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Checking Regulator
U702
C735
VBAT
C733
RF2.85V
RADIO_POWER
Pin 3. High ?
Yes
RF 2.85V OK?
Yes
No
No
Changing the Board
Regulator Circuit is OK
See next Page to check
VCTCXO
Replace U702
Check Pin 1
Of U405.
Check Pin5
Of U404.
(1608)
(2125)
RF2.85V
22u
C733
C707
VBAT
470p
10p
C709
MIC5219-2.85YM5
4
BYP
EN
3
GND
2
1
IN
5
OUT
U702
C735
4.7u
RADIO_POWER
Regulator Schematic
Z3X-BOX.COM
Summary of Contents for CE500
Page 3: ... 4 Z 3 X B O X C O M ...
Page 77: ...4 TROUBLE SHOOTING 78 5 Check Tx I Q TXQP TXQN TXIN TXIP U704 Test Point Z 3 X B O X C O M ...
Page 85: ...Note 86 Z 3 X B O X C O M ...
Page 93: ... 94 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 94: ... 95 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 95: ... 96 Z 3 X B O X C O M ...
Page 103: ...9 CALIBRATION 104 L Standalone Test Equipment Setup Oscilloscope Z 3 X B O X C O M ...
Page 105: ... 106 Z 3 X B O X C O M ...
Page 127: ...Note 128 Z 3 X B O X C O M ...