Motorola CM200

iv
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 TX RF (No Output Power) ................................................3-4
2.1 Troubleshooting Flow TX RF (No Output Power/No Current) .....................3-5
2.2 Troubleshooting Flow TX RF (Not Txing at Nominal power) .......................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 1-25 W Band 2 PCB 8488978U01 (rev. P9) / Schematics ..........................4-3
UHF2 Interconnection between Main Board and
Power Amplifier Compartment ............................................................................4-3
UHF2 (438-470 MHz) 1-25 W 8488978U01 (rev. P9), Top Side ........................4-4
UHF2 (438-470 MHz) 1-25 W 8488978U01 (rev. P9), Bottom Side ................... 4-5
UHF2 (438-470 MHz) 1-25 W Main Circuit (Sht 1 of 2) ......................................4-6
UHF2 (438-470 MHz) 1-25 W Main Circuit (Sht 2 of 2) ......................................4-7
UHF2 (438-470 MHz) 1-25 W Transmitter (Sht 1 of 2) .......................................4-8
UHF2 (438-470 MHz) 1-25 W Transmitter (Sht 2 of 2) .......................................4-9
UHF2 (438-470 MHz) 1-25 W Synthesiser and VCO (Sht 1 of 2) ....................4-10
UHF2 (438-470 MHz) 1-25 W Synthesiser and VCO (Sht 2 of 2) ....................4-11
UHF2 (438-470 MHz) 1-25 W Receiver Front and Back End (Sht 1 of 2) ........4-12
UHF2 (438-470 MHz) 1-25 W Receiver Front and Back End (Sht 2 of 2) ........4-13
UHF2 (438-470 MHz) 1-25 W DC and Audio Circuits (Sht 1 of 2) ....................4-14
UHF2 (438-470 MHz) 1-25 W DC and Audio Circuits (Sht 2 of 2) ....................4-15
UHF2 (438-470 MHz) 1-25 W Microprocessor and
Controller Circuits (Sht 1 of 2) ..........................................................................4-16
UHF2 (438-470 MHz) 1-25 W Microprocessor and
Controller Circuits (Sht 2 of 2) ..........................................................................4-17