12-06-2014, 09:03 PM
The RCM-3 master control unit was taken to my workbench and laid face down on an old towel, to protect the front panel.
[Image: http://www.philcoradio.com/images/phorum...e00005.jpg]
This would be a very tricky operation - because I have no schematic.
That's right, the old "operate by the seat of your pants" technique. One wrong move on my part and I would have a static display.
Carefully, I began to disassemble the unit. Soon, it looked like this:
[Image: http://www.philcoradio.com/images/phorum...e00006.jpg]
My mission was to replace all electrolytic capacitors.
[Image: http://www.philcoradio.com/images/phorum...e00007.jpg]
Here is a close-up of the circuit board that contains the AM tuner (save for the actual tuning condenser which is on the FM tuner board), and the audio amplifier circuitry. This board has mostly GE transistors although I saw one Texas Instruments transistor - perhaps this one was a replacement?
I noticed something very interesting while looking over the FM tuner board:
[Image: http://www.philcoradio.com/images/phorum...e00008.jpg]
Yes, Philco transistors! I was not expecting to see these.
From here on, I had to work very carefully. I would replace one electrolytic at a time, making double sure that the replacement went in with the same polarity as the original.
[Image: http://www.philcoradio.com/images/phorum...e00005.jpg]
This would be a very tricky operation - because I have no schematic.
That's right, the old "operate by the seat of your pants" technique. One wrong move on my part and I would have a static display.Carefully, I began to disassemble the unit. Soon, it looked like this:
[Image: http://www.philcoradio.com/images/phorum...e00006.jpg]
My mission was to replace all electrolytic capacitors.
[Image: http://www.philcoradio.com/images/phorum...e00007.jpg]
Here is a close-up of the circuit board that contains the AM tuner (save for the actual tuning condenser which is on the FM tuner board), and the audio amplifier circuitry. This board has mostly GE transistors although I saw one Texas Instruments transistor - perhaps this one was a replacement?
I noticed something very interesting while looking over the FM tuner board:
[Image: http://www.philcoradio.com/images/phorum...e00008.jpg]
Yes, Philco transistors! I was not expecting to see these.
From here on, I had to work very carefully. I would replace one electrolytic at a time, making double sure that the replacement went in with the same polarity as the original.
--
Ron Ramirez
Ferdinand IN
