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I have a vestax qfo le and I'm only getting sound from one channel on the master out I have cleaned the headshell changed leads and I'm stuck. Does any one know of someone who could fix turntables in the south west prefrably in Plymouth Help Sam J

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Sam, I have a silver QFO and just recently I had problems with Phono/Line 1 where I lost sound but Phono/Line 2 (I use for IPod) was fine.
I took the fader out and cleaned it, checked wiring connections inside and tested and it was ok and I could use again..
Then during a skratch session, the Phono/Line 1 just lost sound again. If I turned my speakers and the QFO volume right up, I could hear very distorted sound.
I turned off by the power switch on the back of the QFO and turned on and I got a long hissing sound which died out. I still had no sound.
I turned off and back on and this time there was no hissing sound and Phono/Line 1 was ok.
Every time I get this problem now, I just turn off and back on a couple of times and the sound comes back.
I think it may be something to do with the sound control unit inside.
I know that this is not really a solution but your not alone with your problem.
I even had one of the feet fall off which I had to supa glu back together.
I have tried contacting Vestax but they wont reply.
I dont know about you but I was disappointed with the build quality of the QFO. Feels cheap and not your usual high quality Japan build.
I bet Q'Bert does not get any of these problems!!!!!!
Peace
Paul

Posted on Jul 26, 2009

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The right output channel on the right side of my pmc 05 pro 4 has very low output. I can hear both right and left output channels in the headphones when I have the cue selected but when I try to monitor...


I assume you swapped thee output leads as well as the inputs which you di mention, to verify you amps and cables...
The Vestax schematic I have is NOT your same model, but the companies often re-use circuitry. In the schematic I have it appears that the two channels go through two levels of NJM2068L op amps.
In these two levels there is both a master gain control. It is important to know whether the gain control varies the output level of the right, even if it is low. Also in this gain control area is a master balance pot which varies the ratio of the left and right and is CAPABLE of taking either channel to near zero output... IF you have that control check it for sure !!! The pot is a dual employing both an A taper and C taper which is a reverse of the A.
The right tool for troubleshooting this is an oscilloscope, but first an inspection looking for board cracks around the output and pot area is in order.

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Had the amp 4 months and getting no sound apart from loud clicking noises when the speakon leads to the speakers are plugged in,ive gone as far as knowing its amp and not speakers/leads etc.its not had...


If the click is a one shot deal when you connect the speakers, I'd suspect that there is DC current on the outputs. Check using a DC voltmeter. You should read less than 0.5VDC. If you read more, there is a problem with the output section. Since this unit is new, it should still be under warranty. DO NOT open it up. If you read DC, return the unit for warranty service.

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I have a Thorens TD115. The left channel doesn't


HELLO
I am basing my findings on my THORENS TD166 MK2.
First thing you have to do here is check the wiring from the headshell to the RCA phono leads - for this you need a multi-meter set on continuity.
Disconnect the cartridge and put one meter probe on one of the headshell wires and the other to the centre pins and outer rim of the RCA plugs. One headshell wire should read fine on one part of the plug as it will correspond with ONE part only of the RCA plug. When you have checked all wiring and you get a continuity check (OK) then you must look to the cartridge.
However, if you get a reading of ONE headshell wire reading more than one part of an RCA plug then you may have an internal wiring problem in the deck.
Here is something that might help:
HEADSHELL:
RED - to centre pin of right output plug GREEN - to outer metal rim of right output plug WHITE - to centre pin of left output plug BLUE - to outer metal rim of left output plug In some cases this wire may be black
Just to recap, if these readings are OK - the cartridge may be at fault.
I wish you well with it!!! (:-)

Sep 25, 2009 | Thorens Audio Players & Recorders

1 Answer

Sound only coming out opf left channel


Probably there are dirty contacts inside the assign switch, also it could be a bad solder contact on the switch or there around.

The switch can either be removed and cleaned or replaced.

Cleaning is a bit delicate procedure, but can actually be done, you need to take the switch apart, taking care not to damage any of the parts, then you need to clean the inner contacts and the contact making clamps with some fine sandpaper.

Be sure to put everything back together as it was otherwise the switch may not work properly or it may not work at all (be gentle with the contact making clamps, they can easily be damaged / squashed).

It could also be a problem with faders or preamps, but i would take a look at the switch first.

regards

3rq8 (Triarcuate)

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Vestax pmc 06 mixer / Virtual DJ Mix station


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Oct 19, 2008 | Vestax Pmc06proa Thin DJ Scratch Mixer...

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Technics1210, the treble and midrange is very distorted, tried different needles and swapped channels but other deck still sounds crisp and sharp, been told it could be the leads????? from dan h.


hi there, yes there's a chance it is ur leads that are the problem.
Have you tried other needles/headshells in the problem deck?

A bad headshell connection can also possibly be to blame.
Firstly i would suggest that u unscrew the headshell and have a close look into the end of the tonarm.
The 4 little contacts in there are supposed to be sprung a little, check that these aren't "stuck". Sometimes they get stuck all the way pushed in (usually a result of dirt, age, or most likely - headshell has been overtightened).
also check they are clean, if not use a cotten bud to carfully clean them.

Not the problem? try checking:
- Check the headshell contacts are clean, i find buffing the headshell contacts by carefully and vigorusly rubbing the base of the headshell on my trouser leg (or a dry duster streched over my leg) an effective way to get them nice n shiny :-)
- Check the 4 little wires connecting the catridge to the headshell arein good nik + connected properly (google search if u need to check which way they go)
-if none of these help then I would suggest checking with a continuity tester/multi-meter from each of the tonearm springy contacts to the phono plugs. Each spring contact should bell through to one of the phono connectors contacts, check all 4 wires bell through, failing this put ur meter on ohms and repeat this step checking the resistance when belling them out, find 1 with a high resistance then thats your problem.
Hope this helped
:-) Dj E-mission

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1 Answer

Intermitant channel down


Hey, I'm having the same problem. I found this with a little help from a small site I found called Google:

http://www.divdev.fsnet.co.uk/repair3.htm

Here's what he suggests. I have no clue what it means but I'm sure that it cane be decoded with some manuals:


Technics SL1210 , 1979 ?
Intermittent loss of one channel.
The headshell was slightly loose on the tonearm
and moving inwards would cause loss of one channel.
To remove this arm undo the slotted lock ring at the very top
of the arm pivot and undo the central pin. The arm
with jiggling can then be removed assuming enough slack in
the signal wires. Undoing the 2 watchmakers screws near
the headshell allows removal of the 4 pin connector.
Presumably the wires inside the tone arm at this connector
could touch the inside of the tonearm and lead to
break in sprung connection. Placed a bit of brass shim
in the slack area and pushed back in to wedge tight.
Also removed the soft washer on the plug shaft of the headshell.

May 26, 2008 | Technics SL-1210 Turntable

2 Answers

Single sided sound from my RCA/Phono leads


If you are certain the new leads/RCA cables and the soldering work was done properly, and you've determined that the issue is from the turntable and not your mixer.

Then there are 2 other factors that could be causing this issue:

1) Bad Tonearm - look inside the tonearm, where the cartridge/headshell mounts. You'll see 4 prongs. Make sure those prongs are protruding and they all look even. They must also be a nice shiny brass color. If they are dull and/or black, try cleaning them out with an contact cleaner (CAIG Lab DE-OXIT works good) made for electronic components. If any of the prongs appear to be pressed in, try to see if you can get it to bounce back. Those prongs are spring loaded, and sometimes the springs get misaligned. Of course, they also tend to dislodge. If that's the case, then you will need to replace the tonearm altogether.

2) Faulty Cartridge / Headshell - Make sure your cartridge & headshell work properly. The easiest way to do this, is to swap your cartridge with a working one. If you have 2 turntables, just swap them out, and see if that changes anything.

I am going to say, it's more than likely a tonearm issue. There really isn't anything else, other than the Tonearm and RCA's which would cause sound issues. The Circuit board will not affect your sound, unless you burned it, or damaged it in some other fashion when replacing the RCA cables.

As for a Service Center in the UK, not sure of any, but you can contact Panasonic, which is the parent company of Technics - www.panasonic.co.uk - go to the Support Section for a list of auth service centers in your area.

- TWEAK AV LAB
The ORIGINAL TURNTABLE Technicians

Nov 30, 2007 | Technics SL-1210 Turntable

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