPM only so that works.
What I did:
Oh yes, it does play small ones.(singles)
I check that counter sensor works, but havent check it any deeper, will check tomorrow.
SO switch? Switch Off? It works.
Mechanically this looks more simple if compared to 59xx, but no wonder if it counts it's way.
Just tought, is this working by contrast difference and thus by edge, not by level, of signal from indicator arm? If so, maybe it just do not get clear enough signal without topplate?
It works fine when it is in service position. Try with a 25 cm record I'm sure it will work too. Have you checked with a camera that the it diode works?
Npe, just output from detector diodes
So you see the pulses? Does it count?
Yes, I see, no problem.
How it should behave? When I press Play and there is not disk? Mine seems to be happy to go all the way to end and beyond. Also it do not return after disk is at the end.
When it plays, it works as it should.
When there is no record, it goes straight to the end stop and comes back to an end.
Does the bulb at the end of the detector arms lights up when play is pressed? (not the red light, the one under the arm..). I had somewhat a similar intermittent behaviour in the past: when that bulb is off and no record is present, it acts the same way as in your description: the carriage goes forward forever... in my case, the failure was caused by a cracked solder joint somewhere (if I remember correctly) on the P3 connector...
The same thing happens if the IR light of the OPE1 (near the carriage motor) is dead... but it does not seem to be your case...
Hi
Yes, it has new bulb.
When I drive arm at edge of platter there is a clear voltage change between platter and non platter, but if there is a record on platter, no noticeable change. Do this count where edge should be rather than detecting it? Is there anywhere flow/timing chart for this?
I'm afraid, next thing is μP...
And schemas I have are somewhat different than actual player.
Another thought...
Could it be that one of the two phototransistor in the OPE1 has failed? I don't clearly understand how they function but I think that they allow the machine to count forward and backward. I think it's well documented in the technical manual for the beomaster 8000: the volume encoding wheel and tuning wheel operates in the same manner (I think..)
Anyways... If one has failed that would explain:
-That the machine receives only half the pulses it receives when operating properly, so it counts the position of a 12', 2.5' later (to the position of a 7'), thus the effective drop of the tonearm for a single.
-That the arm does not return at the end: it has not finished counting when it reaches the end so it does not come back....
One thing for sure: if the IR led in OPE1 fails, then the carriage would go forward forever, record or not... I think that the detector arm has to see the ribs of the platters (or not) AND it has to count...
Guillaume
Yes , it has two phototr's to know direction. They both do produce nice wawe, so I think they are ok. And if, while single is on platter, play is pressed while arm is on top of platter outside of record, it finds edge, and knows how long beyond that it has to go to get needle also on top of record > counting is ok, in that case anyway.
So is there a problem to see edge of LP? As there is not noticeable change when passing over it, I think there should be as above on singles case....
Continuing testing...
mmm, first lesson forgotten, Take enough time to check and double check.
You people were right on right tracks, second counter do work ok, but didn't survive through op.amp. So change LM324 and, voila, counting reaches the μP.
So, it counts it's place with double detector at end of saft, and detector arm is only to see if there is record or not.
Now, should it move fast to edge of record and slow down before stop?
Yes that's how mine behaves.
Good work!
Thanks, it seems that I have to clean motor itself also. It is a bit difficult to it to move slowly.
On the other hand...
it looks so tight packet... I'm not going to mess with it.
Cleaning rails with proper grease and good new belt will do.
And here she is, playing happily Lee Clayton.
Nice! Now what cartridge do you use?
At the moment there is 20S, but I have few 20EN's to try.
(oops, isn't that dirty record on pic....)
Then you will only get a glimpse of what the deck is capable of: you really need a 20CL or a Soundsmith cartridge!
This combination made me give up on lesser Thorenses (TD160 et al) and Rega'd Technics SL1200MkII.
Good job Orava, and you woke up my virus again, but I will resist, no more buys before all my waiting items are up and running.
Collecting Vintage B&O is not a hobby, its a lifestyle.
But it is quite intresting player, belive me
Or did you mean 20CL?
Congrats on resurrecting this fabulous machine!...The MMC 20CL is known to be the best cartridge that B&O ever produced. I agree with Jacques that this turntable deserves it if you can afford it.. But it's pretty expensive on the used market... In comparison, the 20S is completely at the opposite on the quality level. But hey! it's best than having no pickup at all!... (I have a MMC 10E on my beogram 4002 and I think it's decent anyway...( a mmc 20 EN would satisfy me though..)
When I got my beogram 8000, I thought it was a pretty boring machine compared to the 4000 series, But with time it has became one of my favourite B&O piece: It screams the 80's and it operates more smoothly than the 4002 (or at least my 4002 (less kling! klang!)). The tengential drive is fabulous: when stopped, the platter even brakes. And the repeat function, although somewhat useless, should have been a pretty big Wow! factor back at the beginning of the 80's (It impresses all my friends, at least..)
I wonder how it would have looked like if it would have been designed out of the Beolab 8000 system. Would the angled lid have been kept? Or would they still have kept the arms out of view under an aluminium panel?
Orava: But it is quite intresting player, belive me Or did you mean 20CL?
I would love to have the player (and the 20CL), But then I will have to have the BM too, and then speakers that fit, maybe next year. Or the year after.
hamacbleu: ... When I got my beogram 8000, I thought it was a pretty boring machine compared to the 4000 series, But with time it has became one of my favourite B&O piece: It screams the 80's and it operates more smoothly than the 4002 (or at least my 4002 (less kling! klang!)). The tengential drive is fabulous: when stopped, the platter even brakes. And the repeat function, although somewhat useless, should have been a pretty big Wow! factor back at the beginning of the 80's (It impresses all my friends, at least..) I wonder how it would have looked like if it would have been designed out of the Beolab 8000 system. Would the angled lid have been kept? Or would they still have kept the arms out of view under an aluminium panel? Guillaume
...
Thanks. Exactly same impressions, I have two 400x waiting to be refurbed, and in lookwise they are a bit more intresting. Have to see what happens.
8000 Is intresting techwise, and after all suprisingly simple, compared to 59xx series, mainly because electronics drives and stears, not sprocets.
Søren Mexico: I would love to have the player (and the 20CL), But then I will have to have the BM too, and then speakers that fit, maybe next year. Or the year after.
Exactly. You'll also need the Beocord 9000, yet another must-have. This never ends.
I don't like the cog-and-wheel mechanisms of later - and final - Beograms either. I do have a 5005 and am not impressed at all. The bearing is just ridiculous, and it breathes cost-cutting!
And yes the 4000 series are noisy in operation!
chartz: And yes the 4000 series are noisy in operation!
Ear muffs on a list !
How do you clean stylus safely in this?
Orava: How do you clean stylus safely in this?
Here