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Extracted text from sony cfs 616 s service manual (Ocr-read)
Page 1
CFS-616S
Ð 21 ÐÐ 22 ÐÐ 23 Ð
6-4. SCHEMATIC DIAGRAM Ð TUNER Section Ð
Note on Schematic Diagram:
¥ All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
¥ All resistors are in W and
1/4
W or less unless otherwise
specified.
¥
¢ : internal component.
¥C: panel designation.
¥U: B+ Line.
¥H: adjustment for repair.
¥ Power voltage is dc 9V and fed with regulated dc power
supply from battery terminal.
¥ Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
( ) : MW
< > : SW
¥ Voltages are taken with a VOM (Input impedance 10 MW).
Voltage variations may be noted due to normal produc-
tion tolerances.
¥ Signal path.
F: FM/SW
f: MW
¥ Abbreviation
EA: Saudi Arabia model.
VCO
REGULATOR
FM FRONT-END
AM FRONT-END
MPX
REGULATOR
MONO/STEREO
SELECT
DECORD
AMP
MUTING
AUTO
BLEND TUNING
INDICATOR
AM IF/
DET
FM IF/
DISCRI
RIPPLE
FILTER
BAND-PASS
MUTE
1
27 28 29 30 24 25 26 2122 23 181920 16 17
2 3 4 5 6 7 8 9
PLL LPF1
PILOT DET LPF2
PILOT DET LPF2
ST IND/VCO CHECK
L-CH OUT
VCC R-CH OUT
RIPPLE FILTER
AGC AFC1
10
AGC AFC2
13
FM IF IN
14
AM IF IN
15
BAND SELECT
11
GND
12
TUNE IND
1/2
COUNTER
1/2
COUNTER PD1
PD2
FM/AM FE OUT FM GNDFM RF IN AM RF IN FM RF REG FM OSC AFC AM OSC MUTE FM DISCRI GND
PLL LPF2
MPX REG
VCO
¥ IC Block Diagram
IC1 CXA1238S
Page 2
CFS-616S
Ð 27 ÐÐ 28 ÐÐ 29 ÐÐ 30 Ð
6-6. SCHEMATIC DIAGRAM Ð MAIN Section Ð ¥ See page 31 for IC Block Diagrams.
Note on Schematic Diagram:
¥ All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
¥ All resistors are in W and
1/4
W or less unless otherwise
specified.
¥C: panel designation.
¥U: B+ Line.
¥H: adjustment for repair.
¥ Power voltage is dc 9 V and fed with regulated dc power
supply from battery terminal.
¥ Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : TAPE PLAY
( ) : TAPE REC
¥ Voltages are taken with a VOM (Input impedance 10 MW).
Voltage variations may be noted due to nor mal produc-
tion tolerances.
¥ Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to nor mal produc-
tion tolerances.
¥ Circled numbers refer to waveforms.
¥ Signal path.
F: TUNER
E: TAPE PLAY (DECK A)
d: TAPE PLAY (DECK B)
G: TAPE REC (DECK B)
N: MIC INPUT
Note:The components identified by mark ! or dotted line
with mark ! are critical for safety.
Replace only with part number specified.
¥ Waveforms
Ð MAIN Board Ð
1T301 (REC mode)
10V/DIV, 5 µs/DIV
2T301 (REC mode)
1V/DIV, 5 µs/DIV
45.2 Vp-p
14.4
ms
4.8 Vp-p
14.4
ms