Quote: Replace R24. It WAS 330K. Change it to a 240K. The resistor is an 0805 sized package -- I used a 5% part. You could alternately solder a second resistor across this one, leaving R24 in place. If you do this, use a 910K resistor and solder it across R24. You can even use a leaded component, if that's more readily available.

Anyone know if there is a variance available to make hte 910k resistor work? can I use a 800k or 1 meg resistor? The 910k seems harder to find locally, and I don't need the 100 pack of them I can find on the internet. :) Thanks!

Murph

OFA 9910:

R24 = 220K
R23 = 330K

I removed R23 and replaced it with a variable resistor 0 - 500K. Don't know the final value but it should be under 100K.

IR noise diminution = 90%

Curious-- why would you change r23 instead of r24? Does it matter? I wound up buying a 500 pack of resistors at RS, but the 910K isn't in there... a 1M is, and a 800k... so since I'm new to resistor work, not sure what my options are overall. But a 500K at R23 doesn't seem like as much of a change as a 910K at R24. (Like I said, I'm new at this! :)

If I'm reading up on this correctly, a 1M and a 10M should get me close the 910K, as should a 2.2M and 1.5M in parellel? Or would I be better off going with (2) 470K resistors in serial?? Or doesn someone simply have a spare 910K they could share? lol (Can only find em by the hundred online, and no go at RS! Thanks for any help!

Murph

OFA 9910 = One for all 9910. Radio shack and One for all should have the same base station as Edmund wrote. But, on my base station, R24 was 220K instead of 330K. I found that R23 was 330K, so I removed R23 and changed it for a variable resistor of 0- 500K. There is a little screw on it that let me set the resistor from 0 to 500K. After playing with the resistor a bit, the problem has gone. When I bought the variable resistor, I also bought 220K, 330K and a 910K. I have tried the 220K in R23 but it has not worked. It is pretty easy to remove the resistor that is already there, so you can try it if you have a resistor near 240K.

Well, I'm having this problem, and opened up my unit. I don't think the old 25W pencil iron is going to do it. I have an extra base unit and don't mind trying, but could use some advice, never having desoldered surface mount parts. What sort of tool should I have? What's the basic technique?

I googled around a bit, and the idea seems to be that you just heat the part up and "wipe it off" (correct)?

I'm thinking of putting in a variable resistor: how does this sound (from RS):
1K-Ohm Horizontal-Style Trimmer Micro-size. Rated 0.1W, 50VDC.

Thanks for any help.

25W pencil iron should do the job


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