Question about Fleco Professional Karaoke System Shelf System

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Mics = output Volume OK
CDG and tape units = Low volume

Bad pre-amp

I need to buy a schematic print or copy to isolate problem from larger main control board.

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  • 2 more comments 
  • lou69_99 Oct 03, 2008

    I have a CDG-11A that is making a "staticky" noise while nothing is playing and the record volume from CD to tape is low

  • seasidepools Jan 19, 2009

    key change board is not working. heat dump gets very hot on board and shuts down player although grafics continue to show on monitor!

  • Anonymous Feb 25, 2009

    There are no 470mfd capacitors on the small key change board! There is a 100@16 and two.47@50. On the unit I have, there is no tape volume; everything else is fine. Any other ideas??

  • philbeckman Feb 25, 2009

    (third try to post here!!)
    There are NO 470mfd capacitors on the key change board! Two .47@50, 1 100@16. Mine has no tape volume, CD and mic are fine. Any other ideas?



1 Answer

All signals go through the key change board. Electrolytic Capacitors (470 Mfd) on this board were bad - REPAIRED

Posted on Jan 10, 2008


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I need fleco karaoke cdg-11 manual

Try Googling (fleco)(cdg-11)(manual) without parens.

May 30, 2017 | Fleco Audio Players & Recorders

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The volume on technics SL-BD22 turntable will not turn up and stays at one volume

Since the turntable itself doesn't have a volume control the problem is with the amp it is connected to. It should be connected to an amp with a dedicated phono socket. It's no use connecting it to a tape or aux or CD socket. These sockets do not have a built in pre-amp for the magnetic cartridge. If your amp doesn't have a dedicated phono socket then you can buy a Magnetic Cartridge Pre-amp that will plug into a tape socket etc on the amp and have the deck plugged into it. If plugged into a none dedicated socket though you can hear it, the volume will be very low compared to other sources. If you have got it plugged into a dedicated phono socket and the volume is still low, then the internal built pre-amp inside your amp for the deck has failed and will need to be repaired. The pre-amp failure will not effect any other functions of the amp.

Feb 24, 2015 | Technics SL-BD22 Turntable

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Soundcraft Gigrac 1000st distortion in the mic inputs. The rca line in is fine and clean. No effects on the mic pre sounds like its breaking up at any volume level. really dissapointing.

You should be using Dynamic mics such as a Shure SM58. They go into the first FOUR channels and if there is excessive gain and distortion, push in thee Pad button below the connector for those four channels. Inexpensive consumer microphones used with some Karaoke home systems are not suitable for this unit. You should be using XLR cables on the mics (balanced lines). The Pad buttons reduce the gain by a fixed amount of -20 Db for mics that have too much output to be controlled by the gain controls right above the connector. Ideally those should be no less than 12 o'cloock for good signala to noise ratio. Additional channels beyond the first four do not have as much gain and they do not have the -20 Db pad option.

May 15, 2011 | Soundcraft GigRac 1000st Powered Mixer...

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I've owned a Roland AC-90 acoustic guitar amp for 8 months and am having problems with the XLR mic preamp. There is some very low-level output with the volume fully advanced, and with an external...

I don't have the exact schematic... however sometimes they have RF bypass capacitors to ground on the balanced input lines and one side gets shorted. The schematic I do have is for an AC100. It shows a rather unconventional input circuit. You can download it here and it MIGHT be close to your unit:

I note that this unit does NOT have Phantom power so you CANNOT use a condenser type mic with it unless you use a preamp with Phantom power... Maybe that is the problem?

Feb 16, 2011 | Roland Ac-90 Acoustic Chorus Guitar Amp...

1 Answer

The volume on the left channel on my old (20+ yrs) Denon stereo receiver is too low intermittently, usually until it warms up from use, and sometimes after. Ideas?

Problems of this nature are often caused by electrolytic coupling capacitors. If you have access to an audio signal generator. Inject signal at volume control and compare left and right output levels. This will isolate fault to pre amp stage or power output stage. freezer can be very usefull in isolating this type of fault.

Feb 27, 2010 | Denon DRA-455 Receiver

1 Answer

I need advice on how to connect my very old BOSE 901 (with active eq) to this device: Martin Roland MA 3000K I see pre-out and pre-in but cannot locate main-in. Please help here is the back of its image:...

As you probably know, the Bose 901 Active EQ is there to modify the frequency spectrum fed to the 901's so they will produce a flat response. Without it, they sound acceptable in the midrange but lacking in bass. Since they have no woofers or tweeters, the modification is drastic and should never be applied to non-Bose-901 speakers or they could be damaged.

This setup should work for mixing and playing but I'm not sure if recordings directly from the unit's REC Out or Line Out would have the Active EQ effect on them. You'll need to perform a few tests to see how it all works for playback AND recording.

Remove the jumpers for Pre In >> Out

Insert the Active EQ in their place by running:

1. RCA cables from Pre Out to the Active EQ In (From Aux, Tape Out)
2. RCA cables from the Active EQ Out (To Amp, Tape In)

Use ONLY 901's on this amp with the EQ.

The Bose Active EQ has its own Tape Rec/Monitor loop to replace the one it normally occupies in a typical receiver application, so if you wish to record your mix you should use those connectors for your tape deck and there will be no problems with the Active EQ effect being recorded. The Monitor Tape/Source switch on the EQ functions just like a typical Tape Monitor. For playback of the recording, switch it to Tape.

The manual, available at
doesn't get into any detail on the innards of the mixer.

In a typical integrated amp or receiver, the jumpers removed are between the Preamp Output and the Main Amp input, but BEFORE the amp's volume and tone controls, so manipulating them would not affect a recording. You should experiment with it by making recordings through both and adjusting speaker volume to see if it changes.

I would be curious to know what the functional difference is between the designated LINE Out, REC Out and PRE Out jacks in that regard. Normally, Line Out and REC Out will not vary with amp volume, but I expect in this mixer it does, or you wouldn't be able to control the volume from it. Experiment.

Of course, you probably want the mixed effects to be recordable, so I assume they'll appear at all outputs. Play back the test recording (at an initial low level, just in case) and see if you can detect an exaggerated low end (due to the 901 bass boost being applied in recording AND playback through the 901's. If the recording volume doesn't vary with speaker volume and the playback sounds as flat as the recording you're good to go.

If there is are volume variations or an additive effect, you may have to draw the REC Out to the deck's input and run the deck's output to the Tape In on the 901 Active EQ, monitoring only on deck playback.

Dec 02, 2009 | Bose 901 VI Main / Stereo Speaker

1 Answer


Make sure that you have the turntable connected to the PHONO input. If there is none (I don't know your specific model), then you will need a phono pre-amp. Connect the output of the pre-amp to tape-in or Aux in and the unit should work as expected. The alternative is that you may have the tape monitor turned on. Check that as well.
This unit is old enough to have pre-out and amp-in connectors on the back. Make sure that those are connected to each other. Use standard RCA cables.

If none of those resolve the problem, there is an internal problem that will need a bench to resolve.


Oct 26, 2009 | Audio Players & Recorders

1 Answer

Need source for basic assembly info on FLACO CDG - 11.

Fleco is out of business. They offered NO support when they were in business.
The machine itself is a good one when it's working. If the upper unit is out your best bet is to replace it with another unit (using the existing box speakers and amp). If the Amp is the problem it can be repaired by a competent repairman That's willing to take his time. Schematic is not available. I repaired my own amplifier. The biggest problem is capacitors and little 8pin op amps. The parts are dirt cheap and available from several sources. (Mouser and Digi-key)

Feb 15, 2009 | Fleco Professional Karaoke System Shelf...

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