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TM5-4120-384-14
4 - 3 1 . TRANSFORMER, RECTIFIER, CAPACITORS, AND
(7)  Inspect  electrical  parts  for  obvious  damage  such
as
cracks,  evidence  of  overheating,  and  broken  terminals.
(8)
Replace
all
damaged
or
broken
parts.
b.
Test.
(1)
Transformer
T1.
Do not remove jumper between
(a)  Tag  and  disconnect  leads.
pins  3  and  4  on  transformer.
Check  for  continuity  across  the
primary  winding  pin  2  to  pin  5  (on  models  F18H-3S,  F18H-3SA  and
F18H-3SB)  or  access  pins  1  and  6  on  model  F18H-1S  and  across  the
If  either  winding  is  open,
secondary  winding  pin  7  to  pin  8.
replace  transformer.
(b)  Check  for  shorts  between  one  terminal  of  each  winding
and transformer case and also between one primary terminal and one
secondary  terminal  using  an  insulation  tester,  megger  or  multimeter
Replace  transformer  if  a  short  is  indicated.
on  high  ohms  setting.
(c) (On models F18H-3S, F18H-3SA and F18H-3SB) Apply 208
Voltage  at
volts  AC  to  terminals  2  and  5  (input  terminals).
Remove
transformer  terminals  7  and  8  should  be  27  to  33  volts  AC.
Replace  defective  transformer.
power  from  transformer.
Apply  230  volts  AC  to  terminals  1
(d)  (On  model  F18H-1S)
Voltages  at  transformer  terminals  7  and  8
and  6  (input  terminals).
Remove  power  from  transformer.
should be 27 to 33 volts AC.
Replace  defective  transformer.
(2)
Rectifier
CR1.
(a)
Tag
and
disconnect
leads.
(b)  Using  a  multimeter  on  high  ohms  setting  connect
negative  (-)  lead  to  terminal  2  and  positive  (+)  lead  to  terminal
1
A  low  resistance  reading  should  be  obtained.
or  3.
(c)  Connect  positive  lead  to  terminal  2
and  negative  lead
A  very  high  resistance  or
open  circuit  reading
to  terminal  1  or  3.
should  be  obtained.
(d)  Connect  positive  lead  to  terminal  4  and  negative  lead
A  low  resistance  reading  should  be  obtained.
to
terminal  1  or  3.
(e)  Connect  negative
lead
to  terminal  4  and  positive  lead
A  very
high
resistance  or  open  circuit  reading
to  terminal  1  or  3.
should  be  obtained.
(f)
Replace
defective
rectifier.
4-89
Change 2

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