Zener diode replacement for W03C

[Bob M.]

Hi all,
I've got a TS-9 Tube screamer. The zener diode, which I have to replace, in the power supply is part number W03C but it's listed as obsolete at most part houses. Is there a replacement or substitute for this diode. I think it's there so you cannot hook up an adaptor (wall wart) backwards to the circuit and damage the pedal. it's a 9 volt circuit, battery or wall adapter. Any recommendations are appreciated.
Thanks,
Bob M.

[g1]

I think it may be just a regular rectifier diode (reverse biased)? Do you have the right schematic for your version that you could post?

[Helmholtz]

The only zener is in the switching circuit (RD4.7EB). W03C is a standard 1A rectifier diode (used for wrong polarity protection at the power supply input).
https://www.datasheets360.com/pdf/4885999905650181930

You can use a 1N400x (the x standing for 1...7).

[Jazz P Bass]

Here is the TS-9 schematic.
Yeah, the W03C is just a reverse protection diode.

[Helmholtz]

BTW, this "protection" diode is a very bad solution. While it mostly protects the unit's electronics against wrong supply polarity, it shorts the power supply and may kill it.
A much better solution is to wire a Schottky diode in series with the positive supply input.

[vintagekiki]

https://www.tonehome.de/app/download/8039214/Ibanez_TS808sbfi_servicemanual.pdf

https://www.tonehome.de/app/download/8039226/Ibanez_TS808_Schematics.jpg