Labels:book | monitor | reckoner | sky OCR: KENWOOD SB-972 SERVICE BULLETIN AMATEUR RADIO SUBJECT DATE TM-631A/731A MEMORY LOSS MODIFICATION 08 08/90 Some TM- -631A/731A owners have reported that the transce iver intermi ittently loses its memory channel informati ion when the power is turned on The fol low ing modifi cat ion will absorb pulses the CPU interrupt line INT4 and reconf gure the backup switching circuit to avoid unintent ional memory 1055 Read ins tructions be: fore proceeding Do not attempt this modi fication beyond you capability REQUIRED PARTS ZKIT-731MEMO The kit conta ins: PART DESCRIPTION QTY NJM78LO6A 6V AVR 1SS1 133 DIODE MTZ3 OJB OV ZENER DIODE CEO 1NW0J221M 220uF 3V ELECTROLYTIC CAPACITOR C91-0457 -05 022uF CERAMIC CAPACITOR CK4 581H103K n olUf CERAMIC CAPACITOR RD1 4BB2C103J 10K OHM 1/6W RESI ISTOR RD14BB2C10 ...
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