Dial lights up, all control functions O.K. bou no sound.
Checked P/S output- O.K. There is power on the system, but none on
the Amp. section. No voltage on output transistors, and heatsink remains
cold. No output from any speaker, though set seems to be alive.
Is there a fuse or relay for the Amp section which may be open?
Re: Dial lights up, all control functions O.K. bou no...
Hello: Thanks for your feedback. I was surprised that the type of unit and manufacturer did not appear with the request for help, because without that information it made no sense. However I did resolve the problem by experimenting with the controls and connections on the unit. Just got it. Thanks again....
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Need to check on the power supply to the output drivers, if there is no response on the speakers it is possible that the output replay is under protection. You need to remove power plug and leave aside for an hour before the amplifier is plugged back. If all functions show on display but there is no sound check the PREAMP output- audio out. If there is audio then the fault is with a non switching of the power amp or a power amp protection. Since these are mounted boards with little access to testing you need to be skilled to go further to probe and proceed. Also Denon might refuse to service if the amp is tampered which also can be expensive.
Get this service manual and follow it - basically you will have to determine 1 - if the amplifiers get powered 2 - if the amplifiers themselves are good - touch with your finger their input and listen for the buzz on the speakers. 3 - finally if the controller is still functional - if it's not then i'm sorry but there is nothing more to be done for it: the controller is not sold as a separate part, the receiver is dead. maybe you're lucky and you can find another one with failed amplifiers - buy it and use the parts from it.
You will have to remove the unit to check the Sub amp for failrue of the power section or the output.
Unless the power circuit is checked with a flow chart , starting from the power in, the power supply and supply to the circuits and outputs. any weakness in these sections can cause fault , unless checked the estimate cannot be drawn.
First of all the KEF is a powered sub which means that it wants a line level signal NOT a speaker level. Send the signal from a tape output or pre-amp output to the sub input. The overload is because the impedence load for the speaker output is too low and looks like a short to the amp. Continued attempts to connect the system as described will result in damage to the output section of the amp.
Two things to check. First, the 95VR can be deceiving because it has a "variable loudness" control that some may mistake for volume. The actual volume is controlled by the big up and down arrows on the upper right side. If the volume is turned up, you should see the volume bar graph display show up. If none of the inputs are giving you volume, and the volume is turned up, then try running the output from the processor loop output in the back to another amplifier. The processor out is jumpered to the processor in for normal operation. Missing jumpers could cause a problem also. If there is sound coming to the processor out, then you have a problem with the power amplifiers. Best to refer that to a technician.
Check your Speaker control button. Most receivers have a small button on the front used to control your choice of Speaker Set A, B, A & B, or NONE. It's possible you have inadvertently pressed the button and set it to where no speaker set is selected. Therefore, no sound.
Another probable cause is that one of your speaker cables may have become dislodged at the back, and if your system has an overload control mechanism, it's preventing sound to come out to avoid damaging your output transistors, your speaker system, or both.
The last (I hope not) possibility is that the volume may have been cranked up too high, that either the output resistors may have blown on your receiver, or your speakers may have given out the ghost due to too high a signal.
When an amp won't come out of standby mode when you try to turn it on at the receiver, there is usually a problem in the output section (shorted outputs) and the amp may also display something like "protect" on the display if it has one. There could be lots of other causes but outputs are the first thing I'd look at.
Hello, is this a Radio Shack PA amp or Jamo amp? The unit is probably in "Protect" mode. Is this a PA system or a receiver...receivers have a protection circuit that will not let the speaker relay activate if the amplifier output section is shorted and sending voltage towards the speakers...so they won't fry!!The speaker relay should activate within 3 to 5 seconds if your output section is ok.
The click you hear is the power relay. Normally that would be followed by amother click of the speaker relay. In this case, the output section is in protect mode because of a fault detected. This will prevent the speaker relay from turning on the speakers. This amp will require repair. I don't recall your specific model, but if it has discrete transistors, expect a parts cost in the $20 range. If it has a single output amp pac, then the part could be in the $65 range. Add in the local labor rate for the complete repair cost.