Sony UWP-V1, Service Manual

Page: 56 / 164

2-36
UWP Series
(4) Distortion Ratio Check
Procedure
n
The checking procedures describe that the URX-M2 (to be
adjusted) is installed into the Tuner
[1]
slot on the MB-X6 or
MB-806.
1. Set the URX-M2 and MB-X6/MB-806 as follows :
. URX-M2 Front panel (Tuner
[1]
)
Channel setting :
U30 model ; Group 03, 32-01 channel (578.125 MHz)
U42 model ; Group 03, 44-01 channel (650.125 MHz)
CE62 model ; Group 04, 63-32 channel (810.000 MHz)
CE67 model ; Group 04, 68-32 channel (850.000 MHz)
KR model
; Group 12, 60-01 channel (746.125 MHz)
RF Squelch : OFF (For setting, refer to “Setting the
Squelch OFF mode” on page 2-29)
. MB-X6/MB-806 Rear panel
ATT (ANTENNA A, B) switch : 0 dB
2. Connect the audio analyzer to the TUNER OUTPUT 1
connector via MIC amp.
3. Connect the signal generator to the ANTENNA A IN
connector with DC cut fixture.
4. Set the signal generator as follows :
Signal generator setting
FREQUENCY (carrier frequency) :
U30 model ; 578.125 MHz
U42 model ; 650.125 MHz
CE62 model ; 810.000 MHz
CE67 model ; 850.000 MHz
KR model
; 746.125 MHz
RF OUTPUT (Output level) : 60 dB u V
EMF
(= _ 53 dBm)
MODULATION (Modulation frequency) : 1 kHz
DEVIATION (Frequency deviation)
:
±
36 kHz
5. Set the audio analyzer to the distortion mode, and check
that the distortion ratio is less than 0.8 %.
6. Change the MODULATION (modulation frequency) of
the signal generator as shown below.
MODULATION (modulation frequency) : 10 kHz
Check that the distortion ratio is less than 4 %.
n
10 kHz modulation frequency must be set by using the
function generator.
7. Connect the signal generator to the ANTENNA B IN
connector with DC cut fixture.
8. Perform the procedures 4 to 6 above.
6. Change the MODULATION (modulation frequency) of
the signal generator as follows, and check the output
level of the OUTPUT connector is set also as follows.
n
40 Hz and 18 kHz modulation frequency must be set by
using the function generator.
MODULATION frequency TUNER OUTPUT 1
of signal generator connector output level
40 Hz + 2.0
±
1.0 dB
18 kHz _ 34.0
±
2.5 dB
7. Connect the signal generator to the ANTENNA B IN
connector with DC cut fixture.
8. Perform the procedures 4 to 6.