Motorola 38C V100 Service Manual page 37

Level 3 Service Manual
GSM_SEL and DCS_SEL
(from Magic IC)
signals are present on Q110
Pin 3 and Pin 1?
RX_EN (from Whitecap
IC) signal is present on
Q112 Pin 4?
RF_V2 signal is present
on Q112 Pin 3?
RX275 signal is present
on Q112 Pin 2?
RX275_GSM and RX275_DCS
signals are present on Q110
Pin 4 and Pin 6?
RX275_GSM_PCS signal is
present on Q2101 Pin 2?
RX275_DPCS signal is
present on Q2102 Pin 2?
RX CONTROL MATRIX functioning properly
Figure 17. No Receiver Control Matrix
6881036B20
P
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
END
MOTOROLA CONFIDENTIAL - PROPRIETARY
Check U200
See Note 1
Check U800
See Note 1
VREF signal from U900
present on C213?
See Note 1
Check Q112
See Note 1
GSM_SEL and DCS_SEL
signals are present on
Q110 Pin 1 and Pin 3?
See Note 1
Check Q2101
See Note 1
Check Q2102
See Note 1
November 20, 2000
Troubleshooting
In most cases, a reference board can be
used to compare signals.
Check U900
NO
See Note 1
Check Q202 and U200
YES
See Note 1
Check U800
NO
See Note 1
Check Q110
YES See Note 1
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
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