Sony WRR-855B, Service Manual, Page: 31 / 84

3-15
WRR-855B
Connection
1. Current Consumption Check
(1) Set the signal generator 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 (Modulation frequency) : 1 kHz
DEVIATION (Frequency deviation )
:
±
5 kHz
(2) Check that the current consumption (DC current meter
indication) is less than 190 mA.
2. S/N 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:
Set the signal generator 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 (Modulation frequency): 1 kHz
DEVIATION (Frequency deviation):
±
5 kHz
Step3:
Checking
(1) Connect the audio analyzer to the AF OUT (power
supply/AF OUTPUT connector) of the D-sub 15 pin
connector via MIC amp.
(2) Connect the signal generator to the ANT IN A connector.
(3) Read the output level of the AF OUT (Audio analyzer
indication level). This level is specified to be 0 dB.
(4) Turn OFF the MODULATION (modulation frequency)
of the signal generator. (No modulation)
(5) Check that the output level of the AF OUT is _ 61 dB or
less (S/N is 61 dB or more with A-weighted filter) as
compared with the level of procedure (3) above.
(6) Change the RF OUTPUT (output level) of the signal
generator as shown below.
RF OUTPUT: 10 dB
µ
V
EMF
( =
_
103 dBm)
(7) Check that the output level of the AF OUT is _ 38 dB or
less (S/N is 38 dB or more with A-weighted filter) as
compared with the level of procedure (3) above.
ANT IN A
+ 7.0 ± 0.1 Vdc
ANT IN B
+
+
_
WRR-855B
Function
generator
Signal
generator
Oscilloscope
Audio
analyzer
Mic amp
DC power supply DC ammeter
Power supply/AF OUT connector
_
as short as possible
(about 20 cm or shorter)