Help un-modding a Royce 639 cb.

[jhutch62]

Hello,
I'm trying to undo someone's sloppy mods and restore a Royce 1-639 (639) to factory specs. The problem is that the schematic that's available online is of poor quality, meaning that some of the letters and numbers are not legible. I tried looking at SAMS PHOTOFACT, but seems that they have no info on this radio, plus, I really didn't want spend $22.00 bucks on a radio that may be shot.

Anyway, when I first tested the radio, it seemed to work fine on AM and USB, with good RX and modulation on TX, but when I switched to LSB, the volume of white noise (hash) got louder and there was only dead key, with no modulation. I initially thought that it would be an easy fix, thinking that it was a faulty 10.XXXXMHz crystal, but when looked inside, there were un-insulated wires, cut wires and solider blobs rolling around inside. I've taken some pics of the PCB, in the hope that someone that is familiar with this radio, could tell me where they go or at least post some good pics to give me an idea as to where they go. Any help you could give would be greatly appreciated.

Thanks.

 

[TheSpaceMann]

Hello,
I'm trying to undo someone's sloppy mods and restore a Royce 1-639 (639) to factory specs. The problem is that the schematic that's available online is of poor quality, meaning that some of the letters and numbers are not legible. I tried looking at SAMS PHOTOFACT, but seems that they have no info on this radio, plus, I really didn't want spend $22.00 bucks on a radio that may be shot.

Anyway, when I first tested the radio, it seemed to work fine on AM and USB, with good RX and modulation on TX, but when I switched to LSB, the volume of white noise (hash) got louder and there was only dead key, with no modulation. I initially thought that it would be an easy fix, thinking that it was a faulty 10.XXXXMHz crystal, but when looked inside, there were un-insulated wires, cut wires and solider blobs rolling around inside. I've taken some pics of the PCB, in the hope that someone that is familiar with this radio, could tell me where they go or at least post some good pics to give me an idea as to where they go. Any help you could give would be greatly appreciated.

Thanks.

Have you checked CB Tricks - Home Page for the list of mods for that unit? (Check the Secret CB section)

 

[INFRACTOR]

Royce 639 is the same as Globephone GS-480 DX

Royce 639 is the same as Globephone GS-480 DX or I know that this post is very old I answer so that someone in the future knows what to look for.
Royce 639 is the same as Globephone GS-480 DX or SOMMERKAMP TS- 340 DX