Table 5-4. Troubleshooting - Continued

TM 9-4931-378-13&P

Table 5-4. Troubleshooting - Continued

Malfunction

Test or Inspection

Corrective Action

Step 2. Set S17 to OUT AFT. Confirm -6 Vdc present between TP9 and TP10.

If present, replace CCA 1A3; if not, proceed to step 3.

Step 3. Set S12 to LAI +15V. Confirm +15 Vdc between TP12 (-) and TP11 (+). Set S12 to LAI -15V.

Confirm -15 Vdc present.

If both voltages are present proceed to step 7. If +15 Vdc is present but not 15 Vdc, proceed to step 6.

If -15 Vdc is present but not +15 Vdc, proceed to step 5. If neither voltage is present, proceed to step 4.

Step 4. Confirm 115 Vac present at PS2 input terminals. (See figure 5-9 and figure FO-1.)

Repair wiring as necessary.

Step 5. Confirm +15 Vdc present at PS2 +15V output terminals. (See figure 5-9 and figure FO-1.)

Replace power supply PS2.

Step 6. Confirm -15 Vdc present at PS2 -15V output terminals. (See figure 5-9 and figure FO-1.)

Replace power supply PS2.

Step 7. Confirm +15 Vdc and -15 Vdc present at all applicable P1 pins. (See paragraph 5-14 and figure FO-1.)

Repair wiring as necessary.

Step 8. Replace CCA 1A3.

36. NO VOLTAGE PRESENT BETWEEN TP9 and TPIO WITH S11 IN -10V.

Set S17 to OUT AFT. Confirm -6 Vdc present.

Step 1. Set S11 to

Step 2. Replace CCA 1A3.

37. VOLTAGE BETWEEN TP9 AND TP10 NOT +9.995 VDC TO +10.005 VDC WITH S11 IN +10V.

Step 1. Confirm voltage out of tolerance.

Step 2. Replace CCA 1A3.

38. VOLTAGE BETWEEN TP9 AND TP10 NOT -9.995 VDC TO -10.005 VDC with S11 IN -10V.

Step 1. Confirm voltage out of tolerance.

Step 2. Replace CCA 1A3.

39. VOLTAGE BETWEEN TP9 AND TP10 NOT 4.90 VDC TO 5.10 VDC WITH S11 IN 5V.

Step 1. Adjust PS1 in accordance with Chapter 6.

Replace power supply PS1,

40. NO VOLTAGE BETWEEN TP11 AND TP12 WITH S12 SET TO LAI +15V.

Step 1. Perform continuity check of wiring to S12. (See paragraph 5-14 and figure FO-1.)

Repair wiring as necessary.

Step 2. Check switch S12.

Replace switch S12.

41. VOLTAGE BETWEEN TP11 AND TP12 NOT +14.80 VDC TO +15.20 VDC WITH S12 IN LAI -15V.

Step 1. Adjust PS2 + 15 Vdc in accordance with Chapter 6.

Step 2. Replace power supply PS2.

42. NO VOLTAGE BETWEEN TP11 AND TP12 WITH S12 SET TO LAI -15V.

Step 1. Perform continuity check of wiring to S12.

Repair wiring as necessary.

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