I've blown a zener diode in my car CD Changer and having difficulty working out the breakdown voltage. It is a low wattage glass bead type (almost spherical) and appears to be marked with a 6 in the vertical orientation (right way up with the leads vertical) and a 2 orientated at 90 degrees to the 6. Is it 6.2V?
The design uses a single power transistor for regulation and this zener seems to set the output voltage. There is an IC that controls the motors that is rated at 12V so I'm tempted to put a 6.2 in and see what happens, but there are also some LSI chips on the board that are rated at 5.5 to 3.3V and if I blow those then the unit is scrap. There are some other zeners lurking on the board so maybe they drop the voltage further for the LSI chips.
The design uses a single power transistor for regulation and this zener seems to set the output voltage. There is an IC that controls the motors that is rated at 12V so I'm tempted to put a 6.2 in and see what happens, but there are also some LSI chips on the board that are rated at 5.5 to 3.3V and if I blow those then the unit is scrap. There are some other zeners lurking on the board so maybe they drop the voltage further for the LSI chips.