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Page Title: SECTION IV. TROUBLESHOOTING
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TM 55-6695-220-13&P f. Thermocouple Test Lead Resistance Checkout. (1)   Connect the Digital Multi-meter or equivalent to the clip leads. (2)   Position the TEMPERATURE SELECTOR SWITCH to the ZERO REFERENCE line on the CHROMEL- ALUMEL sector. (3)   Set the RESISTANCE AND VOLTAGE FUNCTION SWITCH to the following position 2, 8 and 22 OHM in the BENCH TEST sector.  The measured values shall not differ from the stated circuit values by more than ±0.04 ohm. (4)   Repeat steps 1 through 3 using the STANDARDIZING PIN JACK as the measurement point for the 0 OHM AIRPLANE TEST position. SECTION IV.  TROUBLESHOOTING 3-4. GENERAL. 3-8 a. Pyrometer And Thermocouple Tester.  The tester houses the rugged electrical components in a semi-sealed center compartment of the case.  Occasional wiping of the instrument panel, battery compartment interior and test cable compartment interior with a soft cloth will reduce the frequency for intermediate maintenance actions. b. Troubleshooting Chart.  The most frequent apparent malfunctions will be concerned with weak batteries.  The second most frequent servicing will be adjustment of the zero adjust on the VOLTMETER, and third the tightening of a loose knob.  A Wiring Diagram shown in FO-1 (located in back of manual) is also stored in the cover of the tester to identify the rotary action of each of the controls. 3-9. TROUBLESHOOTING CHART. 3-9 Refer to Table 3-7 where corrective actions are listed to help one eliminate the malfunction. 3-11

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