Motorola Commercial CM Series Service Information page 4

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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
TROUBLESHOOTING CHARTS
Chapter 3
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 25W Transmitter (Sheet 1 of 3) ......................... 3-4
2.1 Troubleshooting Flow Chart for 25W Transmitter (Sheet 2 of 3).................... 3-5
2.2 Troubleshooting Flow Chart for 25W 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 UHF 1-25W PCB 8486684Z01 (Rev. O) / Schematics ........................................ 4-3
2.1 UHF1 PCB 8486684Z01 (Rev. O) Parts List 1-25W .................................... 4-19
3.0 UHF 1-25W PCB 8486684Z03 (Rev. B) / Schematics ...................................... 4-27
3.1 UHF1 PCB 8486684Z03 (Rev. B) Parts List 1-25W..................................... 4-43