4. TROUBLE SHOOTING
- 79 -
(2) Checking VCTCXO Circuit
X501.3
(OUT)
X501.4
(VCC)
X501
Check Pin 3.
Refer to Graph 4(b)
26 MHzO.K?
No
No
VCTCXO Circuit is OK
See next Page to check
Mobile SW
VCTCXO Circuit is OK
See next Page to check
Mobile SW
Yes
Check Pin 4.
Refer to Graph 4(a)
2.75V OK?
No
Yes
Changing X500
Check U101, PMIC
(AFCDAC)
4
VCONT
1
26MHz
X501
2
GND
3
OUT
VCC
15K
R523
C548
1000p
2V75_VVCXO
C549
2.2u
AFC
Figure 4-6.
Figure 4-7.
Figure 4-8.
TEST POINT
CIRCUIT
CHECKING FLOW
WAVEFORM
Graph 4-1.
Graph 4-2.
Содержание KG920
Страница 3: ... 4 ...
Страница 48: ...3 TECHNICAL BRIEF 49 3 8 2 AFE Analog Front End Figure 3 22 ...
Страница 52: ...3 TECHNICAL BRIEF 53 3 8 5 MBGM01 5M CCD ISP Figure 3 25 ...
Страница 55: ...3 TECHNICAL BRIEF 56 3 8 6 MV8620 5M back end IC Multi Media Function Figure 3 26 ...
Страница 58: ...3 TECHNICAL BRIEF 59 3 9 MIDI IC YMU787 Figure 3 27 YMU787 BLOCKDIAGRAM ...
Страница 87: ...4 TROUBLE SHOOTING 88 Graph 4 8 BLUE RST Graph 4 9 DEBUG_TX RX Graph 4 10 PCM_SYNCS TX RX USC0 ...
Страница 96: ...4 TROUBLE SHOOTING 97 4 7 KEY backlight Trouble TEST POINT Q101 R122 Q101 LD101 LD119 Figure 4 38 Figure 4 39 ...
Страница 108: ...4 TROUBLE SHOOTING 109 CIRCUIT WAVEFORM Figure 4 59 Graph 4 11 Figure 4 60 Figure ...
Страница 109: ...4 TROUBLE SHOOTING 110 TEST POINT U602 FB602 U100 Q100 Q101 C113 C114 Figure 4 61 Figure 4 62 ...
Страница 111: ...Figure 4 65 Graph 4 12 4 TROUBLE SHOOTING 112 C102 C113 U101 Figure 4 66 C137 U103 TEST POINT WAVEFORM ...
Страница 112: ...4 TROUBLE SHOOTING 113 Figure 4 67 Figure 4 68 CIRCUIT ...
Страница 115: ...4 TROUBLE SHOOTING 116 WAVEFORM Graph 4 13 ...
Страница 139: ...6 BLOCK DIAGRAM 140 6 BLOCK DIAGRAM Figure 6 1 ...
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