Siemens SATURN IIE, Installation Test Procedures

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SATURN EPABX
Installation Test Procedures Issue 1, May 1986
4.00 Power-Up/Output Voltage Test (Continued)
S T E P
V E R I F I C A T I O N IF VERIFICATION
IS NOT OBTAINED .
f) Connect positive lead of digital Voltage measured should read + If reading is not 0.05 Vdc, adjust
multimeter to pin 5 of ADJUST potentiometer on PSU. If
tor J48 and negative lead to
adjustment is not effective, replace
terminal El on basic
plane. (Refer to Figure 4.00.)
After satisfactorily completing step
proceed as follows to measure
the loaded basic shelf input voltages.
a) On the PSU, place the circuit The MSM red LED designated
breaker PS TERY TEST should be steadily lit.
in the off (down) position.
b) Plug all previously extracted
on the basic shelf into
their respective backplane
connectors.
c) On the PSU, place the circuit
The MSM red LED designated BAT-
breaker designated BASIC PS TERY TEST should be extinguished.
in the on (up) position.
d) Repeat measuring procedures Same verification as in steps a)
on basic backplane connectors
through e), except that at
J46, J48 and terminals
minal El should read between 4.85
El-E4 as indicated in step and under load.
To measure the unloaded LTU shelf
i n p u t v o l t a g e s ( i f a p p l i c a b l e ) , p r o c e e d
as follows:
a) On the LTU backplane con-
nector in Figure
a reading between
the following pins:
1) Pins 1 and 3.
Voltage measured should be If reading is not within
tween and
just ADJUST potentiometer on
LTUPS. If the adjustment does not
bring voltage into
L T U P S .
2) Pins 3 and 5.
3) Pins 3 and 4.
Voltages measured should be
If reading is not within tolerance,
tween -4.9 and
replace appropriate LTUPS.
Voltage measured should be If reading does not coincide with
tween -43 and -53Vdc.
verification reading, check the
LTU fuse on PSU. If fuse is good,
replace -48PS0.
4) Set digital multimeter to
read and connect be-
tween pins 2 and 3.
V o l t a g e m e a s u r e d s h o u l d b e b e - I f v o l t a g e i s n o t p r e s e n t ,
tween 75 and check/replace RGEN fuse or RAC
LTUO fuse on PSU. If fuses are good,
replace PSU.
b) Set digital multimeter to ap-
propriate Vdc scale.
C
)
On LTU backplane connector
in Figure 4.01, take
a reading between the follow-
ing pins:
4 - 3