BR200D-U1/BR300D-U1
Service Manual
40
frequency points including ”Lowest”, “Low”, “Mid”, “High” and “Highest” respectively and the number from
0 to 255 for setting max sensitivity of all points.
7.3.9 Receiver Squelch setting
Double-click to enter “SQL9 open” in “Interphone Performance Tuning” Mode and click “Broadband” to
make the frequency of the transmitting signal corresponding to the receiving frequency (level of -116dBm,
modulation signal of 1kHz and frequency offset of 3kHz) showed at each frequency point of the software.
Enter all points including ”Lowest”, “Low”, “Mid”, “High” and “Highest” respectively for automatic
adjustment of software and then press next point after no big change to numbers. After that, adjust
“Narrowband”, the debugging method is the same as that of “Broadband” except the input modulation
signal is changed to frequency of 1kHz and frequency offset of 1.5kHz.
Select “SQL9 open” in “Interphone Performance Tuning” Mode and click “Broadband” to make the
frequency of the transmitting signal corresponding to the receiving frequency (level of -118dBm,
modulation signal of 1kHz and frequency offset of 1.5kHz) showed at each frequency point of the
software. Enter all points including ”Lowest”, “Low”, “Mid”, “High” and “Highest” respectively for
automatic adjustment of software and then press next point after no big change to numbers. After that,
adjust “Narrowband”, the debugging method is the same as that of “Broadband” except the input
modulation signal is changed to frequency of 1kHz and frequency offset of 1.5kHz.
Select “SQL1 open” and “SQL1 close” respectively in “Interphone Performance Tuning” Mode, and
adjust by the same method except the open level of transmitting signal changed to -120dBm and the
close level to -126dBm.
7.4 Receiving Low-voltage Alarm
Adjust power voltage to 6.8V and double-click to enter “Receiving Low Voltage” in “Interphone
Performance Tuning” Mode for automatic detection of the software, and then click “Save” for exit after no
or little variation in numbers.
7.5 Adjusting explanation
Table 3 Voltage controlled oscillator
Item
Test condition
Instrumentation
Test point
Correcting
member
Requirement
Remarks
Setting
Supply voltage battery
terminal:7.4V
DMM
CV
CH: Receiving low
frequency point
TC2
1.0V±0.2V
Adjustment
Locking
voltage
CH: Transmitting high
frequency point
≤
4.0V Observation
Table 4 Receiving part
Item
Test condition
Instrumentation
Test point
Correcting
member
Requirement
Remarks
Summary of Contents for BR200D-U1
Page 1: ...BR200D U1 BR300D U1 Service Manual 1 BR200D U1 BR300D U1 Service Manual ...
Page 17: ...BR200D U1 BR300D U1 Service Manual 17 Exploded View of the Parts ...
Page 20: ...BR200D U1 BR300D U1 Service Manual 20 DR7000 2 ...
Page 36: ...BR200D U1 BR300D U1 Service Manual 36 Chapter 6 PCB Layout ...
Page 37: ...MIC1 C5 D4 D5 D8 C4 C3 R1 D2 D3 D6 C7 C8 C9 J1 D1 D9 C2 D7 C6 C13 C1 ...
Page 70: ...BR200D U1 BR300D U1 Service Manual 66 Chapter 10 Block and Schematic ...
