Motorola Radius CM200

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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 Synthesizer........................................................3-4
3.0 Troubleshooting Flow Chart for VCO...................................................................3-5
4.0 Troubleshooting Flow Chart for DC Supply (1 of 2).............................................3-6
4.1 Troubleshooting Flow Chart for DC Supply (2 of 2).....................................3-7
Chapter 4 VHF2 PCB/ SCHEMATICS/ PARTS LISTS
1.0 Allocation of Schematics and Circuit Boards .......................................................4-1
1.1 VHF2 and Controller Circuits .......................................................................4-1
2.0 VHF 1–25 W Band 2 PCB 8488977U01 (rev. P9) / Schematics ......................... 4-3
VHF2 Interconnection between Main Board and Power Amplifier
Compartment ......................................................................................................4-3
VHF2 (146–174 MHz) 1–25 W 8488977U01 (rev. P9) .......................................4-4
VHF2 (146–174 MHz) 1–25 W 8488977U01 (rev. P9) .......................................4-5
VHF2 (146–174 MHz) 1–25 W Main Circuit (Sht 1 of 2) .....................................4-6
VHF2 (146–174 MHz) 1–25 W Main Circuit (Sht 2 of 2) .....................................4-7
VHF2 (146–174 MHz) 1–25 W Transmitter (Sht 1 of 2) .....................................4-8
VHF2 (146–174 MHz) 1–25 W Transmitter (Sht 2 of 2) ......................................4-9
VHF2 (146–174 MHz) 1–25 W Synthesiser and VCO (Sht 1 of 2) ...................4-10
VHF2 (146–174 MHz) 1–25 W Synthesiser and VCO (Sht 2 of 2) ...................4-11
VHF2 (146–174 MHz) 1–25 W Receiver Front and Back End (Sht 1 of 2) ....... 4-12
VHF2 (146–174 MHz) 1–25 W Receiver Front and Back End (Sht 2 of 2) ....... 4-13
VHF2 (146–174 MHz) 1–25 W DC and Audio Circuits (Sht 1 of 2) ...................4-14
VHF2 (146–174 MHz) 1–25 W DC and Audio Circuits (Sht 2 of 2) .................. 4-15
VHF2 (146–174 MHz) 1–25 W Microprocessor and Controller Circuits
(Sht 1 of 2) .........................................................................................................4-16
VHF2 (146–174 MHz) 1–25 W Microprocessor and Controller Circuits
(Sht 2 of 2) ........................................................................................................4-17
VHF2 (146–174 MHz) 1–25 W Power Control Circuit .......................................4-18
2.1 VHF2 PCB 8488977U01 (rev. P9) Parts List 1–25 W ............................... 4-19
3.0 VHF 1–25 W Band 2 PCB 8486672Z01 / Schematics.......................................4-29
VHF2 Interconnection between Main Board and Power Amplifier
Compartment ....................................................................................................4-29