TM 11-6780-225-35
Item
Trouble symptom
Probable trouble
Corrective measure
No .
d
Pump supply valve (S1) is closed
d
Open valve (SI).
e
No output from water pump
e
Pump has lost prime or is not
operating. Reprime pump or
repair.
f
Pump drain valve (D6) is open
f
Close valve (D6).
g
Petcock check valve drain is
g
Close petcock.
open.
2
No cold water when faucet (S7) is
Filter completely clogged
Clean or replace filter.
turned on with pressure read or
INLET indicator but no pressure
on OUTLET indicator.
3
No water when hot water faucet
Water heater drain valve D4 is open
Close valve D4 from water heater.
S6 is turned on.
4
No hot water when hot water faucet
a
No power to electric water
a
Check electrical supply to water
S6 is turned on
heater
heater.
b
Water heater defective
b Repair or replace water heater.
5
Large compartment water bath
Defective temperature control unit
Troubleshoot temperature control unit
temperature does not stabilize at
as recommended in TM 11-6740-
desired setting
286-35.
6
Water does not drain properly from
Kinked water drain connection
Straighten or replace water drain hose.
processing sink.
3-7.
Direct and General Support Heater and Film and Print Drying Cabinets Troubleshooting Chart
Item
Trouble symptom
Probable trouble
Corrective measure
No.
1
No heat emanating from the space
a
Heater control panel HEATER
a
Set switch to HEATER.
heater with low darkroom or space
OFF-FAN switch to OFF.
heater thermostat settings
b
Blown or missing heater fuse
b
Replace fuse of required rating in
heater control panel.
c
Defective space heater thermostat
c
Clean or replace thermostat.
d
Defective darkroom heating
d
Clean or replace thermostat.
thermostat.
e
Space heater does not function
e
Troubleshoot space heater as rec-
ommended in TM 5-9163.
2
Heat from space heater, but no heat
Air control lever closed-
Open air control lever.
in film and print drying cabinets.
3
Exhaust fans do not operate
a
Control panel FILM and PRINT
a
Place respective switch in AUTO
DRIER switches are in OFF
or MAN position as required.
position.
b
Blown or missing film and print
b
Replace fuses of required rating
drier motor fuses
as required.
c
Defective film and print processing
c
Clean or replace the defective
thermostats
thermostat.
Section III.REPAIR
lined in chapters 4 and 5 as required to isolate a
3-8.
Considerations Before Disassembly of
defective component.
Do not disassemble any
Darkroom
components unless repair or replacement is indicated
after performing the troubleshooting procedure described
Isolating trouble in the darkroom (para 3-4) can simplify
in paragraph 3-4. Disassemble the darkroom only to the
repairs by limiting the work to the defective area.
extent required necessary for repair or replacement,
Repairs that can be made by disassembly of the
repair or replace the defective part or parts and then
particular parts that operate as a group to perform a
assemble the darkroom.
function are outlined in the paragraphs below. Perform
the
testing
procedure
out
3-4
