Figure 1-O. Modem Unit MD-1149/MYQ-4A
CHAPTER 1 INTRODUCTION - TM-11-7025-234-230009
REFERENCE INFORMATION
Section Il. EQUIPMENT DESCRIPTION
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - TM-11-7025-234-230012
FIGURE 1-1. V.29 Modem External Components (2 of 2)
Figure 1-2. V.29 Modem Internal Components (1 of 2)
Figure 1-2. V.29 Modem Internal Components (2 of 2)
EQUIPMENT IDENTIFICATION PLATE
Modem Mounting Options
Figure 1-5. Jumper Locations
Figure 1-6. Transmit Output Level Switch
Figure 1-7. Location of Mother Board Jumpers
Figure 1-8. Interface Board (A3) Jumpers
Figure 1-9. Control Board (A4) Jumpers and Dip Switch
Table 1-1. Control Board (A4) Dip Switch Jumpers
Table 1-2. Control Board (A4) Plug Jumpers
Table 1-2. Control Board (A4) Plug Jumpers cont'd
Figure 1-10. Remote Loopback Board (A8) Plug Jumper
Figure 1-11. Domestic 1/0 Board (A9), Rear Panel Connectors
Figure 1-12. Interface Signals
Table 1-3. Interface Signal Descriptions
Table 1-3. Interface Signal Descriptions cont'd
Figure 1-13. 1/0 Board (A9) Jumpers (Backside)
Table 1-4. Domestic 1/0 Board (A9) Jumpers -- Continued
Chapter 2 TECHNICAL PRINCIPLES OF OPERATION
Figure 2-2. Mother Board Controls and Indicators (1 of 2)
Figure 2-2. Mother Board Controls and Indicators (2 of 2)
Figure 2-3. Front Panel Controls and Indicators (1 of 2)
Figure 2-3. Front Panel Controls and Indicators (2 of 2)
FUNCTIONAL DESCRIPTION
Figure 2-4. V.29 Modem Assembly Functional Block Diagram
Figure 2-5. Power Supply Regulator Board (Al)
UNATTENDED REMOTE LOOPBACK
SELF TEST AND FAULT ISOLATION
Chapter 3 ORGANIZATIONAL MAINTENANCE INSTRUCTIONS
Section Ill. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
RUN SELF TEST
RUN SELF TEST (CONT)
CHAPTER 4 DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
Figure 4-1. Troubleshooting
TROUBLESHOOTING PHASES
Table 4-1. Flow Chart Symbols
MODEM CHECKOUT/SYMPTOM INDEX
INDICATOR FAILS LAMP CHECK
MODEM FAlLS SELF TEST
Section Ill. MAINTENANCE PROCEDURES
ACCESS/CLOSE UP V.29 MODEM
ACCESS/CLOSE UP v.29 MODEM cont'd
REMOVE/REPLACE POWER SUPPLY ASSEMBLY
CHECK/ADJUST POWER SUPPLY VOLTAGE
CHECK/ADJUST POWER SUPPLY VOLTAGE (CONT)
REMOVE/REPLACE FUSE
REMOVE/REPLACE RATE/MODE DISPLAY BOARD
REMOVE/REPLACE RATE/MODE DISPLAY BOARD (CONT)
REMOVE/REPLACE INPUT/OUTPUT BOARD
REMOVE/REPLACE MOTHER BOARD
REMOVE/REPLACE CIRCUIT BOARDS Al THRU A8
APPENDIX A REFERENCES - TM-11-7025-234-230067
APPENDIX B MAINTENANCE ALLOCATION CHART - TM-11-7025-234-230069
Replace
EXPLANATION OF SECTION III COLUMN ENTRIES
Section II. MAINTENANCE ALLOCATION CHART - TM-11-7025-234-230072
Section III - TM-11-7025-234-230073
SECTION IV MAINTENANCE ALLOCATION CHART FOR MODEM UNIT MD-1149/MYQ-4A
APPENDIX C EXPENDABLE SUPPLIES AND MATERIALS LIST
APPENDIX D SCHEMATIC DIAGRAMS
GLOSSARY - TM-11-7025-234-230079
Properties
FO-1: V.29 Modem Power Supply
FO-2: Transmitter Block Diagram
FO-3: Receiver Block Diagram (1 of 2)
FO-3: Receiver Block Diagram (2 of 2)
Official Business - TM-11-7025-234-230100
TM-11-7025-234-23 Modem Unit MD-1149/MYQ-4A Manual
CHAPTER 1 INTRODUCTION - TM-11-7025-234-230009
REFERENCE INFORMATION
Section Il. EQUIPMENT DESCRIPTION
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - TM-11-7025-234-230012
FIGURE 1-1. V.29 Modem External Components (2 of 2)
Figure 1-2. V.29 Modem Internal Components (1 of 2)
Figure 1-2. V.29 Modem Internal Components (2 of 2)
EQUIPMENT IDENTIFICATION PLATE
Modem Mounting Options
Figure 1-5. Jumper Locations
Figure 1-6. Transmit Output Level Switch
Figure 1-7. Location of Mother Board Jumpers
Figure 1-8. Interface Board (A3) Jumpers
Figure 1-9. Control Board (A4) Jumpers and Dip Switch
Table 1-1. Control Board (A4) Dip Switch Jumpers
Table 1-2. Control Board (A4) Plug Jumpers
Table 1-2. Control Board (A4) Plug Jumpers cont'd
Figure 1-10. Remote Loopback Board (A8) Plug Jumper
Figure 1-11. Domestic 1/0 Board (A9), Rear Panel Connectors
Figure 1-12. Interface Signals
Table 1-3. Interface Signal Descriptions
Table 1-3. Interface Signal Descriptions cont'd
Figure 1-13. 1/0 Board (A9) Jumpers (Backside)
Table 1-4. Domestic 1/0 Board (A9) Jumpers -- Continued
Chapter 2 TECHNICAL PRINCIPLES OF OPERATION
Figure 2-2. Mother Board Controls and Indicators (1 of 2)
Figure 2-2. Mother Board Controls and Indicators (2 of 2)
Figure 2-3. Front Panel Controls and Indicators (1 of 2)
Figure 2-3. Front Panel Controls and Indicators (2 of 2)
FUNCTIONAL DESCRIPTION
Figure 2-4. V.29 Modem Assembly Functional Block Diagram
Figure 2-5. Power Supply Regulator Board (Al)
UNATTENDED REMOTE LOOPBACK
SELF TEST AND FAULT ISOLATION
Chapter 3 ORGANIZATIONAL MAINTENANCE INSTRUCTIONS
Section Ill. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
RUN SELF TEST
RUN SELF TEST (CONT)
CHAPTER 4 DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
Figure 4-1. Troubleshooting
TROUBLESHOOTING PHASES
Table 4-1. Flow Chart Symbols
MODEM CHECKOUT/SYMPTOM INDEX
INDICATOR FAILS LAMP CHECK
MODEM FAlLS SELF TEST
Section Ill. MAINTENANCE PROCEDURES
ACCESS/CLOSE UP V.29 MODEM
ACCESS/CLOSE UP v.29 MODEM cont'd
REMOVE/REPLACE POWER SUPPLY ASSEMBLY
CHECK/ADJUST POWER SUPPLY VOLTAGE
CHECK/ADJUST POWER SUPPLY VOLTAGE (CONT)
REMOVE/REPLACE FUSE
REMOVE/REPLACE RATE/MODE DISPLAY BOARD
REMOVE/REPLACE RATE/MODE DISPLAY BOARD (CONT)
REMOVE/REPLACE INPUT/OUTPUT BOARD
REMOVE/REPLACE MOTHER BOARD
REMOVE/REPLACE CIRCUIT BOARDS Al THRU A8
APPENDIX A REFERENCES - TM-11-7025-234-230067
APPENDIX B MAINTENANCE ALLOCATION CHART - TM-11-7025-234-230069
Replace
EXPLANATION OF SECTION III COLUMN ENTRIES
Section II. MAINTENANCE ALLOCATION CHART - TM-11-7025-234-230072
Section III - TM-11-7025-234-230073
SECTION IV MAINTENANCE ALLOCATION CHART FOR MODEM UNIT MD-1149/MYQ-4A
APPENDIX C EXPENDABLE SUPPLIES AND MATERIALS LIST
APPENDIX D SCHEMATIC DIAGRAMS
GLOSSARY - TM-11-7025-234-230079
Properties
FO-1: V.29 Modem Power Supply
FO-2: Transmitter Block Diagram
FO-3: Receiver Block Diagram (1 of 2)
FO-3: Receiver Block Diagram (2 of 2)
Official Business - TM-11-7025-234-230100
TM-11-7025-234-23 Modem Unit MD-1149/MYQ-4A Manual
