TM 11-6130-266-15
c. Use the cross tip screwdriver
troubleshooting. The cover of the power supply must be
(FSN 5120-529-3101) to loosen or tighten Phillips head
removed to gain access to these adjustments.
screws. Use hand screw starter (FSN 5120-832221) to
a. High Voltage Limit Adj Potentiometer A2-R10.
remove loosened Phillips head screws or to hold and
To adjust A2R10, proceed as follows:
start Phillips head screws. Use the magnetic retrieving
(1) Set the 230V-115V selector switch to
Phillips head screws at are not removed with the screws.
115V.
(2) Connect 115-volt ac, 60 Hz power to AC
5-10. Use of Heat Sink
INPUT receptacle J3 using the ac power cord.
Solder transistor leads quickly; whenever wiring permits,
use a heat sink (such as long-nosed pliers) between the
(3) Set the AC circuit breaker to ON. The AC
soldered joint and the transistor. Use approximately the
indicator lamp lights.
same length and dress of transistor leads as used
originally.
(4) Set the DC circuit breaker to ON.
(5) Rotate DC OUTPUT ADJ potentiometer
5-11. Disassembly and Reassembly
R3 fully clockwise.
The steps necessary to disassemble and reassemble
the power supply are obvious, and no special
(6) With no load connected, adjust A2R10
instructions are required. However, certain procedures
until the OUTPUT METER indicates between 32 and 34
and precautions must be observed prior to, and during,
volts.
reassembly.
b. Current Limit Adj Potentiometer A2R15. To
adjust A2R15, proceed as follows:
a. Make sure that all mating machine surfaces are
absolutely clean.
(1) Perform the procedures given in (1)
through (4) above.
b. Use thermal compound (Astrodyne 829) on
(2) Connect DC OUT receptacle J7 to load.
between all semiconductor and mounting surfaces.
(3) While holding the VOLTAGE-CURRENT
switch in the CURRENT position, adjust A2R15 until the
c. Lubricate all rubber seals with clear silicone
OUTPUT METER indicates 27 amperes.
grease. See that the rubber seals have not cracked,
flattened, or deteriorated.
c. Transfer Point Adj Potentiometer A1R9. To
adjust A1R9, proceed as follows:
d. Make sure that no hardware, such as nuts, bolts,
and washers, have fallen inside the power supply.
(1) Set the 230V-115V selector switch to
115V.
e.
Apply the correct amount of
torque to
the
(2) Connect a variable 115-volt ac, 60 Hz
attaching hardware, as indicated below, when installing
power source to AC INPUT receptacle J3 using the ac
the following parts:
Part
(3) Set the AC circuit breaker to ON. The AC
A3CR1
12 in.-lb
and NORM indicator lamps light.
A3CR2
12 in.-lb
(4) Set the DC circuit breaker to ON.
A3CR3
12 in.-lb
A3CR4
25 in.-lb
(5) With no load connected, simultaneously
A3CR5
25 in.-lb
adjust the ac input line voltage and A1R9 until transfer
A3CR6
12 in.-lb
occurs with an input of between 80 and 100 volts ac.
A4Q1
10 ft-lb
This is indicated when the NORM indicator lamp goes
A4Q2
10 ft-lb
out and the EMER indicator lamp lights at 80 volts ac.
At 100 volts ac, the EMER indicator lamp goes out and
the NORM indicator lamp lights.
5-12. Equipment Adjustments
d. Preregulator Voltage Adj Potentiometer A5-R9.
The following adjustments must be performed after
replacing a defective part or as a result of
Change 3 5-9