Kenwood KA 9100
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benricci
Super Member
You haven't given us much information to go on. What have you troubleshooted so far?
Some questions that would be helpful for you to answer:
Some questions that would be helpful for you to answer:
- Is this a brand-new problem?
- Did you change anything in your setup before this happened?
- Have you checked with both speakers AND headphones to eliminate one of those as the issues?
- Are all your cables snug and secure?
- Are the VU meters moving when you feed audio into the receiver?
- Have you tried all the inputs to determine whether it is just one source that's not providing output (tape, phono, radio, aux), or all sources?
- You sure you have the correct speakers selected on the front panel?
- Have you accidentally engaged the tape monitor?
- Have you cleaned all the pots and switches with DeOxit to see if that helps?
- You asked if a fuse had blown. We would have no way of knowing based upon your vague description. Did you try replacing it and see if that solves the issue?
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Blue Shadow
Waiting for Vintage Gear from this century
There are internal fuses but that means the reason the fuse blew needs to be determined prior to just switching it back on again with new fuses in place. It could be done with a dim bulb tester in the AC line feeding the amp to prevent further damage if the reason for a blown fuse is unknown.
Dswankey
Lunatic Member
If I'm not mistaken this unit does not utilize jumpers, it has a switch instead similar to a Sansui AU-717 I had.
Make sure the switch is in the proper position (see page 9) also what @benricci mentioned about Tape (monitor) switch
http://akdatabase.com/AKview/albums/userpics/10007/Kenwood KA-9100 Instruction Manual.pdf
benricci
Super Member
The Kenwood he has doesn’t need jumpers if it’s operating in the normal setting.
I think it was working when I stopped using. That was around 2005. I put the tv audio out on all of the inputs. I checked the tv out and audio to my head set. I have not opened it up. I bought the amp new in 1978. I could have had electric overload fron a lightning strike close to the house. I was not using but it remained plug in.
benricci
Super Member
OK, so you bought it 45 years ago, and it's been sitting for nearly 20 years unused, is that correct?
After this many decades without regular use, service or cleaning, you could have a number of issues: leaky capacitors, bad solder joints, blown fuses, oxidized pots, etc.
I mean, without seeing the physical unit first-hand, it would be hard to diagnose.
Really, what it likely needs is a good service and thorough cleaning from a qualified repair technician to get it back in working order.
After this many decades without regular use, service or cleaning, you could have a number of issues: leaky capacitors, bad solder joints, blown fuses, oxidized pots, etc.
I mean, without seeing the physical unit first-hand, it would be hard to diagnose.
Really, what it likely needs is a good service and thorough cleaning from a qualified repair technician to get it back in working order.
Do you hear a “click” after about 3-5 seconds after you turn it on? Hopefully it’s not an output module issue, “click” is good.
If you hear a click then it might just be something very simple like a tape monitor / processor loop switch turned on or something. You might want to double check all of the basic stuff like input / output connections, pre/main separator switch, cables and function switches first before you take it in for service. Click generally means she’s ready to go and waiting for an input signal. Do lower the volume before clicking switches though, especially with headphones on. Lower volume, flip switch or move cable then slowly raise volume so you don’t blast your ears. Try it with speakers too, you might have a dirty headphone jack or similar.
Blue Shadow
Waiting for Vintage Gear from this century
Oxidized controls can cause all types of problems. Be warned...this amp is a beast to work on and to really deoxit the controls on this amp requires a lot of disassembly. If you haven't already, work all the switches and pots while listening. if you get some sound it might just need a good cleaning. I had a really nice one that Echowars held my hand on while restoring it. They are really sweet sounding and a bit of eye-candy, too. Good luck.
