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Looking for a schematic or service manual Vocopro KJ 7808 RU

The mic1 input does not work through main outputs anymore. It sounds great through booth output. The first op stages look good. The signal is getting lost somewhere in the board

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Posted on Jan 02, 2017

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SOURCE: Casio CT-670 Tone Bank keyboard completely dead

How familiar are you with schematics? I've just found my CT-670, There where marker marks on the keys. I cleaned it up. I took it apart as one channels had no sound. I love this machine. I want to find a manual for it also schematics would be very helpful for me too.
I would suggest looking inside for burns on semiconductors. or loose soldering. I need to replace a chip that has no cross reference... that I've found yet... I think it's an amplifier but need to spend more time on it....

Posted on May 23, 2009

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SOURCE: Phonic Helix Board sound problems

You don't specify which model Phonic mixer in question.
Is it a powered mixer ? And are you plugging your speakers into the speaker outputs ? If it's not a powered mixer and you're plugging speakers into the Line Outputs, you're not using a power amplifier between the line outputs and your speakers - this won't work.
If it is a powered mixer and you are plugging speakers into the speaker output connectors and still getting little or no sound, check your speaker cables and the speakers themselves by plugging them into known good amps.

Posted on Aug 01, 2009

  • 1 Answer

SOURCE: On the ZR-76 keyboard, no output on main or aux output jacks ok on headphone

Ensoniq zr-76 no output signal on the main and aux, but i have output on headphone jack?

Posted on Jan 17, 2010

SOURCE: Very low output

hi,chdavis14 on Mar 15, 2009.the problem comes from the two electrolytic capacitors at the signal exit of the mainboard, or soundboard if you like. Go and have them changed at an experienced technician because they are in a difficult spot.

Posted on Jan 02, 2011

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SOURCE: I've just got an ampkit

If you touch the area where the input and output level bars are (lower right of the screen) it will open a page called "Input Options".
Make sure the input and output gains are up about 75%. Usually the output gain is about 5-10% lower. If you're getting a button that says "No Input" where the input/output level bars should be on the lower right corner, it is telling you that your iPhone headphone/mic jack is not sensing the line from the Amplink. Leave everything connected, and exit the Ampkit program and then start it again. It should reopen with the level indicators showing. These connections are all finicky.

Posted on Feb 02, 2011

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Help with hooking up a compressor for vocals.


The compressor is a really good idea and should be connected between your mixer and your amplifiers. Your "integrated" mixer/amp is a bit tricky in that you will have to "insert" the compressor in the signal path.

If you have the "console" model....

1. "Main 1 Out" left and right to the input of your compressor and the output of the compressor connected to the "PWR Amp Insert."

2. What is known as Tip, Ring, Sleeve patch cable and plug connected ONLY to the "PWR Amp Insert." This type connection breaks out into a "Input" and "Output" using a single 1/4 stereo plug.

If you have the "square box with knobs on front" model

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I have Behringer xenyx 1622fx , It will turn on the power but a few minute the power will turn -off , Please help me to solve the problem of this unit in power supply section or other section.


Here is your schematic:

http://elektrotanya.com/behringer_xenyx_1622fx.pdf/download.html

Scroll down and find link "Get manual" and click to download.. IGNORE other download links they are for third party viewers. Power supply is on page 11. This is a switching power supply running from line voltage. For personal safety USE AN ISOLATION transformer when working on it. First thing is to measure all the voltage outputs before and during shutdown. Switching power supplies often require use of an oscilloscope to repair. The three terminal regulators that follow the main switching supply each have thermal shutdown so if one of them is being overloaded it will shutdown and that voltage will drop way down. Use great caution when working on the supply!!!

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Behringer SX3242FX intermittently looses signal to the left main. When it's out, the the level meter indicates signal on the left, but not the right. This is consistent in both mono and stereo inputs....


Make sure you are using BALANCED cables from this... eithe XLR or TRS cables. Using TS unbalnced cables MAY ground out the signal which is sent as balanced. Here is a schematic for the 24 channel unit... yours just has eight more channels. http://elektrotanya.com/behringer_ub2442fx-pro_sm.pdf/download.html
Scroll down to "get manual" and click to download. Ignore other download links.
By looking at the signal paths, you can OFTEN do a lot of testing from the available jacks. If the contacts on the right main INSERT jack go bad, that would cause your problem,,, NEVER use other than an insert cable in these jacks.

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It sounds like there is a DC bias in the unit. Put a short circuit on the input and then cycle it and listen for the pop when changing state... if it does, then it needs servicing... and POSSIBLY a circuit design change. Looking at typical schematics, about the only problem might be leakage at the input and output coupling capacitors UNLESS you are driving it (playing or having a string sustained during switching). If you have a string still going during switching, you probably will get a discontinuity in the form of a pop.

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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:

http://elektrotanya.com/roland_ac-100ut.pdf/download.html

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?

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IC30 4580 summer for MIC and BOOTH.

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Casio CT-670 Tone Bank keyboard completely dead


How familiar are you with schematics? I've just found my CT-670, There where marker marks on the keys. I cleaned it up. I took it apart as one channels had no sound. I love this machine. I want to find a manual for it also schematics would be very helpful for me too.
I would suggest looking inside for burns on semiconductors. or loose soldering. I need to replace a chip that has no cross reference... that I've found yet... I think it's an amplifier but need to spend more time on it....

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