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Sansui A-909 LED indicator(peak power meter)

Hi, I have a Sansui A-909 amplifier, witch needed repair because it had no sound. But in the repair process the technician somehow burn a part, IC - LC 7815 H analog switch and then the lights for selecting Phono, turner and tape1 went dead, but the tape 2 option work, but the peak power meter (LED input signal indicator) went dead as well. After I managed to find a replacement IC, the red light for the input function come back on and everything seems to work ok, but the peak power meter for both channels is still dead, only the two pilot lights on the bottom of the LED indicators lights up, but nothing moves like before when the sound came through

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  • Audio Player... Master
  • 30,783 Answers

Check you have 14 volts on pin 3 of the driver chip for the meter.

Posted on Apr 05, 2017

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

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Posted on Jan 02, 2017

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Anonymous

  • 236 Answers

SOURCE: loss of one channel to speaker

when you say switching input wires you mean your source? that you switch it? you only have switch problem, it is mechanical type swutch need to clean only, if still possible. i dont know if you can find replacement.

Posted on Mar 25, 2008

Anonymous

  • 185 Answers

SOURCE: QSC 2450 Power amplifier

i have a pyle pro 1000 watt max 2 channel mono and 2 channel stereo and when i get that thing loud the little red light cums on basically what i mean is that the amp on channel one is cooked i myself i wouldn't even use it y cause more damage

Posted on Apr 07, 2008

robotek

Graeme Ross

  • 1512 Answers

SOURCE: Question on BB2125 2 Channel Amp

Hi jgoudie

It is a signal sensing turn on unit, so will not turn on until you have supplied signal to it. Plug it into a signal source and see what it does. But unfortunately, in my experience the protection light coming on means there is a fault in the amp.

You can download the user manual for the amp from here. Click downloads in the middle of the page:)

regards
robotek

Posted on Aug 19, 2008

HalfmoonUSA

  • 145 Answers

SOURCE: AC & Rear wiper switch button indicator lights blink

The procedure for re-setting the HVAC control panel on a 1998 Dodge Grand Caravan follows:
With ignition on but not running
1. turn knob to air vents
2. turn fan knob to ON
3. temperature setting on COLD (2X) {I have dual temp controls}
4. hold top(rear wiper) and bottom (rear wiper with wash) buttons pressing down together until all the buttons cycle through (this will require 1 to 2 minutes of continuous pressing)
I learned this from a very helpful local Dodge service adviser

Posted on May 15, 2009

smarthome2

Frank Fulton

  • 1114 Answers

SOURCE: NAD 302 PHONO STAGE

Reverse your RCA input around and see if the problem follows, this will determine if the problem is in the turntable output signal or the preampsection of your amp. If it stays on the same channel, slightly move the RCA that's dropping out signal around. If the signal cuts in and out, you know it's just a weak solder joint on the input rca of the amp. If it does not change, your problem is deeper. Chances are it's a "cold solder joint" on the input section of the amp and would only be a labor type repair and no parts involved. That can be a double edged sword as well depending on how long it takes to find it. If you have to have it serviced, find a local shop that's been around a while, they are likely to be a little more insightful as to the exact problem quicker. Hope this helps

Posted on Jun 26, 2009

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Fact or fiction. Are Rockford P10002 amps overrated


The efficiency of an amplifier has nothing to do with the RMS rating of the amplifier. It is true that no amplifiers are 100% efficient. The efficiency of the amplifier is calculated by how much power output it has compared to how much power it actually uses to create that output power. The RMS rating is just a measurement of the output power with no consideration of the amount of power that is needed to create that output power. Most of the high-end amplifiers are properly rated. If you see power ratings that refer to peak power, it is a little misleading. The true power of an amplifier is the RMS rating. It stands for "root means squared" but is the effective power that you hear, often referred to as the true power. It is calculated by taking the peak power and multiplying it by .707, which is always less than the peak power. When the rating of an amplifier is calculated they use a sine wave at a single frequency and it has a positive peak and a negative peak. If the power is calculated using both peaks it is called the "peak to peak" power rating. When it is calculated using only one peak it is called the "peak" power rating.

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