Tandy 1400LT Service Manual page 131

Check IC46 and IC48
( m , m ,
and DSRlZ signal)
I
I
Check the transmission
data (TXD)
Pin
11
of IC35.
1
Check GATE3 and IC47
TXD,TXDlBA and TXDlZ signal
r
-
1
Check IC35,GATE3 and IC47
(m,
RTS12A and RTSl2 signal)
Check SOAINT signal
Pin30 of IC35.
. .
1
I
Check IC35.1
r
I
1
Check the reception
data (RXD12)
I
Check the connectors
and cable for RS-232C
5-22