Question about Audio Players & Recorders
I have a KAC-8102D amplifier. I set off the protection Function on it and now i can not get it to work, the fuses are all fine, and i tried disconnecting and reconnecting everything with no luck. Is there somthing i need to do inside the amplifier. They need to make a little reset button that you press when the function kicks in :S. any help or suggestions?
It sounds like you have eliminated all the things that could generate this symptom that are external to the amp. It is most likely that there is an internal problem that is causing the amp to go to protection mode. A power supply failure(maybe a fuse) is the only really user serviceable part inside the amp. Perhaps check for failed fuses, replacing any that may have blown with exactly the same type. BE SURE TO UNPLUG AT THE WALL FIRST:)
Is the amp still under warranty? If so, then returning it to a Kenwood service center is the shot. If you want to have a go at repairing it, I can talk you through it, but some experience with this sort of thing is very necessary. Good luck
Posted on Apr 06, 2008
Oh dear, your budding lil electrician may have gotten out of his depth:).
Shorted speaker wires often result in damage to the amps output stages. The blinking light tells us that the unit has gone into protection mode, preventing damage to the speakers from the amp. It will have what is termed a DC offset condition being generated by the channel; that got shorted. There is no easy fix for this and you have checked the obvious with fuses and removing all speaker wires and checking operation. The unit will have a blown output transistor/array, possibly driver transistors, and fusible resistors, and diodes to that channel. The bias current will also need to be set up again once repairs are completed.
There are no user serviceable parts in a unit like this. With good knowledge of electronics, a multi meter, soldering iron and experience at using all, you could fault find the channel, replace the parts yourself. I should warn you that if descrete components are used, they can be difficult to repair because of the nature of DC coupled linear stages employed. The best option is to take it to a repair man for a quote.
I am happy to try and talk someone through a repair process, but there is a degree of difficulty ascociated with not being able actually work on the amp.
The best solution for you is to get a tech to look at it. This sort of repair work can range from $80-150 depending on the parts used and the time taken to fault find and replace parts. I hope that this helps you. Your appreciation for my time spent to give you this advice is best rewarded with a FixYa.
Posted on Sep 10, 2008
SOURCE: What is the watts of
It's a 2 channel 75 X 75RMS made in 1988. I repaired the circuit board but I cannot find a a power cable (kenwood part# E-30-2302-05). If anyone has a schematic or a din pin out for that I would love to see it or here from you.
Posted on Sep 22, 2008
SOURCE: My Revox B225 CD player
Hi the problem is the capacitors in the power supply area it is hard to pin point whiich one it is if you are good with asoldering iron change the lot if the deck has a standby mode and left on in the standby mode this could be the cause if not just age and usage how old is the deck. regards kirk
Posted on Dec 10, 2008
Disconnect the outside speakers "at the speakers" then turn back on. If the problem persists, disconnect the speakers at the back of the receiver and try again. If the problem stops "at the receiver" check your terminals and make sure no braids are touching each other. If the problem stops when you disconnect at the speaker, chances are good it's a bad voice coil from moisture. Most "outdoor" speakers with a brand name on them have a pretty good warranty. Good speakers have a 10 year warranty and the manufacturer will replace. If you still have an issue, post a comment and I can help you some more
Posted on Jul 27, 2009
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It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.
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