Circuit Flow
Input Level is Appear?
YES
NO
Vref 2.7~2.85V
OK?
NO
PAM Circuit is OK
See next page to check
Duplexer & Mobile SW
Check U102 Pin2
RF_IN
YES
Check U102 Pin4
V_REG
NO
Level is
OK?
YES
Check U102 Pin3
DCN:Vcont (0.7v~2.1v)
Check F100
Check Q100, U400
NO
Level is
3.4V~4.2V OK?
YES
Check U102 Pin1, 8
VCC1,2
Check U201
Replace U101
NO
Output Level
is Appear?
YES
Check U102 Pin7
RF_OUT
Replace U102
Waveform
U102 Pin2 DCN PAM_IN
U102 Pin7 DCN PAM_OUT
SPECTRUM ANALYZER CONDITION
-
RBW : 1MHz,VBW: 1KHz
-
Span : 60MHz
-
Frequency : DCN( 836.52MHz)
Z3X-BOX.COM
Содержание ID2750
Страница 2: ...CDMA MOBILE SUBSCRIBER UNIT LG ID2750 SINGLE BAND CDMA MOBILE PHONE SERVICE MANUAL Z 3 X B O X C O M ...
Страница 33: ...DCN Mode Graph 4 2 1763 04MHz DCN384 Z 3 X B O X C O M ...
Страница 37: ...Waveform DP101 Pin 7 Graph 4 3 c DP101 Pin2 Graph 4 4 c Z 3 X B O X C O M ...
Страница 48: ...Circuit Diagram Z 3 X B O X C O M ...
Страница 49: ...Figure 4 3 1 PMIC PM6610 FUNCTIONAL BLOCK DIAGRAM 4 3 Logic Part Trouble Z 3 X B O X C O M ...
Страница 68: ...4 3 11 When UIM isn t operating Test Point Circuit Diagram CON402 No 1 Q407 No 1 Z 3 X B O X C O M ...
Страница 69: ...Checking Flow Z 3 X B O X C O M ...