Sony UWP-V1 Service Manual page 41

8. Frequency Characteristics Check
Equipment and Tools
. DC power supply
DC output voltage : +3.0 ± 0.1Vdc
. DC ammeter
. Audio analyzer
. Modulation analyzer
MEASUREMENT
MEASUREMENT RANGE : ± 40 kHz
HPF
LPF
DE EMPHASIS
. Oscilloscope
. MM-SMA conversion connector
(SONY Part No. J-6402-490-A)
. SMA-BNC conversion connector
(SONY Part No. J-6402-480-A)
Switch and Control Setting
MB-1137 board
Transmission channel
U30 model ; 32-01 channel (578.125 MHz)
U42 model ; 42-01 channel (650.125 MHz)
CE62 model ; Group 00, 63-32 channel (810.000 MHz)
CE67 model ; Group 00, 68-32 channel (850.000 MHz)
KR model ; 60-01 channel (746.125 MHz)
Attenuation setting :
Accumulated time setting : "00 : 00"
n
Take note of the settings before starting the confirmation
work.
After confirmation is completed, return the settings to
the original setting before change.
Connections
. Same as "6. Distortion Ratio Check".
. For connecting the DC power supply, refer to step
"3. Connecting the DC power supply" in Section 2-2-2.
Procedure
1. Connect the audio analyzer (level meter) to the AF-
OUT connector for the modulation analyzer.
2. Set the modulation analyzer.
3. Set the audio analyzer to level meter mode.
4. Input 1 kHz, _60 dBV (_57.8 dBm) signal to the MIC
INPUT connector from audio analyzer (oscillator).
UWP Series
: FM
: 50 Hz
: 15 kHz or 20 kHz
: 50 usec
0 dB
5. Check the indication on the audio analyzer (level meter).
6. Set the SENSITIVITY on the audio analyzer (level
meter) so that the audio analyzer (level meter) reads 0 dB.
7. Switch the oscillation frequency for the audio analyzer
(oscillator) from 1 kHz to 100 Hz.
8. Check that audio analyzer (level meter) reading is _1
± 2 dB.
9. Switch the oscillation frequency for the audio analyzer
(oscillator) from 150 Hz to 15 kHz.
10. Check that the reading for the audio analyzer (level
meter) is +3 ± 2 dB.
9. Tone Signal Adjustment
Equipment and Tools
. DC power supply
DC output voltage : +3.0 ± 0.1Vdc
. DC ammeter
. Frequency counter
. Spectrum analyzer
. Modulation analyzer
. RF adjusting cable (SONY part No. 7-721-052-81)
. MM-SMA conversion connector
(SONY Part No. J-6402-490-A)
. SMA-BNC conversion connector
(SONY Part No. J-6402-480-A)
Switch and Control Setting
MB-1137 board
Transmission channel
U30 model ; 32-01 channel (578.125 MHz)
U42 model ; 42-01 channel (650.125 MHz)
CE62 model ; Group 00, 63-32 channel (810.000 MHz)
CE67 model ; Group 00, 68-32 channel (850.000 MHz)
KR model ; 60-01 channel (746.125 MHz)
Attenuation setting :
Accumulated time setting : "00 : 00"
n
Note down the setting position before the adjustment.
After the Adjustment complete, set the original position.
0 dB
2-21