Technics SA-TC30 amplifier

J

Jiri Kuukasjärvi

Guest
Hi!

I have this AV-amplifier.. And there´s a problem.
After 30-45min on use, the outputs mute. No sound.
Works ok after turning off & on again. For a while. Then again, no
sound.
Amplifier works ok after it has heated up enough..

This seems to be temperature-related problem.. Maybe a bad soldering?
Or possibly some bad component? Any suggestions? I haven´t yet opened
the machine.

- Jiri K.
 
check for dry joints around the power output IC and on main board. Thats the
first step.
eliminate that before hunting for faulty components.

Alex.

"Jiri Kuukasjärvi" <jiri.kuukasjarvi@pp.inet.fi> wrote in message
news:3F1BEE5B.1A7BE13D@XXpp.inet.fi...
Hi!

I have this AV-amplifier.. And there´s a problem.
After 30-45min on use, the outputs mute. No sound.
Works ok after turning off & on again. For a while. Then again, no
sound.
Amplifier works ok after it has heated up enough..

This seems to be temperature-related problem.. Maybe a bad soldering?
Or possibly some bad component? Any suggestions? I haven´t yet opened
the machine.

- Jiri K.
Click to expand...
 
I disassembled the unit, and checked solderings..
There were some cracks on solderings of those power
IC´s (or whatever, sorry for my english.) Anyways, I resoldered them.
I´m now testing it.. We´ll see if the problem is solved.

- Jiri K.

Alex wrote:

check for dry joints around the power output IC and on main board. Thats the
first step.
eliminate that before hunting for faulty components.

Alex.

"Jiri Kuukasjärvi" <jiri.kuukasjarvi@pp.inet.fi> wrote in message
news:3F1BEE5B.1A7BE13D@XXpp.inet.fi...
Hi!

I have this AV-amplifier.. And there´s a problem.
After 30-45min on use, the outputs mute. No sound.
Works ok after turning off & on again. For a while. Then again, no
sound.
Amplifier works ok after it has heated up enough..

This seems to be temperature-related problem.. Maybe a bad soldering?
Or possibly some bad component? Any suggestions? I haven´t yet opened
the machine.

- Jiri K.
Click to expand...
 
Yes, you told it to me. I sent this question to the group before mailing to you.

And of course I forgot to cancel..

Amp is fine.

- Jiri K.

Alex wrote:

comes on when the volume goes up.
though i think i told this to u in onf of our personal emails :]

hows the amp going?

"Jiri Kuukasjärvi" <jiri.kuukasjarvi@XXpp.inet.fi> wrote in message
news:3F1C48F9.F74E5415@XXpp.inet.fi...
One more thing.. Is that fan on the back supposed to spin all the time,
or is there some kind of thermal switch controlling it? I kept the unit on
for
over 1h,
and it got almost too hot to touch.. But fan didn´t spin at all.

- Jiri K.

Alex wrote:

check for dry joints around the power output IC and on main board. Thats
the
first step.
eliminate that before hunting for faulty components.

Alex.

"Jiri Kuukasjärvi" <jiri.kuukasjarvi@pp.inet.fi> wrote in message
news:3F1BEE5B.1A7BE13D@XXpp.inet.fi...
Hi!

I have this AV-amplifier.. And there´s a problem.
After 30-45min on use, the outputs mute. No sound.
Works ok after turning off & on again. For a while. Then again, no
sound.
Amplifier works ok after it has heated up enough..

This seems to be temperature-related problem.. Maybe a bad soldering?
Or possibly some bad component? Any suggestions? I haven´t yet opened
the machine.

- Jiri K.
Click to expand...
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top