Vintage HiFi Audio Forum

Repair / Help Forum => Repair / Help => Topic started by: Dart67eb on December 14, 2021, 02:35:44 PM

Title: working on a Yamaha AX-900
Post by: Dart67eb on December 14, 2021, 02:35:44 PM

I have a DMM and can use it.  I also have a capacitor checker.  Someone gave me an O scope and I bought some new leads and a signal generator.  I hope to work on it this Thursday.

Title: Re: working on a Yamaha AX-900
Post by: Dart67eb on December 14, 2021, 02:39:10 PM

I might run a new thread on it in the repair section if it works out.

Title: Re: working on a Yamaha AX-900
Post by: Vpgh on December 14, 2021, 03:27:12 PM

Done

Title: Re: working on a Yamaha AX-900
Post by: Dart67eb on December 14, 2021, 04:10:32 PM

IThe subject of this thread is that I have a Yamaha AX-900 integrated amp that I bought from the PX when I was stationed in Korea.  I was collecting dust so I gave it to my son to take to college.  Someone spilled something on it when it was running.  I saw some bad caps and some burned resistors so I replaced them.  Now I'm down to one resistor smoke checking when I power it up.  Time for actual troubleshooting.  I'll let everyone know what I find.

Title: Re: working on a Yamaha AX-900
Post by: Sir Thrift-a-Lot on December 14, 2021, 09:22:31 PM

I'm not a tech but welcome to the forum.

Title: Re: working on a Yamaha AX-900
Post by: Dart67eb on December 20, 2021, 05:04:04 PM

Here is what I saw when I opened it up.  Right off the bat I saw some capacitors and burned resistors along with residue.