PHAZOR CLOCK ANGLE INDICATOR LIGHTS DO NOT COME ON (Continued)

5-2.5 PHAZOR CLOCK ANGLE INDICATOR LIGHTS DO NOT COME ON

5-2.6 TRACKING TARGETS NOT VISIBLE OR STROBEX TUBE LAMP DOES NOT FLASH

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM 55-1520-240-T 5-2.5 PHAZOR CLOCK ANGLE INDICATOR LIGHTS DO NOT COME ON (Continued) DISCONNECT PLUG FROM RO- TOR BLADE RECEPTACLE 138J1. CHECK FOR 28 VDC BETWEEN ROTOR BLADE RECEPTACLE 138J1, PIN P (+) AND GROUND. IS 28 VDC PRESENT? TO 0.025 INCH? LOCATE OPEN IN WIRES W673- 39-20, W639-17-22, OR W552- 7-22 BETWEEN BLADE TRACK RECEPTACLE 138J1 AND BLADE TRACK CB138CB1. REPAIR OR RE- PLACE WIRE AS REQUIRED. CHECK FOR GROUND ON RO TOR BLADE RECEPTACLE 138J1. PINS N AND M. IS GROUND PRESENT? LOCATE OPEN IN WIRE W673- GD134A20N OR W673- GD307A20N BETWEEN BLADE TRACK RECEPTACLE 138J1, PIN N AND M AND FUSELAGE GROUND. REPAIR OR REPLACE WIRE AS REQUIRED. CHECK GAP BETWEEN MAG- NETIC PHASE DETECTOR AND INTERRUPTERS. IS GAP 0.015 ADJUST GAP. REFER TO TM 55- 1520-240-23. CHECK RESISTANCE ON BLADE TRACK RECEPTACLE 138J1 BETWEEN PINS E AND A, 8, C, OR D. IS RESISTANCE 900 TO 1100 OHMS PRESENT? CHECK CONTINUITY BETWEEN MAGNETIC PHASE DETECTOR PLUG 138P3, PIN 8 AND BLADE TRACK RECEPTACLE 138J1, PIN E. IS CONTINUITY PRESENT? LOCATE OPEN ON WIRES W639-19-20 BLU OR W673-38- 22 BLU BETWEEN MAGNETIC PHASE DETECTOR PLUG 138P3. AND BLADE TRACK RECEPTACLE 138J1 REPAIR OR REPLACE WIRE AS RE- QUIRED. SET STROBEX MODE SELEC- TOR SW TO A PASS A STEEL SCREWDRIVER BLADE BACK AND FORTH ACROSS THE MAGNETIC PHASE DETECTOR BETWEEN 0.020 TO 0.050 INCHES OVER POLE PIECE. DOES FLASH TUBE FLASH? REPLACE MAGNETIC PHASE DETECTOR. LOCATE OPEN IN WIRES W639- 18-20 RED, W673-37-22 RED, W673-171-22, W673-172-22, W673-173-22, W673-174-22, OR W673-175-22 BETWEEN MAGNETIC PHASE DETECTOR 5-2.5 TROUBLESHOOT BALANCER (TM 55-4920-402-13&P). END OF TASK 5-11

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