Read Panasonic KX-TCA285RU Service Manual online
15
KX-TCA285RU
4.2.14.
RX Audio Path
Receiver
Burst data is input from RF cricuit to IC1.
In IC1, the burst data is converted to ADPCM, then to analog signal, and sent from pin 21 (HSSPOUTP) and pin 22 (LOUT) to
the receiver via headset jack (CN301) .
In IC1, the burst data is converted to ADPCM, then to analog signal, and sent from pin 21 (HSSPOUTP) and pin 22 (LOUT) to
the receiver via headset jack (CN301) .
Headset
When the headset is inserted, a signal to the receiver is cut off and audio signal from pin 22 (LOUT) of IC1 is input to the head-
set.
set.
Speakerphone
In Speakerphone mode, an audio signal from pin 18 (SPOUTP) and 20(SPOUTN) of IC1 is sent to a monitor speaker.
CHG_CUR
COUNT
GND
C302
C301
C307
NC
GNDA
GND
GNDA
C10
C12
C11
NC
GND
BATTERY
VBAT_MON
GNDA
C306
NC
VBG
GND
C305
L2
DC
C4
NC
VCCA
C23
R7
R300
R6
C6
C14
C19
C5
C15
R8
R9
DOUT3.0V
RA300
1
23
4
R3
C9
C2
C21
L22
L1
C13
IC1
1
DOUBCAPP2
2
DOUBCAPN1
18
SPOUTP
3
DOUBCAPP1
4
DOUT3V0
5
DOUT4V5
6
DOUT2V5/DCIN0/LIN0
7
LEDSINK2/DCIN1
8
DCIN2
19
VCCPA
20
SPOUTN
21
HSSPOUTP
22
LOUT
23
PWM0
24
DCINS
25
XOUT
38
TEST
39
RX_SW
40
LNA_INN
69
GND
9
DCIN3/LIN1
10
LEDSINK1/PWM1
11
VREF
12
VCCA
13
MIN
14
MIP
15
HSMIN
16
HSMIP
26
XIN
27
VDD_APU
28
VBAT_APU
29
VDD_IF
30
VCC_FE_IF
31
VCC_PA
32
BAL_OUT2
33
BAL_OUT1
41
LNA_INP
42
ATST_N
43
ATST_P/EXT_LNA
44
RSTN
45
VCC_VCO
46
ON_OFF
47
ON_OFF_OUT
48
IF_T_DATA
49
IF_MLSE
50
IF_RX1
51
IF_NPORST
53
IF_INT_ANA
54
IF_EN_DA
55
IF_EN_AD
56
IF_DATA_DA
57
IF_DATA_AD
58
IF_CLK_PLL
59
IF_CLK_IF
60
IF_CDC_DIR
61
IF_CDC_DAT_DA
62
IF_CDC_DAT_AD
63
IF_BAT_OK
64
VDD_ADIF
65
VDDCORE
66
COREOUT
67
VBAT
68
DOUBCAPN2
36
GND_RF
37
ANT2
17
MPWR
34
TX_SW
35
ANT1
52
IF_NARES
C40
CHG_DET
VIB_CTRL
VIB_CTRL
C326
NC
C313
D301
NC
D300
NC
GND
C328
GND GND
GND GND
C327
NC
C314
NC
SP-PHONE_SPEAKER
+
-
C321
L302
C316
C320
C322
L303
L300
C16
NC
GND
GND
VBAT_3.0V
VBAT_3.0V
GNDA
GNDA
GNDA
GNDA1 GNDA1 GNDA1
GNDA1
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
SPP
SPM
MIC+
MIC-
GNDA
GND
GND
GND
GND
GND
L305
L304
L301
C325
GNDA
VCCA
HEADSET_DET
VCCA
C17
NC
R14
R301
R305
R304
R302
R303
R317
R314
D304
D305
D302
D303
R308
R309
C315
C18
CN301
1
4
2
3
3
5
C311
NC
REV-
REV+
C312
NC
RA301
1
2
3
4
4
R306
C310
C319
NC
C318
NC
ZA2
1
4
ZA3
1
2
2
3
2
3
4
C331
R316
R320
NC
X1
13.824M
1
2
4
3
MIC
AP1
1
2
2
C54
L21
R321
C324
C323
C317
MIC POWER
RECEIVER+
RECEIVER-
HEADSET_DET
Headset_MIC+
Speakerphone_SP+
Speakerphone_SP-
MIC+
MIC-
Headset_RECEIVER
Receiver
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