Motorola MOTOTRBO XPR 7550e

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Troubleshooting Charts 5-19

Figure 5-19.Troubleshooting Flow Chart for VCO (Sheet 2 of 2)

Yes

START

Check Vctrl at TP_VCO_VCTRL

Is TP_VCO_VCTRL

at 1.5 to 10.5V?

Is Q0233_Pin2=1.8VDC?

Inspect L0281, R0282

~1.5-18VDC at the

base of Q0202?

Inspect R0285, R0286, R0293,

L0282, R0283

~0.7-1VDC at

emitter of Q0202?

Inspect R0262, L0261

Inspect L0200, VR0204, VR0205,

VR0206, VR0207, L0251, C0252,

C0253, L0252, L0253, C0254,

C0255, C0262, C0264, R0261

Refer to FGU Section

~3-3.2VDC at collector

of Q0202

Inspect U0001

940 MHz VCO

Motorola MOTOTRBO XPR 7550e - Page 49