Sony WRR-805A, Service Manual

Page: 28 / 54

3-8 WRR-805A (CE, AU)
3-2-5. Distortion Ratio Check
Equipment and Tools Required
Same as “3-2-4. S/N Check”.
Connection
Same as “3-2-4. S/N Check”.
Switch and Control Setting
Same as “3-2-4. S/N Check”.
Procedure
(1) Connect the audio analyzer (with A-weighted filter) to
the OUTPUT connector via MIC amp.
(2) Connect the signal generator to the ANTENNA
connector.
(3) Set the signal generator as follows :
FREQUENCY (Carrier frequency)
CE62 model : 806.125 MHz
CE69 model : 858.125 MHz
AU66 model : 799.250 MHz
RF OUTPUT (Output level) : 60 dB u V
EMF
(= _ 53 dBm)
MODULATION (Modulation frequency) : 1 kHz
DEVIATION (Frequency deviation) :
±
5 kHz
(4) Set the audio analyzer (A-weighted filter : OFF) to the
distortion mode, and check that the distortion ratio is less
than 0.9 % (
_
41 dB or less).
(5) Change the MODULATION (modulation frequency) of
the signal generator as shown below.
MODULATION (modulation frequency) : 10 kHz
(Note : 10 kHz modulation frequency must be set by
using the function generator.)
Check that the distortion ratio is less than 8 %.
(6) Set the channel setting and FREQUENCY (carrier
frequency) of the signal generator as shown
1
and
2
below.
Perform the procedures (1) to (5) above, for each
channel setting (
1
and
2
).
1
Channel setting :
CE62 model : Group 00, 6217 channel (800.125 MHz)
CE69 model : Group 00, 6901 channel (854.125 MHz)
AU66 model : Group 00, 6601 channel (792.250 MHz)
Signal generator setting :
FREQUENCY(Carrier frequency)
CE62 model : 800.125 MHz
CE69 model : 854.125 MHz
AU66 model : 792.250 MHz
2
Channel setting :
CE62 model : Group 00, 6363 channel (813.875 MHz)
CE69 model : Group 00, 6964 channel (862.000 MHz)
AU66 model : Group 00, 6751 channel (805.500 MHz)
Signal generator setting:
FREQUENCY(Carrier frequency)
CE62 model : 813.875 MHz
CE69 model : 862.000 MHz
AU66 model : 805.500 MHz