Circuit Boards Location - Sony CDX-4250 Service Manual

4-2. CIRCUIT BOARDS LOCATION

DISCIN board
tuner assy
(TU01)
DISPLAY board
LOAD board
SUB board
LIMIT board
MAIN board
SERVO board
– 21 –
• Waveforms (MODE:PLAY)
1
0V
Approx. 620mVp-p
1
IC2 (FEO)
2
1.2Vp-p
#¡
IC2 (RFO)
3
0V
Approx. 200mVp-p
$™
IC2 (TEO)
4
2.6Vp-p
7.6µsec
3
(MDP)
IC1
5
5.8Vp-p
22.7µsec
@º
(LRCK)
IC1
6
5.7Vp-p
474nsec
@™
(BCK)
IC1
7
3.2Vp-p
16.89MHz
#¢
IC1 (XTAI)
– 22 –
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 Ω and
1 / W or less unless otherwise
4
specified.
Note: The components identified by mark ! or dotted line
with mark ! are critical for safety.
Replace only with part number specified.
• U : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
no mark : 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