TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
19. Clean/flush tank valve light does not work. Light test okay. Clean/flush tank valve light does not show actual valve
position. (Ref. Schematic diagram FO-1, sheet 7, schematic line 736).
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Remove the #2A wire from PL18 (REF:
Interconnection diagram FO-2, Sheet 12). Check continuity, point-to-point, from CB9 (REF: Interconnection diagram
FO-2, Sheet 8) to wire #307 on PL18.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace/repair J15 (REF: Interconnection diagram FO-2, Sheet 9) if faulty (para. 2-21).
(c) Replace/repair P15 (REF: Interconnection diagram FO-2, Sheet 7) or J33 (REF: Interconnection
diagram FO-2, Sheet 14) if faulty (para. 2-7).
(d) Replace LTK3 (REF: Interconnection diagram FO-2, Sheet 7) if its contact is open (para. 2-23).
20. Media filter flush valve light does not work. Light test okay. Media filter flush valve lightdoes not show the actual valve
position. (Ref. schematic diagram FO-1, sheet 7, schematic line 707).
Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Remove the #2A wire from PL2 (REF:
Interconnection diagram FO-2, Sheet 11). Check continuity, point-to-point, from CB9 (REF: Interconnection diagram
FO-2, Sheet 8) to wire #272 on PL12 (REF: Interconnection diagram FO-2, Sheet 12).
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace/repair J14 (REF: Interconnection diagram FO-2, Sheet 9) if faulty (para. 2-21).
(c) Replace/repair P14 or J48 (REF: Interconnection diagram FO-2, Sheet 15) if faulty (para. 2-7).
(d) Replace LTK2 (REF: Interconnection diagram FO-2, Sheet 7) if its contact is open (para. 2-23).
21. Media filter flush valve will not open in filter backwash or when the flush valve switch is pushed. Pilot light off. (Ref.
Schematic diagram FO-1, sheet 7, schematic lines 706-707).
Refer to media filter backwash phase 1 circuit troubleshooting.
22. Media filter flush valve will not close in filter backwash or when the flush valve switch is pushed. Pilot light on. (Ref.
Schematic diagram FO-1, sheet 7, schematic line 708).
Step 1. Check valve for actual position.
If valve is closed, refer to valve light does not show correct valve position troubleshooting (malfunction 20).
Step 2. Shut down ROWPU and generator, Refer to electrical drawings in Appendix D. Check continuity, point-to-
point, from transformer T1(X2) (REF: Interconnection diagram FO-2, Sheet 10) to J14D (REF: interconnection
diagram FO-2, Sheet 9).
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace/repair connector J14 if faulty (para. 2-21).
(c) Refer to media filter backwash phase 1 circuit troubleshooting if the above checks have not isolated
the problem.
AIR BLOWDOWN SOLENOID.
Air blowdown solenoid valve does not work. (Ref. Schematic diagram FO-1, sheet 8, schematic lines 826-827).
NOTE
If unit maintenance troubleshooting indicates that the control panel portion of the air
blowdown solenoid circuits is okay, start troubleshooting at step 3.
Step 1. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Remove the #2A wire from
TDK1 (REF: Interconnection diagram FO-2, Sheet 8) and disconnect the P13 (REF: interconnection diagram
FO-2, Sheet 14) connector on the control panel. Check continuity from terminal 1-23 to relay TDK1 (terminal
11) and to TDK1 (terminal 4). Also, check continuity from transformer T1(X2) (REF: Interconnection diagram
FO-2, Sheet 10) to TDK1 (wire #2A) and to connector J13U (REF: interconnection diagram FO-2, Sheet 9).
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace/repair connector J13 if faulty (para. 2-21).
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