TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 Figure 5-4.  Transformers T101 and T102, Schematic c. Replacement. Transformers T101, T102, and T103 (56, 58 and   80   figure   5-1,   sheet   2)   are   removed from  the  control  cubicle  base  assembly  by disconnecting and tagging wires, and removing  four  screws  (66)  on  transformer (79). 5-4.    RELAYS.    Relays  K23,  K102,  K103,  K106,  K111, K112,  K113,  and  K114  are  mounted  at  the  base  of  the control cubicle.  Refer to figure 5-1, sheet 2. RELAY ITEM NO. FUNCTION K23 63 24V DC K102 69 Overvoltage K103 60 Phase Sequence K106 82 Synch Check K111 78 Undervoltage K112 67 Reverse Power K113 71 Short Circuit K114 62 Overload WARNING BEFORE STARTING ANY MAINTENANCE PROCEDURE, SET MAINTENANCE LOCKOUT SWITCH TO LOCKOUT.    DISCONNECT  NEGATIVE CABLE   FROM   BATTERIES.   REMOVE EXTERNAL POWER BY OPENING CB101   (EXTERNAL   POWER   CIRCUIT BREAKER) AND DISCONNECTING POWER  CABLE  FROM  RECEPTACLE J101 (120V RECEPTACLE). a. 24V DC Relay K23 (63, figure 5-1). (1) Test relay K23 by connecting 24V DC and  a  single-pole  single-throw  switch as shown in figure 5-6. (a) Close   SPST   switch.   With   an ohmmeter,   check   for   an   open circuit  between  terminals  1  and 2    and    terminals    13    and    14. Meter should indicate continuity between    terminals    3    and    4, terminals 5 and 6, and terminals 11 and 12. (b) Open  SPST  switch.    With  the ohmmeter,  check  for  continuity between  terminals  1  and  2  and terminals    13    and    14.    Meter should  indicate  an  open  circuit between    terminals    3    and    4, terminals 5 and 6, and terminals 11   and   12.      If   relays   fail   this check,   replace   in   accordance with (2), below. (2) Replacement.  Relay K23 is a plug-in type relay mounted in a socket on the box assembly panel at the base of the control cubicle.  To remove, 5-7