Recently I got an ICOM IC-R71A receiver from my friend. ICOM IC-R71A is a multi-mode quadruple superheterodyne receiver with the frequency range from 100kHz to 30MHz. When it comes to my workshop it's completely dead but outer casing and front panels are in really good condition. Before troubleshooting the receiver, I download both user manual and service manual from the internet. As like all ICOM products this receiver also comes with very detailed user manual and service manual. Restored ICOM IC-R71A receiver As I observed this receiver consist of many PCBs which including: Mainboard Front boards (altogether 7 boards, which including 1 mainboard known and matrix board and 6 small PCBs) PLL board RF board Logic board and RAM board Power supply board In addition to above boards, there are some previsions in this chassis to install other optional boards such as FM board. After observing the power supply board, I notice a couple of dry joints in the rectifi...
This blog contains electronic, amateur radio, and embedded system projects, which I did during my free time. Unless otherwise noted, all the articles and projects described on this blog are based on my original designs.