Table 3-1. Direct Support Troubleshooting - continued
TEST OR INSPECTION
BACKWASH PUMP ASSEMBLY - continued
2. BACKWASH PUMP SHUTS DOWN AND/OR FAILS TO START (MULTIMEDIA CLEANING).
High voltages in this equipment can cause serious injury or death. When applying power during a
test, take proper measures to ensure personal safety. Never work on electrical equipment unless
there is another person nearby who is familiar with the operation and hazards of the equipment and
who is competent in administering first aid.
Step 1. Check if circuit breaker CB2 and/or heater assembly are tripped.
If circuit breaker or heater is tripped, go to Malfunction 2, Backwash Pump Assembly.
Step 2. Check if other pumps operate.
If other pumps work, go to Malfunction 1, ROWPU Assembly.
Step 3. Check if relay K3 is on.
If relay is not on go to step 7.
Step 4. Check voltage at BACKWASH PUMP jack, J2.
If voltage is measured, go to step 6.
Step 5. Perform a continuity check of power circuit as follows; make additional point-to-point checks as necessary to
isolate fault to a specific component.
To check continuity through K2 it is necessary to close contacts by physically raising handle on side
of relay while making the check.
L3, CBI or J10(C)
L2, CB1 orJ10(B)
L1, CBI or J10(A)