Tektronix 2236, Инструкция по эксплуатации

Страница: 318 / 350

GENERAL NOTES
A . U s e s c h e m a t i c d i a g r a m s , T h e o v e r a l l b l o c k
d i a g r a m , c i r c u i t b o a r d i l l u s t r a t i o n s , a n d
c i r c u i t d e s c r i p t i o n s w h e n a n a l y z i n g i n s t r u m e n t
m a l f u n c t i o n s a n d l o c a t i n g t e s t p o i n t s . T h e
s c h e m a t i c d i a g r a m s i n c l u d e t y p i c a l w a v e f o r m s
a n d v o l t a g e s t h a t a r e i n t e n d e d o s a n a i d
i n t r o u b l e s h o o t i n g .
B . A l w a y s s e t t h e POWER s w i t c h t o OFF a n d u n p l u g
t h e l i n e c o r d b e f o r e s w o p p i n g , r e m o v i n g , o r
r e p l a c i n g c o m p o n e n t s , a n d b e f o r e c o n n e c t i n g o r
d i s c o n n e c t i n g i n s t r u m e n t l e a d s a n d c o b l e s .
C . When a n a l y z i n g c i r c u i t m a l f u n c t i o n s , c o n s i d e r
c o n n e c t o r s a n d c a b l e s a s p o s s i b l e c a u s e s o f
f a i l u r e .
SPECIFIC NOTES
1 . S e t i n i t i a l f r o n t - p a n e l c o n t r o l s a s f o l l o w s ;
POWER S w i t c h
A I N T E N S I T Y
FOCUS
V e r t i c a l P O S I T I O N
V E R T I C A L MODE
CH 1 V O L T S / D I V
CH 1 V O L T S / D I V V a r i a b l e
CH I A C -G N D -D C
H o r i z o n t a l P O S I T I O N
H O R IZ O N T A L MODE
A S E C / D I V
A S E C / D I V V a r i a b l e
X 10 M o g n 1 f i e r
A TRI G GE R M o de
A&B I NT
A SOURCE
ON ( b u t t o n i n )
M i d r a n g e
M i d r a n g e
M i d r a n g e
CH 1
0 . 1 V
C a l d e t e n t
GND
M i d r a n g e
A
0 . 1 m s
C a l d e t e n t
O f f ( k n o b i n )
P - P AUTO
VERT MODE
I NT
2 . V e r i f y t h e l o w - v o l t a g e p o w e r s u p p l i e s a t t h e
f o l l o w i n g t e s t p o i n t s .
SUPPLY TEST POINT TOLERANCE
+ 5.0V W968 4.85 to 5.15V
+ 8.6V W960 8.43 to 8.77V
-8.6V
TP961
-8.56 to -8.64V
+ 30V W956 29.1 to 30.9V
+ 100V W954 97 to 103V
NOTE
A HV p r o b e i s r e q u i r e d t o m e a s u r e t h e - 2 k V s u p p l y .
T u r n o f f t h e p o w e r a n d m o k e t h e t e s t e q u i p m e n t
c o n n e c t i o n s t o t h e o s c i l l o s c o p e . S e t t h e v o l t m e t e r
t o r e a d a t l e a s t - 3 k V , t h e n t u r n t h e o s c i l l o s c o p e
p o w e r b a c k o n t o t a k e t h e r e a d i n g . A f t e r o b t a i n i n g
t h e r e a d i n g , t u r n o f f t h e o s c i l l o s c o p e p o w e r t o
d i s c o n n e c t t h e t e s t e q u i p m e n t c o n n e c t i o n s , a n d
r e p l a c e t h e c r t s o c k e t c o v e r .
V e r i f y t h e - 2 k V s u p p l y a t p i n 2 o f t h e c r t s o c k e t .
T h e v o l t a g e s h o u l d b e b e t w e e n - 1 9 0 0 a n d - 2 1 0 0 V .
3.
WARNING
The Preregulotor and Inverter circuits hove o flooring
common reference with respect to chossls ground.
Ac-source potentiol is present on the common reference
points. Connect the instrument to the oc-power source
through on isolation transformer to prevent the pos­
sibility of personal injury or equipment domoge when
troubleshooting these circuits.
YES
* NUMBER IN D I C A T E S
S C HEM AT IC DIAGRAM
REV JAN 1985