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4. Trouble Shooting
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4.19.9 Checking Transceiver Output Signals
Figure 20. Transceiver Output Circuit
Checking Points
36
TX1
TX2
37
34
VBIAS
VDDBIAS
VDDMIX2V8
39
VDDTX1V5
35
38
VDDTX2V8
FE2
33
40
GND3
GND4
41
A
1
2
AX
3
NA
0.1u
C534
C525
C526
5600p
10p
C527
R514 10
0
R509
C532
NA
C535
NA
C524
47n
C531
VSUPPLY
NA
1K
R505
GND6
18
GND7
19
GND8
20
GND9
GSM_IN
7
MODE
1
4
RSVD1
VBATT
5
VRAMP
6
25
GND15
26
17
0
3
BS
S_PCS_IN
2
EN
8
21
GND10
22
GND11
23
GND12
24
GND13
GND14
R507
0
Figure 21. Transceiver Output
Table 3. Transceiver Output Operation
U601
GSM IN (R507)
DCS_PCS IN (R509)
MODE
Transceiver Output
GSMK
VRAMP controls output power
8PSK
VRVBIAS sets PA bias
Summary of Contents for Chocolate KE800
Page 1: ...Service Manual Model KE800 Service Manual KE800 Date January 2007 Issue 1 0 ...
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Page 82: ...6 SW Download 83 KE800 KE800P40 7 V10g 9 Download complete ...
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