Question about SpectraVideo Logic 3 Phantom (JT250) Joystick

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Logic 3 Phantom (JT250) Joystick - SpectraVideo Logic 3 Phantom (JT250) Joystick

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Posted on Jul 10, 2016

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SOURCE: cant find driver download for logic 3 joystick

this website is a different language but it

pretty self explanatory HERE

Posted on Mar 28, 2009

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SE2200a rapid signal drop off


I had the same problem with my Saffire: the phantom power voltage quickly drops when switched on, causing the mic to cut out. This problem is common in older Saffires, and is well known to Focusrite support (a modification in newer-production units solves the problem).

The problem is that a tiny 100 ohm surface-mount "chip" resistor in the phantom power circuit fails due to insufficient power-handling capability. (This is "R196" in the phantom circuit.)

The fix is to replace the "chip" resistor with a "normal" 1/2 watt metal-film resistor (with wire leads), mounted upright on the circuit board.

I replaced the resistor myself, following directions (and photos) sent to me by Focusrite Tech Support.

The procedure is somewhat fiddly (a Swiss watchmaker could probably do OK). If you've never soldered before, DON'T EVEN TRY THIS, and if you've never worked with surface-mount components, I would ask your electronics-hobbyist buddy to do it for you.

Here is the procedure sent to me by Focusrite:


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Dismantling the Unit

Remove the 7 screws on the rear panel.
Remove the 4 screws on the underside of the unit.
Lift away the metal cover.
Remove the 4 small black screws securing the MIDI In/Out sockets.
Remove the single screw securing the S/PDIF In/Out sockets.
Remove the two screws securing this PCB to the chassis.
Gently pull the PCB away from the rear panel and move it through 90 degrees towards the front panel.
Place the unit on its front and support the PCB with some suitable non-conductive item.

Modification Procedure

All the components mentioned are located in the same area on the same PCB (see photo).
It is best to remove the coil and capacitor (as shown in the second photo), as this gives easier access to the components.
Remove R196 and measure its resistance. If it does not measure 100 ohms, replace it.
Use a conventional type (100 ohms metal film, .5 or .6 watt) mounted upright as shown in the photo. Before fitting this resistor, check that the three zener diodes DZ11, DZ12 (22v) and DZ9 (3.3v) are OK and have not shorted out. (Diodes are 500mW, 5% tolerance)

Testing units for Phantom Power problems

Connect a condenser Mic or suitable dummy load* to Channel 1.
Engage +48 switch.
Measure the DC voltage between XLR pins 2 & 1 on Channel 2 Mic Input XLR.
Faulty units usually read around +28Vdc and the voltage gradually drops.
Good unts will measure +48Vdc +/- 0.7Vdc.

* Dummy Load for testing: Solder a 20,000 ohm resistor between pin 2 and pin 1 of a male XLR plug and another 20,000 ohm resistor between pin 3 and pin 1 of the same XLR plug.




Here are the photos:


9091702.jpg


2a48ecf.jpg


d4628df.jpg



My Saffire has worked perfectly since I replaced the bad resistor.

Good Luck!

Ken

May 04, 2008 | SE Electronics SE2200A Professional...

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