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Servo 200 speaker protect relay operates intermittently. Acts like connection problem.

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  • Bob T Dec 10, 2012

    I should add that no input or output cables are connected and no protection lights come on. The relay can be heard clicking unevenly, sporadrically. Is this a common problem? PS--I now have a schematic .

  • Bob T Dec 18, 2012

    As it turns out, the relay was the problem. To provide some indication of the stae of the circuit operating the relay, I attached an LED across the coil with a 3.3k and diode in series. I had to use this high value to protect the LED from the 42 volt supply and any more current through whatever turns on the relay caused the coil voltage to drop to 6 volts. I finally sprayed some circuit cooler on the relay and after a less than a minute, the relay dropped out. The voltage across the coil (LED and resistor) went to 32 volts and the LED glowed brighter. I rigged this up so I could "see" the conditions if the failure didn't last long. Got tired of waiting, so that is what caused me to spray the circuit cooler. After theis failure, the relay didn't come back. Removed it and the coil was open. By some miracle, Radio Shack has a drop in replacement. Contact ratings may not be high enough for some extremes of use, but I don't use the amp that way. Besides, this is a relatively modest output power amp. And also, my commecnt about having a schematic need correction. The relay driving circuit is not he same on the Servo 170 and Servo 200. My schematic is for a Servo 170. Anyway, it's now fixed. Hardest part was getting it to fail or finding the conditions under which it would fail. I have several DVM's and scope and circuit tracers but sometimes just rigging up an LED can show useful info easier that fussing with an expensive piece of test equipment. Usually a relay develops contact problems not a intermittent coil. But it is mechanical so any thing can happen. Thanks for the thoughts and concern. Bob Thomason

  • Bob T Dec 31, 2012

    My Samson 200 did this since new. Finally got it to fail when cold. The speaker protect relay coil would go open, dropping out the contacts to ground, shorting the speakers. Radio Shack has a relay that will get it going but installing it should be done by a tech with experience in removing parts from Copper clad boards. The ground connections take a lot of heat to free up the relay for removal.
    Bob Thomason

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  • Samson Master
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You could start with replacing the relay. They can play up!

Posted on Dec 17, 2012

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1 Answer

I just need schematic for Servo 200


Hi...try this...http://sportsbil.com/other/SAMSON%20SERVO%20170%20260%20550%20SCH.pdf thanks...hope it helps,

Jul 26, 2017 | Audio Players & Recorders

1 Answer

I had phrased the previous question with typo errors


When any electrical item doesn't work after being moved, suspect some kind of physical cause. Such as a bad soldering joint or other damage inside caused by an unknown bang or jolt during the move. Perhaps even an alien object inside like a metal pin etc.

Mar 25, 2015 | Samson Audio Players & Recorders

1 Answer

I have a sherwood RDV6095RDS and when you switch is on and select either video or audio the display comes on and then after about 2-3 seconds the unit goes back in standby mode. I can hear the relay...


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on; or it may turn on but produce no audio to the speakers.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

Sep 19, 2011 | Sherwood RD-7500 Receiver

1 Answer

Working normally when all of the sudden relays start clicking and i loose sound .i have to reset to factory specs and recalibrate,it's starting to happen very often. any ideas


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on; or it may turn on but produce no audio to the speakers.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

Sep 10, 2011 | Denon AVR-1708 Receiver

1 Answer

My fisher ba-6000 amp powers up, but no clickie of the safety relay, hence no rocking sound!!!! The problem is intermittent though as of writing this me amp no work...


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

Jun 01, 2011 | Audio Players & Recorders

1 Answer

I have a Audio/Video Receiver 6108 model. Whenever I turn it on for a few second it shut it off itself. Look like it has a relay to shut that off. I have check all 10 of SAP16 amplifiers and they look...


They 'look' okay?

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

May 29, 2011 | Sherwood RD-6108 Receiver

1 Answer

Protect is displayed on the unit. I know it is a speaker wire. Do I unplug all speaker wires and then plug in one at a time and turn unit on and repeat till I find the bad wire??? Please advise. System is ...


Why are you asking instead of doing?

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

May 28, 2011 | Sharp CD-BA200 CD Shelf System

1 Answer

Every time I use Samson xpl amplifier It shuts off after playing for about 10 minutes do you think what's the problem?


Heat.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.


Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

Mar 06, 2011 | Samson Servo 300 Amplifier

1 Answer

No sound coming with protection light on


It's either overheated or you may have faulty speaker wiring or a shorted speaker. These directions come from a Samson servo 120a but the theory is the same.

The following conditions will cause the Protection LED to go on:

Initial power-up: For approximately five seconds after initial power-up, the relay

speaker connection circuitry is deactivated and the speaker output is muted. If everything is operating normally, you will hear an audible click at the conclusion of this brief period, as the circuitry is activated and the Servo 120a begins delivering signal to connected speakers (at which point the Speaker LED will light if the Speaker on/off switch is in its "in" position). It is normal for the Protection LED to fade gradually after the amplifier is powered off.

Overheating: A temperature sensing device in the Servo 120a will cause the relay speaker connection circuitry to be activated (and the Protection LED to go on) whenever the operating temperature of the unit rises above a safe level. To guard against this problem, make sure the Servo 120a receives adequate ventilation on all sides ; in extreme environmental conditions, you may also

want to consider the use of cooling fans.

Severe overcurrent conditions: This occurs whenever the signal being output

from the Servo 120a rises to a level above 20% THD (Total Harmonic Distortion).

Shorted speaker cables: This will occur if, due to faulty wiring, the hot and ground signals being output by the Servo 120a short to one another.

Output impedance drops below 2 ohms: This can occur if the Servo 120a is connected to inappropriate speaker systems (see the "Setting Up and Using the Servo 120a" section in this manual for more information).

DC voltage detected at speaker output: The most likely cause of this is an internal failure. In general, any time the Protection LED lights up (other than during the approximately five seconds following initial power-up), there is reason to be concerned. If this occurs, turn the Servo 120a off immediately and carefully check all wiring and external devices in order to locate and correct the condition that caused the LED to light up in the first place.

Dec 27, 2010 | Samson Servo 170 Amplifier

3 Answers

GOES INTO PROTECT MODE


Before you throw it in the garbage check all the speaker wires, if you have one strand of wire touching the case of the receiver that acts as a short to ground and will make it trip into protect intermittently.

First things first unplug all speaker wires and see if it turns off, if not reconnect them one by one until the unit goes off.

Hope this helps,

Thanks!

Jan 04, 2010 | Sony STR-DE597 Receiver

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