[george a]

Hi Martin

Main board has not been rebuilt YET……..

I have been trying to establish just what is needing attention as the person I bought it off could not get it going at all………

so far cleaning contacts / plugs etc has made the most difference .  at this point the only problem is the arm return  and a blown globe on the 45 speed dial…

I suppose i am trying to avoid a pcb rebuild but think it is required in near future….it is nearly 50 yrs old………and the lid is a mess with broken hinge points

Cheers

George

 

[george a]

Hi Martin

No the carraige doesnt seem to hit anything…when the stylus is in the end groove next to the label, the arm is still parallel to the sensor arm….and the carraige motor has stopped turning.

If i move the stylus to over the label the motor will trigger again until the end stop is triggered.

George

[george a]

Hi Glitch

Thanks for the  suggestion

I have tried it and the arm IS raised when the end stop switch is triggered….so that at least is good.

I estimate that i would need to insert a 5mm or so spacer to trigger the return at the correct point..:(

I would has expected that the arm return is triggered optically rather than mechanically…so there may still be an issue though…

Also the arm return has now happened a couple of times by itself  half way through a disk side….hmmm

Thanks for your interest

Cheers

George

 

 

[george a]

Hi Martin

 

It is a BG 4002/ 5221

the plastic ruler is the newer type which already has additional markings for the opto sensor ..

please see photo for position of carriage with respect to the end switch- see it seems to stop short when stylus is at innermost of lead-out groove.

I know the carriage activates the switch if stylus is up so it can go past the end of lead out groove- but if the stylus is down and switch is activated – does the stylus arm lift before returning across record – I am afraid it may destroy stylus by arm returning whilst stylus is still down..

thanks in advance for any advice

George

[george a]

Hi All

 

i pulled out the pcb’s and sprayed all connections / pins etc with contact cleaner

-SHE LIVES!!

 

All required now (hopefully ) is a general clean and following issues

a) speed indicator lamp relay etc- 33 not lighting up  45 (45 is lighting up)- both globes measure ok..

b)  adjust Arm position sensor so grooves are tracked more accurately – at this time the pickup arm needs to move excessive distance for carriage motor to activate..

c) General lube

d) Lid repair and polish (big job- may look at making a new one in clear acrylic

e)replace cartridge

some measure of relief now

Thanks to those who have offered comments

George

[george a]

And further discovery..

my BG4002 5521   seems to have an output board from a BG4004 5526…? underneath control switch panel

I wonder what effect this would have..???

[george a]

Just to add further inof The carriage motor has a constant 18v applied to it when the turntable is plugged into the wall and power is available..

Any ideas

 

TIA

George

[george a]

thanks Auric

 

Will have a look through–  lots of good stuff there..

After further investigation I ma suspecting that a total recap of the control board may be required…..

Cheers and thanks

George

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