The Supply Turntable Assembly; The Tape Tight Tension; The Supply Pulley Disc With The Clutch Lever - TANDBERG 12 Service Manual

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4.2.1 The supply turntable assembly
The supply turntable assembly is put together by first
i n s e r t i n g t h e h e l i c a l c o m p r e s s i o n s p r i n g ( 6 1 . 7 ) a n d t h e
p u l l e y d i s c ( 6 . | . 2 ) o v e r t h e h o u s i n g ( 6 5 . 3 ) . M a k e s u r e
t h a f t h e c o m p r e s s i o n s p r i n g ( 6 i . 7 ) f i t s i n t o t h e s y l i n -
d r i c a l g r o o v e i n t h e c a r t r i d g e ( 6 . | . . l 1 ) . T h e t w o d e l r i n
l u g s a n d t h e t o n g u e o n t h e c a r t r i d g e ( 6 1 . 1 1 ) s h o u l d
l i e o n a l i n e p e r p e n d i c u l a r t o t h e f r o n t e d g e o f t h e
u p p e r m o u n t i n g p l a t e ( 7 1 . 2 ) , w i t h t h e d e l r i n t o n g u e
p o i n t i n g t o w a r d s t h e f r o n t . P r e s s d o w n t h e p u l l e y
d i s c ( 6 1 . 2 ) u n f i l t h e d e l r i n l u g s o n t h e c a r t r i d g e ( 6 l . l l )
have passed through the notch in the clutch lever
( 5 9 . 6 ) . T u r n t h e c a r t r i d g e ( 6 1 . 1 l ) 9 0 o c o u n t e r c l o c k -
w i s e . M a k e s u r e t h a t t h e t w o d e l r i n l u g s h a v e b e e n
locked in position by the claws on the clutch lever
( 5 9 . 6 ) , a n d t h a t t h e t o n g u e o n t h e c a r t r i d g e ( 6 l . l l )
fits into the groove in the clutch lever (59.6). Ref. fig.
1 3 a n d 1 4 .
l n s e r t t h e f l a n g e f o r t h e t u r n t a b l e h o u s i n g ( 7 2 . 2 ) b y
p r e s s i n g i t i n t o t h e u p p e r e n d o f t h e h o u s i n g ( 6 5 . 3 ) .
P l a c e t h e m y l a r s h e e t ( 6 1 . 4 ) o n t h e t o p o f t h e p u l l e y
d i s c ( 6 1 . 2 ) , a n d i n s e r t t h e t w o s p r i n g s ( 6 1 . 9 ) i n t h e
w e l l s . A t t a c h t h e t a p e t i g h t d i s c ( 6 1 . 6 ) w i t h t h e s h o r t
p i n s i n s i d e t h e t w o s p r i n g s ( 6 1 . 9 ) a n d i n s e r t t h e t u r n -
t a b l e ( 6 5 . 2 ) . R e f . f i g . 1 5 .
Move ihe operating lever (54.'l ) to the fast wind posi-
t i o n . T h i s w i l l a l l o w t h e s u p p l y t u r n t a b l e ( 6 5 . 2 ) r o r e s t
o n t h e f l a n g e ( 7 2 . 2 ) . I n s e r t o n e t e f l o n w a s h e r ( M 3 5 5 )
o n t h e t u r n t a b l e s h a f t , u n d e r t h e l o w e r m o u n t i n g
p l a t e ( 7 1 . 1 ) , b e f o r e t h e d e l r i n n u t ( 6 5 . 5 ) i s a t t a c h e d .
A s c e r t a i n a n a x i a l p l a y i n t h e t u r n t a b l e s h a f t o f a p p r o x .
0 . 1 m m ( . 0 t " 1 .
F i g . 1 5 . T h e s u p p l y p u l l e y d i s c w i r h r h e m y l o r s h e e r .
4.2.2 The tape tight tension
A s l i g h t p e r m a n e n t c l o c k w i s e t o r q u e o f t h e s u p p l y
furntable (65.2) has been introduced to prevent a tape
loop from being formed between the supply turn-
t a b l e ( 6 5 . 2 ) a n d t h e t r i m c o v e r s ( 7 3 . 1 , 7 3 . 2 ) w h e n r h e
o p e r a t i n g l e v e r i s i n n o r m a l f o r w a r d d r i v e , a n d t h e
sfarf-stop lever is operated. The tape tight disc (61.6)
i s a s p r i n g l o a d e d f r i c t i o n d i s c t h a t p r e s s e s a g a i n s t a
g r e e n f e l t w a s h e r u n d e r n e a t h t h e s u p p l y t u r n t a b l e
( 6 5 . 2 ) , r e f . f i g . 1 3 .
Adiustments
The adiustment is made by stretching or cutting the
t w o s p r i n g s ( 6 1 . 9 ) . T h e t o r q u e s h o u l d b e i u s t s u f f i -
cient to take up the loop formed when the operating
lever is in normal forward drive, and the tape recorder
stopped by ihe momenlary start-stop lever. The tape
recorder should be loaded with a full 7" tape reel on
t h e s u p p l y t u r n t a b l e ( 6 5 . 2 ) .
Nofe: Do not increase this torque unnecessarily, as
excessive torque might introduce wow and
fl utter.
a
F i g . 1 4 . T h e s u p p l y p u l l e y d i s c w i i h t h e c l u t c h l e v e r .
1 3