IR-200M, IR-300M Y
8
8
ADJUSTMENT PROCEDURE
• Adjustment and Check Method
· IR-200M
(Conditions)
Room temperature
: 15 - 35 °C (59 - 95 °F)
Power source
: 2.4 ± 0.1 V DC
Power switch (SW102)
: ON
Power selector switch (SW101)
: "N" (Normal) position
Channel selector switch (SW100)
: "B" position (Channel B)
Oscillation frequencies of Channels A and B are as follows.
Channel A: 3.100 MHz ± 20 kHz
Channel B: 3.350 MHz ± 20 kHz
Note:
Setting the selector to the positions except “A” and “B” provides no output.
1. VCO check
1-1. Turn on the power switch (SW102) at Channel B.
Confirm that the current consumption is 250 ± 20 mA and LED100 lights green.
1-2. Connect the spectrum analyzer to the RF output (TP200), then confirm that the transmitting
frequency is 3.350 MHz ± 20 kHz and the output level is 90 dB
μ
V or more.
2. Oscillation frequency check
Change the Channel selector switch (SW100) position, and turn OFF the power switch (SW102).
After more than 2 seconds, turn ON the power switch again.
Confirm the following signals are output depending on the selector switch positions.
Channel A position: 3.100 MHz ± 20 kHz
Positions except “A” and “B”: No output
(In this case, also confirm the power indicator alternately flashes green and red.)
3. Maximum frequency deviation adjustment
3-1. Connect the AF generator output of audio analyzer to the AF input (CN300), then apply
1 kHz /-6 dBV signal to the AF input.
3-2. Connect the modulation analyzer to the RF output (TP200), then adjust the AF level control (VR300) for
the frequency deviation of 40 ± 1 kHz. [Filter OFF, (p-p)/2]
3-3. Disconnect the modulation analyzer, and connect the spectrum analyzer to the RF output (TP200) again.
Then, confirm the tone signal (32.768 kHz) level is -32 dBC ± 3 dB.
4. Frequency response check
4-1. Connect the modulation analyzer to the RF output (TP200), and also the AF generator output of audio
analyzer to the AF input (CN300). Then, apply 400 Hz/-40 dBV signal to the AF input.
4-2. Confirm the modulation analyzer reads the following values when setting the audio frequencies to 100 Hz
and 8 kHz keeping the audio input level constant.
100Hz : -5.0±3.0dB
8kHz
: +20.0±1.5dB
4-3. After the measurement above, disconnect the modulation analyzer from the RF output (TP200).
5. RF modulation level adjustment
5-1. Set the Channel selector switch (SW100) to "B" position, and turn OFF the power switch (SW102).
After more than 2 seconds, turn ON the power switch again.
5-2. Connect the oscilloscope to the check point (TP201) of brightness modulation level. Then, adjust the RF
level control (VR1) so that 3.350 MHz signal shows the following values.
DC voltage
: 100 ± 10 mV
Carrier signal level
: 150 mVp-p ± 10 mV
5-3. Connect the oscilloscope to the check point (TP202) of brightness modulation level, and confirm the
following value is obtained.
DC voltage
: 100 ± 10 mV
Carrier signal level
: 150 mVp-p ± 10 mV
5-4. Shift the Power selector switch (SW101) to "H" position, and confirm the following value is obtained at
TP202.
DC voltage
: 100 ± 10 mV
Carrier signal level
: 150 mVp-p ± 10 mV
Current consumption: 340 ± 20 mV
· IR-300M
(Conditions)
Room temperature
: 15 - 35 ºC (59 - 95 ºF)
Power source
: 2.4 ± 0.1 V DC
Power switch (SW300)
: ON
Microphone level control (VR301)
: “H” (Maximum) position
Power selector switch (SW201)
: “N” (Normal) position
Channel selector switch (SW200)
: “B” position (Channel B)
Oscillation frequencies of Channels A and B are as follows.
Channel A: 3.100 MHz ± 20 kHz
Channel B: 3.350 MHz ± 20 kHz
Note:
Setting the selector to the positions except “A” and “B” provides no output.
1. VCO check
1-1. Turn on the power switch (SW300) at Channel B.
Confirm that the current consumption is 250 ± 20 mA and the power switch (SW300) lights green.
1-2. Connect the spectrum analyzer to the RF output (TP201), then confirm that the transmitting frequency is
3.350 MHz ± 20 kHz and the output level is 90 dB
μ
V or more.
2. Oscillation frequency check
Change the Channel selector switch (SW200) position, and turn OFF the power switch (SW300).
After more than 2 seconds, turn ON the power switch again.
Confirm the following signals are output depending on the selector switch positions.
Channel A position: 3.100 MHz ± 20 kHz
Positions except “A” and “B”: No output
(In this case, also confirm the power switch alternately flashes green and red.)
3. Maximum frequency deviation adjustment
3-1. Connect the AF generator output of audio analyzer to the AF input (CN300), then apply 1 kHz /-15 dBV
signal to the AF input.
3-2. Connect the modulation analyzer to the RF output (TP201), then adjust the AF level control (VR300) for
the frequency deviation of 40 ± 1 kHz. [Filter OFF, (p-p)/2]
3-3. Disconnect the modulation analyzer, and connect the spectrum analyzer to the RF output (TP201) again.
Then, confirm the tone signal (32.768 kHz) level is -32 dBC ± 3 dB with the Microphone level control
(VR301) set to "L" (Minimum) position.
4. Frequency response check
4-1. Connect the modulation analyzer to the RF output (TP201), and also the AF generator output of audio
analyzer to the AF input (CN300). Then, apply 400 Hz/-52 dBV signal to the AF input.
4-2. Confirm the modulation analyzer reads the following values when setting the audio frequencies to 100 Hz
and 8 kHz keeping the audio input level constant.
100Hz : -5.0±3.0dB
8kHz
: +20.0±1.5dB
4-3. After the measurement above, disconnect the modulation analyzer from the RF output (TP201).
5. RF modulation level adjustment
5-1. Set the Channel selector switch (SW200) to "B" position, and turn OFF the power switch (SW300).
After more than 2 seconds, turn ON the power switch again.
5-2. Connect the oscilloscope to the check point (TP203) of brightness modulation level. Then, adjust the RF
level control (VR1) so that 4.725 MHz signal shows the following values.
DC voltage
: 100 ± 10 mV
Carrier signal level
: 150 mVp-p ± 10 mV
5-3. Connect the oscilloscope to the check point (TP204) of brightness modulation level, and confirm the fol-
lowing value is obtained.
DC voltage
: 100 ± 10 mV
Carrier signal level
: 150 mVp-p ± 10 mV
5-4. Shift the Power selector switch (SW201) to "H" position, and confirm the following value is obtained at
TP204.
DC voltage
: 100 ± 10 mV
Carrier signal level
: 150 mVp-p ± 10 mV
Current consumption: 340 ± 20 mV
