Muting Level And Rf Level Adjustment - Sony WRR-805A Service Manual

Procedure
(1) Connect the audio analyzer to the OUTPUT connector
via MIC amp.
(2) Connect the signal generator to the ANTENNA
connector.
Signal generator setting
FREQUENCY(Carrier frequency)
CE62 model : 806.125 MHz
CE69 model : 858.125 MHz
AU66 model : 799.250 MHz
RF OUTPUT (Output level) : 60 dBuV
MODULATION (Modulation frequency) : 1 kHz
DEVIATION (Frequency deviation) : ± 5 kHz
(3) Adjustment
Specification : OUTPUT connector output level
(level meter indication level)
= _58.0 dBm ± 0.5 dB (at 600 Z loaded)
Adjustment : 1 RV301/RF-93 board (A side)
WRR-805A (CE, AU)
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3-2-3. Muting level and RF level adjustment

Perform this adjustment when the Muting levels deviate
from the specification.
This adjustment is performed automatically by the learning
function of the WRR-805A RSSI learning.
Equipment and Tools
DC power supply: +3.00 Vdc ± 0.02 V
Signal generator
(= _53 dBm) MM-SMA conversion connector (Part No. J-6402-480-A)
EMF
SMA-BNC conversion connector (Part No.J-6402-490-A)
Procedure
(1) Connect the signal generator to the ANTENNA
connector.
(2) Turn OFF the WRR-805A POWER switch (S501).
(3) Set the signal generator as follows :
Signal generator setting
FREQUENCY (Carrier frequency)
RF OUTPUT (Output level) : 15 dBu V
MODULATION (Modulation frequency) :
(4) Short-circuit between TP604 (land) on the MB-861
board and GND (battery "_" terminal) with a jumper
wire as shown figure below.
Sinal
generator
CE62 model; 802.000 MHz
CE69 model; 855.000 MHz
AU66 model; 795.000 MHz
OFF (No modulation)
NM - SMA conversion connector
with SMA - BNC conversion connector
Antenna input (J101)
TP604
( = _98 dBm)
EMF
_
+
MB-861 board (B side)
Jumper wire
MB-861 board (A side)
3-5