CHAPTER 4 DIRECT SUPPORT MAINTENANCE INSTRUCTIONS

TM 11-7025-234-23

CHAPTER 4

DIRECT SUPPORT MAINTENANCE INSTRUCTIONS

Index of Maintenance Procedures

Paragraph No.

Title

Page No.

4-11

Access/Close Up V.29 Modem

4-9

4-12

4-11

Remove/Replace Power Supply Assembly

4-13

Check/Adjust Power Supply Voltage

4-12

4-14

Remove/Replace Fuse

4-15

Remove/Replace Rate/Mode Display Board

4-15

4-16

Remove/Replace Input/Output Board

4-17

Remove/Replace Mother Board

4-18

4-19

Remove/Replace Circuit Boards Al thru A8

Section 1. REPAIR PARTS, SPECIAL TOOLS,

TMDE AND SUPPORT EQUIPMENT

4-1. COMMON TOOLS AND EQUIPMENT

For authorized common tools and equipment, refer to the Modified Table of

Organization and Equipment (MTOE) applicable to your modem.

4-2. SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT

Refer to TM 11-701O-2O5-23P for a complete listing and description of special

tools, TMDE and support equipment required by direct support maintenance. Also

refer to appendix B for a list of tools pertaining to the modem.

4-3. SPARES AND REPAIR PARTS

Refer to TM 11-701O-2O5-23P for a complete listing and description of spares and

repair parts required for direct support maintenance of this equipment.

Section Il. TROUBLESHOOTING

Failure of this equipment is usually determined by a system level diagnostic

program. See your system manual for instructions. Upon determination of equipment

failure, the modem assembly is removed from the system for fault isolation.

The most effective way to find a fault in this equipment is to follow a routine

which guides you through the five phases of troubleshooting (fig. 4-l). By

following this routine you assure accurate use of fault isolation and fix

procedures. You will also improve your troubleshooting skills.

4-1