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SATURN IIE EPABX
Installation Test Procedures
S T E P
PROCEDURE
1) Pins 1 and 3.
2) Pins 1 and 2.
3) Pins 1 and 4.
4) Pins 1 and 5.
d) On LTU backplane connector
J44 shown in Figure 4.01, take
a reading between pins 1 and
2 or pins 1 and 3.
Repeat steps 9A a) through d) for ex-
pansion cabinet LTU shelf voltages
(if applicable) substituting -48PSl for
48Vdc power supply and appropriate
After satisfactorily completing steps
and 96, proceed
measure the loaded LTU shelf input
voltages:
a) On the PSU, place the circuit
breakers designated
in the off (down) positions.
b) Plug all previously extracted
their respective backplane
connectors.
c) On the PSU, place the circuit
breakers designated LTUPSO,
on (up) positions.
d) Repeat measurements on LTU
backplane connectors J42,
J43, and J44 per step 9A.
Power-Up/Output Voliagc?
Voltage measured should read be-
tween +4.5 and +5.5Vdc.
Voltage measured should read be-
tween -43 and -53Vdc.
Voltage measured should read be-
tween +11.3
and +12,7Vdc.
Voltage measured should read be-
Voltage measured should read be-
tween +4.5 and +55Vdc.
follows to
LTUPS2
Voltages measured should be within
same tolerances except +5Vdc sup-
ply should read between 4.85 and
5 . 1 5 V d c .
Test (Continued)
IF VERIFICATION
IS NOT OBTAINED
If reading is not within tolerance, ad-
just +5V 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 .
If reading is not within tolerance,
replace
-48PS0.
present, check -488 LTUO fuse on
PSU. If fuse is good, replace 48PS0.
If reading is not within tolerance,
replace LTUPSO.
If reading is not within tolerance,
replace LTUPSO.
If reading is not within tolerance,
check
cabling
tween basic shelf and LTU
Issue 1, May 1986
If
voltage
not
between be-
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