Motorola CM200

iv
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 40 W Transmitter (Sheet 1 of 3) ........................3-4
2.1 Troubleshooting Flow Chart for 40 W Transmitter (Sheet 2 of 3)................3-5
2.2 Troubleshooting Flow Chart for 40 W 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 UHF2 PCB/ SCHEMATICS/ PARTS LISTS
1.0 Allocation of Schematics and Circuit Boards .......................................................4-1
1.1 UHF2 and Controller Circuits.......................................................................4-1
2.0 UHF 25-40 W Band 2 PCB 8486577Z01 / Schematics .......................................4-3
UHF 2 Interconnection between Main Board and Power Amplifier
Compartment ......................................................................................................4-3
UHF2 (438-470 MHz) 25-40 W 8486577Z01, Top Side ....................................4-4
UHF2 (438-470 MHz) 25-40 W 8486577Z01, Bottom Side ................................4-5
UHF2 (438-470 MHz) 25-40 W Main Circuit (Sht 1 of 2) ....................................4-6
UHF2 (438-470 MHz) 25-40 W Main Circuit (Sht 2 of 2) ....................................4-7
UHF2 (438-470 MHz) 25-40 W Transmitter (Sht 1 of 2) .....................................4-8
UHF2 (438-470 MHz) 25-40 W Transmitter (Sht 2 of 2) .....................................4-9
UHF2 (438-470 MHz) 25-40 W Synthesiser and VCO (Sht 1 of 2) ..................4-10
UHF2 (438-470 MHz) 25-40 W Synthesiser and VCO (Sht 2 of 2) ..................4-11
UHF2 (438-470 MHz) 25-40 W Receiver Front and Back End (Sht 1 of 2) ......4-12
UHF2 (438-470 MHz) 25-40 W Receiver Front and Back End (Sht 2 of 2) ......4-13
UHF2 (438-470 MHz) 25-40 W DC and Audio Circuits (Sht 1 of 2) ..................4-14
UHF2 (438-470 MHz) 25-40 W DC and Audio Circuits (Sht 2 of 2) ..................4-15
UHF2 (438-470 MHz) 25-40 W Microprocessor and Controller
Circuits (Sht 1 of 2) ...........................................................................................4-16
UHF2 (438-470 MHz) 25-40 W Microprocessor and Controller
Circuits (Sht 2 of 2) ...........................................................................................4-17
UHF2 (438-470 MHz) 25-40 W Power Control Circuit ......................................4-18
2.1 UHF2 PCB 8486577Z01 Parts List 25-40 W .............................................4-19