Sony WRR-855B, Service Manual, Page: 33 / 84

3-17
WRR-855B
3. Frequency Characteristic Check
Step1: Switch and control setting
Channel setting:
CE21 model; Group 00, 22-32 channel (482.000 MHz)
CE33 model; Group 00, 34-32 channel (578.000 MHz)
CE62 model; Group 00, 63-32 channel (810.000 MHz)
CE67 model; Group 00, 68-32 channel (850.000 MHz)
U14 model; Group 00, 16-01 channel (482.125 MHz)
U30 model; Group 00, 32-01 channel (578.125 MHz)
U42 model; Group 00, 44-01 channel (650.125 MHz)
U62 model; Group 00, 64-01 channel (770.125 MHz)
U66 model; Group 00, 68-01 channel (794.125 MHz)
MUTING: OFF
Step2: Checking
(1) Connect the audio analyzer (level meter) to the AF
OUT (power supply/AF OUT connector) via MIC amp.
(2) Connect the signal generator to the ANT IN A connec-
tor, and set it as follows:
Signal generator setting
FREQUENCY (Carrier frequency):
CE21 model; 482.000 MHz
CE33 model; 578.000 MHz
CE62 model; 810.000 MHz
CE67 model; 850.000 MHz
U14 model;
482.125 MHz
U30 model; 578.125 MHz
U42 model; 650.125 MHz
U62 model; 770.125 MHz
U66 model; 794.125 MHz
RF OUTPUT (Output level): 60 dB
µ
V
EMF
( =
_
53 dBm)
MODULATION (Mmodulation frequency): 1 kHz
DEVIATION (Frequency deviation):
±
12 kHz
(3) Read the output level of the AF OUT (indication of the
audio analyzer). This level is specified to be 0 dB.
(4) Change the MODULATION (modulation frequency)
of the signal generator as follows, and check that the
output level with respect to the output level under the
procedure (2) is set also as follows.
n
10 kHz and 15 kHz modulation frequency must be set
by using the function generator.
Signal generator AF output level
MODULATION frequency
100 Hz
+
1.0
±
1.0 dB
10 kHz
_
20.0
±
1.5 dB
15 kHz _ 26.5
±
2.5 dB
(5) Connect the signal generator to the ANT IN B connec-
tor, and perform the procedures (2), (3) and (4).