CDX-C8050X - Sony Car Audio Service Manual (repair manual). Page 29

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29
tuner unit
(TUX201)
DISC IN SW board
DSO board
KEY board
SUB (CD) board
LOAD SW board
SERVO board
MAIN board
LIMIT SW board
SUB board
3-5. CIRCUIT BOARDS LOCATION
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for 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 
 and 
1
/
4
 
W or less unless otherwise
specified.
%
: indicates tolerance.
f
: internal component.
C
: panel designation.
U
: B+ Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
J
: CD
for printed wiring boards:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
a
: Through hole.
• b
: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Note: The components identified by mark 
0
 or dotted line
with mark 
0
 are critical for safety.
Replace only with part number specified.
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A)
parts face are indicated.
• Waveforms
(MODE:PLAY)
1
2
3
Approx. 620mVp-p
IC1  
qf
  (FE)
0V
IC1  
qh
  (RFO)
1.2Vp-p
Approx. 200mVp-p
IC1  
qd
  (TE)
0V
4
5
6
7
8
IC501  
uj
  (LRCK)
IC501  
ul
  (PCMO)
IC501  
ia
  (BCK)
16.89MHz
IC501  
ih
  (XTAI)
10MHz
IC5  
ea
  (X IN)
5Vp-p
5Vp-p
5.7Vp-p
3.8Vp-p
2Vp-p
22.7µsec
474nsec
474nsec
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