Question about Pioneer Audio Players & Recorders

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I have a vintage Pioneer amp SA-7100. When I switch it on the power red light fails to come on. The 'protection' red light beside it does come on for about 3 seconds before going out. No sound comes from amp. We recently had a power cut on the national grid and I suspect the amp got damaged then. Can this be fixed? I have checked all the fuses - one on rear, and 3 inside and they all look intact. Help!

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  • Pioneer Master
  • 3,368 Answers

You probably have a blown output transistor. It can be fixed contact your service shop. It may be covered with your homeowners insurance.

Posted on Nov 27, 2014

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Posted on Jan 02, 2017

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simplemitch
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SOURCE: PIONEER DC-Z92 CASSETTE DECK AMPLIFIER

Is this one of the units that has a ribbon cable ( looks alot like an IDE hard drive cable) that connects all the components together? It also has a squre plastic fan that protrudes slightly from the rear (by about a 16th of an inch)? If so, it's the power module which consists of 2 boards (along the fan housing). You can probably find replacements for about $70, but I wouldn't bother. They quit making new replacements several years ago and any board you get now is just a pull from old stck units.... and they fail about 2 minutes after you put them in. Pioneer knows this but still sells the defective parts.

Posted on Oct 13, 2007

petraman7
  • 1175 Answers

SOURCE: Gem Sound XP-350 both channels failed

Speaker fuses are generally fast-blow styles 250 volt glass
If an amp shuts down, with speakers connected, it sounds like one of the power supply lines does NOT like what it's "seeing" . Probably output transistors bad ( or module)

Take it to a tech.

Scott out.

Posted on Jan 08, 2008

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

Grubhead
  • 5151 Answers

SOURCE: Bryston 4b amp, left channel blows the back panel

I would check out whatever drives the left channel first. If it is a transistor, you can put a ohm meter on the terminals and see if it shows a short (amp turned off). If there are two transistors for the left channel, and you find a short on one only, replace the other to be on the safe side.

Posted on Mar 25, 2009

petraman7
  • 1175 Answers

SOURCE: NAD C270 amp won't switch from red power/protection to green.

The AH may denote "slo-blo" style as opposed to Fast-acting
A fast-acting fuse will look like a single strand of wire ( maybe wiggly looking) ..A Slo-blo will have an element in it and a spring

Posted on Apr 11, 2009

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