Reception Signal; Transmission Signal - Sharp GX10i Service Manual

GX10i
KEY PWB-B(2/2)
A
5-26 (6-B)
VRF
5-27 (12-E) BS2
B
5-27 (12-E) BS0
5-27 (12-E)
BS1
5-25 (10-G)
VBAT_R
5-26 (6-B)
VTXVCO
C
5-27 (9-F)
RAMPDAC
D
ITXN
ITXP
QTXN
QTXP
5-25 (8-G,H)
E
QRXN
QRXP
IRXP
IRXN
5-24 (6-H) VTCXO
5-24 (6-H)
VSYNTH
5-27 (12-F)
SYNTHEN
F
5-25 (12-G)
TCXOOUT
5-27 (12-E)
SYNTHCLK
5-27 (9-F)
AFCDAC
G
5-27 (12-E) SYNTHDATA
H
• NOTES ON SCHEMATIC DIAGRAM can be found on page 5-1.
1
CONFIDENTIAL

RECEPTION SIGNAL

G VRF
G
G
G
G
G
C889
2.2
G
R887
100K
G
G
G
G
G
G
G
G
G
G
G
L951
FERRITE BEADS
G
G
R953
10
Vcc
4
OUTPUT
C954
Vcont
1
0.1 GND
TCX951
26MHz
G
TCXO
C955
0.1
G
IC971
VCO971
Pin 3
RF VCO
~24CH LOW
GSM
25CH~50CH N/A
51CH~ HIGH
DCS LOW
PCS HIGH
2 3
Figure 23 SCHEMATIC DIAGRAM (21/23)

TRANSMISSION SIGNAL

BS
BS0 BS1 BS2
Tx LOW N/A HIGH
GSM
Rx LOW N/A LOW
Tx HIGH LOW HIGH
DCS
Rx HIGH LOW LOW
Tx HIGH HIGH HIGH
PCS
Rx HIGH HIGH LOW
VTXVCO
R923
0
1
2
3
4
R944
4.7K
C944 C945
0.0018 270P
(CH)
C952
100P(CH)
3
C946
2
0.01
C975
150P
R973 R972
(CH) 3.3K
1.5K
R974
4.7K
C971
0.1
3 2 1
4 8
5 6 7
4
5 – 28
17 20
,
15 18
,
16 19
,
7 9
8
7
6
5
8
13 12
10
14
11
6
IC901
HD155148TF
4
RF
5
6 5 4
FL971
BALUM
1 2 3
C979
3P(CH)
5
R886
10K
C
2
R871
47
R872
33
L861
FER
BEA
C901
0.01
L
2
C905
0.01
6