JVC UX-A4 - Tuner Section

UX-A4 B/E/G/GIEN
Mi Tuner Section
Stem Conditions Adjustment & Confirmation Methods Stand. values adjust |
AM IF tadjust and | *Band select *Adjust above mentiioned alligning position, so that
check : MW or AM maximum and symmetrical wave from (See Fig.a}
(Ali version) *Recieving f can be obtained, in this case, the wave peak should
requency appear on the center marker{450kHz) in the scope
:Near the upper | of sweeper.
band edge *On the AM JF circuit, IF filter is solid units, so there
where no signal | is unnecessary for IF tuning.
comes in. ¢in case if tuning may be needed (Repair etc.), do
«Volume control
‘Minimum gain
position.
*Tuner Input
: Positive side to
TP3
«Tuner output
:Positive side to
TP6
:Negative side to
TP7
the above mentioned alignment.
10.7 Miz Fig.b
*Band select @ Remove CF3 so that “ $ ” curve may be changed
FM IF adjust and
check :FM to IF wave from as shown Fig. a.
(All version) *Reciaving Adjust T1 farther more to obtain rmaximum and
frequency balanced wave from .
@ Put back CF3 so that " S ” curve on the scope may
obtain maximum and balanced wave from as
shown Fig.b.
* On the FM circuit, IF filter and discriminator is solid
units so there is unnecessary for iF tuning. In case
IF tuning may be needed (Repair etc.), do that
above mentioned alignment.
* Note for G/GI , E/EN version
@ As to" G/GI", * E/EN ” version, FM JF allignment
is necessary.
@® Receive S8MHz, 22.5 kHz dev. Input level, about
— 3dB limiting sensitivity level.
@ Adjust T1, no farther improvement.
*Volume control
‘Minimum gain
position.
*Tuner input
‘Positive side to
TP5
*Tuner output
‘Positive side to
TP6
:Negative side to
TP7
(No. 1890) 43