Teletype 43 Teleprinter Basic RO, Service Manual

Page: 159 / 222

MANUAL
406,4-3
2. (Pedestal Based)
YES NO
Is LED 2 lit on the IXL cir-
(Top) Go to 2. Go to 1a.
cuit card? (power cord to (1)
0
controller and
KP
set
(2)
•
plugged in and power avail-
(3)
o
able, KP switch on)
1a. Disconnect controller cable
Go to 1c.
from power supply and measure
at power supply for+ 12V de, -12V de
and +5V de.
Are any voltages present?
1c Are all voltages
present?
1d. Reconnect the controller
cable to the power supply.
remove
all circuit cards from
controller. Measure the voltages
at the cable connection to
the controller.
Are all voltages present?
Go to 1d.
Go to 1e.
1e. Replace the controller
circuit cards one at a
time measuring the voltages
at the con troller after
each card.
Are all voltages present?
2. Does controller pass
self-test? (See Page
4-4
for
for self-test)
Replace IXL card
if LED 2 is not
lit.
If LED 2 on IXL card
is lit, check for intermit­
tent short or open.
Refer to Teleprinter
Troubleshooting
Page 1-29 for further
analysis.
Check AC cord connection.
Check fuse
F4
and replace
if blown. Replace power supply
if fuse blows again.
Replace power supply.
Replace power supply.
Check continuity of
cable. Replace if bad.
Replace back panel.
--
-
-- -- --
-
Replace circuit card
that caused voltage to
change.
Replace defective circuit card
indicated by self-test.