ZED-R16 FireWire bus ground connection check
During the manufacturing process of ZED-R16, two 0R link resistors were omitted from a batch of FireWire circuit board assemblies.
These links join the FireWire bus ground to the circuit ground and, if missing, there is a chance of intermittent connection between ZED-R16 and the FireWire host machine, resulting in audio dropouts.
The procedure to check to see if the resistors are missing or not are as follows:
1) Disconnect all cables from ZED-R16 & turn upside down.
2) Remove all the screws from the base panel (T10 head).
3) Inspect the FireWire PCB (AG7073) to see if R923 & R924 are fitted or not.
4) Also check that the two green wires are fitted to the FireWire board, one to P900 and one to P1310 (SGND).
5) If they are fitted then fit base again.
6) If missing, contact us and we can either get them fitted for you or let you know what to do. (they can be “blobbed” with solder if you have a soldering iron).
R924 (as shown installed at the factory) is a “zero” ohm SMD resistor (also known as an SMD jumper).
If SMD component is missing solder a jumper across the two open pads.
R924 is located in the photo just below connector CN901.
R923 (as shown installed at the factory) is a “zero” ohm SMD resistor (also known as a SMD jumper).
If SMD component is missing solder a jumper across the two open pads.
R923 is located in the photo just below connector CN900.
And this picture shows the green grounding wires.
The top ground wire is attached to PCB pad P900.
The lower ground wire is attached to P1310 SGND (Static ground) (off photo).
Wire gauge should be a minimum of 18AWG.
Terminal lugs should be “ring” style (20-18AWG “red”).
The metallic surface area under and around the sheet metal screw should be bare metal cleaned of any paint or finish.