TABLE NO. 3-8. Multimeter Does Not Indicate 10.22 6 0.35 Vdc When SCALING AMPL NO. 1 Control Is Turned Fully Counterclockwise And Does Not Indicate -10.22 6 0.35 Vdc When SCALING AMPL NO. 1 Control Is Turned Fully Clockwise

TM 1-6625-735-14

TABLE NO. 3-8. Multimeter Does Not Indicate 10.22 6 0.35 Vdc When SCALING AMPL NO. 1

Control Is Turned Fully Counterclockwise And Does Not Indicate -10.22 6 0.35 Vdc When SCALING

AMPL NO. 1 Control Is Turned Fully Clockwise. (Cont)

TEST OR INSPECTION

CORRECTIVE ACTION

Step 1. If multimeter indication is correct, replace circuit board assembly A1.

Step 2. If multimeter indication is not correct, replace component board assembly A4.

TABLE NO. 3-9. Multimeter Does Not Indicate 10.22 6 0.35 Vdc When SCALING AMPL NO. 2 Con-

trol Is Turned Fully Counterclockwise And Does Not Indicate -10.22 6 0.35 Vdc When SCALING

AMPL NO. 2 Control Is Turned Fully Clockwise.

TEST OR INSPECTION

CORRECTIVE ACTION

1. Place SCALING AMPL NO. 2 control to SIM. Go to 2.

2. Connect multimeter between SCALING AMPL SIM NO. 2 and SIG GND test jacks.

Go to 3.

3. Turn SCALING AMPL NO. 2 control through its range from fully counterclockwise

(DN) to fully clockwise (UP). Multimeter shall indicate 10.22 6 0.35 vdc when SCAL-

ING AMPL NO. 2 control is fully counterclockwise and shall indicate -10.226 0.35

vdc when SCALING AMPL NO. 2 control is fully clockwise. Multimeter shall indicate

a continuously adjust-able voltage from counterclockwise to clockwise position.

Step 1. If multimeter indicates 0.0 vdc, go to 4.

Step 2. If multimeter indication is not correct, go to 5.

Step 3. If multimeter indication changes abruptly from 10.57 to -10.57 vdc, replace

potentiometer R4.

4. Check switch S4 for continuity.

Step 1. If continuity exists, go to 5.

Step 2. If continuity does not exist, replace switch S4.

5. Connect multimeter between terminal 2 of potentiometer R4 and signal ground.

Go to 6.

6. Turn SCALING AMPL NO. 2 control through its range from fully counterclockwise

(DN) to fully clockwise (UP). Multimeter shall indicate -10 and 10 vdc.

Step 1. If multimeter indication is correct, replace circuit board assembly A1.

Step 2. If multimeter indication is not correct, replace component board assembly A4.

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