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TUNER SECTION
OdB=1yV
Cautions during repair
When the front end is defective, replace it by a new one
because its internal block 'is difficult to repair.
FM Auto Scan/Stop Level Adjustment
Setting:
"TUNER button (KR-430): FM
FM button (XR-340): FM
antenna
terminal
FM RE Signal
generator
Carrier frequency:
97.9MHz
Output level
: 22dB
(12.6n4)
Mode
1 mono
Modulation
: no modulation
Procedure:
1.
Set to the test mode. (See page 18.)
2.
Push the
TUNER | button
(KR-430)
or | FM | button
(XR-340) and set to FM.
;
Display
3.
Push the preset (3? button.
Display
©
4.
Adjust with the volume RV3 on TU] so that the "FM"
indication
turns
to "FM0"
indication
on
the display
window.
But, in case of already indicated "FM0", turn the RV3 so
that put out light "0" indication and adjustment,
Display
(, _f
SHUFI
_ Specification : Stop sensitivity : 22dB+3dB
Note}
"0" indication of display was align voltage of TP.
(SD).
"TP (SD) voltage 0V "0"
light off
TP (SD) voltage 5V "0" light on
AM Auto Scan/Stop Level Adjustment
ee
Setting :
'
TUNER
button (XR-430): AM
AM button (XR-340): AM
AM
RF signa! .
¢
ci
=) —3
generator
AM dummy
antenna
set
Carrier frequency:
1000kHz
antenna
30% arnplitude
terminal
modulation by
400Hz
signal
Output level
: 33dB (44.72)
Procedure:
;
Pa ee
ee
e e
ee
1.
Set to the test mode. (See page 18.)
2.
Push the | TUNER | button (XR-430)
or | AM | button
(XR-340} and set to AM,
Display
3.-
Push the preset [3] button.
Display
AY
esr,
7,
,wr,
.aa,
et
CTATATA
oe
RAR UA BIA
SHUFA
4,
Adjust with the volume R¥1 on TU1 so that the "AM"
indication
turns to "AMO"
indication
on
the display
window.
But, in case of already indicated "AMU", turn the RV1 so
that put out light "?" indication and adjustment.
Display
SHUF1
Specification : Stop sensitivity : 33¢B+3dB
Note)
"0" indicalion
of display was align voltage of TP
ee
(SD)
TP (SD) voltage 0V "0"
light off
TP (SD) voltage 5V -+"0" light on
S20
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