Pioneer SK-700 Service Manual page 18

5.
5 . 1
A DJU S TM E N T
C H E C K P O I N T S O F C A S S E T T E M E C H A N I S M
I
T a p e s p e e d d e v i a t i o n :
3 , 0 0 0 1 7 5 H z
( 4 . 7 6 c m / s ! 2 . 5 % \
I
W o w a n d f l u t t e r :
L e s s t h a n 0 . 2 5 % ( R M S )
L e s s t h a n 0 . 0 9 % ( W R M S )
U s i n g a n S T D - 3 0 1 A , m e a s u r e t h e
wow and flutter at the start and end of
w i n d i n g a n d t a k e t h e m a x i m u m v a l u e .
l f v a l u e s i n d i c a t e d b y t h e p o i n t e r v a r y
c o n s i d e r a b l y , a d j u s t t o 7 0 % o f t h e
m i n i m u m a n d m a x i m u m v a l u e s .
M e a s u r i n g t i m e s h a l l b e 5 -
6
s e c o n o s .
Conf irm the following
replacing parts of
mechanism.
items when
the cassette
U s i n g a n S T D - 3 0 1 A , m e a s u r e t h e
; s p e e d a t t h e s t a r t a n d e n d o f w i n d i n g
a n d t a k e t h e m a x i m u m v a l u e . M e a s u r e -
i n g t i m e s h a l l b e 5 - 6 s e c o n d s .
r
F . F . t o r q u e :
Less than 130 seconds
Using an C-60, set to fast forward and
r e w i n d , a n d m e a s u r e t h e t i m e w i t h a
stop watch.
38 ." 58 g.cm
l l z - - \ , ^ l l
| /a\\ /aa\ |
1 ; 1 \ - u / \ \ _ / / |
l l v
\ - /
|
t r - ) l
Using a cassette type torque meter
( 1 2 0 g . c m ) , m e a s u r e t h e m i n i m u m
v a l u e w h i l e i n t h e p l a y m o d e . M e a s u r -
i n g t i m e s h a l l b e 5 - 6 s e c o n d s .
Using a cassette type torque meter
( 1 6 0 g . c m ) , m e a s u r e t h e v a l u e w h e n
t h e t a p e s t o p s i n t h e F . F . m o d e .
r
R E W t o r q u e : r
B a c k t e n s i o n t o r q u e :
I
P i n c h r o l l e r p r e s s u r e :
85 -
150 g.cm
| /---\ ,^ ll
i r(')) r.)) |
| \ v / \ v / I
I
v
I
t . / t s \ I
2 - 5 g . c m
r=:)
ll /'-\ /'--\ ll
I r f ) ) r - ) t l
| \ v , / \ \ _ / , / t l
l v
: _ ; l l
t , / = = _ - l
23O -
29Og
t-)
/ 1 T - _
{ l l o i . ( u ( l -
l O +
\i7
Using a cassette type torque meter
( 1 6 0 g . c m ) , m e a s u r e t h e v a l u e w h e n
t h e t a p e s t o p s i n t h e R E W m o d e .
A f t e r s e t t i n g i n t h e R E W m o d e w i h t o u t
l o a d i n g a c a s s e t t e t a p e f o r 5 m i n u t e s ,
m e a s u r e t h e b a c k t e n s i o n t o r q u e i n t h e
play mode, using a cassette type tor-
o u e m e t e r .
M e a s u r e t h e p r e s s u r e w i t h a t e n s i o n
m e t e r ( 1 k g ) a t t h e p o i n t w h e r e t h e
rotor stops rotating at the c'enter of
t h e o i n c h r o l l e r .
Clearance between f lvwheel and
f l y w h e e l b r a c k e t :
F a s t f o r w a r d a n d r e w i n d i n q t i m e :
8 5 -
1 5 0 g . c m
0.05 -
0.25 mm