24V Zener Diode for Beogram 4000 Power Supply Replacement ensures that the record

Replacement ensures that the record detectionj functionality works properly

which may disable the record detection function

See also this post on the Beolover Blog

simply reverse red and black wires on the solder terminals

24V Zener Diode for Beogram 4000 Power Supply Replacement ensures that the recordBeolover Motor and Reservoir Capacitor Kit for Beogram 4002 4: Replaces original 24V Zener diode of Beogram 4000. 3W high power Zener Original Zener diode is underdimensioned at only 1W. It tends to heat up and the spec voltage of 24V is exceeded. Replacement with modern 3W Zener ensures reliable 24V power. Should be replaced along with main capacitors. Installation requires soldering desoldering capability. Follow us on the Beolover Blog for updates