Question about Vestax Pmc06proa Thin DJ Scratch Mixer System

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Both Jack Plugs have NO output

Can you supply circuit diagram / schematic so I can trace fault?

Regards Bill Finney

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  • dj rex Apr 03, 2009

    I have an first generation 05pro and the rca outputs stopped working.  It just hums. Does anyone know how to fix it?

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Ger a convertor

Posted on Dec 18, 2008

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What is the cable not supplied with the rt151 that i need to install ,the cable plugs in the front of amp then the out audio of the tv of th


Typically, the cable would be a mini phone jack cable. The connectors would be called either 3.5 millimeter or 1/8" phone plugs. Some cables have the 1/8" jack on one end and the other end might have 2 RCA connectors. The RCA connectors are also called phono plugs. According to the specs I have found, the system has both phono jack and a mini phone jack. The cheapest solution is a 1/8" stereo male to 1/8" stereo male mini phone cable. Here is a link to a place that several types to choose from, as well as pictures:
http://www.cablesforless.com/Sub-Mini-35mm-Stereo-Phono-Cables-C13.aspx?gclid=CMX96M_aq7MCFaOaPAodC1QAyQ

Oct 31, 2012 | Audio Players & Recorders

1 Answer

CANT GET OF STAND BY


In most cases the standby light might blink with different rapidity to indicate a fault relevant to the processor. It is possible that most of these indicate that there are errors in the processing section. Since there is a possible short or leak in the circuit the output driver section can take in huge current to trip the SMPS or from advice from the micro processor. Remove the power plugs and make sure that high voltage sections are discharged of the potential stored in capacitors. Look for visible signs of leak or of busted capacitors. Look for bulged capacitors or damaged components- burnt or busted. Use a multi-meter to check the continuity or shorting in components, if so detach from circuit and test. If the voltage builds up and the set power ON and then shuts up then the suspected section must be checked in detail.

The processor must have the +5 voltage to the function properly, the +B and secondary voltages also must be checked to infer the fault. Trace with caution and in running through the signal path , circuit trail.

Oct 07, 2011 | JVC DD-3 System

2 Answers

The unit won"t power up


Please check the power supply to the unit, if the fuse or the main power is faultty. Now if the set has tripped then this can be a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

Jul 06, 2011 | Coby Audio Players & Recorders

1 Answer

I bought an HB954WA unit 2 years ago I know they are out of production there is no sound from front speakers The rear wireless work with volume on high all wires are connected could it be a problem with...


I don't have the specific schematic for this product, so I'm writing a generic troubleshooting guide. Your actual configuration may vary from what I assumed.

Check the front speaker amplifiers. One or both of them may be shorted (will blow a fuse or a speaker protection circuit will keep the speaker relay off). If the amplifiers have individual transistors at the output, check for a collector-emitter short or source-drain short on each one. If they are integrated power amplifier modules, check for shorts between the output and both of the power supply terminals on the module. Use an ohmmeter with the unit unplugged for this test.

If the amplifiers pass (i. e., do not read a near-zero resistance on any device) and no fuses in the amplifier circuit are blown, and you are sure the unit controls are set up properly, the next step is a live test to verify the front speaker relay is turned on and the sound source controller is feeding signal to the front amplifiers. You'll need an oscilloscope to do the last test.

Jun 17, 2011 | LG Audio Players & Recorders

1 Answer

My Yamaha Remote control for RAV254 WE45870US stopped working and when I opened the case I noticed a component missing from the PCB. I require a schematic diagram to identify the missing component...


It isn't uncommon to see an empty spot on a PCB since they are often designed to accept additional integrated circuits to accommodate more complex functions and/or future updates. On PCBs for larger devices such as TVs, there are almost always other parts 'missing' for the same reason. The chance that a component has just gone missing is non-existent.
To check if any IR remote is at least putting out some kind of code train, you can use any digital camera or camcorder, hold the lens end of the remote towards the camera lens and 'take a picture' while holding down any button on the remote. If the remote is outputting IR signals, you will see this on the resultant digital 'photo' as white spot or spots.

Mar 24, 2011 | Yamaha Audio Players & Recorders

1 Answer

Very loud and high pitch sounds from the subwoofer


This can be serious as the sub woofer driver or the feed circuit is faulty.
Unless the unit is taken out which is important the circuits cannot be traced. Try to disconnect the input and confirm the output or the line of signal path must be traced using a audio till the suspected noise producing section is isolated.

Mar 19, 2011 | Bose Lifestyle 8 series II System

1 Answer

SP-PWM505


MOst of the time it is the jack that the cable plugs into that has the problem. .
Also the jack is not broken but HAS broken the solder connection TO the jack.
If you know someone who can safely take it apart and solder, let them try.

Feb 07, 2008 | JVC TH-M505 System

1 Answer

Ciruit or block diagram of pioneer home theater system


Hi,

The (schematic) circuit diagram is included in the service manual. A downloadable pdf copy is available here.

Hope this be of help. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Jan 13, 2008 | Audio Players & Recorders

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