Nad C 420 Service Information
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Page 1
PAGE 1-01-01 Service Tip C420 Preset memory circuit change PROBLEM: When a frequency of 102.5MHz or higher is stored into preset 3 the unit may change this frequency to 12.8MHz less after receiving any remote command (102.5MHz becomes 89.2MHz). This occurs even with other brands remote commands. CAUSE: This is a software bug. SOLUTION: The solution is to replace the CPU, this will keep the part number mentioned in the service manual: LC866448B (201). PRODUCTION: This modification has been implemented in production from serial number: G0XC42003201 Contact: NAD Electronics International 633 Granite Court Pickering, ON Canada L1K 3K1 Voice: 905-831-0799 FAX 905-837-6357 NAD@www.NADelectronics.com