Sony CDX-GT420U Service Manual page 25

THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
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
(SIDE B) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(SIDE A) the parts face are indicated.
• Indication of transistor.
C
Q These are omitted.
B E
B C E
These are omitted.
E C B
These are omitted.
• Abbreviation
EA : Saudi Arabian model
IND : Indian model
MX : Mexican model
RU : Russian model
CDX-GT420U/GT424U/GT427UE/GT470U/GT470US
For Schematic Diagrams.
Note:
• All capacitors are in μF unless otherwise noted. (p: pF)
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
specifi ed.
• f : internal component.
• C : panel designation.
Note: The components identifi ed by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specifi ed.
• A : B+ Line.
• B : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : AM/MW/LW/SW
< > : CD PLAY
* : Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
J : CD PLAY
F
: FM
f : AM/MW/LW/SW
L : AUX
c
: USB
• Abbreviation
EA : Saudi Arabian model
IND : Indian model
MX : Mexican model
RU : Russian model
• Waveforms
– MAIN Board –
IC501 (XIN)
0.7 Vp-p
32.768 kHz
0.2 V/DIV, 10 μsec/DIV
IC501 (OSC IN)
1.5 Vp-p
11.06 MHz
0.5 V/DIV, 0.1 μsec/DIV
IC50 (XTI)
1.1 Vp-p
8.664 MHz
0.5 V/DIV, 0.1 μsec/DIV
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CDX-GT420U/GT424U/GT427UE/GT470U/GT470US
Ver. 1.1