Microsoft Word - Troubleshooting

Power  Supply  (Fuse)  Repair  and  Troubleshooting  
Flowchart  


 
Description  #   Text  box   Explanation  or  Comment  
1   Begin:  Fuses   Begin  diagnostic  process  for  a  work  order  on  Fuses.  Testing  and  maintenance  is  advised  with  any  device  using  a  fuse.  
2   Test  if  the  fuse  shorts  using  voltmeter.   Use  a  voltmeter  to  assess  whether  or  not  the  fuse  shorts  (working).  
3   Does  the  fuse  short?   If  the  fuse  shorts,  the  transformer  must  not  be  functioning.  
4   Fuse  is  working  properly.  See  power  supply  flowchart  for  instructions.  


Move  on  to  the  next  step  of  the  power  supply  flowchart  if  device  still  does  not  turn  on.  Always  check  with  clinician  before  putting  a  device  back  into  clinical  use.  
5   Inspect  the  fuse  and  identify  its  amperage,  voltage,  and  type.  


Typically  the  amperage,  voltage,  and  type  is  printed  on  the  fuse  or  device  that  requires  it.  If  not,  make  an  educated  guess  by  comparing  with  fuses  of  known  specifications.  Additionally,  use  the  knowledge  of  the  device  to  estimate  which  fuse  is  best.  
6   Can  a  fuse  be  found  with  the  exact  correct  specifications?   Exact  specification  matches  may  not  be  possible  or  realistic.  
7   Replace  the  fuse  of  appropriate  type,  amperage,  and  voltage.   Simply  remove  and  replace  new  fuse  match.  




8  
Using  BTA  guidelines,  procure  a  fuse  with  as  many  specification  matches  as  possible.  Some  non-­‐matching  substitutions  can  be  made.  Refer  to  box  description  for  more  details.  


1.  Amperage:  Replace  with  lower  amperage  -­‐  will  need  to  be  replaced  more  frequently.  Do  not  replace  with  higher  amperage.  
2.  Voltage:  A  higher  voltage  can  replace  a  lower  voltage  fuse;  a  lower  voltage  fuse  cannot  replace  a  higher  voltage  fuse.  
3.  Type:  Fast  acting  fuse  can  replace  a  slow  acting  fuse  (it  will  need  to  be  replaced  more  frequently).  Slow  acting  cannot  replace  fast  acting.    


9   If  necessary,  use  BTA  skills  to  construct  a  temporary  fuse  until  the  replacement  can  be  found.   Obtain  a  suitable  fuse  that  matches  as  many  specifications  as  possible.  
Preventive  Maintenance  


• Best  to  keep  a  stock  of  frequently  use  fuses  in  the  workshop.    




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