T M 1 0 - 4 6 1 0 - 2 3 2 - 12
Table 4-2. Unit Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 1. Remove connector P15 and P12 from the control panel. Check for 110-120 VAC across J15C and
If voltage is not present, notify direct support maintenance.
Step 2. Check for continuity acmes P15C and P15D. Hold the level switch so the float is down. No power.
(a) If the continuity check is okay, go to step 3.
(b) If there is no continuity, go to step 4.
Step 3. Raise the float and check for continuity between pins P15C and P15G.
if the continuity check is okay, notify direct support maintenance to troubleshoot the control panel.
Step 4. Remove connector P30 from the JB3 junction panel. Check for continuity across J30A and J30E with
the float set as in step 3. Let the float drop and check for continuity across J30A and J30B.
if troth continuity checks are okay, replace the cable between PI 5 and P30 (para. 4-27).
Step 5. Refer to the electrical schematic Appx. l-1. Check for continuity, point-to-point, from J30A and
(a) Repair any hose or damaged wire (para. 4-32).
(b) Replace connector J30 assembly if faulty (para. 4-32.
(c) Replace LSL1 (Reference interconnection Diagram FO-2, Sheet 14) if it shows and open
circuit (para. 4-54).
Step 6. Refer to the electrical schematic Appx. l. Check for continuity, point-to-point, from J30A to J30E with
the float lifted as in step 3.
(a) Repair any hose or damaged wire (para. 4-32).
(b) Replace connector J30 assembly if faulty (para. 4-32).
(c) Replace LSL1 if it shows an open circuit (para. 4-54).
CLEAN/FLUSH TANK LOW LEVEL indicator light or warning horn does not work (Reference Schematic Dia-
gram FO-1, Sheet 9, schematic line 932 and Schematic Diagram FO-1, Sheet 10, schematic line 1010). Refer
to light testing and alarm circuit troubleshooting for additional test procedures.
Notify direct support maintenance.
Vent fan does not work preference Schematic Diagram FO-1, Sheet 10. schematic line 1023).
Step 1.
Step 2.
(a)
(b)
Step 3.
Step 4.
(a)
(b)
(c)
Step 5.
Step 6.
Remove connector P53 from the top of switch box 2. Check for 110-120 VAC between J53A and J53B
(Reference Interconnection Diagram FO-2, Sheet 15) with fan switch “ON”.
if voltage is not present, go to step 3.
Remove and tag the wires to the fan motor. Check the cable and connector for continuity and shorts
on each wire.
Replace the cable assembly if open or shorted (para. 4-69).
Replace the fan assembly if no cable faults are found (para. 4-69).
Remove connector P52 from the side of the switch box 2. Check for 110-120 VAC between P52C and
P52J (Reference interconnection Diagram FO-2, Sheet 15).
if voltage is not present, go to step 5.
Check continuity, point-to-point, from J52B to J53A and from J52J to J53B.
Repair any loose or damaged wire (para. 4-31).
Replace switch SS7 if open (Reference interconnection Diagram FO-2, Sheet 15) (para. 4-31).
Replace either electrical connector assembly if faulty (para. 4-31).
Remove connector P12 (Reference Interconnection Diagram FO-2, Sheet 15) from the side of the
control panel. Check for 110-120 VAC between J12C a J12J, (Reference interconnection Diagram
FO-2, Sheet 9).
If voltage is not present, notify direct support maintenance.
Check continuity from P12C to P52C and from P12J to P52J.
Replace the cable if open (para. 4-27).
4-48 Change 1
J12J.
J30B.
8.
