Motorola CDM1550-LS+ - Page 5

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2.10 Control Head (COM 1550•LS+) .......................................................................... 2-31
2.1 0.1 Power Supplies ..................................................................... .. ..... ........ 2-31
2.10.2 Power On I Off ............... ............................................................... . ... . .. 2-32
2.1 0.3 Microprocessor Circuit ................................. .. .................. .. .................. 2-32
2.10.4 SBEP Seriallnterface ................................................... .... ...... ... .......... 2-32
2.1 0.5 Keypad Keys .......................................... ... ........................... .. . ... .. .. ...... 2-33
2.10.6
Status LED and Back Light Circuit.. .............. .. ...................... .. .. ... ........ 2-33
2.1 0. 7 Liquid Crystal Display (LCD) ................................................................ 2-33
2.1 0.8 Microphone Connector Signals ........................................................ .. .. 2-34
2.1 0.9 Speaker ................................................................................ .. .. ............ 2-35
2.1 0.1 0 Electrostatic Transient Protection .. ....... .. .................... ..... ............ .. .. .. .. 2-35
2.11 PassPort Trunking Controller Board (PTCB) .. .. . .. .... .... .................................... .. 2-35
Chapter 3 Maintenance
3.1 Introduction ...................................................................... .. .................................. 3-1
3.2 Preventive Maintenance .. ... .... ........................ .. ............. ... .. ... ... ........................... 3-1
3.2.1 Inspection ................................ ... ............................ .. . .. ........................... 3-1
3.2.2 Cleaning ........... .. ....... ......... ... ........... .. ... .. ....... .. ......... .. ......................... .. 3-1
3.3 Safe Handling of CMOS and LDMOS ................................ .. .... . .. .. ............. .. ..... .. . 3-2
3.4 General Repair Procedures and Techniques ........................ .... ..... .... .. .. .... . .... .. .. 3-2
3.5 Recommended Test
Tools ....... .. . ... .......................................... ................ ... .. .. .. ... 3-5
3.6 Receiver
Troubleshooting Chart (200 MHz) .............................................. .. .... .. .. 3-6
3.7 Receiver Troubleshooting Chart (700 MHz) ............ .. .......... .... ........ .. ..... .. .. .. .. ..... 3-8
3.8 Transmitter
Troubleshooting Chart (200 MHz) ............................ .. .................. .. 3-10
3.9 Transmitter Troubleshooting Chart (700 MHz) .................................................. 3-11
3.10 Synthesizer Troubleshooting Chart (200 MHz) ............ .. ... .. ............................... 3-12
3.11 Synthesizer Troubleshooting Chart (700 MHz) ............. .. .. .............. ... ....... .. .. ... .. 3-13
3.12
VCO Troubleshooting Chart (200 MHz) ............................................................. 3-15
3.13 VCO Troubleshooting Chart (700 MHz) ...................................... .... ..... .. ............ 3-16
Chapter 4
Schematic Diagrams, Overlays,
and Parts Lists
4.1 Introduction ....................................... .. ............................................................... .. 4-1
4.1.1 Notes For All Schematics and Circuit Boards ........................................ 4-1
Figure 4-1. CDM1550•LS+ Control Head Top Overlay ..................................... .. ... 4-3
Figure 4-2. CDM1550•LS+ Control Head Bottom Overlay ........... ...................... .. .. 4-4
Figure 4-3.
CDM1550•LS+ Control Head Schematic Diagram ....... .. ............... .. ..... 4-5
Figure 4-4.
CDM1550•LS+ Control Head Keypad Schematic ................................ 4-6
Figure 4-5. CDM1550•LS+ Control Head Backlight Schematic ... .. ............... .. ........ 4-7
Figure 4-6.
CDM1550•LS+ Control Head Display Schematic ..... .. ......................... 4-8
CDM1550•LS+ Control Head Parts List.. ..................................................................... 4-9
Figure 4-7. 200 MHz Main Board Top Side PCB ........................ ....... ... .. .. ........... .4-11
Figure 4-8.
200 MHz Main Board Bottom Side PCB ................................... .. .. .. .. .4-12
Figure 4-9.
200 MHz Receiver Front End Schematic Diagram .............. .. .. .. ........ 4-13