No Transmitter
Power
Is TP0710
>1 VDC?
Is TP0705
= 9.3 VDC?
Check DC voltage on
Q3001 pin 2, R3019,
D3000, R3015 in 9V3_PA
Regulator in Controller
Troubleshooting Flowchart.
Replace any component
that does not have 9.3 VDC
across it.
Is D0875 -A
~0.8 VDC?
Replace D0875. Also check if
D0877-A is ~1.6 VDC (to
GND). Replace D0877 if
necessary.
Check 9.3V Regulator in
Power Management
Are TP0706 and
TP0707~2.2
VDC?
Check RD70 bias circuitry
components (R0738, R0740, R0742,
R0744, R0737, C0753, C0754, R0741,
R0743, C0761, C0764 and R0746) for
shorts, opens or bad solder joints.
Replace components as needed.
Is power at
TP0704
~12 dBm?
Is power at
TP0703
~ -4 dBm?
Replace Q0703
Check VCO
Troubleshooting
Flowchart
Is power at
TP0702 (~15 dB)
>TP0700?
Is power at
TP0705 (~10 dB)
>TP0702?
Is power at
D0877 -A (~10 dB)
>TP0705?
Verify that Q0700 Vgs
(TP0700) is ~2.4 VDC and
Vds (TP0702) ~9.3 VDC.
Replace Q0700 if necessary.
Verify that Q0704 Vgs (at
R0719) is ~2.2 VDC and Vds
(TP0705) ~9.3 VDC. Replace
Q0704 if necessary.
Verify that voltage on C0758
and C0759 is ~13.2 VDC.
Replace Q0705 if necessary.
Measure relative power thru remainder of T/R
switch and LPF to find open circuit. Perform visual
inspection of circuit.
Is U3002 Pin 1
= 9.1 VDC?
Is U3002 Pin 5
= 5 VDC?
Replace U3002
Is voltage at
Tx_DAC input
(U0904 Pin 1)
>3 VDC?
Check RFIC
Is voltage at
U0902 Pin 3
>1.5 VDC?
Replace U0904
and U0905
Replace U0901
Yes
No Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Yes
No
No
No
Yes
No
No
No
No
Yes
Yes
Yes
Yes
Is R0739~3-4
VDC?
No
Check RFIC
Yes
Is voltage at
TP0900
> 1 VDC?
Replace U0902
No
Yes
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