Section V. ARMY  TM  5-6675-238-14 MARINE CORPS TM 08839A-14/1 g. h. i. j. k. l. While holding a piece of clean, lint-free cloth to both surfaces of the tape above the read head, advance the tape by pressing the take-up tension arm (51, figure 8-10, sheet 1) toward the read head. Stop the tape near its end by releasing the take- up  tension  arm. While still holding the tape in the cloth, rewind the tape by pressing the supply tension arm (18, figure  8-10,  sheet  1)  toward  the  read  head. Remove tape from tape reader, Set SPOOLING switch to DISABLE. Press  SPU  ON  switch-indicator  to  off. 8-45.1.  Self-Test,  Operational,  and  Diagnostic  Tape Cleaning Using Tape Reader, Part No. 877406-2. a. b. c. d. Connect tape reader to SPU as shown in figure 8-2. Load tape on left side and route tape directly to the take-up reel. Wrap the free end of the tape around the take- up reel hub until no slippage occurs. Do not use masking  tape  to  secure  diagnostic  tape  to  the take up reel. Press SPU ON switch-indicator to on, e. f. g. h. i. j. Set tape reader SPL/LOOP switch to SPL and FAST/SLOW switch to FAST. Isopropyl alcohol is flammable and gives off harmful vapors. Use only in well venti- lated  area  away  from  open  flames  and sparks. Avoid prolonged or repeated inha- lation  of  vapors. NOTE If  the  tape  is  excessively  dirty,  several cleaning cycles (steps f thru h) should be made, the first with the cloth moistened with  isopropyl  alcohol. While holding a piece of clean, lint-free cloth to both surfaces of the tape, advance the tape by holding R/L switch in the R position. Stop the tape near its end by releasing the R/L switch, While still holding the tape in the cloth, rewind the  tape  by  holding  the  R/L  switch  in  the  L position, Remove tape from tape reader. Press  SPU  ON  switch-indicator  to  off. 8-46. General. General support testing of the PADS test set consists of performing the self-test procedure con- tained  in  table  8-6,  Refer  to  paragraph  8-9  for  an explanation on the use of table 8-6. Section VI. CABLE AND CONNECTOR REPAIR 8-47. Cable and Connector Repair. a. General.  Cable repair consists of connector pin replacement,  terminal  lug  replacement,  and  repair  of broken  wires  by  substituting  wires.  Connectors  are repaired by pin replacement. (1) (2) 8-106 Connector  pins  are  replaced  from  the  connec- tor rear, Remove the appropriate covers and panels  to  obtain  access  to  chassis-mounted connectors. The backshell must be disassem- bled for cable connectors. After access is obtained, remove the defective pin and cut off the wire. Prepare the new wire and crimp a new pin on the wire. If the newly prepared wire is too short, use a spare wire; usually available in cables. Insert the new pin into the connector and reassemble the equip- ment. (3) Procedures for backshell disassembly/assem- bly, pin removal and replacement, crimping tool  operation,  and  lug  replacement  are  given in  the  following  paragraphs. b. Backshell   Disassembly/Assembly.    Several  styles of backshells are used with PADS test set cables and are illustrated in figures 8-12 and 8-13. Cables may differ in minor  details  such  as  use  of  shields,  etc.  Adapt  the procedure as appropriate for the particular connection. Change   1