4. TROUBLE SHOOTING
- 121 -
Figure 4-81.
CHECKING FLOW
Play MIDI
Check the voltage level
of U200.9 = 2.8V?,
U200.10 = 1.8V?
No
Re-Place
U200
Play MP3
MIDI Trouble
MP3 Trouble
Yes
Check the Signal of
U203.G5 = 26MHz?
No
Re-solder
C209
Yes
Check the Signal,
U203.B5 and U203.A4,
U203.B7, U203.B8.
Yes
No
Re-Place
U203
Check the Level of
U404.C2 = Low ?
No
Re-solder
R429
Check the Signal,
U404.A2 and U404.C2
No
Re-Place
U404
Check the Connection,
CN102(Key)
Yes
No
Re-
Assemble or
Re-place
Speaker
Check the voltage level
of U602.4 = 2.8V?,
No
Re-Place U602
or Re-solder
FB603
Check the solder
condition of R710 ~
R715
No
Re-solder
R710 ~
R715
Yes
Yes
Check the Signal,
U700.11 and U700.12
Yes
No
Re-Place
U700
Check the Level of
U400.A1 = High ?
No
Re-solder
R420
Check the solder
condition of R414, R415,
R417, R418, C410, C411,
C420, C421, L400, L401
No
Re-solder
The
components
Yes
Check the Signal,
U400.A4 and U400.D4
Yes
No
Re-Place
U400
Yes
Check the Level of
U404.C2 = High ?
No
Re-solder
R429
Try again
or Change the Board
Yes
Yes
Check the condition of
Main FPCB.
Replace
Main FPCB
Check the connection
and Solder condition
of CN700 and CN101
Re-solder or
Reassemble
CN700 or CN101
Yes
Yes
No
Yes
No
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 ...
Страница 148: ... 149 8 PCB LAYOUT ...
Страница 149: ... 150 8 PCB LAYOUT ...
Страница 150: ... 151 8 PCB LAYOUT ...
Страница 151: ... 152 8 PCB LAYOUT ...
Страница 152: ... 153 8 PCB LAYOUT ...
Страница 153: ... 154 8 PCB LAYOUT ...
Страница 154: ... 155 8 PCB LAYOUT ...
Страница 155: ... 156 8 PCB LAYOUT ...
Страница 163: ... 164 ...
Страница 194: ...Note ...
Страница 195: ...Note ...