Power Supply Al PS2 Adjustment

TM 11-6625-2937-13

5-11.

WARNING

a. Tools and Test Equipment Required The

Be careful when 115 V ac is applied to the

following tools and test equipment are required for

equipment. Serious injury or DEATH may

adjusting power supply AIPS2.

result from contact with terminals carrying

Test equipment

Common name

this voltage.

Multimeter AN/USM-223

Multimeter

(1) On control-interface unit, set rear panel

Tool Kit, Electronic Equipment TK-105/G

Tool kit

circuit breaker CB I to off (out).

b. Test Setup. Set up the equipment as shown

(2) Remove top access cover (fig. 5-3).

in figure 5-l.

(3) Connect three-phase power (115 V ac, 400

c. Adjustment Procedure.

The following

Hz) to control-interface unit via power cable assembly

procedure should be performed whenever power supply

WI.

AI PS2 (13, fig. 5-3) is replaced, or when the power

(4) Connect multimeter + 28 V between power

supply voltage is determined to be out of tolerance.

supply terminals AIPS3-3(+) and AIPS3-4(-).

Perform the procedure with the power supply installed in

(5) Set rear panel circuit breaker CBI to on (m).

the control-interface unit.

(6) Set front panel POWER ON/OFF switch to

WARNING

ON.

Be careful when 115 V ac is applied to

(7) Set MODE SELECT switch to UNIT TEST,

the equipment. Serious injury or DEATH

DEC position.

may result from contact with terminals

(8) Adjust power supply output voltage

carrying this voltage.

adjustment (ADJ POT) for +28.0 O0.2 V.

(1) On control-interface unit, set rear panel

(9) Set POWER ON/OFF switch to OFF.

circuit breaker CB I to off (out).

(10) Remove multimeter from control-interface

(2) Remove bottom access cover (fig. 5-3).

unit.

(3) Connect three-phase power (115 V ac, 400

(I1) Replace top access cover.

Hz) to control-interface unit via power cable assembly

(12) Disconnect three-phase power cable WI

WI.

from control-interface unit.

(4) Connect multimeter to measure + 15 V

5-13. Repair of Control-Interface Unit

between power supply terminals AIPS2-7(+) and AIPS2-

a. General. Only the standard hand tools

supplied with Tool Kit, Electronic Equipment TK-105/G

(5) Set rear panel circuit breaker CB1 to on

are required to repair the control-interface unit.

Cm).

Disassemble the unit only to the extent necessary to

(6) Set front panel POWER ON/OFF switch to

make repairs. Disassembly and reassembly procedures

ON.

are given in paragraphs 5-14 through 5-20.

(7) Set MODE SELECT switch to POWER OFF.

b. Removal and Replacement of Chassis-

(8) Adjust power supply output voltage

Mounted Parts. Use standard shop practices when

adjustment (ADJ POT) for + 15 iO0.l V.

removing and replacing switches, lamp holders,

(9) Set POWER ON/OFF switch to OFF.

connectors, and other chassis-mounted parts. Refer to

(10)Remove multimeter from control-interface

figure 5-3 for parts locations. When disconnecting

unit.

wiring, tag leads to aid in replacement. Refer to table 5-4

(11)Replace bottom access cover.

for wiring information.

(12)Disconnect three-phase power cable W1

from control-interface unit.

5-14.

Access Cover Removal and Replacement (fig.

5-12. Power Supply Al PS3 Adjustment

5-3)

a. Tools and Test Equipment Required. The

a. Removal. Remove top and bottom access

following tools and test equipment are required for

covers as follows:

adjusting power supply AlPS3.

(1) Remove power from control-interface unit.

Test equipment

Common name

(2) Loosen 16, quarter-turn fasteners (1, fig. 5-

Multimeter AN/USM-223

Multimeter

3) on top access cover (2) and remove cover.

Tool Kit, Electronic Equipment TK-105/G

Tool kit

(3) Carefully invert the control-interface unit to

b. Test Setup. Set up the equipment as shown

gain access to bottom access cover.

in figure 5-l.

(4) Loosen 16, quarter-tun fasteners (1) on

c. Adjustment Procedure.

The following

bottom access cover (17) and remove cover.

procedure should be performed whenever power supply

(5) Return control-interface unit to the normal

AI PS3 (14, fig. 5-3) is replaced, or when the power

operating position.

supply voltage is determined to be out of tolerance.

b. Replacement. Replace both top and bottom

Perform the procedure with the power supply installed in

access covers as follows:

the control-interface unit.

(1) Place control-interface unit on flat surface

and

the

normal

operating

position.

5-11

TM 11-6625-2937-13