Tandy 1400LT Service Manual page 138

1
MOTOR ENA (5. 25) s i g n a l
l e v e l m e a s u r e d a t P i n 6 0
o f GATE5 m u s t b e High.
D R I V SELO (5. 25) s i g n a l
l e v e l
m e a s u r e d a t P i n 6 2
o f GATE5
must b e High.
I
I
FDD u n i t rep1acement.l
I
I
C95, C 9 6 , C97
R71-R73
Check t h e
c o n s t a n t
of IC57.
a r e n o t
p r o p e r .
Check f o r
a Low
P u l s e a t P i n 4 of
pPD72065 (IC54)
(CS765 s i g n a l )
5-29