Motorola MOTOTRBO XPR 7550e - Page 48

5-18 Troubleshooting Charts
Figure 5-18.Troubleshooting Flow Chart for VCO (Sheet 1 of 2)
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START
806MHz VCO?
A
Check Vctrl at TP_VCO_VCTRL
Is TP_VCO_VCTRL
at 1.5 to 10.5V?
Is Q0231_pin2 = 1.8V?
Inspect L0281, R0282
~1.5-18VDC at the
base of Q0201?
Inspect R0236, R0235, R0243,
L0232, R0233
~0.7-1VDC at
emitter of Q0201?
Inspect R0212, L0211
Inspect L0201, VR0200, VR0201,
VR0202, VR0203, L0202, C0202,
C0203, C0204, L0203, C0205,
C0211, C0212, C0214,R0211
Refer to FGU Section
~3-3.2VDC at collector
of Q0201
Inspect U0001
No
A