Topping d70s MQA dac troubleshooting.

[Andy74]

Looks very similar to Talema: https://talema.com/products/low-profile-pcb-mount-toroidal-transformers/

If you can match the pin layout and find out the VA and output voltage, they're not overly expensive: https://uk.rs-online.com/web/c/power-supplies-transformers/transformers/toroidal-transformers/?applied-dimensions=4294329366,4294874607

Yes I did see those transformers . But the pin location is different. The Talema ones seem to have 2 pins in each corner. The topping transformer in the PCB has no pins in one corner . Also the other pins are very different than the Talema. I may have to modify the PCB to fit the Talema even if I find out the correct output voltage specification. I don’t think I will find a willing hifi repairer to do that. And I am no expert in PCB and components.

 

[Count Arthur]

If you can't find a trasformer with the same pin positions, you could use one with leads, provided it will fit in the case: https://cpc.farnell.com/w/c/electro...ers?power-rating=15va|30va&product-range=mcfe

I'm guessing it will be somewhere around 15 to 30VA and likely 12 to 18V output, but you will need to find out the correct valies. If you can't find a transformer with dual 115V primarys, you could use one with a single 230V primary and remove the 115 - 230V selector switch to make it work.

In any case, if you're lucky and haven't messed up a whole bunch of other components, I think it's worth a go if you can do it yourself, or can find someone that won't charge too much to do it for you.

You could also try asking JohnYang, he works for Topping: https://www.audiosciencereview.com/forum/index.php?members/johnyang1997.5166/

 

[Roland68]

Looks very similar to Talema: https://talema.com/products/low-profile-pcb-mount-toroidal-transformers/

If you can match the pin layout and find out the VA and output voltage, they're not overly expensive: https://uk.rs-online.com/web/c/power-supplies-transformers/transformers/toroidal-transformers/?applied-dimensions=4294329366,4294874607

Talema only makes this type of transformer with 2 voltages, not 3 voltages.

 

[Count Arthur]

Talema only makes this type of transformer with 2 voltages, not 3 voltages.

Yes, unfortunately, if it has multiple output voltages it won't be available "off the shelf".

 

[Andy74]

I have shipped the unit to China. Let’s see what they say.

 

[Andy74]

If you can't find a trasformer with the same pin positions, you could use one with leads, provided it will fit in the case: https://cpc.farnell.com/w/c/electro...ers?power-rating=15va|30va&product-range=mcfe

I'm guessing it will be somewhere around 15 to 30VA and likely 12 to 18V output, but you will need to find out the correct valies. If you can't find a transformer with dual 115V primarys, you could use one with a single 230V primary and remove the 115 - 230V selector switch to make it work.

In any case, if you're lucky and haven't messed up a whole bunch of other components, I think it's worth a go if you can do it yourself, or can find someone that won't charge too much to do it for you.

You could also try asking JohnYang, he works for Topping: https://www.audiosciencereview.com/forum/index.php?members/johnyang1997.5166/

Hi
I shipped the unit to Topping, China. The replaced the transformer and diodes. This unit is back with me and working fine. Thanks for your input. Best wishes.