Question about Korg Pa800 Synthesizer

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Constant hissing noise from left speaker. headphone is working exellend

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The headphones typically use a seperate driver than the speakers.

I don't have a PA800 schematic, but the PA500 uses a power chip part number TPA3100D2 which drives the speakers. ( That is all it really does other than mute the speakers)

IF you open your unit and find a chip with this number on it, it MAY have a problem on one of the two channels. The chip has 48 leads, and would be about 3/4 inches square. It is a dual 10 Watt switching type audio amp. Cool it with circuit cooler spray and if that changes the hiss on the channel, the chip is likely bad.

Unless you are very skilled at working with surface mounted components, you should take this for repair as special tools are required to replace it if this part is bad.

Posted on Sep 16, 2010

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Posted on Jan 02, 2017

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I have a ypg535 and headphones work but no sound from keyboard. I did unplug the headphones.


If you have sound through the headphones but not the internal speakers then assuming there is nothing stuck in the socket, headphone adaptor, broken plug etc then it would point to the amplifier section of the keyboard having failed. Sound via the hip socket is normally from the pre amp stage. Is there any slight hissing from speakers? If so this reinforces amplifier theory as the speakers are obviously connected.

please state model number of the keyboard and answers to the above .

regards

dan

Jul 20, 2017 | The Music

1 Answer

Why does my lowrey organ not make a sound after I have switched it on?


This is a generic answer for this kind of question.
When there is no sound
Check the obvious.
Is there a light on the organ indicating it is on?
  • Plug it in to a known working wall socket, switch on at the wall
  • Switch on at the organ, check light
  • Very old keyboards need a voice to be selected!!
  • Turn master volume up
  • Turn any other volumes up
  • i.e. lower manual volume
  • upper manual volume
  • swell pedals down
Sometimes a sustain pedal plugged into a volume pedal socket will mute the output, check this.
Headphones out, most headphones will turn speakers off, sometimes the headphone switch can be dodgy, work the headphone plug in an out a few times
There maybe a switch that turns off the speakers, look near the output sockets
Software volumes up, check display, if any.
MIDI instruments, check local control is ON
Still no sound?
Can you hear anything from the speakers?
Hiss or hum usually means the speaker is ok
Total silence may indicate speaker failure, but only if there is one speaker, as in older home organs, or smaller keyboards
Try headphones next, TURN Down master volume first just in case!
If there is some sound, very quiet and gross distortion then possible power amplifier failure.
If your instrument has any kind of line out as well as a headphone jack, try these.
The line output will likely be a pair of phono sockets,like you have on HiFi equipment, 1/4 inch, 6.35mm jacks, like the bigger headphone connector, a 3.5mm socket like the smaller headphone connector, or even a DIN connector on older equipment.
Connect these to the aux (or Line or CD) input on your HiFi, guitar amp or similar. (some times these outputs will drive headphones, usually you will only hear anything in the left side). If this works then it is very likely the power amplifier.
Further tests on MIDI equipped keyboards would be to see if the MIDI does anything.
If MIDI out works and there is no sound, and MIDI in makes a sound this points to local being off, buried somewhere in the menu will be local on or off, make sure it is on.
If MIDI out doesn't work then the failure is likely to be internal power supply or something else critical (not nnecessarily major).
Power amplifier failures in newer, low power, keyboards are often the power amplifier chips (i.c,s), older amplifiers may have just blown their fuses but one or more output transistors may have failed.
Cost of repair will be down to the time it takes to get to the fault, taking these to bits and putting them back can take a lot longer than the repair.!
Hope this helps, Chris the Fader

Aug 28, 2016 | Music

1 Answer

My Roland FP8 plays very quietly through its own speakers, through an external amp & speaker and through the earphones. There is a hissing/crackling/static sound too from the speakers. Anyone


A number if things can be wrong with it, from the audil preamp to the the audio amplifier. Even as simple as a bad volume control. Does the actual noise change patterns when you move the volume?

Jan 03, 2015 | Roland Music

2 Answers

Danelectro Hodad Mini Guitar Amplifier - no sound output


Do the cables have the right length plug/jack ends? There are 5 different lengths in use. Some will short the inputs completely.

Do you get noise floor from the amp when turned full volume? if so, it is an input/mute issue. The switches these days are rather cheaply made and prone to dirt or corrosion. Try cycling the switches repeatedly. The same with the jacks.

If there is no warranty left- pull the chassis out and under a regular flourescent light, noise test each part of the amp with an insulated screwdriver- just make a contact on discrete transistors, or on the inputs of the IC's and work back towards the input. If it is clean all the way back-it has to be the cable, cable ends or the guitar.

Jan 30, 2012 | Danelectro Hodad Mini Guitar Amplifier

1 Answer

Behringer ub802 mixer is buzzing even when no input when i hook my head phones into the headphone jack and main output jack


If it buzzes when you have no inputs AND no output leads connected, there is a problem with the power supply... HOWEVER if you have used UNBALANCED output cables instead of the REQUIRED TRS BALANCED output cables, it is possible the noise is being driven backwards and that is what you are hearing. Note that at full gains, there often is a tiny bit of noise, usually hiss. Also make sure the supply is powered from the SAME receptacle as the equipment this drives such as an amp or powered speakers.

Jul 18, 2011 | Behringer Eurorack Ub802 - Ultra Low-Noise...

1 Answer

HISS from Numark DM1200 mixer. Not present in speakers (self powered) when mixer off. Using XLR cables with telescoping ground lifts on each line. Monster 3500 power filter. Ideas?


All interconnected equipment MUST be powered from the same receptacle or source. The XLR to the speakers should NOT have ground lift. The power for the mixer should come from where the speakers are and be routed alongside the XLR cables. All the other connected items should also be powered by the same source. The ground bounce within a building cannot only cause noise, but can rupture the input circuits of equipment. As an electrical engineer I don't know why manuals supplied with the equipment doesn't go into this more. The professionals at the big venues all know this as they have had to pay to get equipment repaired.

Now to get down to "hiss" once you get the other stuff straightened out, there are two things to know at the start: The first is that due to the statistical nature in electronics "noise and hiss" are among the laws of physics that we can't completely get around. The level of the hiss should NOT be objectionable however. The second thing is that proper level setup is important to minimize the effects of noise and hiss. You should be sending the levels to the powered speakers at near full line level into the line inouts, never mic inputs that some have. Using excess gain at the speakers will amplify any noise pickup on your audio lines. Next, at the mixer, try to keep all the level controls around 10 to 2 0'clock for rotaries and 70% for faders. Excess gain at certain stages will cause hiss to be objectionable.

Mar 19, 2011 | Numark DM1200 DJ Mixer

1 Answer

My amp isn't producing any sound. It works when headphones are in but that's it. Please help


The headphones socket is on the preamp stage - it works so the problem must be after the pre-amp.
Do you get any sound at all from the speakers (hiss or perhaps a click) when you turn it on?
If yes it is an amplifier problem.
Here are some possible causes
  • A wire has come off the loudspeaker - easy to fix
  • Speaker protection fuse has blown - small glass fuse mounted on main amplifier chassis - replace with correct rated and type of fuse (note some of these are 'slow' blow type - important that you get the right one)
  • faulty component in the main amplifier stage - requires attention from qualified repairer
  • Loudspeaker burnt out - this can be tested by connecting another speaker across the terminals of the built in speaker.
  • The headphone jack socket automatically disconnects the loudspeaker when phones are plugged in - it could be that the contact in the headphone jack socket is bent and not re-making contact when the headphones are unplugged.

Feb 26, 2011 | Orange Crush 15r 15w Reverb Guitar...

1 Answer

Some Headphones have an inherent hiss noise when they are connected to my wireless sennheiser EK 300 IEM G3 receiver. It seems to be a problem particularly with high-end IEMs which are highly sensitive...


Hiss is a problem of statistical noise in electronic devices due to the laws of physics plus circuit design.

One thing to do is to improve the signal to noise ratio (SNR) by properly setting gains. It is POSSIBLE that the IEM's you are using are too low impedance for the receivers resulting in you having to use excessive gain at the receiver. Your receiver gain control should not have to be above 60% of the way up. If you are above that, the ear buds are probably lower impedance than the receiver is designed for... and remember the manufacturer will LIE on the capability of the thing they are trying to sell.

The receiver is speced at 32 ohm drive... IF your ear buds are less than that impedance, they are NOT suitable. Conversely if they are too high, thaat will ALSO cause you to turn up the receiver gain too much and result in poor SNR.

You want to make sure the transmitter is being driven at line level so receivers get adequate input audio so gain doesn't have to be run too high.

Jan 04, 2011 | Sennheiser ew 300 IEM G3 In-Ear Wireless...

1 Answer

HOW DO YOU TURN DOWN THE HISSING NOISE


You can cut the treble gain some BUT most importantly is to send adequate signal to this speaker so volume level does not have to be set high when sending LINE LEVEL signals to it. Hissing noise is a product of the statistical noise that occurs in electronics. Running any device at high gain invariably brings up the hiss level. Managing thee signal levels is the responsibility of the sound engineer.

ALSO feed ALL interconnected equipment from the same receptacle or power source, even if it means running a power cable to a mixer alongside the snake. ALWAYS USE BALANCED audio cables whenever possible.

Dec 24, 2010 | Samson Auro D415 - 2-Way Active Speaker...

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