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Figure 3-5. EGT indicator circuit operation check.		Up
TM-55-4920-244-14 Tester Exhaust Gas Temperature Model BH112JA-36 Manual		Next
Chapter 4. DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS

TM 55-4920-244-14
Table 3-2. Troubleshooting-Continued
Malfunction
Probable cause
Corrective action
2. Power source connected to
a. Lamp burned out.
a. Replace lamp (para. 4-34).
tester, but power on light
b. Defective power inlet cable.
b. Replace power inlet cable.
does not indicate.
3. Switch SW-1 in T/C position;
a. Lamp burned out.
a. Replace lamp (para. 4-33).
no light beam in galvano-
b. Replace power inlet cable.
b. Defective power inlet cable.
meter (GALVO-1).
4. Heater probes will not heat
a. Replace fuse (para. 4-35).
a. Blown fuse (20 amp).
with switch SW-1 in T/C
b. Replace heater cable.
b. Defective heater cable.
c. Check power source and
position.
c. No input voltage.
inlet cable.
a. Replace lamp (para. 4-33).
a. Lamp burned out.
5. Switch SW-1 in E.G.T. po-
b. Replace power inlet cable.
sition; no light beam in
b. Defective power inlet cable.
galvanometers (GALVO-1).
a. Replace fuse (para. 4-35).
6. Heater probes will not heat
a. Blown fuse (20 amp).
b. Defective heater cable.
with switch SW-1 in E.G.T.
b. Replace heater cable.
c. Check power source and
c. No input voltage.
position.
power inlet cable.
a. Make proper connections
a. Improper connections to
7. Galvanometers (GALVO-1)
(para. 2-5 through 2-18).
will not zero with switch
circuit being tested.
b. Replace defective instrument
b. Defective instrument cable
SW-1 in RES. position.
cable or check adapter.
or check adapter.
a. Replace defective instrument
a. Defective instrument cable
8. INSULATION CHECK
cable or check adapter.
or check adapter.
meter will not zero with
input shorted and switch
SW-1 in INSUL. position.
a. Replace lamp (para. 4-33).
a. Lamp burned out.
9. Switch SW-7 in RANGE
b. Replace fuse (para. 4-35).
b. Blown fuse (2 amp).
position; no light beam in
galvanometers (GALVO-2).
a. Replace tube V1 (para 4-36).
a. Defective tube V1.
10. Galvanometers (GALVO-2)
will not zero with switch
SW-7 in RANGE position;
relay (RLY-1) inoperative.
a. Replace tube V1, V2, or V3
a. Defective tube V1, V2, or
11. Galvanometers (GALVO-2)
will not zero with switch
(para. 4-36).
V3.
SW-7 in RANGE position;
relay (RLY-1) operating.
12. R. P. M. CHECK CIRCUIT
a. BH1766 fuse blown out.
a. Replace fuse (13, fig. 4-7).
operative, all other circuits
inoperative.
3-10

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