Others - Tandy 1000 SL Technical Reference Manual

3-2-5. O t h e r s
(1) T o t a l e r r o r t e s t
I n t h e check and a d j u s t m e n t i n i t e m
3-4,
r e a d / w r i t e e r r o r t e s t i s n o t
i n c l u d e d . A f t e r t h e acFjustment o r t h e replacement o f t h e maintenance
p a r t s , it i s recommended t o perform a d a t a e r r o r t e s t by c o n n e c t i n g t h e
F D D t o t h e u s e r ' s system o r t h e TEAC s i m u l a t o r
KB.
The window margin
t e s t i s t h e most recommended +-e%-
( 2 )
Terminator
When you check e a c h F D D w i t h a maintenance system such a s an SKA, it i s
n e c e s s a r y t o p u t t h e t e r m i n a t o r network i n t o t h e
I C
s o c k e t 53 on t h e
PCBA
MFD
c o n t r o l . The t e r m i n a t o r s h a l l be r e t u r n e d t o t h e i n i t i a l
c o n d i t i o n a f t e r completion o f t h e maintenance.
For t h e f i x e d t y p e t e r m i n a t o r w i t h o u t
I C
s o c k e t ( s o l d e r e d on PCB), above
i n s t r u c t i o n i s n o t a p p l i e d .
( 3 )
Connection o f probe ground
Connect t h e probe ground o f t h e equipment a s f o l l o w s :
( a )
For o b s e r v a t i o n o f t e s t p o i n t s (TP)
4 , 5
( P r e - a m p l i f i e r ) and TPs 7 ,
8
( D i f f e r e n t i a t i o n a m p l i f i e r )
:
Connect t h e probe ground t o TP6 (OV) on t h e PCBA
MFD
c o n t r o l .
( b ) For o b s e r v a t i o n o f t h e o t h e r t e s t p o i n t s and F D D c i r c u i t s :
Connect t h e probe ground t o TP6 (OV) on t h e PCBA
MFD
c o n t r o l , o r
GND
(OV) t e r m i n a l o f t h e system power s u p p l y u n i t , o r t h e
GND
t e r m i n a l o f
t h e SKA.
is
o n - s t a t e .
The frame o f t h e F D D may be a l s o used when t h e F G s t r a p
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