2-3
WRU-806B
2-2-1. Muting Level and RF Level Adjustment
n
Perform the adjustment with the WRU-806B installed in
the MB-X6.
Perform this adjustment when Muting levels deviate from
the specification.
This adjustment is performed automatically by the learning
function of the WRU-806B RSSI learning.
Preparation
Before the adjustments, turn off the POWER switch of the
MB-X6, and perform the following.
1.
Remove the case cover of the MB-X6.
2.
Remove the upper side case lid of the tuner unit
(WRU-806B to be adjusted), and insert the tuner unit
(WRU-806B) to the Tuner
[1]
slot of the MB-X6.
Equipment and Tools
.
Tuner base unit MB-X6
.
Signal generator
.
DC cut fixture (Refer to “How to make DC cut fixture”.)
Connection
Procedure
Step 1 :
Preparation
Set the signal generator as follows :
Signal generator setting
FREQUENCY (carrier frequency) :
CE38 model ; 607.000 MHz
U30 model
; 567.000 MHz
U42 model
; 639.000 MHz
RF OUTPUT (Output level) : 35 d
u
V
EMF
(=
_
78 dBm)
MODULATION (Modulation frequency) :
OFF (No modulation)
Step 2 :
Adjustment
n
The adjustment procedures describe that the WRU-806B
(to be adjusted) is installed into the Tuner
[1]
slot on the
MB-X6.
(1) Connect the signal generator to the ANTENNA A IN
connector with DC cut fixture.
(2) Turn OFF the MB-X6 POWER switch.
(3) Set the RF OUTPUT (output level) of the signal genera-
tor to the OFF.
(4) While pressing the S601 switch on the RF-155 board
(WRU-806B, Tuner
[1]
), turn on the MB-X6 POWER
switch.
n
Operations in steps 1 and 2 below are also available in-
stead of step (4) above.
1.
Turn on the POWER switch while pressing the
“CH", “+”, and “
_
” buttons on the front panel si-
multaneously.
2.
Press the “CH", “+”, and “
_
” buttons in this order
while all items are displayed on the LCD.
(5) Indication on LCD (WRU-806B, Tuner
[1]
) appears as
follows :
LCD :
(6) Set the RF OUTPUT (output level) of the signal genera-
tor to the ON.
A C1 L
(A C1 L)
A
1
2
3
4
5
6
Signal
generator
DC cut fixture
ANTENNA B IN
MB-X6
Tuner slot
DC cut fixture
ANTENNA A IN
S601
RF-155 board
Tuner unit
(WRU-806B)