Read Sony CDX-GT270MP / CDX-GT274MP / CDX-GT277ME / CDX-GT320MP Service Manual online
CDX-GT270MP/GT274MP/GT277ME/GT320MP
20
For Schematic Diagrams.
Note:
• All capacitors are in μF unless otherwise noted. (p: pF) 50
• All capacitors are in μF unless otherwise noted. (p: pF) 50
WV or less are not indicated except for electrolytics and
tantalums.
tantalums.
• All resistors are in Ω and 1/4 W or less unless otherwise
specifi ed.
• f : Internal component.
• C : Panel designation.
• C : Panel designation.
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
(In addition to this, the necessary note is printed in each block.)
• A : B+ Line.
• Power voltages is dc 14.4V and fed with regulated dc
• Power voltages is dc 14.4V and fed with regulated dc
power supply from ACC and BATT cords.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : TUNER (FM)
< > : CD PLAY
• Voltages are taken with VOM (Input impedance 10 M
< > : CD PLAY
• Voltages are taken with VOM (Input impedance 10 M
).
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
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F :
F :
AUDIO
f :
TUNER
J :
CD
E :
AUX
• Abbreviation
AR :
AR :
Argentina
model
CND : Canadian model
EA
EA
: Saudi Arabia model
KR
: Korean model
MX
: Mexican model
RU
: Russian model
For Printed Wiring Boards.
Note:
• X : Parts extracted from the component side.
• Y : Parts extracted from the conductor side.
• f : Internal component.
•
• X : Parts extracted from the component side.
• Y : Parts extracted from the conductor side.
• f : Internal component.
•
: Pattern from the side which enables seeing.
(The other layers’ patterns are not indicated.)
• Indication of transistor.
C
B
These are omitted.
E
Q
Caution:
Pattern face side:
(Conductor Side)
Parts face side:
(Component Side)
Pattern face side:
(Conductor Side)
Parts face side:
(Component Side)
Parts on the pattern face side seen
from the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
from the pattern face are indicated.
Parts on the parts face side seen from
the parts face are indicated.
Note: When the MAIN board in this unit is replaced, the destination
setting is necessary. Refer to “NOTE THE MAIN BOARD OR
SYSTEM CONTROLLER (IC501) REPLACING” (page 4).
SYSTEM CONTROLLER (IC501) REPLACING” (page 4).
Note: When the MAIN board in this unit is replaced, the destination
setting is necessary. Refer to “NOTE THE MAIN BOARD OR
SYSTEM CONTROLLER (IC501) REPLACING” (page 4).
SYSTEM CONTROLLER (IC501) REPLACING” (page 4).
• Abbreviation
AR :
AR :
Argentina
model
CND : Canadian model
EA
EA
: Saudi Arabia model
KR
: Korean model
MX
: Mexican model
RU
: Russian model
SECTION 4
DIAGRAMS
Note:
The components identi-
fi
The components identi-
fi
ed by mark 0 or dotted
line with mark 0 are criti-
cal for safety.
Replace only with part
number specifi ed.
cal for safety.
Replace only with part
number specifi ed.
Note:
Les composants identifi és
par une marque 0 sont
critiques pour la sécurité.
Ne les remplacer que par
une pièce portant le nu-
méro spécifi é.
Les composants identifi és
par une marque 0 sont
critiques pour la sécurité.
Ne les remplacer que par
une pièce portant le nu-
méro spécifi é.
• Waveforms
– MAIN Board –
– KEY Board –
2
IC501 qd (OSCOUT)
1 V/DIV, 50 ns/DIV
126.5 ns
3.6 Vp-p
1
IC501 qa (XOUT)
1 V/DIV, 20
Ps/DIV
30.4
Ps
2.6 Vp-p
qa
IC903 rf (OSC)
1 V/DIV, 10
Ps/DIV
26.2
Ps
2.6 Vp-p
Ver. 1.1
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