Maintenance | en
15
Bosch Security Systems, LLC
Customer Maintenance Manual
2020-07 | 01 | F.01U.387.060
5.4
Speaker troubleshooting
Speakers- Airman 8
Do the Speakers
Pass the Talk Test
Are the speaker
wires in good
condition?
Are the solder
points in good
condition?
Did failure occor
in both speakers?
Which Speaker
Faled?
Is the resistance
good?
Did the
PCBA Pass?
Is the overhead
cable in good
condition?
Are the speaker
wires in good
condition?
Are the solder
points in good
condition?
Is the resistance
good?
Did the
PCBA Pass?
Is the PCBA
working?
Is the main
cable in good
condition?
Did Both
Speakers Pass
Sensitivity?
Are the solder
points in good
condition?
Is the continuity
good?
Do the speakers
work?
Speaker Test
Complete
If 600 Ohm unit, the speakers are
wired in series, meaning when
one speaker fails, both fail.
Resistance verification on both
speakers must be done.
Did it Pass?
Physically inspect
the overhead cable
Physically inspect
speaker wires
Resolder the
speaker wires
Replace the
Speaker
Replace the
PCBA
Measure Resistence
of Speaker
Test the PCBA
Replace the
Boom side
Speaker Wires
Resolder the
speaker wires
Replace the
Speaker
Replace the
PCBA
Test Sensitivity
Replace the
Boom side
Speaker Wires
Check the solder
points at the speaker
and at the board
Physically inspect
speaker wires
Replace the
cable
Measure Resistence
of Speaker
Test the PCBA
Check the solder
points at the speaker
and at the board
Physically inspect
the main cable
Test the boom
side PCBA
Replace the
PCBA
Replace the
Cable
Validate the
PCBA
Replace the
speakers
Replace the
PCBA
Resolder the
main cable to
the PCBA
Check Solder Points
on Boom Side PCBA
Replace the
main cable
Measure continuity
from plug to PCBA
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Non-Boom Side
Boom Side
No
No
5.4.1
Speaker sensitivity and frequency response verification
Notice!
This headset was designed, tested, and approved to FAA TSO C139a. The TSO requires the
headset meet the minimum performance specifications as defined in RTCA DO-214a. This
document and specifications listed here reference the test procedures and equipment used
as defined in these standards. Refer to the standard for details on how to perform individual
tests.
All models tested, unless noted otherwise.
Transducer Type:
Dynamic
Transducer:
600Ω
Impedance (at the earphone plug):
Must meet standards outlined in the
specifications table in either the technical
manual or the technical data sheet.
Sensitivity:
Frequency Response:
