Pioneer QX-747A F User manual

A-GFIANNE!- STHRHS RHCHgVER
F
< ART-141-0>
,fors)6osMnual
$Jlpnffiruffiffite'

8. ADJUSTMENTS
*Do not attempt to adjust the CD-4 assembly or
RM/SQ assembly. These adjustments require special
test equipment, including a CD-4 signd generator,
SQ encoder and other apparatus.
Required Measuring I nstruments
o FM signal generator
o MPX signal generator
. AM signal generator
o Millivolt meter
o Distortion meter
@x-747A
AM Section
1. Set the AM signal generator at 400H2 3O7o
modulation. Connect the generator output to
the AM antenna terminal through a 1kO
resistor.
2. Connect the oscilloscope and voltmeter in
parallel to TAPE REC jack.
3. Set the signal generator output level at approxi-
mately 30d8. Set signal generator and set dials
to 600kHz.
4. Adjust cores of T7 (tuner assembly) and the
bar antenna for peak output.
5. Set signal generator and set dials to 1,400kH2.
6. Adjust TC5 and TC6 (tuner assembly) for peak
output.
7. Repeat steps (3) through (6) several times to
obtain opti,mum tracking.
tr Dtrtrooo8o
Tuner assembly
A trstrucl Etrsoo@ oo
TCs TC6
AM signal generator
AC Oscilloscope
voltmeter z--\ o
/n n \o
\ V U/.
\__-, o
CO
E
o