Maxon Telecom SM-2000 service manual Page-58 December

MAXON SM-2000 MOBILE

TROUBLE SHOOTING CHART (SM-2000)

No TX

1.Defective MIC

2.Defective CPU IC409

3.Defective IC412

No TX Power

1.Defective TX enable Q122

2.Defective APC Control Circuit Q125

3.Defective TX Power Buffer AMP Q116 and Q117

4.Defective TX Power Amp (SM-2150) Q118,Q120

5.Defective TX Power Module (SM-2450) IC103

6.Defective ANT SW D108 and D120

7.Defective ANT Connector

Over Power

1.Programming

2.Q125 Short

3.Defective D107 and APC Circuit

Low TX Power Output

1.Wrong Programming

2.Defective TX AMP (SM-2150) Q116 , Q117 , Q118, Q120 and D108

3.Defective TX AMP (SM-2450) Q116 , Q117 , IC103 , and D108

4.Defective Antenna Connector

No Modulation

1.Defective MIC

2.Defective Analog SW IC412 and IC411

3.Defective 300Hz HPF IC410

4.Defective MIC AMP and Splatter Filter IC404

5.Defective Audio Buffer IC405

6.Wrong Alignment of RV402

7.Defective Analog IC401

No Encode of CTCSS/DCS

1.Wrong Programming

2.Defective CPU IC409

3.Defective IC407 and IC411

No Sensitivity

1.Defective Antenna Switch D108 , D120 , and D121

2.Defective Front-End Module

3.Defective DBM IC102

4.Defective 45MHz IF Filter CF101

5.Defective IF IC109

Wrong Frequency

1.Wrong Alignment of 12.8MHz TCXO

2.Wrong Programming

Page-58-

December 98