FAULT FINDING
PMCE041201C8
Section 8
Provisional Issue
Service Manual
– 1 –
Revision 1
8 FAULT FINDING
8.1. RF Waveforms
Figure 8.1: Front-end Module (U502), receive-path signals
Figure 8.2: Transceiver IC (U500) and Rx band-pass filters (FL502, FL503, and FL504),receive-path signals
NOTE:
The measurements shown below are by FET probe. When using a FET probe, it should be protected by a
10 dB pad. Some of the measurement points are non-50
Ω
, therefore signal levels are approximate. Do not
probe the output of the Power Amplifier or the Front-end Module's transmit path
PATH
VC1
VC2
VC3
Vdd
E-GSM-Rx
Low
High
Low
High
DCS-Rx
Low
Low
Low
High
PCS-Rx
Low
Low
High
High
Front-end Module control logic, receive mode. High = 2.7V; Low = 0V
ASM
-50dBm
-50.5dBm
-50.4dBm
-50.4dBm
VC1
VC2
VC3
2.7V
TRX
-
51.4dBm
-51.5dBm
-51.4dBm
-49.5dBm
-49.4dBm
-49.4dBm
2.7V
2.7V
2.7V
2.7V
Summary of Contents for EB-X700
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Page 107: ...12 6 Mini SD SIM PCB 12 6 PROVISIONAL ISSUE ...
Page 109: ...12 8 LCD PCB 12 8 PROVISIONAL ISSUE ...
Page 110: ...13 LAYOUT DIAGRAMS 13 1 Main PCB Top View 13 1 1 2K PROVISIONAL ISSUE ...
Page 111: ...13 2 Main PCB Bottom View 13 2 1 5K 10K 10K 10K 10K 10K 1 5K PROVISIONAL ISSUE ...
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