HK870 Amplifier section may have blown outputs or blows fuse!
This is the case of a customer complaint ...
These days outputs are scarce and when available, they come at a premium price. Do I want to take a chance blowing or shorting my new transistors just by replacing them and see what happens?? No!
Since mid 1980's my instruction to my technicians have always been, make sure the amplifier driver stage all the way to its input stage (differential is any) is working good without installing output transistors. That understanding among the early days technicians and service engineers still holds true, just as anyone here agrees that the first order of business in any electronics repair is to make sure all essential power supplies are working properly.
In order to verify and troubleshoot the HK870 amplifier section, one needs to take some simple step. Here it is!
If you have any suggestion, I would like to hear it.
This is the case of a customer complaint ...
These days outputs are scarce and when available, they come at a premium price. Do I want to take a chance blowing or shorting my new transistors just by replacing them and see what happens?? No!
Since mid 1980's my instruction to my technicians have always been, make sure the amplifier driver stage all the way to its input stage (differential is any) is working good without installing output transistors. That understanding among the early days technicians and service engineers still holds true, just as anyone here agrees that the first order of business in any electronics repair is to make sure all essential power supplies are working properly.
In order to verify and troubleshoot the HK870 amplifier section, one needs to take some simple step. Here it is!
If you have any suggestion, I would like to hear it.