Stuck @ R72 and R68 ot is it L1 and L2????? Help

[yavuz]

I have 5 parts that I do not know where to put.

2 of them look like resistors and they have exactly 1 Black band on them. Where are they going? Assembly picture shows them on L1, L2 but I want to make sure.

So, I have those 2 and also 2 little blue boxes that was in the resistors plastic bag. Where do those go?

Help please...

[tele_player]

L1 and L2 are optional 'load isolators', they're appropriate when running the output into a capacitive load, such as a VERY long (like, hundreds of feet) cable. When they're not installed, you'd use a piece of wire in position L1 and L2, or a zero ohm resistor, which is what you've got. Check those guys with your ohm meter.

The blue boxes... any markings on them? How big are they? Are they visible on the photo of the C84 on the 'About the C84' page?

[yavuz]

If we look here at this picture...

Li and L2 is obvious and I actually found the blue boxes are the ones that are higher to the right with the adjustment screws.

So, you are saying L1 and L2 in the picture is optional so I will not put them in.

I am planning to get this XLR-F panel and this patchbay So I will wire the panel to XLR cables in to SCA Pres inputs and outs to the patchbay outs of patchbay to 002R so I can insert Comps in the future.

Then I would not need the L1 L2 right? Cabling will be in one rack.

[tele_player]

The blue boxes with screws are potentiometers R68 and R72, used to adjust the supply voltage for the op amps.

I usually check off parts on the BOM as I install them. If anything's left over, the unchecked ones are it.

No, you don't need to install the isolators, but you DO need to install the zero ohm resistors in their place.

[yavuz]

No, you don't need to install the isolators, but you DO need to install the zero ohm resistors in their place.

Oh, OK. I guess zero OHM resistors are the ones with one black band on them rght? I will measure them again but I think they were not exactly zero but very close to zero.

[yavuz]

Do you measure capacitors?
If you do how?
How should I set my DMM?
I am asking because some settings can cause shock the manual says.

Should I trust the markings on the capacitors or should I measure them?

[tele_player]

Some multimeters can measure capacitance. The ones that can are limited in the max they can measure, so they can't measure the big filter caps.

Parts are pretty good these days, you don't really need to measure them to catch out of spec parts. I measure all the caps that I can, as I insert them, just to make sure I'm grabbing the correct part. I measure all resistors for the same reason.

[yavuz]

OK, my DMM haz ACV, DCV, Resistance and DC Amp settings.
Do I use the DC Amp settings to measure the caps?

[tele_player]

No, your meter doesn't measure capacitance.

The warning about getting shocks when measuring capacitors comes from the fact that capacitors, by their nature, store a charge. Large capacitors, like those found in power supplies, especially high voltage power supplies, can store enough of a charge to kill you, even long after the device is disconnect from mains power.

However, handling the capacitors in a low voltage circuit, especially one which has never been powered up, is completely safe.

[Ken Schumacher]

The instructions said these parts are optional so I didn't put them in. I get no audio out, however, and reading this thread it looks like those parts are required. Is that true?