Power Supply Check

TB 9-6625-1914-24

13. Power Supply Check

NOTE

Do not perform power supply check if all other parameters are

within tolerance.

a. Performance Check

(1) Connect TI to extender and connect extender to display section.

(2) Connect multimeter between TI pin 11 of connector XA5 (fig. 3 or fig. 4)

(white/black/red/white) and chassis ground, using adapter and cable (B4 and B12).

(3) Adjust multimeter for dc measurement and slowly vary autotransformer output

between 105 and 125 V ac while observing multimeter. If multimeter does not remain

between +19.9 and +20.1 V dc, perform b (1) below.

(4) Adjust autotransformer for 115 V ac and measure ripple voltage. Multimeter

will indicate less than 0.5 mV ac.

(5) Connect multimeter between TI pin 8 of connector XA5 (fig. 3 or fig 4)

(white/black/violet wire) and chassis ground.

(6) Slowly vary autotransformer output between 105 and 125 V ac while measuring

dc voltage. If multimeter does not remain between -9.99 and -10.01 V ac, perform

b (2) below.

(7) Adjust autotransformer for 115 V ac and measure ripple voltage. Multimeter

will indicate less than 0.5 mV ac.

b. Adjustments

(1) Adjust A5R16 + 20 ADJ (fig. 3 or fig. 4) for a +20.00 V dc indication on multimeter.

(2) Adjust A5R32 -10 V ADJ (fig. 3 or fig. 4) for a -10.00 V dc indication on multimeter.

14. Final Procedure

a. De-energize and disconnect all equipment.

b. Annotate and affix DA label/form in accordance with TB 750-25.