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SATURN IlE EPABX
Installation Test Procedures
PROCEDURE
c) On the PSU, place the circuit
breaker designated BASIC PS
in the off (down) position.
d) On the PSU, place the circuit
breaker designated BASIC PS
to the on (up) position.
7
Set digital multimeter to appropriate
dc voltage scale for the following
tests.
8 A
To measure the unloaded basic shelf
input voltages, proceed as follows:
a) On basic backplane shown in
Figure 4.00, take reading be-
tween terminal El, E2, E3 or
E4 and ground.
b) On basic backplane connector
J46, shown in Figure 4.00, take
readings beiween pins 2 and 3.
c) Set digital multimeter to ap-
propriate Vat scale and take
reading between pins 1 and 2
of J46.
d ) S e t d i g i t a l m u l t i m e t e r t o a p p r o p r i -
ate Vdc scale and take readings
between the following pins on
basic backplane connector J47
(shown in Figure 4.00):
1) Pins 1 and 3.
2) Pins 2 and 3.
e) On basic backplane connector
J48, shown in Figure 4.00, take
readings between the following
pins:
1) Pins 1 and 4.
2) Pin 2 or 3 and pin 4.
3) Pins 4 and 5.
Table 4.00 Power-Up/Output Voltage
The red LED designated BATTERY
The red BATTERY TEST LED should
be extinguished.
Voltage measured should read be-
tween +4.5 and +5.5
Voltage measured should read bo-
tween -43 and -53Vdc.
Voltage measured should be be-
tween 75 and 100 Vat.
Voltage measured should be be-
tween -4.9 and -5.2Vdc
Voltage measured should be be-
tween -43 and -53Vdc
Voltage measured should read be-
tween -11.3 and -12.7Vdc.
Voltage measured should be be-
tween +11.3
and +12.7Vdc.
Voltage measured should be be-
tween 4.85 and 5.15Vdc.
IF VERIFICATION
IS NOT OBTAINED
If the red LED remains extinguished,
replace the MSM.
If the red LED remains steadily lit,
either the cabinet ac power cord is
not connected to the commercial ac
power receptacle or a local ac pow-
er failure has occurred.
If further troubleshooting information
is
required
during
procedures, refer to SATURN IIE
EPABX
Maintenance
Troubleshooting Practice.
If reading is not within tolerance, ad-
Vdc.
just +5V ADJUST potentiometer on
PSU. If still out-of-tolerance replace
If reading is not within to!erance,
check the -48P-BASIC fuse in PSU.
If fuse is good, replace -48PSO.
If the voltage is not present, check
and replace RGEN fuse or RAC BAS-
IC fuse on PSU. If fuses are good,
r e p l a c e R G E N P C B . I f v o l t a g e s t i l l n o t
present, replace PSU.
If reading is not within tolerance,
replace the PSU.
If reading is not within tolerance,
check the -488 BASIC fuse on PSU.
If the fuse is good, replace -48PS0.
If reading is not within tolerance,
replace the PSU.
If reading is not within tolerance,
replace the PSU.
If reading is not within tolerance,
check that J16 on the rear panel of
the PSU is strapped to the MSM ter-
minal. If the strap is in place, replace
the MSM.
issue 1, May 1986
N O T E
these
testing
and
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