4. TROUBLE SHOOTING
- 95 -
START
Does the audio
profile of the phone
change to the
earphone mode?
NO
YES
YES
Earphone will work properly
Level at
JACK_DETECT signal
is low
NO
Can you hear your
voice from
the earphone?
Set the audio part of the test
Equipment to echo mode
Change the earphone
and try again
NO
Can you hear your
voice from
the earphone?
YES
Can you hear
the sound from
the earphone?
No
Set the audio part of
the test equipment to
PRBS or continuous
wave mode
YES
Voltage level check
Of AUX_SPK_L
& AUX_SPK_R
signal.
Replace J200
YES
NO
Voltage level check
Of AUX_MIC_P &
AUX_MIC_N
signal.
YES
Resoler components
No
No
Change main board
YES
YES
Checking Flow
Z3X-BOX.COM
Summary of Contents for MG300d
Page 23: ...3 TECHNICAL BRIEF 24 Figure 3 1 SKY74400 FUNCTIONAL BLOCK DIAGRAM Z 3 X B O X C O M ...
Page 83: ...4 TROUBLE SHOOTING 84 4 6 LCD Trouble EMI FILTER CN600 Test Points Z 3 X B O X C O M ...
Page 110: ...5 DOWNLOAD AND CALIBRATION 111 8 Push the START button Z 3 X B O X C O M ...
Page 111: ...5 DOWNLOAD AND CALIBRATION 112 9 Phone test Finish is shown in below screen Z 3 X B O X C O M ...
Page 112: ...6 BLOCK DIAGRAM 113 6 BLOCK DIAGRAM Z 3 X B O X C O M ...
Page 113: ... 114 Z 3 X B O X C O M ...
Page 124: ... 125 MG300d 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 125: ... 126 MG300d 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 137: ... 138 Z 3 X B O X C O M ...
Page 138: ... 139 Z 3 X B O X C O M ...
Page 140: ... 141 12 EXPLODED VIEW REPLACEMENT PART LIST Z 3 X B O X C O M ...
Page 141: ... 142 Z 3 X B O X C O M ...