Section II. DIRECT SUPPORT TROUBLESHOOTING AND REPAIRS
2-6.
Maintenance
performing resistance checks with Multimeter TS-
While the headset-microphone is connected to an
352B/U.
associated equipment, and an abnormal condition or
instructions for removal and replacement of the
result (weak or no sound, or distorted sound) is
microphone element, the earphone assembly, and the
observed, refer to the direct support troubleshooting
plug and cord assembly.
chart (para 2-7) and perform the checks and corrective
measures indicated for the symptom observed.
Figure 2-1. Headset-microphone schematic diagram.
2-7.
Troubleshooting Chart
Item
No.
Trouble symptom
Probable trouble
Checks and corrective measures
1
No sound at either
Defective plug and cord assembly .......... Check plug and cord by resistance
earphone, and no
checks at the U-93A/U plug connec-
audio signal from
tor (fig. 2-1, para 2-8). If incorrect,
microphone.
check cord assembly by continuity.
Replace if necessary (para 2-11).
2
No sound in either
a. Defective plug and cord assembly...... a. Perform checks of 1 above.
earphone.
b. Loose solder connections in
b. Check solder connections. Replace
left dome assembly.
plug and cord assembly or re-
solder connections as necessary.
3
No sound in left
a. Defective earphone............................ a. Remove and replace left earphone
earphone.
b. Loose connection at left
b. Tighten loose earphone setscrews.
earphone.
c. Loose solder connection in
left dome assembly.
solder if necessary.
9
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