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Technics SUV4X new class A Amp - 20 odd years old but lovely sound !!

Amp gone into "safety operation" mode - flashing amber light+no output.
Amp is connected to 1pr. 8ohm KEFS + 1pr. 8ohm CELESTIONS(correct impedance selected on amp). I had it on 3 of 10 ( loud amp - 65wpc ) and the output suddenly stopped and amp went to above mode. i switched it off and noticed the transformer was hot - although well ventilated. ive taken cover off and checked the 2 fuses i could see ( both ok ) + can see no toasted components.Do you think ive cooked the transformer or possibly the output IC?. As the unit will power up i dont think the Transf. is the problem - hopefully it could be other components that are standard service items - cheaper ones??!. Thank you if you can help me. A fellow Biker !!!!!!.

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  • Anonymous Aug 26, 2008

    Me too. Exactly the same. I was given the amp after my old one died (also a vintage hand-me-down!).



    The amp worked perfectly for about 9 months and then all of a sudden the 'Safety operation' light came on and now it just blinks repeatedly and no sound can be heard.

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Hi guys

Quick check... If the amp still stays in safety mode with the vol turned down and the speakers disconnected, it will have failed in some way. Since you have the safety operation light ON, you can expect that the power transformer is OK. I would expect that you have a DC offset condition on one channel. The most common problems you may have are

  1. dry solder joints about the power stages such as regulators, and output/driver transistors/IC's.
  2. blown output transistors/output IC with possible fusible resistor failures, and or sometimes burnt up printed circuit tracks.
  3. a voltage rail failure from a burnt fusible or power supply component.
If you are up with electronic fault finding, soldering and have the tools, have a go yourself, I could talk you through it. If not, I would suggest you contact you local HiFi specialist and find who can repair it or at least check to see what has failed for you. Good Luck. If you cannot find someone, hit me back and I will try to find someone for you. Cheers

regards
robotek

Posted on Sep 06, 2008

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Posted on Jul 28, 2009

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What if went in safety mode, safety mode is froze in screen. Won't do anything


"Safety" mode - literally? I don't see that anywhere in the manual.

Page 13

Speaker Connection Precautions

(North American and Taiwan models) You can connect speakers with an impedance of between 6 and 16 ohms. If you use speakers with a lower impedance, and use the amplifier at high volume levels for a long period of time, the built-in amp protection circuit may be activated.

Page 66

The STANDBY indicator flashes red


The protection circuit has been activated. Remove the power cord from the wall outlet immediately.

Disconnect all speaker cables and input sources, and leave the AV receiver with its power cord disconnected for 1 hour. After that, reconnect the power cord and set the volume to maximum. If the AV receiver stays on, set the volume to minimum, disconnect the power cord, and reconnect your speakers and input sources. If the AV receiver turns off when you set the volume to maximum, disconnect the power cord, and contact your Onkyo dealer.

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.

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I am not familiar with "I7 15" but will assume it is a speaker. Please correct me if I am wrong. As for the amp setup:
The amp output impedance is not adjustable. The amp is rated at 1 ohm which means you can connect any amount of speakers onto the output as long as the sum total of the load you connect to the amp is not less than 1 ohm.
Speaker impedance is also not adjustable but the total load connected to an amp can be altered by altering the way the speakers are connected to the amp.
The formula for calculating impedance looks very complicated but is quite simple.
First you have to understand the difference between series and parallel connections.
See diagram.
Series: Connecting 2 or more speakers by using the negative on one speaker connected to the positive on the next speaker.
Parallel ( // ) : Connecting the positive of a speaker to the positive of the next and the negative of the speaker to the negative of the next.
suzman_9.jpg
Connecting speakers in series is handy when you have two 500 watt speakers for instance and want to run them off an 1000 watt amp. Connecting them in series will assure that you dont over power the speaker and damage it. When connecting speakers in series the total of the impedance of the speakers is the impedance of each individual speaker added together. In our example the total impedance will be 2+2+4=8ohm
The parallel connection impedance calculation is a bit more complex.
1/Rtotal = 1/R1 + 1/R2 + 1/R2
1/Rtotal = 1/2 + 1/2 + 1/4
Rtotal = 0.8 ohm

If you have Microsoft Excel installed in your computer you can enter the following formulae as shown into the spreadsheet. After entering the formulae you must enter the values of the speakers into fields A2, B2 and C2 and it will calculate the total impedance for you.
Using less speakers just remove C2 from the formula.
Using more speakers add for instance D2 into the formulasuzman_8.jpg
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If you use one speaker only then there is no adjustment to be made.
Your particular amp can also connect to an additional amp( and speaker) by using the "PASS-THRU" connectors. This saves you from using an additional set of signal wires from the head unit.
I hope that you now have a better understanding of amp wiring.
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There are several possible reasons.
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Status Indicator Lights / Protection Circuitry
There are three status indicator lights on the top of the amplifier. These are as follows:1) "Power" (Green): lights to indicate that the amplifier is turned on and operating normally.
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Yes you can,,,,,BUT the output labelling on the AMP will tell you where you can connect the 4ohms or the 8ohms....please read these labels and connect the 4ohm speakers to the 4ohm terminals, and the 8ohms to the 8ohms terminals...

If you intend to connect the 4ohm and the 8ohm speakers in parallel then the output impedance terminals you use should be the 4ohm ones.

If there is no labelling showing any 4ohm output terminals then its best if you dont use the 4ohm speakers at all....just connect the 8ohm to the 8ohm terminals...you dont mention any crossover networks inside the speaker boxes or if you have tweeter speakers... so just stick to the basics above at present....

Cheers From YUBEUT

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