Can anyone identify this diode?

[roger2]

This capacitor-diode series combination is from a Sherwood RX-4010R receiver that I am recapping. I believe this Sherwood was manufactured sometime around 1993. Apparently these parts were a factory change that was added on (the cap is the same type used throughout the unit). The parts are undocumented, they do not appear anywhere in the Service Manual.

The diode has the marking " Z3.3" on its body. So I would assume it is a 3.3 volt zener. But the way it is used in circuit, it makes no sense to me that a zener was needed.

Is there any way that the "Z3.3" marking might possibly NOT indicate that it is a 3.3v zener? I just want to replace both parts with original equivalents.

Thank in advance...

 

[Refugee1]

Use a power supply between 5V and 12V with a series resistor between 200 ohms and 1K ohms.
Connect a DMM across the diode and dab the power supply with the resistor in series across it both ways.
If it is a zena it will read 3.3 volts one way and 0.5 volts the other way.

 

[roger2]

Good idea Refugee1. But I have no power supply.

 

[63781]

Try a 9V battery….
But yes - that is a Zener diode, most likely 3.3 V

 

[roger2]

Thanks @StigErik. I will try the battery. What value resistor would you suggest?

 

[63781]

1k should be fine.

 

[Refugee1]

Just be careful not to tough the diode directly across the battery.
It will never work again if you do.