Beogram 8000: Initial Voltage Checks

Now that the required electrical work is done I am able to connect the Beogram 8000 components back together and see what the main voltages look like.

Here is the test set up I always use for Beogram 8000 and 8002 turntables. It is nice that every component I would need to get to is easily accessible for measuring.

Plugging in the power cord the Beogram standby light came on as expected.

Next I tested the 33 ⅓ RPM and 45 RPM speeds. The turntable speeds look like they are working but the bottom segments of the display is not working. Usually that indicates a problem with one of the 4.7nF capacitors on the microcomputer PCB. I will have to dig into that after these initial checks.

I observed one other functional problem I will have to investigate and that is with the record play. The tonearm moves to the start of a record but the fixed arm sensor is not detecting an empty platter.

Other than those two things the electronic functions look to be in good order.

On to the voltage checks for the Beogram power supply.  Here is the schematic for the power supply.

I checked the C24 capacitor on the main board for the voltage supplied to the Beogram +5 VDC regulator and the +5 VDC voltage at the microcomputer IC. Both measured good.

The C27 main board capacitor and +15 VDC supply voltage also look good.

So do the C29 main board capacitor and -15 VDC supply.

Overall good news on the electrical parts of this Beogram. Next I will look for the display segment problem and check the signals coming from the various sensors. That should point me to the culprit on the platter non-detection.