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Assembly Removal /Replacement
STEP 1:
STEP 2:
STEP 3:
STEP 4:
STEP 5:
STEP 6:
5-68
Engineering Setup
The main +5VDC output and the -5.2VDC output do not
require a minimum load for proper regulation. However, the
+/-12VDC outputs require a 20 percent minimum load to
regulate properly. Since those outputs are rated at 10 Amps,
a 20 percent load draws 2 Amps. If you need to adjust the
+/-12VDC outputs, you must connect a 6 ohm (maximum)
25 W (minimum) power resistor across the +12VDC output.
Connect a standard AC mains power source to the AC input
terminals on the power supply. See step 9 in the Power
Supply Assembly Removal /Replacement procedure for AC
terminal connections. This supply is auto ranging, and
accepts any voltage from 90VAC to 264VAC, 47Hz to 63Hz.
There are three multi-turn potentiometers in the supply at the
DC output end. The potentiometer nearest the +5VDC output
terminals (R111) adjusts the +5VDC output. Measure this
output with a DVM and set it for +5.1VDC.
The potentiometer in the center (R56) adjusts the +12VDC
output, and the -12VDC output tracks it. Measure this output
with a DVM across connector J1 pin 5 or 10 (+12) and J1 pin
4 or 9 (+12 return) and set it for 12VDC. (J1 pins 3 and 8 are
the -12 output.)
The potentiometer on the left end (R72) adjusts the -5.2VDC
output. Measure this output with a DVM across connector J1
pin 1 or 6 (-5.2) and J1 pin 2 or 7 (-5.2 return) and set it for
-5.2VDC.
Remove AC mains from the power supply. Remove the load
resistor (if installed) and follow the previous installation
procedure beginning with step 12.
8150 Technical Guide
9100-0212-04 - May 2000
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