Tandy 1000 SL Technical Reference Manual page 476

(B-2) Check and adjustment procedure (Conventional
SKA
method)
(1) Connect an SKA and check c a b l e r e f e r r i n g t o item 3-2-4
and set t h e
F D
P U R switch t o t h e PSA s i d e .
( 2 ) Use
two
channels
of
o s c i l l o s c o p e and connect them a s follows:
( a ) The 1st channel:
SKA DOUT t e r m i n a l
(b) The 2nd channel: TP3 (Track
00
s e n s o r ) on PCBA
MFD
c o n t r o l ,
2 V range
( c ) E x t e r n a l t r i g g e r : DIRECTION SELECT i n t e r f a c e s i g n a l ( I n t e r f a c e
connector p i n No.18) o r p i n 3 o f 53 ( r e s i s t o r
network
RA1
f o r t e r m i n a t o r ) on t h e
PCBA
M F D
c o n t r o l ,
(+)
t r i g g e r .
( 3 ) Key i n "B8 F". (STEP o b s e r v a t i o n )
( 4 ) I n s t a l l a work d i s k and s t a r t t h e s p i n d l e motor by key "5".
(MON
i n d i c a t o r t u r n s o n ) .
(5) Execute d r i v e select by key
"0".
(DSO i n d i c a t o r t u r n s o n ) .
( 6 ) S e t t h e s t e p r a t e and t h e s e t t l i n g
t i m e
a s f o l l o w s r e f e r r i n g t o
i t e m
3-2-4-3.
FD-55BR, 6msec seek model: S t e p r a t e limsec, S e t t l i n g t i m e
lsmsec
FD-55BR, 4msec seek model: S t e p
rate
4msec, S e t t l i n g
time lOmsec
FD-55FFUGR: S t e p r a t e 3moec, S e t t l i n g t i m e 15msec
(7) Key i n "CO" and confirm t h a t t h e T R A C K i n d i c a t o r becomes
"00".
(
RECALIBRATE)
( 8 ) Key i n "CS".
(TOO
TIMING)
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