SATURN
EPABX
Installation Test Procedures
Issue 1, May 1986
Power-Up/Output
Test (Continued)
S T E P
PROCEDURE
IF VERIFICATION
IS
NOT
OBTAINED
1) Pins 1 and 3.
Voltage measured should read
If reading is not within tolerance,
tween
and
just
ADJUST potentiometer on
L T U P S O . I f a d j u s t m e n t d o e s n o t b r i n g
the voltage into tolerance, replace
L T U P S O .
2) Pins 1 and 2.
Voltage measured should read
If reading is not within tolerance,
tween -43 and -53Vdc.
replace -48PS0. If voltage not
present, check
LTUO fuse on
PSU. If fuse is good, replace 48PS0.
3) Pins 1 and 4.
Voltage measured should read
If reading is not within tolerance,
tween
and
replace LTUPSO.
4) Pins 1 and 5.
Voltage measured should read
If reading is not within tolerance,
-11.3 and
replace LTUPSO.
d) On LTU backplane connector
Voltage measured should read
If reading is not within tolerance,
J44 shown in Figure 4.01, take
tween
and
check
cabling between
a reading between pins 1 and
tween basic shelf and LTU
2
or pins 1 and 3.
Repeat steps
a) through d) for ex-
pansion cabinet LTU shelf voltages
(if applicable) substituting
for
48Vdc power supply and appropriate
After satisfactorily completing steps
and
proceed
follows to
measure the loaded LTU shelf input
voltages:
a) On the PSU, place the circuit
breakers designated
LTUPS2
in the off (down) positions.
b) Plug all previously extracted
on the LTU shelves into
their respective backplane
connectors.
c) On the PSU, place the circuit
breakers designated LTUPSO,
and LTUPS2 in the
on (up) positions.
d) Repeat measurements on LTU
Voltages measured should be within
backplane connectors J42,
same tolerances except
J43, and J44 per step
ply should read between 4.85 and
5 . 1 5 V d c .
