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(1) Checking Crystal Circuit
TEST POINT
CIRCUIT
AD6548
U501
25
RX1900B
26
RX1900
27
RX1800B
28
RX1800
29
RX900B
30
RX900
31
RX850B
32
RX850
33
GND
WAVEFORM
Graph 4.2.1(a)
R509
X500
QP
C515
39p
QN
C520
0.1u
16
VLDO2
15
VLDO1
14
VBAT
13
VDD
12
VCC_TXVCO
11
TXOP_HI
10
TXOP_LO
9
VLDO3
- 41 -
4. TROUBLE SHOOTING
CHECKING FLOW
Yes
26 MHzO.K?
No
No
Change X500
R513
C514
47p
NA
C519
1000p
R514
1K
C521
C522
C523
C524
0.1u
C525
27p
39p
0.1u
27p
C527
220n
C533
C534
27p
0.1u
C536
0.1u
Graph 4.2.1(b)
Crystal Circuit is OK
See next Page to check
See next Page to check
Mobile SW
Mobile SW
R509
26M_DBB
0
AFC
R515
0
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