LG KE600 Service Manual - Page 113
Checking PAM Control Signals, PAM Control Signals Circuit, Transceiver,
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5. Trouble shooting 5.15.12 Checking PAM Control Signals GND11 23 GND10 22 GND9 21 GND8 19 GND7 GND6 17 GND5 16 GND4 14 GND3 13 GND2 11 9 GND1 8 NC3 20 15 NC2 10 NC1 12 LB_RFOUT HB_RFOUT 18 RF3158 LB_RFIN 7 VRAMP 6 VMODE 5 VBATT 4 TX_EN 3 BAND_SEL 2 HB_RFIN 1 U601 VSUPPLY C638 3p C639 C620 10p 56p C621 18p C613 68u LBAND_PAM_IN R611 15K HBAND_PAM_IN R612 R613 R614 100K 100K 100K PA_LEVEL MODE TXON_PA PA_BAND Figure 26. PAM Control Signals Circuit Checking Points U601 U60 PA LEVEL(R611) Mode (R612) TXON PA(R613) Figure 27. Transceiver MODE GMSK 8PSK MODE LOW HIGH PA_LEVEL Ramp Burst Control Control Amp bias TXON_PA HIGH HIGH Table 4. PAM Mode Operation - 114 -
5. Trouble shooting
- 114 -
5.15.12 Checking PAM Control Signals
C613
68u
R612
100K
R611
15K
18p
C621
3p
C638
10p
C639
56p
C620
100K
R613
100K
R614
GND9
21
HB_RFIN
1
18
HB_RFOUT
LB_RFIN
7
12
LB_RFOUT
10
NC1
NC2
15
20
NC3
TX_EN
3
4
VBATT
VMODE
5
6
VRAMP
VSUPPLY
2
BAND_SEL
8
GND1
22
GND10
GND11
23
GND2
9
GND3
11
GND4
13
14
GND5
16
GND6
GND7
17
GND8
19
U601
RF3158
PA_BAND
PA_LEVEL
MODE
TXON_PA
HBAND_PAM_IN
LBAND_PAM_IN
Figure 26. PAM Control Signals Circuit
Figure 27. Transceiver
Table 4. PAM Mode Operation
Checking Points
U60
TXON PA(R613)
U601
Mode (R612)
PA LEVEL(R611)
MODE
MODE
PA_LEVEL
TXON_PA
GMSK
LOW
Ramp Burst Control
HIGH
8PSK
HIGH
Control Amp bias
HIGH