Pioneer F-7 Series Service Manual page 25

12. ADJUSTMENTS
12.1 FM TUNER SECTION
o Connect the FM signal generator to the FM antcnna 300O terminal through a 300O dummy antenna.
o Place the FM switch to the ON position, MODE switch to the MONO position, TUNING MODE switch
to the MANUAL position, and the REC LEVEL CHECK switch to the OFF position.
a
Step
FM SG (400H2, t75kHz DEV.I
Frequency
displey
Adiustment
point
Adiustmont specif ication
Frequency Level
1
l d l e
87.50MH2
L 1 T V D C b e t r i v e e n t e r m i n a l n o . 1 3 a n d n o . 1 4 ( g r o u n d )
2
l d l e
108.00MH2
TC3 2 5 V D C b e t w e e n l e r m i n a l n o . 1 3 a n d n o . 1 4 ( g r o u n d )
3
Repeat steps 1 and 2 until both specifications are correct.
4
9 O M H z
20dB
9 0 . O 0 M H z
T 1
t t t t t t t t t t t t t t t t t l l t l l l
Adjust until DC roltage between terminal
n o . 1 9 a n d g r o u n d i s m a x i m u m .
t t t t t t t t t t t t l l t t t l t t t t t
5
90MHz
20dB
9 0 . 0 0 M H 2
12
6 1 0 6 M H z 20dB 1O6.O0MHz TCl
7 106MHz 20dB 1O6.OOMHz
Tc2
I Repeat steps 4 through 9 until maximum sensitivity is attained.
I
9 0 M H z
20dB 90.OOMHz
T3
Adjust until DC voltage between terminal
n o . 1 9 a n d g r o u n d i s m a x i m u m .
1 0
l d l e
l l l l t l
9 8 . 0 0 M H 2
t t t t t t
T4.N l l t l t t t t t t t l t t t t l t l l t t t
0 V D C b e t w e e n t e r m i n a l n o . 1 8 a n d n o . l 7 .
t t t t t t t t t t t t t t t t t t t t t t t
1 1
98.0O0MHz* 66dB
TC6
1 2 T4-D
Adiust until distortion at OUTPUT terminal
is minimum.
1 3
Repeat steps 10 through 1 2 until both specifications are correct.
1 4 P l a c e t h e T U N I N G M O D E s w i t c h t o t h e A U T O p o s i t i o n ,
1 5
9 8 M H z
24dB
98.00MH2
V R l
A d j u s t u n t i l m u t i n g c i r c u i t i s f u n c t i o n i n g
at alf levef s below 24d8.
1 6 80dB R 2 9
M a k e c e r t a i n a l l S I G N A L i n d i c a t o r s ( S f o i n t d i s p l a y )
are illuminated abow 80d8. lf not, remove R29.
Frequency must be accurate.