Pioneer SX-5L Service Manual - Page 7
Browse online or download pdf Service Manual for Receiver Pioneer SX-5L. Pioneer SX-5L 15 pages. Computer controlled stereo receiver
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CIRCUIT DESCRIPTIONS
Outline of Main Stage
The overall composition is outlined in the block diagnms on pp.2-6.
r Tuner Stage
o AM/FM Synthesizer Stage
*MANUAL
: Frequency changed in single steps each time the TUNING UP or DOWN hey is pressed. Frequencies scanned
when pressed continuously,
the scanning being stopped as soon as the hey is released.
*STATION
SCAN : Frequencies scanned. when either TUNING
UP or DOWN key is pressed. Scanning pauses for 5
seconds when a broad.casting station b tuned, and stops altogether if the MEMORY/STOP
key is pressed
within that 5 second period. Otherwise, the scanning is resumed.,
*STATION
SEARCH : Frequencies scanned when either TUNING
UP or DOWN key is pressed, and stopped when a
broadcasting station is tuned.
sx-7
sx-6
sx-5
sx-4
l . D . M O S F E T s i n g l e - s t a g e R F
a m p l i f i e r
p l u s
t w i n
v a r i - c a p
t u n i n g
c i r c u i t
( e q u i v a l e n t t o
4-ganged tuning capacitor) in
F M f r o n t - e n d .
Same as SX-7
J - F E T s i n g l e - s t a g e R F a m p l i f i e r
p l u s t w i n v a r i - c a p t u n i n g c i r c u i t
( e q u i v a l e n t t o 3 { a n g e d t u n i n g
capacitor) in FM front-end.
S a m e a s S X - S
PLL
lC stereo decoder stage
S a m e a s S X - 7
Same as SX-7
Same as SX-7
V a r i - c a p t u n i n g c i r c u i t ( e q u i v a -
l e n t t o 2 - g a n g e d t u n i n g c a p a c i -
t o r l i n A M t u n i n g s t a g e a n d A M
t u n e r l C l L A 1 2 4 7 l .
Same as SX-7
Same as SX-7
Same as SX-7
sx-7
sx-6
sx-5
sx-4
lmproved S/N ratio achieved by
pulse-swallow system for
FM
reception.
S / N r a t i o
8 0 d B ( M o n o )
75dB (Stereol
S a m e a s S X - 7
S / N r a t i o
8 o d 8 ( M o n o l
7 5 d B ( S t e r e o )
Same as SX-7
S / N r a t i o
7 5 d B ( M o n o )
TOdB(Stereo)
Same as SX-7
S / N r a t i o
7 5 d B ( M o n o l
7 0 d B ( S t e r e o )
Frequency memory (presetting)
c a p a b i l i t y f o r u p t o 8 s t a t i o n s i n
each band.
Same as SX-7
Frequency memory (presettingl
capability for up to 6 stations
in each band.
I n m o d e l s i n c l u d i n g t w o A M
b a n d s ( L W a n d M W ) , a n y L W o r
MW frequencies may be stored
i n t h e 6 A M m e m o r i e s .
Same as SX-5
3 tuning modes:
M A N U A L
STATION SCAN
STATION SEARCH
Same as SX-7
2 tuning modes:
M A N U A L
STATION SCAN
only the sTATloN scAN
t u n i n g m o d e i s a v a i l a b l e .