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Equivalent ic ka7552njm 4558 - Behringer Music

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How can i find if one of my channel not working

Apply a music or tone source to each input one at a time and see if signal comes through.

If you have 2 channel output, when the music or tone is on an input, switch it between the 2 outputs. It may just be dirty swith contacts, fader contacts, dirty or damaged interupt contacts on the jacks, or even the wrong length if using unbalanced or balanced 1/4 inch plugs.

If one channel is dead, you use a scope on the chassis at each amp IC chip/stage to see where it drops out. Even without a schematic you can loctate the 4558 IC's or the TL074, TL072, or TL071 inputs and outputs on their respective data sheets and use those to navigate the audio stages in the chassis.

Oct 28, 2012 | Music

1 Answer

Need schematic for Crate PCM-8 DP+

Without a schematic you can still trace the circuit to locate the fault.

Put a music source or sound source into the bad channel and a good channel, and with an oscilloscope or with a pair of high impedance headphones with test leads on the ends- you can set up a low z headphone with an impedance match trasformer, make sure you have test prod ends on one of the leads. The other can go to a chassis ground. Start at the input and work your way forward comparing the signal between the good channel and the faulty channel. When you lose the signal or you encounter severe distortion, you are in the vicinity of the defective part.

Common failures are a Deffective 4558 or TL072/TL071/TL074 IC chip. You may have a faulty electrolytic capacitor, or even a faulty bypass caoacitor in general. Bad solder connections, even a broken fim resistor.

With the IC chips, the usual power pins for an 8 pin plastic or ceamic DIP are pins 4 and 8. usual outputs for the 8 pin are 1 and 7 the remaining pins are the inverting and noninverting inputs. 2 and 3 and 5 and 6.

Also check switches and especially those with interupts on the input and output jacks- they can get dirty.

Apr 10, 2012 | Music

1 Answer

High/low gain not working when guitar plugged in

Switch may be dirty. Clean it with some contact cleaner. Also check to make sure you have the right length plug tip and conductor count for the jack. There are 5 lengths in use.

It is a solid state amp so it is possible there is a faulty gain stage in the preamp/driver section. If the amp is an old one more than 18 years old (give or take) it is possible there is an electrolytic capacitor in the gain stage of the "High/Low", switch. It would be in the vicinity of the wiring from the High Low switch where they solder to the main board. It like is one of a few low noise Op Amps, 4558, 387, TL08X/TL07X/TL06X LF353 series. In the 8 pin IC the pinouts are the same, the characteristics are similar. The most basic feedback configuration is just one resistor connecting an input to the output.

Apr 10, 2012 | Peavey Music

1 Answer

Behringer XENYX 1202FX Mixer

It is possible one of the IC's failed.

You can apply an audio signal to the input and with a small amplifier with speaker you can trace through the circuit to locate which IC failed.

The input to the small amp split iattach 2 wires pr test least leads from a meter, ground the ground lead of the little amp to the mixer chassis, and then with the other wire/test lead trace the defective channel 1 IC at a time until you lose signal.

If you download the IC's data sheet, Most likely a 4558 typse, you can speed the testing by simly testing at the amplifier inputs and output of each section of the IC. When you lose the signal, you found the offending IC- use the other channel for compairison.

Digikey has a site search, so you can enter the number on the IC to find if they carry it, or a similar IC, and who makes it- on the item specification page there is a link to the datasheet. While they may not have all of them, they have quite a few.

Apr 01, 2012 | Behringer Music

1 Answer

Where to find schematics for M-audio projectmix i/o

Most likely they use 4558 IC's which come in a number of packages and are the most common low noise preamp chip, which can be ordered in bulk from Digikey,

If the IC has a different part number on it- they can enter it into the part search to see if a comparable unit is available.

Mar 30, 2012 | M-Audio ProjectMix I/O

1 Answer

Marshall 80RCD Boost channel is distorted and low volume

It could be a couple issues in that section. Start by cleaning the contacts and switches to make sure it is not dirt. Also check to make sure the plug you are using is right for the jack- just to make sure everything is connecting as it should and nothing is inadvertantly getting shorted- such a 2 pole plug plugged into a 3 pole jack.

If those are all okay, the issue is in that boost channel section. Check to see if you are getting both power rails at the IC's, measure on a 4558 chip pin 4 to chassis should be -15 volts and pin 8 should be +15 volts to chassis. if you do not have this voltage, check the wiring, check the PC board for bad solder joints and check capacitors. Also check the physically larger resistors.

If you have the voltages, put an audio source on the input and set up a headphone with test leads, or better- an impedance matching transformer with test leads on the high impedance winding- put one to ground, with the other lead, move from IC to IC to locate the area to look at. You can get a data sheet for the 4558 here: It is a low noise version of the 1458 family of op-amps. Check each IC at the inputs and the output, once you locate the stage where inputs are clear and output is garbled, that IC may be the fault, or something in the vicinity- usually it will be the IC. You can get any configuration of the 4558 you need through Mouser or Digikey, and Digikey does ship worldwide

Once you get the new IC in, you should be groovin in no time.

Jan 30, 2012 | Music

1 Answer

Marshall valvestate 2000 avt no effects

If just no effects, look for a loose ribbon wire. Check footswitch and make sure the plug and jack are fully mated.

It is possible you have a defective 4558 IC, about the only way to locate the problem IC or transistor quickly is to "buzz test" the circuit. You may need to have an audio input of some sort pugged in as well to get the effects to respond. Expose the bottom of the chassis, and with a screwdriver begining at the output, work your way back through the stages/ICs until you lose the signal. Since you seem to indicate it is at the effects, begiin where they end.

Also make sure the solder connections are sound.

Pin 3 and pin 5 are the positive/noninverting inputs to the 4558 series of IC.

Jan 27, 2012 | Music

1 Answer

I'm not getting any sound out of one of the balanced master output. How can I get this repaired?

The typical cause of this is a failure of the buffer IC (usualy a 4558 or 4570). This is a relatively simple repair that should be easy for any audio repair shop. The part will cost about $2-$4.

Post your location and I may be able to refer you to a local shop.


Jun 22, 2010 | Numark DM1200 DJ Mixer

1 Answer

Older Cr 1604, powers up but no output, suddenly after gig.

The power supply is located in that area on one side. It is possible that one of the output op-amp ICs has failed. There are a number of 4558 ICs used as output buffers for this unit. Without seeing the unit and testing parts of it, I can't say for sure. These are not the easiest to work on as they are really compact. Where are you located? I may be able to suggest a service center in your area. The repair cost should not be too bad. The parts are cheap and readily available. Please update this with your location. Thanks, Dan

Jun 06, 2009 | Mackie 1604 Vlz3 16 Channel Mixer

1 Answer

Input clean is very low almost not there. switching to OD works fine.

If memory serves me correctly, these units use a 4558 OpAmp Ic. Both inputs pass thru this IC. One side provides a clean amp stage and the other is set up to run in a higher gain mode. This IC needs to be changed, It should be a small IC with 8 pins.


Mar 06, 2009 | Marshall Mg15dfx 15-Watt Combo Guitar...

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