Making sure my numbers are correct...
According to the M100 Service manual, R91, R94 and R99 were 5.6K Ohms.
If I wanted to add in a resistor in parallel to bring it down to about
330 Ohms, it appears that I would need to use a 350 Ohm resistor, based
on the parallel resistor equation:
* 1/Rfinal = (1/Ra) + (1/Rb) + ...
* 1/330 = (1/5600) + (1/350)
* 1/330 = (350/1960000) + (5600/1960000)
* 1/330 = 5950/1960000
* 1/330 ~= 1/329.411764
Again, this is assuming the service manual is correct:
https://archive.org/details/m100service/page/n73/mode/2up?q=R91
Personally, I'll just replace R91/94/99 resistors outright... but in
case someone else reading this would rather add a resistor in parallel,
then this should work right. Of course if you have no 350 Ohm resistor
handy, you can just connect different ones in serial until it adds up to
350 Ohms (like 150 + 150 + 50). And ABSOLUTELY make sure your own
numbers are correct, like maybe your R91/94/99 resistors are something
other than 5.6k Ohms; don't just take my word on it!
— Philippe
On 1/15/2023 1:03 PM, [email protected] wrote:
Yes, that would work too. If I am recalling correctly when I was
experimenting with this problem, before getting hold of the tech
bulletin I put something like a 10K in parallel and it was enough to
make it ?just? work.
If I fitted a resistor in parallel instead of pulling the original and
replacing it outright it would gnawl at until the end of my days. Yes,
I have done such hacks when out in the field but it bugs me ?
Jeff Birt
