Siemens SATURN IIE EPABX Installation Test Procedures page 17

SATURN IIE EPABX
Installation Test Procedures
S T E P
f) Connect positive lead of digital
multimeter to pin 5 of connec- 0.05Vdc.
tor J48 and negative lead to
terminal El on basic back-
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
breaker designa?ed
in the off (down) position.
b) Plug all previously extracted
their respective backplane
connectors.
c) On the PSU, place the circuit
breaker designated BASIC PS
in the on (up) position.
d) Repeat measuring procedures
on basic backplane connectors
J46, J47, J48 and terminals
El-E4 as indicated in step 8A.
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 J42,shown in Figure
a reading between
the following pins:
1) Pins 1 and 3.
2) Pins 3 and 5.
3) Pins 3 and 4.
4) Set digital multimeter to
read Vat and connect be-
tween pins 2 and 3.
b) Set digital multimeter to ap-
propriate Vdc scale.
)
On LTU backplane connector
C
a reading between the follow-
ing pins:
4.00 Power-Up/Output Voltage Test (Continued)
V E R I F I C A T I O N
Voltage measured should read +
The MSM red LED designated BAT-
PS TERY TEST should be steadily lit.
The MSM red LED designated BAT-
TERY TEST should be extinguished.
Same verification as in steps 8A a)
through e), except that -t-S!/& at ter-
minal El should read between 4.85
and 5.15Vdc under load.
Voltage measured should be be-
tween +4.5 and +5.5Vdc.
Voltages measured should be be-
tween -4.9 and -5.2Vdc.
Voltage measured should be be-
tween -43 and -53Vdc.
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
tween 75 and 1OOVac.
Issue 1, May 1986
IF VERIFICATION
IS NOT OBTAINED
If reading is not 0.05 Vdc, adjust +5V
ADJUST potentiometer on PSU. If
adjustment is not effective, replace
If reading is not within to!e:ance, ad-
just +5V ADJUST potentiometer on
LTUPS. If the adjustment does not
bring voltage into tolerance,replace
L T U P S .
If reading is not within tolerance,
replace appropriate LTUPS.
If reading does not coincide with
verification reading, check the -48P
LTU fuse on PSU. If fuse is good,
replace -48PS0.
n o t p r e s e n t ,
check/replace RGEN fuse or RAC
LTUO fuse on PSU. If fuses are good,
replace PSU.
.
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