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TM-9-1240-216-34 Maintenance Manual M19 and M24 Persicope Download

Page 37 of 176

TM 9-1240-216-34 4-3. POOR FOCUS (ONE OR BOTH EYEPIECES) (SHEET 4 OF 6) REMOVE COVER (1) (VOL II, PARA 4-14) MAKE CHECKS ON SIDE WITH POOR FOCUS USING MULTIMETER, CHECK RESISTANCE OF VARIABLE RESISTOR (2) (JPG). SET METER SCALE TO ‘RX 10,000’. PLACE PROBE WITH BLACK LEAD ON CENTER TERMINAL (3). PLACE PROBE WITH RED LEAD ON TERMINAL WITH WHITE WIRE (1). USING SCREWDRIVER, TURN VARIABLE RESISTOR (2) FULLY COUNTERCLOCKWISE MULTIMETER SHOULD READ INFINITY (00) OHMS. REPLACE VARIABLE RESISTOR (2) (VOL II, PARA 4-31) Para 4-3 (Sheet 4 of 6) 4-9 Vol I