Hi, When I connect to HDMI into the amplifier there is sound in the TV but there is sound coming from home theater speakers...

SOURCE: How do I connect a subwoofer to an amplifier marantz pm-68

double up the speaker and then use the two extra screw to hook sub and center

SOURCE: Have Rotel RB-1080 stereo power

Try to plug a set of headphones into your amp.

If only one is working this means that either you're not getting both signals into the unit (check the signal input connectors, resolder any bad contacts), the signal doesn't get to the preamp or from the preamp into the power amp or the signal does not come from the power amp (check solder connections on preamp and power amp components, also check internal connectors - unplug, clean, reconnect).

If both headphones work well instead, then you're getting both signals into the unit and the preamplifier and the final amplifier are OK, since many amps derive headphone signal from the power amplifier via some power resistors - check for any power resistors around the headphone plug or in the section that has wires going to the headphones plug to see if this is the case - if it is, this means that the signal does get amplified, but it is not getting from the power amp to the speaker - in this case, check the following:

--- speaker connector solder contacts on the circuit board could have some damage - resolder if necessary


--- A / B speakers selector switch (if there is one, it could be a physical switch or a soft touch button driven relay so check for both) - there might be a bad solder contact on the switch pins or the switch / relay contacts may be dirty - resolder and/or clean the contacts (if they can be easily accessed).


--- final amplifier section: bad solder contacts on any power transistors, voltage regulators, power resistors, diodes, coils or other components, including internal connectors (anyway, if both headphones work well, these are all unlikely because the power amp is sending both signals out OK, however, you may want to give it a check, just in case...)


--- delayed speaker turn on relay or other relays - check for dirty relay contacts, clean with some fine sandpaper (you need to remove the relay cover which can be a bit tricky / difficult to access, mostly it's a snap-on cover, could also be resin filled and therefore impossible to open).


It could as well be a bad power amp (do the headphones test), the above suggestions are just a quick look at some common audio amp problems and possible solutions.

Also, if your unit has got many hours of use, it would be fair to check the input signal connectors - the solder contacts do get damaged when you plug / unplug the RCAs many times.

Hope all of this is not getting too lenghty and confusing... just post me some feedback if you have questions.

regards

3rq8 (Triarcuate)

SOURCE: Hi, Peavey Classic Guitar amp , Has NO SOUND

Hi Mike,

If you switch on the amplifier, do you hear nothing at all?
Or do you hear low level noise or hum out of the speaker?
Don't know if you're technician.
If the tubes are glowing, you can measure the high voltage.
Check also fuse 3 and 4, thats the neg. voltage -27V and -14V.


regards,
Gerard

SOURCE: Crackling sound from right speaker only

I'm not familiar with that model but I am familiar with the problem. If your unit has a volume knob or a balance control which is a potentiometer you need to clean them. Go to www.mcmelectronics.com where you can find spray cleaner. I like to use blue shower as it works well and will not hurt any components. When you get the cleaner unplug your unit and locate the volume control and any others which have a rotating knob. Usually near the top is a small hole which you can spray the cleaner in. Rotate the control and follow through several times. Try the unit and it should be ok. If it isn't you will have to replace the controls as the resistance material has worn off and they cannot be repaired. Let me know how you make out or if you need anymore help.

hardrocko

Thanks for using FixYa

SOURCE: Marantz PM-48 connecting to TV

look on the back of the TV and there should be L/R audio outputs (white & red), connect this to a spare input of your amp via a connecting lead eg. AUX or any other input except PHONO.

hope this helps.