Labels:bulletin board | reckoner | sky OCR: KENWOOD ASB-1037 Service Bulletin Amateur Radio Division Subject: TH-28/48A/E CTCSS Tone Error Date: March 8 1994 Symptom Several reports were received on early model TH-28/48's concerning an inability to access sub- audible tone controlled repeaters This symptom only occured when the repeater required the use of any of the following tones 131 136.5 173.8 Hz Corrective Action: microprocessor software error responsible for this symptom. Replacing microprocessor IC6 on board X53 -3400 (TH-28 or X53-3410 TH-48 with the part listed below will correct this symptom Parts Required: ott Description Old Part No. New Part No. Circult Description Microprocessor HD404629A73H HD404629A79H IC6 Caution: This modification requires soldering equipment rated for CMOS type circuits i also requires famillarit ...
.iso/mods/kenwood/servbull/asb1037.jpg){kind=small}
.iso/mods/kenwood/servbull/asb1036.jpg){kind=link}
.iso/mods/kenwood/servbull/asb1038.jpg){kind=link}