[hcraig244]

Ok….after almost an entire day chasing my tail in completing various adjustments to the pick up arm and the photo control aperture…..all of which where looking good until I fitted a cartridge and (with P4 plug removed to allow hand control) and tried to rotate the platter and view the drive motor revolutions….everything went to rat shit!….pick up arm skating around randomly…at this point I removed the cartridge and replaced it with the one I fitted to the working 8002….and everything settled down….now its looking good, which is more than can be said for the cartridge….on close inspection neither is in good shape, the functioning one seems to have a loose cantilever despite still funcioning. I think they can be re-tipped but I’m not sure….non the less I will now move onto the third and what is possibly the most challenging of the three.

• This reply was modified 3 weeks, 1 day ago by hcraig244.

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[hcraig244]

Right…adjustment made and now the carriage starts to move inward when the tone arm is nudged slightly inward…..however we’re not out of the woods yet, the carriage moves inward only when nudged but doesn’t do so in a sufficient number of steps…I read in one of Rudi’s blogs that the motor should turn partially every revolution of the platter, this platter is going around maybe 5 or six times before the motor turns to catch the carriage up and then it starts to turn to many times and the tone arm skates across the disc alarmingly…..it’s like the signal to stop the motor turning when the aperture should be closing isn’t happening…..I’m suspecting an alignment issue somewhere on the mechanism…..oh joy!

• This reply was modified 3 weeks, 1 day ago by hcraig244.

[hcraig244]

Ok

Back in the service position, motor drive belt looks in good shape with no signs of slipping, nice and taught…no cartridge fitted and play pressed….carriage moves to the drop area, solenoid engages and the tone arm drops….carriage starts to move inward in a quite determined manner…tried stopping ad starting a couple of times and the same thing occurs my view is that it should wait until the aperture allows more light onto the photo sensor and move to decrease said light…..to confirm this I opened up the fully functional deck and carried out the same check…and as expected the tone arm dropped upon reaching the drop area and stayed stationary until I  nudged it forward slightly and it moved inward very slowly, more slowly than the faulty unit.

Therefore my question to the forum (you really Mark) is should I carry out an aperture adjustment…and if so do I really need a testing record as per the service manual….or is it best to wait until I have replaced all old capacitors then check once more before making said adjustments

Best Regards Craig

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Mark

Thank you for that information, we now know the muting relay coil is good, I’m going to take a closer look at the tone arm drive motor to ensure all is good mechanically, It could be the belt is slipping but I’m not sure….visually it looked good…if the deck has been dormant for some years it could be a lubrication issue also….following that I will measure the voltage to the motor, it should be possible to check the motor with the drive belt removed to check its response independantly?

Craig

[hcraig244]

Put everything back into service mode and with a cartridge fitted and a disc on the platter powered it up. The tone arm dropped at the correct place….result, however the tone arm isn’t traveling inward as the stylus moves inward, I’m hoping it’s nothing more that a slipping belt….will have to put everything back into service position and take a look…..oh and the buzz is ever present

 

 

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[hcraig244]

following a thorough examination I failed to find a break, reflowed the solder connections on all four connection points and now the solenoid energises and the tone arm drops…..dont know which solder joint was responsible 😐

[hcraig244]

Looks like I’m losing my 5.0v to the solenoid coil somewhere along the flexi strip….

[hcraig244]

Circuit diagram tells me that this coil is fed from pins 1&7 of P3…..white and black, repeated the test and on hearing the click described above I measured 5.0 vdc at the connections to the flexi strip…

 

• This reply was modified 3 weeks, 3 days ago by hcraig244.

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[hcraig244]

This done pressed play, and following a look at the circuit diagram, located the connections for the solenoid responsible for lowering the tone arm….waited until the arm moved to the drop position, I can hear what I think is  a relay energising, will look further into that, and took a measurement at the solenoid coil connections…. nothing.

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[hcraig244]

Ok…..the unit with the tone arm that doesn’t drop first up! removed the dust cover and put the unit into service position

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[hcraig244]

Beogram 8002

Thank you or your response, you identify some solid starting points to get to the bottom of the issues I have described…I will be addressing the issues for each 8002 in turn, probably starting with the one whose tone arm moves to the correct position but refuses to drop, as you suggest I’m hoping for a mechanical problem…I do hear what I believe to be the solenoid  clicking in prior to the tone arm doing nothing….with the exception of the grounding hum I do have a fully functioning set which is always useful for comparison checks.

Regards Craig

 

[hcraig244]

Mark

Thank you for your response to the above issues, I’m confident your correct in your assessment of the suitability of the existing cable. See below Dillens advice which is very much aligned with yours:

Beogram 8002 requires a double-shielded signal cable (PH).if you are using a cable meant for a Beocord (TP), you will almost certainly get hum.If you are using the correct PH cable, the problem could be a broken ground connection at, or near, the DIN Socket board in the Beogram or inside one end of the cable. At least that would be the first things to check.

I will be contacting Steve of Heavenly Sounds for a price and delivery of a suitable cable over this weekend.

Thanks again for your support

Craig

• This reply was modified 3 weeks, 3 days ago by hcraig244.

[hcraig244]

So there we have the project in summary:

1 BG4000 in working order with some work on the dust cover trim

1 BG8002 in working order with a suspected ground hum/buzz going on

1 BG8002 mostly in working order, the buzz/hum is present here too, with the exception no tone arm drop, I’m suspecting something mechanical,

1 BG8002 with operational issues around the tone arm movement and possibly drop..the tone arm cover is loose so im suspecting it may have been looked at in the past.

As always any suggestions will be welcomed along with encouragement of course ;¬)

 

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[hcraig244]

3rd BG8002 on the bench…powers up fine and all lights illuminate when play is pressed, platter spins and tone are begins to move to the drop area when it stops short and stays there, wont stop and needs to be moved back by the reverse button at which point all goes back to standby….dont know if the buzz/hum is present?

 

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[hcraig244]

On checking the output cable provided by the owner i see its a 5 pin DIN to phone plugs….the DIN socket on the deck is a 7 pin…the service manual suggests a number of earth/ground connections are not getting picked up by the amps I am connecting too….

[hcraig244]

Second BG8002 up for testing complete with platter and cartridge….all visual inspected fine, powered up and still looking good….however the tone arm refused to drop when asked….tried a couple of times to no avail, interestingly the hum/buss that I suspect is a grounding thing presents itself when the tone arm is asked to drop….I’m seeing a trend here

 

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[hcraig244]

First one up fitted with platter and cartridge, powered up via variac and came up nicely…nothing untoward so went ahead and connected up to a BM6000 and although the sound came through on both channels there is an overriding hum that sounds very like a grounding issue…..tried with a BM3000 and also a Beolab5000 and the hum remains…..

 

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[hcraig244]

I have been awaiting delivery of platters and cartridges for these three decks in order to determine status prior to ordering the required parts from Dillen, didnt want to order kits and then discover additional parts where required due to an unknown fault…saves shipping costs to buy everything in one go ;¬)

Platters and cartridges arrived yesterday so will be inspecting the first one today

[hcraig244]

I’m thinking all further pics will need to be via attachments as the definition is superior….next up for inspection the first of the BG8002 decks

 

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[hcraig244]

With no fault finding/repairs required, good news, a kit to include all the usual caps and trimmers along with drive belts will be ordered from Dillen and a straight forward replacement carried out…..the trim will need attention, it has been repaired once before but needs a little more work

 

 

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