Power Supply; Monochrome Systems - NCR PC4I Technical Reference

SYSTEM OVERVIEW
POWER SUPPLY
Two types of power supply are installed in the NCR
PERSONAl COMPUTER, according to whether the internal
CRT is monochrome or color.
MONOCHROME SYSTEMS
The power supply used in conjunction with a
monochrome CRT has the following characteristics:
•
•
•
•
Primary switched
Fuse in primary
Strappable for the nominal mains supplies of
120 V and 240 V (total permissible range 107 V
to 257 V)
DC outputs (max. power output - 133 W):
+
5
V
+
12
V
5 V
- 12
V
15 A max
5.5 A max
0.3 A max
0.25 A max
• Current limiting and overload protection on DC
outputs. Maximum short circuit current is 3.0 A
on all DC outputs.
1 Power is good after 500 ms at latest
1
Maximum inconsequential supply deviation:
+/-
50
%
for 1/2 cycle once every 10 seconds
Figure 1.13 illustrates connector designations.
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