Maintenance | en
13
Bosch Security Systems, LLC
Customer Maintenance Manual
2020-07 | 01 | F.01U.387.060
Test
When performing a talk test, things to be aware of:
–
Note any unusual or unexpected noises, static, and oscillations.
–
Note any distorted audio.
–
Turn ANR on and note noise reduction of fans, ambient noise etc.
–
Turn ANR off and note noise levels return to normal.
–
Verify sound is heard in both ears.
5.3
Microphone troubleshooting
Mic
*ANR is OFF
Does Mic Pass
theTalk Test
Validate continuity
from plug to PCBA
Replace Cord
Visual Inspection
of all internal wires
Is there power
to the PCBA
Are wires
damaged
Replace the
broken wires
Power On
ANR
Test
Sensitivity
See ANR
Troubleshooting
But, the microphone
doesn´t work
Validate Mic
PCBA
Is Mic circuitry
validated
Replace Microphone
Assembly
Does ANR
work
Microphone Test
Complete
Adjust Microphone
Sensitivity
Validate Power
Source
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes
No
No
Yes
Replace
PCBA
Does the Mic
Meet Sensitivity
Specification
5.3.1
Validate continuity from plug to PCBA
To
validate continuity from the plug to the PCBA
, do the following:
1.
Using an Ohmmeter, place one
probe
on the ring terminal of the plug.
2.
Place the
other probe
at J1 on the PCBA.
3.
Record the
measurement
.
4.
Using an Ohmmeter, place
one probe
on the sleeve terminal of the plug.
5.
Place the
other probe
at J2 on the PCBA.
6.
Record the
measurement
.
If the reading is approximately zero, continuity is good.
If any other reading is seen, the continuity is bad. Replace the cable.
