Hello,
I am new to this forum, I am living in Holland and I own a Yamaha MX-1000 for about 20 year. I like it very much although it is a bit to heavy proportioned for use in the livingroom. The sound is realy great!
Last weekend suddenly it stopped working: I switched off a light and a loud bang came out of the speakers. It went into protection and I did smell a odor of burning electronics.:worried:
I found some information on the internet like a service manual, schematic and this great forum. So I thought let's give it a try, I have a soldering iron, multimeter and an education in electronics.
I measured the tensions on both amplifiers and found out that the right schannel is broken. The multimeter on IN and OUT meassured -86 Volt.
So I removed the right amplifier from the powersupply and the protection led went normaly out after two seconds.
I saw that all of the transistors Q318 / Q328 (even numbers) in the I-Amp block are damaged (shorted) and most of the resistors R272 / R382 (even numbers) on the collectors are burned (open).
I have some questions, I hope someone can answer:
What is the best way to repair this amp? Do I have to replace the broken parts and connect the amp to power supply and see what will happen or shoud I first remove more transistors and other parts to measure them? What is the best order to fix this amp?
What more is probably broken as a result of the shorted I-Amp?
Where do you recommend to buy replacements?
I read some thing about Sony bond glue, is there a need to remove it?
I hope that you can help me.
Thanks in advance!
I am new to this forum, I am living in Holland and I own a Yamaha MX-1000 for about 20 year. I like it very much although it is a bit to heavy proportioned for use in the livingroom. The sound is realy great!
Last weekend suddenly it stopped working: I switched off a light and a loud bang came out of the speakers. It went into protection and I did smell a odor of burning electronics.:worried:
I found some information on the internet like a service manual, schematic and this great forum. So I thought let's give it a try, I have a soldering iron, multimeter and an education in electronics.
I measured the tensions on both amplifiers and found out that the right schannel is broken. The multimeter on IN and OUT meassured -86 Volt.
So I removed the right amplifier from the powersupply and the protection led went normaly out after two seconds.
I saw that all of the transistors Q318 / Q328 (even numbers) in the I-Amp block are damaged (shorted) and most of the resistors R272 / R382 (even numbers) on the collectors are burned (open).
I have some questions, I hope someone can answer:
What is the best way to repair this amp? Do I have to replace the broken parts and connect the amp to power supply and see what will happen or shoud I first remove more transistors and other parts to measure them? What is the best order to fix this amp?
What more is probably broken as a result of the shorted I-Amp?
Where do you recommend to buy replacements?
I read some thing about Sony bond glue, is there a need to remove it?
I hope that you can help me.
Thanks in advance!