Hi ALF,

Was the LED in the tonearm on during both measurements?

Assuming it is, then 1TR6 is not being biased on properly and the only way for the LED to be on is for 1TR6 to be faulty. I'd pull it and test it.

Regards

Lonnie

Are we talking about the transport indicator arm LED ?

if YES, this LED only comes on at << or >> or 2xPlay flashing.....not during this particular meaurment !

i measured twice with ground from chassis and ground at minus of C27......in both cases the outcome is the same.

ALF

Hi Lonnie,

just answerd that....if we are talking about the transport indicator LED then the answer is no in both modes!

what is however on all the time is the bulb in the photo control part as power won’t be properly turned off.

i will test TR6 tomorrow, its getting late 😴

ALF

TR6 is fine.

Martin

Hi ALF, 

Sorry, I thought you were indicating that the LED in the arm was on all the time. Re-reading you post you clearly say servo bulb.

As Dillen indicated 1TR6 is fine so no need to remove and check.

Regards

Lonnie

So it sounds like this Beogram can go into a pseudo standby mode where the microcomputer thinks it is off, the standby LED is on but some things are actually still being powered - the servo light and the brake circuit. Maybe the microcomputer being in standby is causing it to ignore any platter rotation information coming in. The brake circuit is trying to brake without any feedback so it just keeps going and the platter is driven in reverse.

Check the ±15 V supply lines when the Beogram is in standby and when in play. 

Hi John,

i checked all +15 V / -15 V points

                                  STBY/STOP                 PLAY

TR19-C                      -17V                         Around -15V

P2 - 9                          15 V                             15V

TR15-E                        15V                             15V

P4-8/R46.                    15V                             15V

C8.                               15V.                            15V

TR30-C.                       15V.                            15V

TR29-C                       -17V.                          -16.5V

TR1/TR3-C.                 15V.                            15V

ALF

What about P3-4 ?

Sorry John, I missed that one:

P3-4:  StBy/Play = 14.9V 😕

ALF

That is the power for the servo sensor lamp. That should be off when in Standby. Tonight I opened the little black lid in the tonearm compartment of the Beogram 8002 in my office. The servo lamp is off when the Beogram is in Standby mode (which is how you would think it should function). If I press Turn or Play the servo lamp comes on. Pressing Stop returns to Standby and the servo lamp goes off.

Some signal(s) in your Beogram have the microcomputer and logic confused where part of the Beogram is in Standby mode and other parts are not. 

John