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8.3 Dual Tone Multiple Frequency (DTMF) Data ...............................................2-18

9.0 Receive Audio Circuits.......................................................................................2-19

9.1 Squelch Detect .............................................................................................2-19

9.2 Audio Processing and Digital Volume Control.............................................. 2-20

9.3 Audio Amplification Speaker (+) Speaker (-)................................................2-20

9.4 Handset Audio..............................................................................................2-21

9.5 Filtered Audio and Flat Audio .......................................................................2-21

10.0 Receive Signalling Circuits ................................................................................2-21

10.1 Sub-Audio Data (PL/DPL) and High Speed Data Decoder ..........................2-21

10.2 Alert Tone Circuits........................................................................................ 2-22

Chapter 3

TROUBLESHOOTING CHARTS

1.0 Troubleshooting Flow Chart for Receiver RF (Sheet 1 of 2)................................3-2

1.1 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2) ................................3-3

2.0 Troubleshooting Flow Chart for 40W Transmitter (Sheet 1 of 3) .........................3-4

2.1 Troubleshooting Flow Chart for 40W Transmitter (Sheet 2 of 3)....................3-5

2.2 Troubleshooting Flow Chart for 40W Transmitter (Sheet 3 of 3)....................3-6

3.0 Troubleshooting Flow Chart for Synthesizer........................................................3-7

4.0 Troubleshooting Flow Chart for VCO...................................................................3-8

5.0 Troubleshooting Flow Chart for DC Supply (1 of 2).............................................3-9

5.1 Troubleshooting Flow Chart for DC Supply (2 of 2) .....................................3-10

Chapter 4

UHF1 PCB/ SCHEMATICS/ PARTS LISTS

1.0 Allocation of Schematics and Circuit Boards .......................................................4-1

1.1 UHF1 and Controller Circuits .........................................................................4-1

2.0 UHF1 25-40W PCB 8486577Z02 / Schematics...................................................4-3

2.1 UHF1 PCB 8486577Z02 Parts List 40W ......................................................4-19

Motorola CM160 Service Information

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