Panasonic SA-VKX80GA / SA-VKX80GC / SA-VKX80GS Service Manual ▷ View online
37
7.2.3.
D-Amp P.C.B.
Fig. 3 D-Amp P.C.B.
Audio Digital
Amp IC: IC5400
Audio Digital
Amp IC: IC5000
Audio Digital
Amp IC: IC5200
38
7.3.
D-Amp IC Operation & Control
D-AMP IC Operation & Control
1)
D-AMP IC (C1AB0000497) was used for this model.
2)
Three control pins (signal send from micro-processor IC) were used to control the D-AMP IC
operation such as muting, standby and normal operation. They are described as below: -
operation such as muting, standby and normal operation. They are described as below: -
No Pin no
Signal name
Function
1 4
F_HOP
Frequency
Hop
control.
2
6
MODE_DA
Digital Amp On/Off control.
3
3
MUTE_F
Digital Amp Muting control
Table 1: Digital AMP Pin Control.
Here is detailed description of the three control pins for the D-AMP IC
A) MODE_DA & MUTE_F were used to switch the D-AMP IC in the following muting status:
x
L(Low/OFF): Standby / OFF
x
H (High/ON): Operating or Mute
Below 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 status
1 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 following
event: Switching of Frequency Hoping, power off and start up (when the unit is undergoing
the transition from standby to normal operation mode)
event: Switching of Frequency Hoping, power off and start up (when the unit is undergoing
the transition from standby to normal operation mode)
B) F_HOP is used to control the D-AMP operation to avoid interference with AM source by
controlling the frequency source used. It will switch from one frequency to the other, depending on
the tuned AM frequency.
controlling the frequency source used. It will switch from one frequency to the other, depending on
the tuned AM frequency.
For 9 KHz Step
AM Band Frequency F_HOP Switching Frequency
522 ~ 558
L
301
567 ~ 639
H
350
648 ~ 855
L
301
864 ~ 945
H
350
954 ~ 1152
L
301
1161 ~ 1242
H
350
1251 ~ 1449
L
301
1458 ~ 1539
H
350
1548 ~ 1629
L
301
Table 3: F_HOP Control during 9 kHz Step
For 10 KHz Step
AM Band Frequency F_HOP Switching Frequency
520 ~ 560
L
301
570 ~640
H
350
650 ~ 860
L
301
870 ~ 950
H
350
960 ~ 1160
L
301
39
1170 ~ 1250
H
350
1260 ~ 1450
L
301
1460 ~ 1540
H
350
1550 ~ 1710
L
301
Table 4: F_HOP Control during 10 kHz Step
Note: During activating, the 3 control pins namely MUTE_F, MUTE_A and MODE_DA must
be used to cover the “Pop” sound cause by F-HOP switching.
be used to cover the “Pop” sound cause by F-HOP switching.
40
8 Service Fixture & Tools
8.1.
Service Tools and Equipment
Prepare service tools before process service position.
Service Tools
Remarks
Main P.C.B. (ZJ2701) - SMPS P.C.B. (CN5802)
REXX1158 (11P Cable Wire)
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