Joined: 05 Aug 2013
|Posted: Mon Aug 05, 2013 8:38 am Post subject: you need to clean the faders etc
| If you are having erratic volume and scratchy noise problems then it is most likely a button contact switch, turn knob potentiometer and or fader problem, common with Fostex VF machines. You will need to open up your VF and get to the contact switches and faders underneath your top panel. You will need to blow out any dust and dirt first(especially remove any dirt/hair/dust in fader columns),
Secondly, you need to take some Caig D100 ( it is best to buy the 25 ml. or 5 oz. dropper bottle with needle tip, it is cheaper in long run rather than spray bottle, too much waste) contact cleaner and try to get a few drops into each contact switch and fader on the circuit board and work it in by pushing on the buttons rapidly with your finger and or by moving/sliding the faders up and down to get the cleaning fluid inside the contact buttons and contact paths. (you can find all Caig products on Amazon and eBay for best prices)
Then you should take some Caig F100 fader lube and put a few drops in the contact buttons, and faders the same way as described with the Caig D100 contact cleaner, first clean then lube. That should solve any button problems, and or fader issues. If that does not work fully then you will need to un-solder and re-solder on some new button contacts. The fader clean and lube should always work successfully on faders most of the time.
You can get some electronic parts online at eBay and other electronic supply stores if you know what you are doing, if not turn your machine into a Fostex service center.
Finally you should do the same clean and lube with Caig fluid to any potentiometers volume control knobs or pan controls that are acting up too, scratchy noise when you turn the knob, same cleaning and lubing procedure described above applies to all turn knobs and dials you have on this Fostex machine, and or any other piece of electronics gear you may have issues with.
Also it is good to put a few drops on each 1/4" plug insert and plug-in connection, also on any internal plug-in connectors on the circuit board as well, oxidation to even gold connections can occur especially if you live by the sea, or in the sea on a boat especially. Caig products will de-oxidize any analog physical moving connection problems, oxidation is what causes most audio volume and static level problems and also electronic issues.
An additional important VF machine tip:
On your Fostex VF machine push and hold down the shift/stop and track 9 buttons together to get into the VF machine Button Test Mode. You can then test all buttons to see if they are working or not and how well they are making contact by pushing down any button, make sure to test all buttons. To get out of this Test Mode hold down shift/stop and master buttons to return to normal operation on your VF machine.
Hope this helps and sorry for being 5 years too late to answer.