Attenuator; Display Cannot Be Adjusted To Zero - Philips PM2517E Service Manual

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6.4. V: ATTENUATOR
6.4.1. Display cannot be adjusted lo zero
N o .
F r o m
M e a s u r e m e n t
l \ 4 e a s u r i n g p o i n t s
M e a s u r i n g d a t a
C o r r e c t
t n c o r r e c l
C h e c k I l h e p . c b o a r d
Open npu i
C h e c k C l 0 8
O p e n n p u t C 1 0 8 = 5 p 5 l r m r n e r
R e l e r l o C
R e p l a c e C 1 0 8
c
D i s p i a y D i s p l a y
O p e n n p u t
R a n g e 9 9 9 9 m V :
l n s u i a t e s e e c t o r s w i t c h
p a ( V :
1 / 2 w r t h a
p r e c e o f r n s u l a l r n g
m a l e r i a l . s h i l t e d u n d e f
l h e s l r d n g c o n l a c l
( R e f e r r o F i g .
)
D i s p l a y i 0 0 0 . 0 m V D e i e c t V 2 0 1
r e i € r t o O
D
c
D j s p i a y D i s p a y
C u t l r a c k f r o m R 2 0 4
r o A 1 0 2 i 1 ( 0 0 0 0 6 4 )
T h e t r a c k i s s i t u a l e d a l
t h e c o n d u c t o r s i d e
F a n g e 9 9 9 9 m V : : :
O p e n I n p u t
D L s p a y : 0 0 0 . 0 m V O e l e c t O 0 0 0 6 4
0 e l e c l V 1 0 2 .
r e p a c e V 1 0 l
6.4.2. Range 1V :-== cannot be adjusted (adj. no. 3, 4, 5.)
N o .
F r o m M e a s u r e m e n t
M e 3 s u r i n g p o i n t s
l / e a s u r i n g d a t a C o r r e c t t n c o r r e c l
D i s p a y
F e f e r t o A d t n o 3 . 4 . 5
C h e c k ;
R 2 0 4 = 4 7 k p o t m e l e r
T r a c k i n t e r r u p t r o n s
C 2 0 1 = 1 0 n F I
s h o r l
C 2 0 2 = 3 3 n F t c l r c u I
R 2 0 1 = 4 M 2 | l n l e ' .
R 2 0 2 = 4 M 2 f r u p t i o n
a
I n s t r u m e n t s l a y s o n
tl
D r s p l a y
r e l e r t o A d t . n o . 3 , 4 . 5 C h € c k i
R2O1 - 4M2
R2A2 = 4M2
F 1 0 8 = 1 M
R 1 0 9 = l M
6.4.3. Range lov -_-- and l00V ===
cannol be adjusted (adj. no. 6, 7)
N o . From l\4easurement l ' / e a s u r i n g p o i n t s
M e a s u r i n g d a t a C o r r e c t
t n c o r r e c l
R a n g € d e v i a t o s
w i t h a l a c l o r o l 1 0 0
R205. R206, R207
and R208
R205 = 9k09
R 2 0 6 = 1 M
R 2 0 7 = 1 0 0 a p o l . m e t e r
R 2 0 8 = 8 2 0 k
R e f e r t o B
C h e c k : R 2 0 5 , R 2 0 6
R 2 0 7 a n d R 2 0 8
a
C h e c k i
T r a c k n t e r r u p t i o n s
S e e c t o r s w i t c h ( c l € a n l )
R e f e r t o C R e p a r
c
B
R on v201
Range 10V -:
H i = V 2 0 1 d r a i n
Lo = V201 source
9-meter
< 6 0 Q T r a c k i n t e r r u P t r o n E e l e r l o D
D
c
G a l e v o i l a g e V 2 0 1
R a n g e 1 0 V :
H i = g a t e V 2 0 1 OV D e f e c l V 2 0 1 R e l e r t o E
E
o
s t h e d e c i m a l p o r n l i n C h e c k r a n g r n g
c o u n l e r O O 0 0 5 9