No Or Incorrect Power - Philips PM2517E Service Manual

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6 9
6.1. POWER SUPPLY
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6.1.1. No or incorrect power
N o .
From M e a s u r e m e n t N 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 Correct
t n c o r r e c t
S u p p l y v o l t a g e + a n -
(across C804, C802)
Hi = C804 (+ )
H i = c 8 0 2
( _ )
Lo= o-socket +
+ 8 V . . . . + 9 V
- 8 V . . . . r g v
Power supply okay E o t h 1 n c o f i e c l ,
R e t e r l o B -
R e l e r t o H
R i p p l e o n t h e s u p p l y
v o l t a g e + a n d -
H i = c 8 0 4
( + )
H i = c 8 0 2
, ( - )
Wilh oscilloscope
< 1 0 m v Reler to c
F e l e r l o E
c .
B
T o o h i g h o r l o o l o w
s u p p r y v o r l a g e
H i - c 8 0 4 ( + )
H = C 8 0 2 . ( - )
Lo = o'sockel +
> + 9 V < + 8 V
> - 9 V < - 8 V
> Reter to D
D,
c
Convertor frequency
(Supply voltage
> + 9 V , > - g V )
H i = C o l l V 8 0 2
Lo = o-socket +
Wrlh oscllloscope
Vary the battery
voltage belween
6 and 9V ext.
C h a n g i n g o t f r e q u e n c y
N o r m a l a l 9 V e x l o f
6V batt
= 1 6 0 k H z
- 9 V
When varying Vball.
lhe trequency should
change
V 8 5 0 d e l e c l V 8 0 1 d e t e c t
o r R 8 0 2 l o s m a l l
(560k4)
B
Ripple on supp y
voltage >10mV
H i = C 8 0 4 ( + )
Lo = o-sockel ü
W i l h o s c i l l o s c o p e
5 0 H z
8 0 . . . . 1 0 0 k H z
4 H z
1 0 0 H z
D e l e c t n p o w e r s u p p l y
D e l e c t n c o n t r o l
c l o c k , r e f e r t o 6 . 5 .
D e l e c t r n A Z s i g n a l
r e l e r t o 6 . 5 .
O e l e c l i n d i s p l a y
c o n t r o l , r e f e r t o 6 . 5 .
c
C o n v e r l o r f r e q u e f l c y
( S u p p l y v o l t a g e
< + 8 V , < - 8 V
H i = C 8 0 4
,
( + )
W i i h o s c i l l o s c o p e
Vary ihe batlery
v o l t a g e b e l w e e n
6 a n d 9 V e x t .
C h a n g l n g o l l r e q u e n c y
N o r m a l a t 9 V e x l o r
6 V b a t t
n n *9v
-fttr
= 1 6 0 k H z
- " - g v
W h e n v a r y i n g V b a t l .
s h o u l d c h a n g e
Delect V850 Reter to G
G . Voiiage over R803/804
R803 or R804
R 8 0 3 : 1 6 5 m V - - a 2 5 %
R 8 0 4 = 2 6 5 m V : ! 2 5 %
T o o s m a l l :
C h e c k ; R 8 0 1 , V 8 5 2 ,
V 8 0 1 o r
T r a c k i n t e ( u p t i o n
Too lar96:
i h e L n s t r u m e n t .
e . g . O n e L E D l i g h t s
+ V sripply not present
- V SUPPJY
=Vball
H i = c 8 0 4
( + )
H i = c 8 0 2
( - )
Lo = O.socket +
+ V supply nol presenl
- V suPPlY :Vbatt
Converlor s nol
running.
Check; R802 v802
and T801