TM 10-4610-232-34Table 2-1. Direct Support Troubleshooting Guide (Continued)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONStep 3. Check continuity, point-to-point, from J11F to K23(K1). Depress the indicating plungers on K6 and K23when testing continuity across their contacts.(a) Repair any loose or damaged wire (para. 2-20).(b) Replace/repair connector J11 if faulty (para. 2-21).(c) Replace relay K6 (REF: Interconnection diagram FO-2, Sheet 7) or K23 if their set of contacts does notshow continuity when the indicating plunger is depressed (para. 2-23).(d) Replace relay K23 if all the above checks have not pin pointed problem (para. 2-23).Strainer high differential light or horn does not work. (Ref. Schematic diagram FO-1, sheet 9, schematic lines 909-910and schematic diagram FO-1, sheet 10, schematic line 1006).NOTERefer to malfunctions 7 and 9 for additional troubleshooting. Also, see light test andalarm circuit troubleshooting..Step 1. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Remove the wires fromA3X/A3Y and A2X/A2Y on relay K23 (REF: Interconnection diagram FO-2, Sheet 7). Check for continuityacross each contact with the indicating plunger of K23 out. Push the indicating plunger in and check thatthere is no continuity across the contact.Step 2. Check the wires that were removed in step 1 for looseness or damage at their preceding connections.Repair any loose or damaged wires (para. 2-20).Basket strainer light is on and basket strainer is clean or light is not on and strainer is plugged.Test strainer differential switch (PDSH1) for accuracy. Disconnect J24 (REF: Interconnection diagram FO-2, Sheet14) from the pressure switch panel. Disconnect the pressure sensing lines from the switch. Remove the cover on theswitch and tag/remove the wires from the pressure switch. Check for internal water leakage. Set a multimeter to theOhms x 1 scale and attach the leads to the switch terminals that the wires were on. Connect a dead-weight tester oranother known calibrated pressure control device to the switch high pressure (or inlet) port. The multimeter shouldread zero resistance with no pressure on the inlet pressure port. Slowly apply pressure to the switch. The switchshould open on an increasing pressure of 14 to 16 psig.(a) Replace the switch if there is internal leakage (para. 2-27).(b) Adjust the switch to the correct setting if it does not actuate as described above. Remove theadjustment cover and turn the adjuster clockwise to increase the actuation point counterclockwise tolower it (para. 2-29). Replace the switch if it cannot be adjusted (para. 2-27).(c) Check the accuracy of the gauge that Ied to this malfunction if the switch is operating correctly.~ 10. Media filter high differential switch does not work. (Ref. Schematic diagram FO-1, sheet 9, schematic lines 911-9-12).NOTEThis switch is factory set to open at 25 psig.NOTERefer to malfunctions 11 and 12 for additional troubleshooting.Step 1. Shutdown ROWPU and generator. Refer to the electrical schematic Appendix D. Check continuity, point-to-point, from J24A to J24N (REF: Interconnection diagram FO-2, Sheet 14).(a) Repair any loose or damaged wire (para. 2-28).(b) Replace/repair connector J24 if faulty (para. 2-28).(c) Replace PDSH2, if it shows an open circuit (para. 2-27).2-24Change 1
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