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Why does stereo amp cut out at higher volume

I recently bought a Technics mini hifi system (SC-CH900) with a SU-CH900 amp and SB-ch900 speakers. The power cuts out when playing music at higher volumes. The higher the volume, the sooner it cuts out. There is an "E" displayed on the main amp display after the power cuts out. The power does not cut out when I disconnect the speakers ( I've checked the polarity of the speaker wires) or when I use headphones. In a TechInfo sheet that I found for the amp there are some instructions for remedying the problem, so I assume it is common. 1. Defective fan motor - replace the fan motor. 2. A faulty detector circuit - Mount a capacitor across both ends of the fan motor. 3. Smoothing capacitor (C571) used in fault detector circuit of output IC is possibly dry joint - resolder the capacitor. The fan works - it goes on and off depending on the volume. I assume this is normal behaviour. The fan doesn't seem to be on too long when the power cuts out. I can't really tell if there is a dry joint in the C571 capacitor without dismantling more.

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  • Audio Player... Master
  • 5,113 Answers

You seem to have the answers to your question. I would just resolder the connections anyway without checking. If it solves the problem you have saved yourself a lot of money. If it doesn't follow the other steps in order of cheapness!

Posted on May 20, 2013

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6 Suggested Answers

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Posted on Jan 02, 2017

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johex
  • 75 Answers

SOURCE: my sc-ch900 cuts out after a minutes playing. Is

did u play it real loud? if not, probably not. in most over load problems the system shuts down pretty fast. it will not take minutes if it has an over load protection. it is pretty hard to tell exactly what is wrong with that kind of sophisticated systems unless we take a look inside. it is probably bad power supply within the system. like i always suggest, if warranty covers-replace it. otherwise u have to get it fixed.

Posted on Mar 12, 2010

megatronix
  • 57 Answers

SOURCE: Technics SU-V2 keeps cutting out

An amp will cut out if the output protection circuit kicks in. This circuit compares output power against the preset level. Each channel has it's own, independent protector. There are calculations that can be done, but for a novice the rule of thumb is to "never use a speaker with a power rating less than the amp AND a lower impedance than stated". Typically using a 4 ohm load on a 8 ohm system is inviting disaster. Even if the system does not become a smoke generator, you might notice that though "louder", the sound quality is deteriorated. Many "audiophiles" often hook up some combinations of speakers to have "surround" without really understanding that the collective impedance actually changes (generally lowers).

Posted on Jan 21, 2008

SOURCE: amp cuts out

The fan is ageing and putting noise on the protect line. Replace it or put a 100 uf cap across the fan at the plug. Beware polarity is marked wrong on p.c.b.

Posted on Feb 23, 2008

marsrover
  • 682 Answers

SOURCE: sound cuts when volume is turned up

check that power amplifier rating(how many watt)must be more than total speaker rating by 20% at least..
exampel:if speakers watts are 100 watt-amplifier watt must be 120 watt.

Posted on Mar 15, 2008

marsrover
  • 682 Answers

SOURCE: AMPLIFIER SU-CH900 CUT OFF

it goes to protection mode because it draws too much current from high bass.

Posted on Jul 28, 2008

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http://www.electronicspoint.com/technics-su-ch900-switching-off-t53309.html

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hello it sound like the output ic may be in trouble you may have just dry joint on the ic which just resolder it . or there could be a capacitor leaking or they may have swelled up in which you will have to replace. it's best to do some visual checks first i'e look for any burnt parts any capacitor with bulging tops

regards
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My sc-ch900 cuts out after a minutes playing. Is


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AMPLIFIER SU-CH900 CUT OFF


it goes to protection mode because it draws too much current from high bass.

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