Troubleshooting Charts 5-21
Figure 5-21.Troubleshooting Flow Chart for VCO 8/900 MHz (Sheet 2 of 2)
No
Yes
Yes
No
No
Yes
Yes
No
No
Yes
No
Yes
START
VCO for Tx/Rx freq
818.000005 to 870 MHz
B
Is TP_VCTRL
at 1.8 to 10.8V?
Is Q0263_Pin2 = 1.7 to 1.8 VDC?
Inspect L0265
~1.2-1.5 VDC at the
base of Q0201?
Inspect R0269, R0265, R0268,
R0267, R0261, R0275, L0264,
Q0262
~0.35-0.55 VDC at
emitter of Q0201?
Inspect R0312, L0263
Inspect L0201, VR0200, VR0201,
VR0202, VR0203, L0202, C0202,
C0203, L0203, C0205, C0206,
C0207, C0208, R0201, C0221,
L0208, R0224, R0225, U0301,
C0320, C0328
Refer to FGU Section
~4.1-4.3 VDC at collector
of Q0201
Inspect Q0261, Q0263,
E0260, U0301, C0322,
C0328, U0001
Check VCO Vctrl at TP_VCTRL
A
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