Tandy 1400LT Service Manual page 112

0
Will Not Start
YES
Q
Check IC2, CTL1, R78,
R80, C2, a n d C 3
Check t h e r e l a y t r i p s
when t h e power ON
s w i t c h i s p r e s s e d
Check
Power
S w i t c h
(SW500) o n t h e r i g h t
s i d e
of
u n i t
Check t h e Low B a t t e r y
R E D LED when t h e
C h a r g e t h e b a t t e r y
Check
Low
p u l s e a v a i l a b l e
a t
p i n 11
of
I C 2
when t h e Power ON
s w i t c h is p r e s s e d .
I
Check IC2, D 1 ,
R 1 , a n d C 1
Check 4.
77MHz
( 7 . 16MHz: When h i g h
s p e e d mode)
C l o c k
s i g n a l
o u t p u t
p i n 8 of IC2
5-3