Motorola HT Series Service Manual page 10
Professional series
two-way portable radios
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Also See for HT Series:
- Detailed service manual (639 pages) ,
- Detailed service manual (96 pages) ,
- Service manual (122 pages)
Table of Contents
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7.9.4.2
7.9.4.3
7.9.4.4
7.9.4.5
7.9.4.6
7.10 900 MHz Transmitter .................................................................................................. 7-16
7.10.1 Power Amplifier.............................................................................................. 7-17
7.10.2 Antenna Switch.............................................................................................. 7-17
7.10.3 Harmonic Filter .............................................................................................. 7-17
7.10.4 Power Control Integrated Circuit (PCIC)........................................................ 7-17
7.11 900 MHz Receiver ...................................................................................................... 7-18
7.11.1 Receiver Front-End........................................................................................ 7-18
7.11.2 Receiver Back-End ........................................................................................ 7-19
7.11.3 Hear Clear IC................................................................................................. 7-19
7.11.3.1 Receive Path for Radios with Hear Clear............................................. 7-20
7.11.3.2 Hear Clear Routing of Data/Signaling .................................................. 7-20
7.11.4 Automatic Gain Control Circuit ...................................................................... 7-20
7.12 Frequency Generation Circuitry.................................................................................. 7-21
7.13 900 MHz Synthesizer.................................................................................................. 7-22
7.14 900 MHz Voltage Control Oscillator (VCO) ................................................................ 7-24
Maintenance .......................................................................8-1
8.1
Introduction ................................................................................................................... 8-1
8.2
Preventive Maintenance ............................................................................................... 8-1
8.3
Inspection ..................................................................................................................... 8-1
8.3.1
Cleaning........................................................................................................... 8-1
8.4
Safe Handling of CMOS and LDMOS........................................................................... 8-2
8.5
General Repair Procedures and Techniques ............................................................... 8-2
8.6
Recommended Test Tools............................................................................................ 8-4
8.7
Replacing the Circuit Board Fuse ................................................................................. 8-5
8.8
Removing and Reinstalling the Circuit Board ............................................................... 8-7
8.9
Power Up Self-Test Error Codes .................................................................................. 8-7
8.10 UHF Band 1 Troubleshooting Charts............................................................................ 8-9
PCB 8486458Z03 ............................................................................................ 8-9
PCB 8486458Z03 .......................................................................................... 8-10
PCB 8486458Z03 (Sheet 1 of 2) ................................................................... 8-11
PCB 8486458Z03 (Sheet 2 of 2) ................................................................... 8-12
PCB 8486458Z03 (Sheet 1 of 2) ................................................................... 8-13
PCB 8486458Z03 (Sheet 2 of 2) ................................................................. 8-14
8.10.7 Troubleshooting Flow Chart for Transmitter .................................................. 8-15
8.10.8 Troubleshooting Flow Chart for Synthesizer.................................................. 8-16
Microcontroller (MCU) .......................................................................... 7-15
Low Speed Data Filter.......................................................................... 7-15
Keyboard Circuit................................................................................... 7-15
BackLight Driver and LED's.................................................................. 7-16
Voice Storage....................................................................................... 7-16
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Troubleshooting
