Hey guys, I'm having an issue with adjusting my C800G's power supply within spec after changing the tube. According to the service manual on page 9 (attached) the value across resistor R111 is supposed to read at 1.150 V dc after about 40 mins . And if it is above that you are supposed to use the trim pot on RV101 to reduce the value until it is at 1.150 volts.
The problem is that with the trim pot wide open I am getting a reading around 4.3v, and after adjusting the trim to the lowest setting the lowest value I can get across R111 is 2.3 v. This is twice the value that is within spec.
Does anyone have any idea what might be going on, or how I might go about fixing this issue? Is there something wrong with the peltier element?
Also, how would an issue like this affect the sound of the mic? Since apparently I've been running it like this for a while.
Thanks.
The problem is that with the trim pot wide open I am getting a reading around 4.3v, and after adjusting the trim to the lowest setting the lowest value I can get across R111 is 2.3 v. This is twice the value that is within spec.
Does anyone have any idea what might be going on, or how I might go about fixing this issue? Is there something wrong with the peltier element?
Also, how would an issue like this affect the sound of the mic? Since apparently I've been running it like this for a while.
Thanks.