Wcdma Transmitter - Samsung SGH-J750 Service Manual
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Also See for SGH-J750:
- User manual (40 pages) ,
- Quick start manual (7 pages) ,
- User manual (42 pages)
Table of Contents
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Flow Chart of Troubleshooting
9-16. WCDMA Transmitter
TX ON (5Level)
Yes
RFS100 pin19
≥ 23dBm
No
RFS100 pin17
≥ 23dBm
No
DUF302
≥ 23dBm
No
PAM303 pin8
≥ -5dBm
No
F303 pin8
≥ -5dBm
No
Check UCP600
END
Yes
Resolder RFC100,C131,L103
Yes
Yes
Resolder or Change C118
Yes
Yes
Resolder or Change L310, L312
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VDD = H (2.5V),
VC1,VC3 = 1.5V
VC2, = 0
Yes
Yes
Check PAM303
pin2,3,4,5,8 is ok?
No
9-24
No
Check ANT Switch
control circuit
Change or Resolder RFS100
Resolder or Change PAM303
Check VBAT or PAM
control signal
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Table of Contents
