PROBLEM: System printer on remote sat does not work.
TESTING: Have you ever fought a 7400a data module and no matter
what you did everything looked correct?
1> You check options. (They're correct.)
2> You check options on peripheral. (OK)
3> You can even see the receive data light blink.
SOLUTION: There are two methods for shooting this trouble.
1> You can put a break out box on the 7400a data
module and you will see all the leads are in a low
state, none of them will be high. This indicates
that wrong power unit is plugged into the 7400a
data module.
2> The easiest way to verify the right power unit is
plugged in is the 7400a will only work on the
WP90110-L7 power unit and it will be stamped on the
power unit.
WP90110-L7
CLASS 2 Power Unit
INPUT: 117 VAC, 60 cycles, 20 watts
OUTPUT: +5 VDC 1.5A
+12 VDC .10A
-12 VDC .10A
COMCODE: 405-509-852
3> The mix up usually happens when there is a 7400b
and a 7400a. The 7400b will work on either power
unit, but the proper power unit for the 7400b is
the WP91508-L5.
SP901508-L5
CLASS 2 Power Unit
INPUT: 117 VAC, 60 cycles, 20 watts
OUTPUT: +5 VDC 1.2A
COMCODE: 405-967-696
7400A User's Manual 555-020-706
* DCE Card facing to front of 7400A
7400A OPTIONS: FOR BCMS PRINTER
300 off }
1200 off }
2400 off } only set one speed to on that matches
4800 off } printer speed
9600 on }
19200 off }
SET answer auto
break disc long
ci on off
ch off
cts normal
dcd normal
dsr normal
dtr 10 msec 50 msec
dtr det ignore
ll off
parity even
remote loop deny grant
ri on
rl off
sig disc on
tm on off
SET INTERFACE answer only