TM  5-6675-320-14 4-29.  MAINTENANCE  PROCEDURES. a. This    section    contains    instructions    covering    direct/general    support maintenance   functions   for   the   X-Y   graphics   plotter. Personnel    required    are    listed only    if    the    task    requires    more    than    one. b.    After    completing    each    maintenance    procedure,    perform    operational    check    to    be sure    that    equipment    is    properly    functioning . INDEX PROCEDURE PARAGRAPH Pen     Adjustments.     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     4-29.1 Pen Arm Adjustment (X-Drive) . . . . . . . . . . . . . . . . . . . . . 4-29.2 Cable Tension Adjustment . . . . . . . . . . . . . . . . . . . . . . . 4-29.3 X- and Y-Limit Switch Adjustment . . . . . . . . . . . . . . . . . . . 4-29.4 X-Axis Motor Driver Adjustments . . . . . . . . . . . . . . . . . . . . 4-29.5 Y-Axis Motor Driver Adjustments . . . . . . . . . . . . . . . . . . . . 4-29.6 Printed Circuit Assembly (PCA) Replacement. . . . . . . . . . . . . . . 4-29.7 Electrostatic Table (Platen) Replacement . . . . . . . . . . . . . . . 4-29.8 X-Limit Switch Replacement . . . . . . . . . . . . . . . . . . . . . . 4-29.9 Y-Limit Switch Replacement . . . . . . . . . . . . . . . . . . . . . . 4-29.10 Transformer     Replacement     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     4-29.11 Fan     Replacement.     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     4-29.12 Pen     Solenoid     Replacement.     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     4-29.13 X-     and     Y-Drive     Motor     Replacement.     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     4-29.14 X-Drive     Cable     Replacement     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     4-29.15 X-Cable Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . 4-29.16 Y-Cable Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . 4-29.17 HP-IB     Logic     Board     Replacement     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     .     4-29.18 Interface Cable Assembly Replacement . . . . . . . . . . . . . . . . . 4-29.19 4-251