US Army Special Forces, Technical Manual, TM 9-1220-239-34, BALLISTICS COMPUTER, XM21, NSN 1220-00-348-8437, 1980

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US Army Special Forces, Technical Manual, TM 9-1220-239-34, BALLISTICS COMPUTER, XM21, NSN 1220-00-348-8437, 1980 Scope. a. This manual is for your use performing direct support and general support maintenance of the ballistics comp M21 (fig 1-1), hereinafter referred to a computer system. CHAPTER 1. INTRODUCTION Section I. General 1-1 1-1 II. Description and tabulated data 1-7 1-2 CHAPTER 2. DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS Section I. Service upon receipt of materiel 2-1 2-1 II. Preembarkation inspection of materiel in units altered for overseas shipment 2-5 2-32 III. Troubleshooting 2-6 2-32 IV. General Maintenance 2-8 2-37 CHAPTER 3. REPAIR INSTRUCTIONS Section I. General 3-1 3-1 II. Repair of gunner's control unit 3-3 3-1 III. Repair of ammo select unit 3-17 3-19 IV. Repair of computer unit 3-24 3-27 CHAPTER 4. FINAL INSPECTION CHAPTER 5. PREPARATION FOR STORAGE AND SHIPMENT APPENDIX A. REFERENCES A-1 B. EXPENDABLE SUPPLIES AND MATERIALS LIST B-1 INDEX 1-1 Special Tools, TMDE, and Support Equipment 2-1 Inspection Upon Receipt 2-2 Purging of Computer System Components 2-3 Gunner's Control Unit Checkout 2-4 Computer Unit Checkout 2-5 Ammo Select Unit Checkout 2-6 Troubleshooting 2-7 General Maintenance Procedures List