Question about Kenwood Audio Players & Recorders

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Found an old vintage Kenwood Integrated Amp in the attic; Model KA-7100, sold from 1977-80. Unit is in great shape except it has no output signal. Took off the cover to find 7-8 old "mud-dabber" wasp homes but no other obvious damage to any components. After cleaned up and replacing all the fuses, connected inputs, plugged in unit and little red light came on but no sound. Haven't plugged it in again for fear of messing it up but can't recall hearing a "click" after a short delay after turning it on. Any general or specific procedures/advice for trying to get an old amp up and running again?

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  • Back2life Electronics Apr 26, 2017

    if you do not hear a click, it could be that one or more channels are blown thus no relay click condition. It could also be a fault in the speaker protection relay circuitry. May be time to get the unit serviced. That's a nice amp and certainly worth fixing.

    www.back2lifeelectronics.com

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  • Kenwood Master
  • 76,846 Answers

You are wasting your time on this.

Posted on Apr 26, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Trouble shooting a Denon Reciever

I just picked up a non working AVR 900, there are a total of 4 fuses inside the unit: 2 on the protect board, 6.3A and 8A, and 2 in the middle near the front. I was told by Denon the following might reset the microprocessor. 1) unplug unit 2) press and hold tuner and video select on front panel 3) plug in while holding buttons Unit display should flash until you let go of buttons. Unit stays on you should be ok/ goes back to red- service They also said: There are 3 types of protection that will commonly occur with our receivers. This is designed to protect the unit from permanent damage. 1) Thermal Protect = When the unit overheats this will occur, usually if there is not enough air space above and around the unit. There cannot be anything directly on top of the unit and there must be at least 4 inches of airspace above the unit. 2) Overload Protect = Most commonly occurs when a strand or more of copper speaker wire is not securely connected to the speaker terminal and is touching the chassis of the receiver. If the volume is turned higher than 85% this may also occur. If you need to turn the volume higher than this point to get the level you want, you need a more powerful amp. 3) DC Protect = When an amplifier fails this will occur. This will protect dc current from damaging the speakers. When this happens the unit will need to be serviced. I had a bad 6.3A fuse ? I replaced it and tried to reset. The microprocessor would not reset. I had the exact same results you had. The chip on the back side of the front IC board was smoking. Before I attempted the reset I asked Denon if it was worth sending in for repair. The answer was "NO" BC

Posted on Apr 24, 2007

robotek
  • 1512 Answers

SOURCE: Kenwood basic M2 Amp Lightning strike

you can check the output transistors for short circuits with the low ohms range or diode checker . If they have failed, then it is often a good idea to replace all as much stress can be placed on an output array in this type of failure. to repair reliable, all outputs on an offending channel should be replaced.

Make sure the fuse you replaced was the same type of fuse. check markings.... T stands for sloblo... a fast blo duse may let go at turn on. The power supply may have a shorted rectifier diode in it also.

be aware however, every time a fuse of that rating blows... more damage may be occurring to the amp.

Posted on Dec 15, 2007

robotek
  • 1512 Answers

SOURCE: Kenwood KR-4010 (late 70's vintage) with signal to IF amp but no output

Don't bypass the relay contacts. They serve to disconnect the amp stages from the speaker if a DC condition is present, and in doing that, save your speakers form damage. Check for a DC offset condition on the junction of the emmitter stabilizer resistors to the STK0040 on each channel. They will be 0.47 ohm power resistors(2 per STK) connected to pins 3 and 8 of the STK. Anything substantially greater that 100mv here generally indicates a blown STK. Don't bother to change both, but just the one that is faulty. Another common problem for this age of amp. The high silver content in the legs of the transistors allows for "growth" between legs and internal connections of the transistor. Check for "black death" on the legs of transistors driving the STK. . . I tend to replace them if in doubt. If you need expert advice, comment me back. I am an audio specialist.

Posted on Feb 03, 2008

  • 4234 Answers

SOURCE: I have a kenwood KA

Most likely the output transistors are shorted. This causes the output stage to draw too much current and blows the fuses. Expect a parts cost around $20-$40. Add in the local labor rate for the total repair cost.
Dan

Posted on Apr 17, 2008

SOURCE: I have a kenwood KA-94

Unit may have any one of several problems: defective or shorted speaker(s), -- ICs work within certain circuit paremeters; B+&B- voltages from power supply also provide voltage to secondary drivers and biasing circuits. Any shorts and/or transistor leakage may cause failure under load. The entire circuit should have been tested before use

Posted on Aug 19, 2008

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Hi spanky

Where to start :) I am excited thinking about them :p You got 2 totally cool pieces of classic vintage gear there in the C2 and the Marantz. I have a C2 preamp myself (gathering dust but wont sell it cos its excellent) and the marantz would be totally cool to have(but then I am a little biased towards 70's vintage marantz). They ruled the roost in HiFi amps throughout that decade.

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The marantz is a little lower in power at 75rms a channel, but will have the sonic edge in vintage sound over the kr1100. Look them up on ebay and you will find that they do have some value to collectors and people seeking nice tone. There is an 1152 for sale here for AU$900

Best bet is to fire up the 2 integrated amps,and see how they are going. Run them for several hours to be sure there is no strange noises and crackles. Then decide if you want power or finesse.

You could also run both amps from the C2 preamp by connecting to the Amp in connections to the rear of the integrated amps.

happy to talk to you more about it, hit me with a Fixya if my advice was helpful to you. I would keep the marantz, use that and sell the rest and buy some nice speakers:)

regards
robotek

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