Table 5-4. Troubleshooting - Continued

TM 9-4931-378-13&P

Table 5-4. Troubleshooting - Continued

Malfunction

Test or Inspection

Corrective Action

66. PARITY FLR LAMP NOT ILLUMINATED DURING CCA 1A2 FUNCTiONAL CHECK WITH S8 IN VDW,

Step 1. Replace CCA 1A2.

67. DATA WORD DISPLAY (DS12) DOES NOT INDICATE 255 AND DATA WORD LAMPS 7 THROUGH 0

PABS, TAIR,

N O T ILLUMINATED DURING CCA 1A2 FUNCTIONAL CHECK WITH S8 IN

STAT 1 OR STAT 2.

Step 1. Replace CCA 1A2.

68. NO REFERENCE OSCILLATOR VOLTAGE OR FREQUENCY AT TP9 AND TP10 WITH S11 IN REF OSC.

Step 1. Replace CCA 1A3.

69. REFERENCE OSCILLATOR VOLTAGE OR FREQUENCY OUT OF TOLERANCE DURING REFERENCE

Step 1. Adjust reference oscillator circuit in accordance with Chapter 6.

Step 2. Replace CCA 1A3.

70. RESOLVER B1 OR B2 VOLTAGE OVER 0.005 VAC DURING QUADRATURE CHECKS.

Step 1. Check dual-speed drive for backlash.

Replace dual -speed drive.

Step 2. Align resolver in accordance with Chapter 6.

Step 3. Replace resolver.

Step 4. Replace CCA 1A3.

71. NO OSCILLATOR PEAK VOLTAGE AT TP15 AND TP16 WITH S11 IN REF OSC.

Step 1. Replace CCA 1A3.

72. OSCILLATOR PEAK VOLTAGE AT TP15 AND TP16 NOT BETWEEN 9 VDC AND 11 VDC WITH S11 IN

REF OSC.

Step 1. Adjust oscillator peak detection circuits in accordance with Chapter 6.

Step 2. Replace CCA 1A3.

73. NO RESOLVER PEAK VOLTAGE AT TP15 AND TP16 WITH S11 IN SIN α OR COS α .

Step 1. Replace CCA 1A3.

74. RESOLVER PEAK VOLTAGE AT TP15 AND TP16 OUT OF TOLERANCE WITH S11 IN REF OSC.

Step 1. Adjust resolver peak detection circuits in accordance with Chapter 6.

Step 2. Replace CCA 1A3.

75. RESOLVER B1 OR B2 DIAL NOT WITHIN TOLERANCE AT ANY POINT IN PEAK DETECTION CIRCUIT

CHECKS.

Step 1. Check dual-speed drive.

Replace dual-speed drive.

Step 2. Align resolver in accordance with Chapter 6.

Step 3. Replace resolver.

Step 4. Replace CCA 1A3.

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