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4.19.6 Checking RX I/Q Signals
4. Trouble Shooting
- 70 -
Checking Flow
Checking Points
Figure 13. RX I/Q Circuit
VDDVCO2V8
17
VDDXO2V8
15
XO
11
12
XOX
8
VDDDIG1V5
VDDDIG2V8
5
DMIX2V8
DTX2V8
6
DA
16
EN
14
FSYS1
10
FSYS2
FSYS3
9
GND1
13
D3
D4
A
1
2
AX
B
3
4
BX
CLK
7
C552
NA
620
R508
VCONT
1
26MHz
X501
2
GND
3
OUT
VCC
4
0.1u
C529
820
R502
NA
2V7_VCXO
C536
120p
C530
R510
10
C539
47n
NA
C528
NA
C545
0.1u
C538
1V5_CORE
NA
C544
C537
2V85_RF
NA
1000p
C540
22p
C533
820p
C521
AFC
26MHZ_MCLK
BT_CLK
I
IX
Q
QX
RF_CLK
RF_DA
RF_EN
Figure 14. RX I/Q
I
Q
U501
IX
QX
Figure 15. RX I/Q Waveform
I
Q
I
Q
RX
Check RX I/Q Signals
Signals are
Normal ?
Replace
Transceiver
PMB6272(U501)
Yes
No
RX Part is OK.
Check Base Band Circuit
or
Re-Download S/W and Cal.
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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Page 96: ... 97 8 PCB LAYOUT ...
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