Sony UWP-V1, Service Manual

Page: 39 / 164

2-19
UWP Series
4. Connect a modulation analyzer to the antenna terminal
(CN101) via the MM-SMA conversion connector and
the SMA-BNC conversion connector.
5. Adjust
1
RV2 so that the frequency deviation for the mod-
ulation analyzer reading meets the following specification.
Specification : Frequency deviation =
±
39.5 kHz
±
0.5 kHz
Adjustment : 1 RV2/MB-1137 board (A side)
6. Distortion Ratio Check
Equipment and Tools
.
DC power supply
DC output voltage : + 3.0
±
0.1Vdc
.
DC ammeter
. Audio analyzer
.
Modulation analyzer
MEASUREMENT : FM
MEASUREMENT RANGE : AUTO or
±
40 kHz
HPF : 50 Hz
LPF : 15 kHz or 20 kHz
DE EMPHASIS : 50 u sec
.
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 : 0 dB
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.
5. Maximum Frequency Deviation
Adjustment
Equipment and Tools
. DC power supply
DC output voltage :
+
3.0
±
0.1Vdc
. DC ammeter
.
Audio analyzer
. Modulation analyzer
MEASUREMENT : FM
MEASUREMENT RANGE : AUTO or
±
100 kHz
HPF : 50 Hz
LPF : 15 kHz or 20 kHz
DE EMPHASIS : 50
u
sec
. Oscilloscope
.
Adjustor (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 : 0 dB
Accumulated time setting : “00 : 00”
n
Note down the setting position before the adjustment.
After the Adjustment complete, set the original position.
Connections
.
Same as “4. Reference Frequency Division adjustments”.
. For connecting the DC power supply, refer to step
“3. Connecting the DC power supply” in Section 2-2-2.
Procedure
1. Input 1 kHz, _ 20 dBV ( _ 17.8 dBm) signal to the MIC IN-
PUT connector (with Mic input cable). (0 dBV = 1 Vrms)
2. Adjust 1 RV1 so that the frequency deviation for the
modulation analyzer reading meets the following speci-
fication.
Specification : Frequency deviation =
±
34.5 kHz
±
0.5 kHz
Adjustment : 1 RV1/MB-1137 board (A side)
3. Input 1 kHz,
_
10 dBV (
_
7.8 dBm) signal to the MIC IN-
PUT connector (with Mic input cable). (0 dBV = 1 Vrms)