Motorola Professional GP680 Service-informatie - Pagina 21

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Troubleshooting Flow Chart for Transmitter

3.0

Troubleshooting Flow Chart for Transmitter

1. Check Pin Diodes

2. Check Harmonic Filter

Inspect/Repair Tx.

Yes

Is Current

OK?

Output Network

Is Power

OK?

Yes

Done

START

No Power

Is There

Yes

B+ Bias for

Ant switch

CR101

Is Control Voltage High

or Low at C119

Check Drive to

Module

Is Drive

OK?

Yes

Inspect PA Network/

Check Power Out of

U101 at Cap C160

Yes

Is Power

OK?

Done

Check Q111

Low

High

Troubleshoot VCO

Replace U101

Yes

Is Power

OK?

Replace Q110

3-3

Check PCIC