HI everyone,
I am trying to fix a Marantz SR-810 receiver. The receiver apart from other issues also has a blown diode which was so bad it was no longer possible to identify. Also not able to find a service manual for the SR-810. However I did find a service manual for an SR-1000 and it seems to be very similar build looking at pictures of the internals. The service manual suggests that the zener diode that is blown in my unit is a BZ-140 which google tells me is a 14V 1W zener diode.
What would be a suitable replacement as this diode is no longer manufactured?
From what I know about diodes, it will have to be 14V and at least 1W. Higher power rating is fine provided it fits physically. Any suggestions?
Cheers guys and ladies.
I am trying to fix a Marantz SR-810 receiver. The receiver apart from other issues also has a blown diode which was so bad it was no longer possible to identify. Also not able to find a service manual for the SR-810. However I did find a service manual for an SR-1000 and it seems to be very similar build looking at pictures of the internals. The service manual suggests that the zener diode that is blown in my unit is a BZ-140 which google tells me is a 14V 1W zener diode.
What would be a suitable replacement as this diode is no longer manufactured?
From what I know about diodes, it will have to be 14V and at least 1W. Higher power rating is fine provided it fits physically. Any suggestions?
Cheers guys and ladies.
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1N5351B - Zener Single Diode, 14 V, 5 W, DO-201AE
1N4743A - Zener Single Diode, 14 V, 1 W, DO-41
Thanks Rayma. Is it just the voltage and wattage that is important or did you make a recommendation based on other characteristics of the BZ-140? What else matters? Thanks again
Use the 1N4743. Remember that in most cases zeners are shunt regulators, not series. You have to drag more current through a 5W zener for it to regulate well. If you replace that 1W zener with a 5w you may see poorer regulation of the supply.
Yeah thanks for the advice guys. I will use the 1N4743. Yes something blew the diode AND the fuse...I am learning so will see if there is anything else I can find faulty that took them both out. Thanks again.
Just noticed, the 1N4743 is a 13v zener. The original seems to be a 14v. Won't that be an issue?
Uuse a 1N47xx or equivalent, I assumed the voltage was right when you presented the number. Use the right voltage. Find a 1 watt 14v zener of whatever number.
I guess if you can only find 1.5 watt it would have to do.
I guess if you can only find 1.5 watt it would have to do.
Thanks rayma but arrow has no stock, digikey don't know about it, mouser don't know about it, nothing on ebay. Exists on that pdf only 🙂
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