FT-101ZD Rectifier B Board Orange Material Around Base of Radial-Lead Capacitors
|
There is an orange material filling the edge-space between the Rectifier B Board and the end of some cylindrical electrolytic capacitors. This occurs only on capacitors along the outside of the mounted-capacitor array, upward and sideward (front-back), of several electrolytic capacitors on the vertically mounted board. ?It looks to me like this orange material is meant to be there, as if it is perhaps a dielectric to prevent breakdown to anything grounded that gets close enough and to keep dust out of these crevices, as these capacitors are used in circuits that produce bias voltages. ?I’ve seen this material on more than one FT-101Z.
?
Looking in the Survival Guide and Yaesu - Musen Maintenance Manual, I see no mention of what this material is. ?Does anyone know with certainty what this material is doing there, or how it got there?
?
Thank you.
73,
Michael Smith, N4KZO |
开云体育I recapped that board and is dry adhesive. I just scraped it off and installed new capacitors.I’m not worried about any vibration that might fatigue the leads of the caps. Fernando N2FQ/6
|
|
It is adhesive used to keep the caps in place, usually during machine soldering. It starts out yellow but as it ages it becomes brown. It also can become conductive and corrosive. Best to remove it before it creates problems.
On Thu, 3 Oct 2024 13:06:26 -0700 "Fernando Quinones N2FQ via groups.io" <n2fq@...> wrote: I recapped that board and is dry adhesive. I just scraped it off and installed new capacitors.-- 73 -Jim NU0C |
Fernando Quinones N2FQ
Jim Shorney