TM 11-6780-225-12
3-10. Operator's Troubleshooting Chart
Item No.
Trouble symptom
Probable trouble
Checks and corrective measures
1
Line pressure more or less
Defective or misadjusted pressure switch.
Adjust pressure switch or replace (refer
than 40 psi with pressur-
to higher category of maintenance).
ized input.
2
a. Water pump does not
a. Defective water pump
a. Replace (refer to higher category of
start.
maintenance).
b. Thermal overload
b. Allow pump to cool.
b. Water pump does not
a. Defective or misadjusted relief valve.
a. Adjust relief valve or replace (refer
maintain required water
to higher category of maintenance).
pressure and runs con-
stantly.
b. Worn pump
b. Replace (refer to higher category of
maintenance).
c. Defective check valve
c. Replace (refer to higher category of
maintenance).
3
Pressure difference between
Dirty filter
Clean (para 3-7J).
water outlet and inlet indi-
cators.
4
Water temperature drops
Water heater element not energized
Check that circuit breaker S and water
heater switch are set to ON.
5
Constant tripping of a circuit
a. A malfunction of the equipment con-
a. Repair or replace (refer to higher
breaker.
trolled by the circuit breaker.
category of maintenance).
b. Defective circuit breaker
b. Replace (refer to higher category of
maintenance).
(1) Drain valve D1
3-11. Preparing Darkroom for Travel
NOTE
(2) Drain valve D2
(3) Drain valve D3
Refer to applicable manuals listed in
appendix A for instructions covering
(4) Drain valve D4
equipment not listed below.
(5) Drain valve D5
(6) Drain valve D6
a. If required, shut off the outside water source and
remove the water hose from the water source.
(7) Drain valve D7
(8) Drain valve D10
b. Turn the water heater switch to the OFF position
(9) Drain valve D11
(10) Drain valve D 12 (petcock)
(11) Drain valve D13
c. Set all switches on control unit to the OFF
(12) Prime valve P1
position (TM 11-6740-286-12) and set circuit breaker 9
to the OFF position.
(13) Supply valve S1
(14) Supply valve S2
(15) Supply valve S3
e. To drain the water tank by using the water pump
(16) Supply valve S4
(17) Supply valve S5
(1) Close valve D2.
(18) Supply valve S6
(2) Open valves S2, S8 and S9.
(19) Supply valve S7
(3) Set the water pump switch (fig. 1-18) to
(20) Supply valve S8
the ON position.
(21) Supply valve S9
(22) Petcock (check valve drain)
(4) When the water tank is empty as
indicated by level gage (fig. 1-17) proceed to f below.
2).
h. Disconnect the power cable and water hoses
opening the valves listed below.
from the darkroom and sources, coil neatly and stow
NOTE
them. Disconnect the ground strap, remove ground rod
Normal drainage of the water system
is by gravity.
i. Empty all processing chemicals.
j. Lower the carriage assembly of the projection
printer and lock it in position.
Change 6
3-4
