Hello forum, I’am looking for a schema or service manual for The Cayin Amp Venus VP-100i (or someone who did some backwards enginering).

 

There are quite a few Cayin models at hiFi Engine   https://www.hifiengine.com/manual_library/cayin.shtml

where you can place a request for a manual

 

You might though see the Cayin contact details   https://en.cayin.cn/contact/11/28.html

and request the information you require at their website. 

9 hours ago, stereo coffee said:

There are quite a few Cayin models at hiFi Engine   https://www.hifiengine.com/manual_library/cayin.shtml

where you can place a request for a manual

 

You might though see the Cayin contact details   https://en.cayin.cn/contact/11/28.html

and request the information you require at their website. 

Cayin does not give there service manuals away and hifiengine does not have the model I own on there site.

2 hours ago, Mmuetst said:

Cayin does not give there service manuals away and hifiengine does not have the model I own on there site.

You could post some images here, and explain the issue you have. Recommendations from other members for service /repair should be able to help you.  It's worth contacting Cayin anyway, your model might have a schematic that they can supply, ie if its an earlier model, or your issue is in one individual section of the schematic.  There is also a lot of general knowledge on the forum. 

On 11/10/2022 at 1:16 AM, stereo coffee said:

You could post some images here, and explain the issue you have. Recommendations from other members for service /repair should be able to help you.  It's worth contacting Cayin anyway, your model might have a schematic that they can supply, ie if its an earlier model, or your issue is in one individual section of the schematic.  There is also a lot of general knowledge on the forum. 

Hello Stereo coffee, thanks for your answer. At this moment there are no problems with the amplifier, I just want to know what the schematic of this amplifier looks like.  I Also want to check if the amplifier is original (I bought it second hand). I send an e-mail to Cayin (lets see whether they answer).

I know now that the schema of the amp is not original anymore.

The company Hay-End in the Netherlands modified The pre-amp of this Cayin. I draw the schema. He put two long tailed pairs one after the other. In the first long tailed pair he put a DC offset adjustment. 
I must check if all the values of the resistors are correct.