Tandy 1400LT - Page 128

Check WRITE
GATE/
signal (Pin4
of IC56)
Check
IC54
and IC56
Perform a READ operation.
I
Check Pin24 of CNlO
{Read data from FDD)
1
Check the FDD unit
and the connection
Check
DRQ signal cable.
,(Pin14
of IC54)
I
Is a high signal fed
to 82C37 (IC18) RESET
When the
Main SW is
set to ON?
0
Check IC10
and
IC2
Is a clock signal fed to
CLK of 82C37
Pin12
of IC18. 4.77MHz
Check IC2
5-19