Thermo Electron Ramsey ORETRONIC III, Operating And Service Manual

Page: 88 / 143

ORET RONIC
™
Tramp Metal Detector
R E C 4 1 0 5 4 - 2 0
4.5.3.1 Testing the Transmitter Coil
F o llo w th i s p ro c ed u r e t o t e s t th e t r a n s mi t t e r c o i l i f y o u r sy st e m d o e s n o t
h a v e a j u n ct i o n b o x .
1 . T u rn o ff p o w e r t o th e c o n t ro l u n i t ( S W6 ).
2 . D i s c o n n e ct th e tr a n s mi t t e r co i l wi r e s fr o m fi e l d t er mi n a l s 4 an d
5
3 . M e a s u r e t h e r e s i s t an ce o f t h e co i l .
I f t h e o h m me t e r d o e s n o t s h o w 2 – 3 o h ms , t h e t r an s mi t t e r c o i l
i s b a d .
I f th e t r an smi t t e r c o i l r e s i s t an c e is a p p ro x i ma t e ly 2 – 3 o h ms , t h e
t r a n s mi t t e r c o i l , it i s w i r in g , an d i t s p o rt io n o f th e
C P U
b o a r d i s
a l l r i g h t . C h e c k t h e r e c e i v er co i l .
I f y o u r sy st e m u s e s a j u n c t i o n b o x , f o l lo w t h i s p r o c ed u r e t o t e st t h e t r an s -
mi t t e r c o i l.
1 . T u rn o ff p o w e r t o th e c o n t ro l u n i t (
S W
6 ) .
2 . D i s c o n n e ct th e tr a n s mi t t e r co i l wi r e s fr o m fi e l d t er mi n a l s 4 an d
5 .
3 . M e a s u r e t h e r e s i s t an ce o f t h e co i l .
I f th e t r an smi t t e r c o i l r e s i s t an c e is a p p ro x i ma t e ly 2 – 3 o h ms , t h e
t r a n s mi t t e r c o i l , it i s w i r in g , an d i t s p o rt io n o f th e
C P U
b o a r d i s
a l l r i g h t . C h e c k t h e r e c e i v er co i l .
4 . I f t h e o h m me t e r d o e s n o t s h o w 2 – 3 o h ms o n t h e t r an smi t t e r
c o i l w i r e s , me a s u r e t e r mi n a l s 2 4 a n d 2 5 a t t h e j u n c t i o n b o x .
I f 2 4 – 2 5 a t t h e j u n c t i o n b o x a r e 2 – 3 o h m s , t h e c a b l e f r o m t h e
j u n c ti o n b o x t o th e co n t ro l u n i t is b ad .
4.5.3.2 Testing the Receiver Coil
F o l l o w t h i s p r o c ed u r e t o t e s t t h e re c e i v er co i l i f y o u r sy s t e m d o e s n o t
h a v e a j u n ct i o n b o x .
1 . T u rn o ff p o w e r t o th e c o n t ro l u n i t (
S W
6 ) .
2 . D i s c o n n e ct t h e r e c ei v e r c o i l w ir e s f r o m f i el d t e r mi n a l s 1 a n d 2 .
3 . M e a s u r e t h e r e s i s t an ce o f t h e co i l .
I f t h e r e s i st a n c e i s g r e a t e r t h an 5 0 0 o h ms , t h e r e c e i v er c o i l i s
b a d .
I f t h e r e c e i v e r co i l r e si s t a n c e i s ap p r o x i ma t e l y 4 5 0 – 5 0 0 o h ms ,
t h e r e c e i v er c o i l , i t i s w i r in g , an d i t s p o r t i o n o f t h e
C P U
b o a r d
i s a ll rig h t .