Question about Yamaha XS-350 2-Channel Amplifier

1 Answer

I have a yamaha amplifier in here for repairs, the model no is A500, i cannot get the speaker protect relay to come on, i have replaced all the transistors & capacitors in the speaker protet circuit to no avail, i,ve checked the outputs from the amp & all is ok, i,ve even replaced the relay, can u help

Posted by on

  • peter857 Apr 14, 2009

    Hi Chaps, just came across this site and yes, I have a Yamaha A-500 (great Amp) with the same problem. Except the relay clicks in then clicks out after a few seconds. Just got a cct download and about to do some surgery after testing the DC offset at the output. Seems the speaker protection cct looks at the LH channel only? Any ideas what's wrong Dan?

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 4,234 Answers

Measure DC to ground on the output transistors to check for any offset. The protect circuit is the least likely to be the problem. Post the readings here and I'll guide you from there.

Dan

Posted on Mar 11, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Yamaha RX V-795


Start with the process of elimination...disconnect speaker wires and (obviously) speakers. Does the amp still enter the protection mode? If not then check wires and speakers for issues. If the results are unchanged, look for protection circuit problems or "overlooked" power supply issues. Good luck...

Jun 01, 2014 | Yamaha Amplifiers & Preamps

1 Answer

Auto off within two seconds Yamaha RX V795


Are speakers connected when you try powering up?

If so , you have an output imbalance where there is too much DC voltage on one of the outputs and the Protect is working OK....In my opinion , not worth getting repaired ( UNless you're a tech and can do it yourself)

May 26, 2014 | Yamaha Amplifiers & Preamps

1 Answer

Fails to switch on but a clicking noise is heard when power button is pressed.


Sounds like the protection relay for the speakers constantly activating,indicating either a short circuit or high bias current on the amp power supply. A qualified tech would be able to say easily with the right gear

Jan 02, 2011 | Yamaha DSP-AX1 10-Channel Amplifier

1 Answer

My yamaha P7000 always lights its protection lamp whenever turn on...


The amp will require service. One or more power transistors have failed and the protect circuit keeps the power supply from blowing your speakers

Oct 12, 2010 | Yamaha P-7000 2-Channel Amplifier

1 Answer

DC Offsets on output - protection don't allowd to switch on


you don't want to do this( bypass the protection0
that d.c. output will burn the coils in your speakers with out making a sound!! you have a biasing problem
or like you said a d.c. offset problem it is best to work on this problem with out a load on the amp, this will allow you to trace back where the trouble is starting at. caps will cause this sort of problem but leaky transistors can also do this, even diodes.
this will require an experienced trouble-shooter.

Apr 26, 2010 | Amplifiers & Preamps

2 Answers

How do you switch from 8 ohms to 4 ohms on a 3500 yamaha amp


Switch what? It accepts 4 ohm speakers for stereo mode just fine.

Jan 25, 2010 | Yamaha P-3500 Amplifier

1 Answer

Yamaha AX-930 Audio Amplifier


HI...

Do a websearch for a competent repair shop in your region or ask the stereo folks where you got the amp.
It WILL need surgery.

Cheers,

Scott

Jan 01, 2009 | Amplifiers & Preamps

1 Answer

Auto Shut Off After 3 Seconds...?


either your DSP output stage already damaged or maybe your speakers. have it both chekced for short. or worst both of them. DSP A1000 can drive as low a 4ohms on main channels but how is the power handling of your speakers? are you sure it has not exceeded the capacity of the speakers? or maybe you have over driven the speakers and they are still ok but your amp gut busted due to over drive. If the DSP amp is busted then it is due for replacement of power transistors and drivers. you can not disable the protection circuit. at least the design. it can be disabled by a tech person with a lot of modifications but i wont go for that or it can cause more damage to your equipments. i am from yamaha before and i have made conversions of protection circuits but it is too risky.

Jun 13, 2008 | Yamaha DSP-A1000 5-Channel Amplifier

2 Answers

B speaker doesnot get on.


apply a good contact cleaner in this button and press it many times.confirm good connection between amplifier output and speaker b.connect speaker A insted of speaker B if it is working the problem will be in cabel and speaker B if not the problem in your amp output stage.

Mar 08, 2008 | Yamaha DSP-AX1 10-Channel Amplifier

2 Answers

Protection of yamaha pc 2002


Protect delay is in the relay and not adjustable as to delay time.
I would not worry unless no sound then may have to replace relay.

GOOD LUCK
BIG RED

Feb 20, 2008 | Yamaha P2500S Amplifier

Not finding what you are looking for?
Yamaha XS-350 2-Channel Amplifier Logo

Related Topics:

411 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Amplifiers & Preamps Experts

 Grubhead
Grubhead

Level 3 Expert

4576 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

The Knight
The Knight

Level 3 Expert

68209 Answers

Are you a Yamaha Amplifier and Preamp Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...