LG KG200 Service Manual - Page 46

DCS PCS RF output

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4. Troubleshooting PA module (U600) Test point part Function U600, pin1 DPCS_IN U600, pin2 BS U600, pin3 TXEN U600, pin4 VBAT U600, pin5 CEXT U600, pin6 VRAMP U600, pin7 EGSM_IN U600, pin10 EGSM_OUT U600, pin16 DPCS_OUT Typical value Description DCS PCS RF input 2.8V Band select logic input 2.8V TX enable logic input 3.8V(3.4~4.2V) Battery supply connection by pass Analog signal used to control the output power EGSM RF input EGSM RF output DCS PCS RF output - 47 -

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4. Troubleshooting
- 47 -
P
A module (U600)
Test point part
Function
Typical value
Description
U600, pin1
DPCS_IN
DCS PCS RF input
U600, pin2
BS
2.8V
Band select logic input
U600, pin3
TXEN
2.8V
TX enable logic input
U600, pin4
VBAT
3.8V(3.4~4.2V)
Battery supply connection
U600, pin5
CEXT
by pass
U600, pin6
VRAMP
Analog signal used to control the output power
U600, pin7
EGSM_IN
EGSM RF input
U600, pin10
EGSM_OUT
EGSM RF output
U600, pin16
DPCS_OUT
DCS PCS RF output