4. TROUBLE SHOOTING
- 83 -
START
Does the audio
profile of the phone
change to the
earphone mode?
NO
YES
Resolder J200
YES
Earphone will work properly
Change earphone
Level at pin1
of U201 is high
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
Download software.
YES
Does it work well?
Change the main board.
YES
NO
Voltage at
C209
=1.2V ?
Check soldering
C209
R210
YES
Change the main board.
YES
Download software
Resolder component
Replace U201
YES
Checking Flow
Summary of Contents for C3380
Page 1: ...Service Manual Model C3380 Date November 2005 Issue 1 0 Service Manual C3380 ...
Page 3: ... 4 ...
Page 83: ...4 TROUBLE SHOOTING 84 4 11 KEY backlight Trouble Test Points Figure 4 22 ...
Page 109: ...Note 110 ...
Page 116: ... 117 8 PCB LAYOUT ...
Page 117: ... 118 8 PCB LAYOUT ...
Page 125: ...10 STAND ALONE TEST 126 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 129: ... 130 ...
Page 131: ... 132 ...