Display Constant - Philips PM2517E Service Manual

12
6.3- ADC
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6 . 3 . 1 . D i s p l a y c o n s l a n t 0 O O O
N o .
F r o m
l , 4 e a s u r e m e n t
l M 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
I n c o r r e c t
I n P u l s i g n a l s u p p r e d
d r r e c t l y t o A D c
D i s p l a y
I n p u t v o l t a g e ;
b i 9 0 m V
c. r 900fiV
S u p p l i e c l t o i A D C
H i = R 1 0 8
n q h l h a n d s r d e
R a n g e i a . b . 9 9 9 9 m V
c . I 9 9 g v
a. 10000 mV
b. t 90.00 mV
c a 9.000 V
R e l e r t o B
I
D a t a s r g n a O O 0 0 5 9
( D 1 0 1 )
H i = D 1 0 l / 1 4
L o = 0 s o c k e t +
W i t h o s c r l l o s c o p e
I n p u l v o l l a g e i + 9 0 ' n V
s u p p i e d t o A D C
a . A s S y m e l f i c a l b l o c k
v o r a q e
b . S y m e l f i c a b l o c k
v o r a g e
c N o s g n a l
a . R e f e r t o C
c
B
D a l a h o d D H o o 0 0 5 9
( D r 0 1 )
t - t = D 1 0 1 i 1 8
L o g c 0 ( - 8 5 V )
F e f e r t o D
D
c
D a t a h o l d D H O O 0 0 5 5
( D 7 0 3 )
H r = D 7 0 3 / 1
L o q i c 0 l - I 5 V )
R e l e r l o E
D e i e c t O 0 0 0 5 5
r n D H l r n e
E
D
D a l a h o l d D H O O 0 0 5 9
( D 1 0 1 )
C o n n e c t D r 0 1 / 1 8
t o - 8 . 5 V ( C 8 0 2 -
)
a I n s t r u r n e n l I u n c l r o n s
a q a n
E l r o r s t i l l n b
a . T r a c k I n t e r r u p t r o n
n D H l i n e
b D e l e c l O O 0 0 5 9
C A u t o z e r o A Z O Q 0 0 5 9
( D r 0 1 )
H i = 0 1 0 1 / 1 5 A Z
H l = 0 1 0 1 i 1 6 A Z
W r l h o s c o s c o p e
2 0 0 m s e c
az j-l-J
o-
e.sv
A Z L J
|
8 5 V
R e l e r l o G
D e i e c r O O 0 0 5 9
G A U I O Z E T o A Z o n F E T
v 1 o 2 / v r 0 2 I
H = q a t e v t 0 l / v 1 0 1
W l h o s c r l l o s c o p e
I n P u t v o l l a g e ; s u p p l r e d
l o A D C + 9 0 m V a n d
+ 9 0 0 m V . r e f e r t o A
2 0 0 m s e c
az l-l_l G or B
0
a 9 0 m V n r a n g e
9 9 . 9 9 m V
b . 9 0 0 m V r n . a n g e
9 999V
D e l e c i O 0 0 0 5 9
C h e c k R 5 0 4
C t r e c k t r a c k s
r E T v t o r t t o r l
H I
C o n v e r s o n r e s i s t o r s
R a a n d F b o l
0 0 0 0 6 4 ( A 1 0 2 )
a . 4 1 4 2 1 4 t 1 1
b . 4 1 0 2 i 9 / 6
b : 1 0 k 4
D e f e c l O Q 0 0 6 0
( 4 1 0 1 )
D e l e c l r e s L S l o r s
B T r a c k A 1 0 l / 1 5 l o
D 1 0 1 / 1 4
4 1 0 1 / 1 5 - D 1 0 t / 1 4
S h o r t c r c u r l t o
o r - 8 . 5 V s u p p l y
S h o r t c l r c ! ] r l
l n p u r o f A D c
S w i l c h r n g p a r t
000060 (ar0r)
H i - A l 0 l i 1 2
L o = + 8 . 5 V
( C 8 0 4
+
)
- 2 6 V . . - 3 . 2 V
B o t h s r g n a l s
shou d be equal
D e f e c l O Q 0 0 6 0
J
Data outpul 000060
( 4 r 0 1 )
H i = 4 1 0 1 / 1 5
W i l h o s c i l l o s c o p e
L o a d A l 0 1 / 1 5 w r l h
T h e m u l t i m e t e r s h o u l d
a r a n q e ( P M 2 5 0 3 )
T h e m e a s u r e m e n t s
w i i h l h e r n u l t i m e t e r
t h e d a t a s l g n a
D e f e c t O O 0 0 6 0
L
S o u r c e v o l t a g e o i
FEr v fi2t1o21
Hi = Al02/5 (Vt 02)
H i = a r 0 2 / i o ( v t o 2 1 )
Lo = o.sockel ü
+ 0 . 4 V . . . + 3 V
Eolh slgnals sholr ld
D e f e c t 0 0 0 0 6 4
D e l e c l O 0 0 0 6 a
- V s o L r r c e : V d r a r n
D e l e c t V 1 0 2 / 1 0 2 1