ARMY TM 9-6115-672-14 AIR FORCE TO 35C2-3-444-32 MARINE CORPS TM 09244A/09245A-14 2-14   TABLE 2-4.  DIAGNOSTIC CONTROLS AND INDICATORS (continued) KEY CONTROL OR INDICATOR FUNCTION I/O INTERFACE MODULE 36 HEARTBEAT (green LED) This indicator is normally blinking on and off when DC power has been applied to the module.  It is also normally blinking when the generator set is operating (engine running) and the module is functioning properly.  If the indicator is either steady- state lit or steady-state off, but the CIM has been turned on and the engine is operating, this is an indication that there is a problem in the I/O interface module. 37 DIP Switch Assembly (8 positions) These switches define the configuration of the generator set for the CIM.  The generator set configuration is defined in two ways:  its output power (kW) rating and its frequency rating.   These switches must be set to a specified configuration prior to the module's use in the generator set.  Unless these switches are properly set (and remain so), the generator set can experience a malfunction.  For the MEP-806B, all switches are set to OFF.   For the MEP-816B, Switch 5 is set to ON and all the other switches to OFF. (Ref Figure 4-31) SECTION II.  PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) 2.5 GENERAL. To ensure the generator set is ready for operation at all times, it must be inspected so that defects can be discovered and corrected before they result in serious damage or failure. 2.5.1 Before Operation.  Always keep in mind the CAUTIONS and WARNINGS.  Perform Before (B) PMCS. 2.5.2 During Operation. Always keep in mind the CAUTIONS and WARNINGS.  Perform During (D) PMCS. 2.5.3 After Operation.  Perform After (A) PMCS. 2.5.4 If the Equipment Fails.  If the equipment does not perform as required, refer to Chapter 3, Section II under Troubleshooting for possible problems.  The Symptom Index is provided as a guide for troubleshooting procedures.  Report any malfunctions or failures on DA Form 2404 (refer to DA PAM 738-750). 2.6 PMCS Procedures. NOTE For general location of items to be inspected in Table 2-5, refer to Figures 1-30 and 2-1. 2.6.1 Purpose of PMCS Table.  PMCS, Table 2-5, lists inspections and care of equipment required to keep the generator set in good operating condition. 2.6.2 Purpose of Service Intervals.  The interval column of the PMCS table indicates when to perform a certain check or service. 2.6.3 Special Instructions.  The following guidelines are provided to help classify leaks observed while performing PMCS. Class I. Seepage of fluid (as indicated by wetness or discoloration) not great enough to form drops.