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Flow Chart of Troubleshooting
9-26
9-17. DCS, PCS Transmitter
U103 PIN11
≥
25dBm
TX ON (0Level)
Check PAM100
PIN8 = H (2.6V),
PIN9 = H
PAM100 pin2
≥
25dBm
Resolder PAM100
Check ANT Switch
control circuit
Yes
No
Yes
Yes
Yes
Yes
Yes
No
No
END
Check U200
Resolder U103
Yes
Resolder L103, C169, C173
U103 pin 27,28,29,30
≥
0.2Vp_p
U103 pin 4,6,7,12,26,
32,34
≥
2.8V
pin 10
≥
1.8V
No
Check & Resolder
C127,C128,C138