Panasonic SA-AKX32LM-K Service Manual

Also see for SB-AKX32: Service manual

Contents

277.3. D-Amp IC Operation & ControlD-AMP IC Operation & Control1) D-AMP IC (C1AB00000497) was used for this model.2) Three control pins (signal send from micro-processor IC) were used to control the D-AMP ICoperation such as muting, standby and normal operation. They are described as below: -No Pin no Signal name Function1 4 F_HOP Frequency Hop control.2 6 MODE_DA Digital Amp On/Off control.3 3 MUTE_F Digital Amp Muting controlTable 1: Digital AMP Pin Control.Here is detailed description of the three control pins for the D-AMP ICA) MODE_DA & MUTE_F were used to switch the D-AMP IC in the following muting status:x L(Low/OFF): Standby / OFFx H (High/ON): Operating or MuteBelow is the logic for the two pins used for the control of the D-AMP IC.No MODE_DA MUTE_F Digital AMP IC mode status1 L X OFF (0V)2 H H Mute (2.5V)3 H L Operating(5V)Table 2: Digital AMP IC Mode Status.Note: Standby/OFF condition of D.AMP IC is available / activated only during the followingevent: Switching of Frequency Hoping, power off and start up (when the unit is undergoingthe transition from standby to normal operation mode)B) F_HOP is used to control the D-AMP operation to avoid interference with AM source bycontrolling the frequency source used. It will switch from one frequency to the other, depending onthe tuned AM frequency.For 9 KHz StepAM Band Frequency F_HOP Switching Frequency522 ~ 558 L 301567 ~ 639 H 350648 ~ 855 L 301864 ~ 945 H 350954 ~ 1152 L 3011161 ~ 1242 H 3501251 ~ 1449 L 3011458 ~ 1539 H 3501548 ~ 1629 L 301Table 3: F_HOP Control during 9 kHz StepFor 10 KHz StepAM Band Frequency F_HOP Switching Frequency520 ~ 560 L 301570 ~640 H 350650 ~ 860 L 301870 ~ 950 H 350960 ~ 1160 L 301