[alf]

Hi All,

still waiting for the Beoparts order…..in the meantime after some research I decided to replace the faulty 92PU51 transistor with a M BD 508 type which is working fine.

The motor control function is now fully restored and the Beogram is back in business

thanks to all interested members.

ALF

[alf]

Hi All,

Just a brief summary since I started that post regarding speed issues on my 4002 table.

replaced were the old speed trimmers with 25-turn Bourns trimmer, a modern speed-switching relay was installed and finally the DC platter motor received new bearing, which in the end settled the issue !!

all playing nicely again ? or should I say “beolovely” ?!

ALF

 

[alf]

Thank you for the info – part has been ordered 3 weeks ago – still waiting……!

ALf

[alf]

Thanks Mark,

i will take that on board (if I can find one!!!)

perth isn’t exactly a semiconductor hub.

ALF

 

[alf]

I guess I don’t  have to answer Q3 &Q4 ………

not something I suspected, but the shop sold me two 2 KOhm trimmers instead of

5 kOhm trimmers ??

too much trust is not often rewarded – now both speeds can be set and are in fact

set now.
The W/F is very minimal and will improve further after the DC motor has new bearings.

ALF

[alf]

My thoughts exactly, the motor should not run faster with a worn bearing !

running faster is not so much the problem because there are trimmer pots to adjust.

the issue is that I can not regulate sufficiently down the 33rpm speed – I can do that with the 45rpm speed though.

i only have one 45 single and can adjust that by ear as I know Bonos voice. To my ears

the speed sounds correct and steady.

the same applies to the 33rpm setting apart from the regulating down issue, which I seem unable to do…it is just a tick too fast, which I can see on a strobo disc and hear – I know McCartneys voice.

both trimmer pots are 5kOhm 25-turn Bourne trimmers.

Both 2R2 and 1R15 are on the edge of their range but it is still too fast spinning.

not sure if that is helping a diagnose ?

ALF

[alf]

Hi Lanola,

sounds like you need to fit new belts.

see Beoparts shop !

good luck

ALF

[alf]

Hi All,

I replaced IC 6104, readjusted the Focus Offset (=410mV), checked the laser current (=48mV) , replaced the drawer belt with an interims one until the original one will arrive.

so far the player works fine again, although I am not entirely sure what impact exactly

the new IC6104 caused ?!

For now ‘case closed’

ALF

[Author]

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