Note For Printed Wiring Boards And Schematic Diagrams; Waveforms; Circuit Boards Location - Sony CDX-F7500 Service Manual

3-5. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

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 diagrams.
Note:
• 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 Ω and 1 / W or less unless otherwise
4
specified.
• f : internal component.
• C : panel designation.
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
• A : B+ Line.
• B : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• CD mechanism section
no mark : CD PLAY
• Main (1/3), (2/3), (3/3) and Key sections
no mark : FM
( ) : AM
< > : CD PLAY
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
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.
J
: CD PLAY
F : FM
f : MW/LW
For printed wiring boards.
Note:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
a : Through hole.
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
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.
C
Q
These are omitted
B E
B E C
These are omitted
E C B
These are omitted

3-6. WAVEFORMS

— Servo Board — (MODE: CD PLAY)
1
5
0V
Approx. 100mVp-p
IC3 wa (TEI) IC3
2 6
0V
Approx. 100mVp-p
IC3 wd (FEI)
IC3
3 7
Approx.
150mVp-p
IC3 wh (A), wk (C)
4
Approx.
150mVp-p
wj (B), wl (D)
IC3

3-7. CIRCUIT BOARDS LOCATION

SENSOR board
KEY board
23 23
— Main Board —
1
Approx.
0.8Vp-p
IC303
ra (RFACO)
2
2Vp-p
16.9344MHz
IC303
uj (XTAO)
3
1Vp-p
18.43MHz
ia (X1) IC550
IC4
SERVO board
tuner unit
(TUX501)
MAIN board
SUB board
CDX-F7500/F7700
2.9Vp-p
32.768kHz
9 (XCOUT)
5Vp-p
6MHz
qa (XOUT)
5Vp-p
4.332MHz
4 (OSCO)