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Section IV.  Maintenance instructions - TM-55-1930-209-14P-12_51
Foghorn remote control assembly circuit test

TM-55-1930-209-14P-12 Water Purification Barges (NSN 1930-01-234-2165) Lighting System Manual
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TM 55-1930-209-14&P-12 3-17  Maintenance procedures WARNING To  prevent  electrical  shock,  open  circuit  breaker  6P14  on  24  Vdc  power  panel.    Redtag  circuit breaker  with  "WARNING  -  DO  NOT  ACTIVATE.  REPAIRS  BEING  MADE."    Also,  wear  hearing protection when servicing foghorn. NOTE Due  to  mission  and  crew  capabilities  of  this  vessel,  maintenance  normally  assigned  to  higher echelon may be assigned to the crew. 3-17.1    General  maintenance.    Perform  appropriate  general  maintenance  in  paragraph  2-18.    Clean  and  inspect electrical components as follows: a. Wipe  clean  exterior  of  electrical  component  with  clean  rag.    Vacuum  clean  or  clean  inside  with  electrician's brush.  Avoid using solvents for cleaning inside of component.  Solvents leave a greasy film on components that may reduce electrical continuity. b Visually inspect for indications of burns, corrosion, loose connections, damaged parts, or chipped paint.  Clean corrosion from contacts and terminals, tighten loose connections, and replace damaged parts.  Clean electrical contacts with silver polish, fine sandpaper, or burnishing tool.  DO NOT use emery paper or steel wool.  Vacuum to remove residue.  Touch up paint according to TB 43-014.  Do not paint threads or labels. 3-17.2   Equipment  maintenance.    Perform  foghorn  maintenance  in  accordance  with  paragraph  4.0,  Maintenance,  of manufacturer's service manual/instructions as appropriate. 3-17.3  Foghorn remote control assembly circuit test a. With  24  Vdc  power  panel  circuit  breaker  6P14  closed  (ON),  check  voltage  at  24  Vdc  inputs  to  regulator (converter assembly) for 24 Vdc (see Figure 3-2).  If voltage is not 24 Vdc, go to step b.  If voltage is 24 Vdc, go to step c. b. Check voltage at breaker 6P14 output for 24 Vdc.  If voltage is not 24 Vdc, circuit breaker or power source is at fault.  If voltage is 24 Vdc, repair or replace power cable from 6P14 to regulator cable. c. Check voltage at outputs of regulator converter for 12 Vdc.  If voltage is 12 Vdc, go to step d.  If voltage is not 12 Vdc, replace regulator converter. d. Check voltage and polarity to remote control assembly across terminal board points 6 (+) and 7 (-) for 12 Vdc.  If voltage is 12 Vdc, go to step e.  If voltage is not 12 Vdc, repair or replace power cable from regulator converter assembly 12 Vdc outputs to remote control assembly TB6 and TB7 as given in paragraph 3-17.5. e. Check voltage and polarity at regulator oscillator terminal board across point 1 (+) and 4 (-) for 12 Vdc.  If voltage is 12 Vdc, go to step f.  If voltage is not 12 Vdc, repair or replace cable from remote control assembly TB6 (+) and TB7(-) to oscillator/regulator PC assembly TB1 (+) and TB4 (-). 3-5







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