Hello.
This is my first post ever, although I am always checking out other threats. Living in Japan I am a fan of old Sansui gear, proud owner of an AU-666 and a AU-7500 both of them brought to life by myself. I have some knowledge but I am not a technician.
I was able to secure an au-9900 which kind of worked... distorted sound, noise from left channel... so I decided to recap it. Took me a couple of days...powered on for the first time and the relay made the nice "click" but suddenly disaster... 2 fuses blew in the relay board (F2582).
After a quick check, realized that a piece of lead from my suction tool was in the middle of the fuse holders contacts and that shorted the board....replaced fuses, powered on and again blown fuses again....so I started to look for damaged components. Found out that D002 in F2582 was shorted and tr06 in F2568 was shorted as well. After replacing those It power on fine but stays in protection mode.
I checked the transistors in f-2583 and also checked the output transistors but they all seemed alright (tested with diode method).
I was wondering if anybody has any experience with this amp. Any pointers would be of great help.
Thank you.
This is my first post ever, although I am always checking out other threats. Living in Japan I am a fan of old Sansui gear, proud owner of an AU-666 and a AU-7500 both of them brought to life by myself. I have some knowledge but I am not a technician.
I was able to secure an au-9900 which kind of worked... distorted sound, noise from left channel... so I decided to recap it. Took me a couple of days...powered on for the first time and the relay made the nice "click" but suddenly disaster... 2 fuses blew in the relay board (F2582).
After a quick check, realized that a piece of lead from my suction tool was in the middle of the fuse holders contacts and that shorted the board....replaced fuses, powered on and again blown fuses again....so I started to look for damaged components. Found out that D002 in F2582 was shorted and tr06 in F2568 was shorted as well. After replacing those It power on fine but stays in protection mode.
I checked the transistors in f-2583 and also checked the output transistors but they all seemed alright (tested with diode method).
I was wondering if anybody has any experience with this amp. Any pointers would be of great help.
Thank you.